installation, operation, and maintenance · 11. standard onyzc 4 ton models. 12. epoxy coil and...

SAFETY WARNINGOnly qualified personnel should install and service the equipment.The installation, starting up, and servicingof heating, ventilating, and air-conditioning equipment can be hazardous and requires specific knowledge andtraining. Improperly installed, adjusted or altered equipment by an unqualified person could result in death orserious injury. When working on the equipment, observe all precautions in the literature and on the tags,stickers, and labels that are attached to the equipment.

Packaged Rooftop Air Conditioners —

Precedent™ with eFlex™Technology

Gas/Electric

3 to 5Tons – 60 Hz

Installation, Operation,

and Maintenance

Model Numbers YZC036EYZC048FYZC060E

RT-SVX46C-ENAugust 2015

Introduction

Read this manual thoroughly before operating or servicingthis unit.

Warnings, Cautions, and Notices

Safety advisories appear throughout this manual asrequired.Your personal safety and the proper operation ofthis machine depend upon the strict observance of theseprecautions.

Important Environmental Concerns

Scientific research has shown that certain man-madechemicals can affect the earth’s naturally occurringstratospheric ozone layer when released to theatmosphere. In particular, several of the identifiedchemicals that may affect the ozone layer are refrigerantsthat contain Chlorine, Fluorine and Carbon (CFCs) andthose containing Hydrogen, Chlorine, Fluorine andCarbon (HCFCs). Not all refrigerants containing thesecompounds have the same potential impact to theenvironment.Trane advocates the responsible handling ofall refrigerants-including industry replacements for CFCssuch as HCFCs and HFCs.

Important Responsible RefrigerantPractices

Trane believes that responsible refrigerant practices areimportant to the environment, our customers, and the airconditioning industry. All technicians who handlerefrigerants must be certified.The Federal Clean Air Act(Section 608) sets forth the requirements for handling,reclaiming, recovering and recycling of certainrefrigerants and the equipment that is used in theseservice procedures. In addition, some states ormunicipalities may have additional requirements thatmust also be adhered to for responsible management ofrefrigerants. Know the applicable laws and follow them.

The three types of advisories are defined as follows:

WARNINGIndicates a potentially hazardoussituation which, if not avoided, couldresult in death or serious injury.

CAUTIONsIndicates a potentially hazardoussituation which, if not avoided, couldresult in minor or moderate injury. Itcould also be used to alert againstunsafe practices.

NOTICE Indicates a situation that could result inequipment or property-damage onlyaccidents.

WARNING

Proper Field Wiring and GroundingRequired!

Failure to follow code could result in death or seriousinjury. All field wiring MUST be performed by qualifiedpersonnel. Improperly installed and grounded fieldwiring poses FIRE and ELECTROCUTION hazards.Toavoid these hazards, you MUST follow requirements forfield wiring installation and grounding as described inNEC and your local/state electrical codes.

WARNING

Personal Protective Equipment (PPE)Required!

Installing/servicing this unit could result in exposure toelectrical, mechanical and chemical hazards.

• Before installing/servicing this unit, technicians

MUST put on all PPE required for the work being

undertaken (Examples; cut resistant gloves/sleeves,

butyl gloves, safety glasses, hard hat/bump cap, fall

protection, electrical PPE and arc flash clothing).

ALWAYS refer to appropriate Material Safety Data

Sheets (MSDS)/Safety Data Sheets (SDS) and OSHA

guidelines for proper PPE.

• When working with or around hazardous chemicals,

ALWAYS refer to the appropriate MSDS/SDS and

OSHA/GHS (Global Harmonized System of

Classification and Labelling of Chemicals) guidelines

for information on allowable personal exposure

levels, proper respiratory protection and handling

instructions.

• If there is a risk of energized electrical contact, arc, or

flash, technicians MUST put on all PPE in accordance

with OSHA, NFPA 70E, or other country-specific

requirements for arc flash protection, PRIOR to

servicing the unit. NEVER PERFORM ANY

SWITCHING, DISCONNECTING, OR VOLTAGE

TESTING WITHOUT PROPER ELECTRICAL PPE AND

ARC FLASH CLOTHING. ENSURE ELECTRICAL

METERS AND EQUIPMENT ARE PROPERLY RATED

FOR INTENDED VOLTAGE.

Failure to follow instructions could result in death orserious injury.

© 2015Trane All rights reserved RT-SVX46C-EN

Introduction

Copyright

This document and the information in it are the property ofTrane, and may not be used or reproduced in whole or inpart without written permission.Trane reserves the rightto revise this publication at any time, and to make changesto its content without obligation to notify any person ofsuch revision or change.

Trademarks

All trademarks referenced in this document are thetrademarks of their respective owners.

Revision History

RT-SVX46C-EN (07 Aug 2015)

• Added MZVAV

RT-SVX46C-EN 3

4 RT-SVX46C-EN

Table of Contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Warnings, Cautions, and Notices . . . . . . . . 2

Copyright . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Model Number Description - 3 to 5 Ton . . . . 5

General Information . . . . . . . . . . . . . . . . . . . . . 7

Unit Inspection . . . . . . . . . . . . . . . . . . . . . . . . 7

Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . 12

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Pre-Installation . . . . . . . . . . . . . . . . . . . . . . . 16

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Foundation . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Roof Curb . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

General Unit Requirements . . . . . . . . . . . . 20

Horizontal Discharge Conversion . . . . . . . 20

TCO-1 Instructions . . . . . . . . . . . . . . . . . . . . 21

Return Air Smoke Detector . . . . . . . . . . . . . 21

Main Electrical Power Requirements . . . . 22

Filter Installation . . . . . . . . . . . . . . . . . . . . . . 24

Field Installed Power Wiring . . . . . . . . . . . 24

Main Unit Power . . . . . . . . . . . . . . . . . . . . . 24

Space Temperature Averaging (ReliaTel™Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Pre-Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Voltage Imbalance . . . . . . . . . . . . . . . . . . . . 30

Electrical Phasing (Three Phase Motors) . 30

Test Modes . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Unit Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Verifying Proper Air Flow . . . . . . . . . . . . . . 33

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Monthly Maintenance . . . . . . . . . . . . . . . . . 37

Annual Maintenance . . . . . . . . . . . . . . . . . . 39

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . 40

ReliaTel™ Control . . . . . . . . . . . . . . . . . . . . 40

System Status Checkout Procedure . . . . . 40

Unit Economizer Control (ECA)Troubleshooting . . . . . . . . . . . . . . . . . . . . . . 44

Unit Wiring Diagrams Numbers . . . . . . . . . . 46

Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . 47

Combination Gas Electric Air Conditioner .47

Model Number Description - 3 to 5Ton

Digit 1 - UnitTypeY DX Cooling, Gas Heat

Digit 2 - EfficiencyZ Ultra High Efficiency

Digit 3 - AirflowC Convertible

Digit 4,5,6 - Nominal GrossCooling Capacity (MBh)036 3Ton048 4Ton060 5Ton

Digit 7 - Major Design SequenceE R-410A RefrigerantF MicrochannelType Condenser

Coils with R-410A Refrigerant11

Digit 8 - Voltage Selection3 208-230/60/34 460/60/3

Digit 9 - Unit ControlsR ReliaTel™ Microprocessor

Digit 10 - Heating Capacity

L Low HeatM Medium HeatH High HeatX Low Heat, Stainless Steel Heat

ExchangerY Medium Heat, Stainless Steel Heat

ExchangerZ High Heat, Stainless Steel Heat

Exchanger

Digit 11 - Minor DesignSequenceA First Sequence

Digit 12,13 - Service Sequence** Factory Assigned

Digit 14 - Fresh Air Selection0 No Fresh AirC Economizer, Dry Bulb 0-100%

without Barometric Relief2D Economizer, Dry Bulb 0-100%

with Barometric Relief2E Economizer, Reference Enthalpy

0-100% without Barometric Relief2F Economizer, Reference Enthalpy

0-100% with Barometric Relief2G Economizer, Comparative

Enthalpy 0-100% withoutBarometric Relief2

H Economizer, ComparativeEnthalpy 0-100% with BarometricRelief2

K Low Leak Economizer withBarometric Relief

M Low Leak Economizer with ReferenceEnthalpy with Barometric Relief

P Low Leak Economizer withComparative Enthalpy withBarometric Relief

Digit 15 - Supply Fan/DriveType/Motor6 Single Zone VAV10

E VAV Supply AirTemperature ControlStandard Motor

Digit 16 - Hinged ServiceAccess/Filters0 Standard Panels/Standard FiltersA Hinged Access Panels/Standard

FiltersB Standard Panels/2” MERV 8 FiltersC Hinged Access Panels/2” MERV 8

FiltersD Standard Panels/2” MERV 13 FiltersE Hinged Access Panels/2” MERV 13

Filters

Digit 17 - Condenser CoilProtection0 Standard Coil1 Standard Coil with Hail Guard2 Black Epoxy Pre-Coated Condenser

Coil12

3 Black Epoxy Pre-CoatedCondenser Coil with Hail Guard12

4 CompleteCoat™ Condenser Coil5 CompleteCoat™ Condenser Coil

with Hail Guard

Digit 18 -Through the BaseProvisions0 NoThrough-the-Base ProvisionsA Through-the-Base Electric3

B Through-the-Base Gas Piping7

C Through-the-Base Electric and GasPiping7

Digit 19 - Disconnect/CircuitBreaker (three-phase only)0 No Disconnect/No Circuit Breaker1 Unit Mounted Non-Fused

Disconnect32 Unit Mounted Circuit Breaker3

Digit 20 - Convenience Outlet0 No Convenience OutletA Unpowered Convenience OutletB Powered Convenience Outlet

(three-phase only)4

Digit 21 - CommunicationsOptions0 No Communications Interface

Digit 22 - Refrigeration SystemOption0 Standard Refrigeration System5

Digit 23 - Refrigeration Controls0 Without Refrigeration Controls1

Digit 24 - Smoke Detector8

0 No Smoke DetectorA Return Air Smoke Detector6

B Supply Air Smoke DetectorC Supply and Return Air Smoke

Detectors6

D Plenum Smoke Detector

Digit 25 - System MonitoringControls14

0 Standard Monitoring System1 Clogged Filter Switch2 Fan Failure Switch4 Clogged Filter Switch and Fan

Failure SwitchA Condensate Drain Pan Overflow

SwitchB Clogged Filter Switch and

Condensate Drain Pan OverflowSwitch

C Fan Failure Switch and CondensateDrain Pan Overflow Switch

E Clogged Filter Switch, Fan FailureSwitch and Condensate Drain PanOverflow Switch

Digit 26 - System MonitoringControls0 No Monitoring ControlsA Demand Control Ventilation (CO2)9,13

B Low Leak Economizer with FDD(Fault Detection & Diagnostics)

C FDD (Fault Detection & Diagnostics)with DCV (Demand ControlVentilation)

Digit 27 - Unit HardwareEnhancements0 No Enhancements1 Stainless Steel Drain Pan

Y Z C 0 3 6 E 3 R Z A * *

1 2 3 4 5 6 7 8 9 10 11 12 13

0=No Electric Heat G=18 kW (1&3 phase)B=6 kW (3 phase) J=23 kW (3 phase)E=12 kW (3 phase)

RT-SVX46C-EN 5

Model Number Description - 3 to 5Ton

Digit 31 - Advanced UnitControls0 Standard Unit Controls1 Human Interface

Model Number Notes

1. Standard on all eFlex™ andeDrive™ units.

2. Economizer with BarometricRelief is for downflow configuredunits only. Order Economizerwithout Barometric Relief forhorizontal configuration.Barometric Relief for horizontalconfigured units must be orderedas field installed accessory.

3. Through the base electricrequired when orderingdisconnect/circuit breakeroptions.

4. Requires use of Disconnect orCircuit Breaker.

5. Standard metering devices areTXVs.

6. The return air smoke detectormay not fit up or work properly onthe Precedent units when used inconjunction with 3rd partyaccessories such as bolt on heatwheels, economizers and powerexhaust. Do not order the returnair smoke detectors when usingthis type of accessory.

7. Includes gas piping and shutoff(field assembly required).

8. Not available with hightemperature duct sensoraccessory.

9. Demand Control VentilationOption includes wiring only.TheCO2 sensor is a field-installedonly option.

10. Discharge AirTemperatureSensor is also standardequipment on units with SingleZone.

11. Standard onYZC 4 ton models.

12. Epoxy coil and epoxy withhailguard option not available forunits with microchannelcondenser coil.

13. Requires selection of 2” pleatedfilters (option B or C) for Digit 16.

14. Discharge Air SensingTube isstandard.

6 RT-SVX46C-EN

General Information

Unit Inspection

As soon as the unit arrives at the job site

• Verify that the nameplate data matches the data on thesales order and bill of lading (including electrical data).

• Verify that the power supply complies with the unitnameplate specifications.

• Visually inspect the exterior of the unit, including theroof, for signs of shipping damage.

If the job site inspection of the unit reveals damage ormaterial shortages, file a claim with the carrierimmediately. Specify the type and extent of the damage onthe “bill of lading” before signing.

• Visually inspect the internal components for shippingdamage as soon as possible after delivery and beforeit is stored. Do not walk on the sheet metal base pans.

• If concealed damage is discovered, notify the carrier’sterminal of damage immediately by phone and bymail. Concealed damage must be reported within 15days.

• Request an immediate joint inspection of the damageby the carrier and the consignee. Do not removedamaged material from the receiving location.Takephotos of the damage, if possible.The owner mustprovide reasonable evidence that the damage did notoccur after delivery.

• Notify the appropriate sales representative beforeinstalling or repairing a damaged unit.

Storage

Take precautions to prevent condensate from forminginside the unit’s electrical compartments and motors if:

1. the unit is stored before it is installed; or,

2. the unit is set on the roof curb, and temporary heat isprovided in the building. Isolate all side panel serviceentrances and base pan openings (e.g., conduit holes,Supply Air and Return Air openings, and flueopenings) from the ambient air until the unit is readyfor start-up.

Note: Do not use the unit’s heater for temporary heatwithout first completing the start-up proceduredetailed under “Unit Start-Up,” p. 33”.

The manufacturer will not assume any responsibility forequipment damage resulting from condensateaccumulation on the unit’s electrical and/or mechanicalcomponents.

Unit Nameplate

A Mylar unit nameplate is located on the unit’s cornersupport next to the filter access panel. It includes the unitmodel number, serial number, electrical characteristics,refrigerant charge, as well as other pertinent unit data.

Compressor Nameplate

The nameplate for the compressors are located on the sideof the compressor.

Microchannel Condenser Barcode ID

Barcode decal used for condenser coil part identificationcan be located on the vertical header and top of coil's inlet/outlet side.

Unit Description

Before shipment, each unit is leak tested, dehydrated,charged with refrigerant and compressor oil, and runtested for proper control operation.

The condenser coils are either aluminum fin, mechanicallybonded to copper tubing or all aluminum microchannel.

Direct-drive, vertical discharge condenser fans areprovided with built-in thermal overload protection.

The ReliaTel™ Control Module is a microelectronic controlsystem that is referred to as “Refrigeration Module”(RTRM).The acronym RTRM is used extensivelythroughout this document when referring to the controlsystem network.

This module through Proportional/Integral controlalgorithms performs specific unit functions that governunit operation in response to zone temperature, supply airtemperature, and/or humidity conditions depending onthe application.The stages of capacity control for theseunits are achieved by starting and stopping thecompressors.

The RTRM is mounted in the control panel and is factorywired to the respective internal components.The RTRMreceives and interprets information from other unitmodules, sensors, remote panels, and customer binarycontacts to satisfy the applicable request for cooling.

Clogged Filter Switch (Optional)

The unit mounted clogged filter switch monitors thepressure differential across the return air filters. It ismounted in the filter section and is connected to theRTOM. A diagnostic SERVICE signal is sent to the remotepanel if the pressure differential across the filters is at least0.5" w.c.The contacts will automatically open when thepressure differential across the filters decreases toapproximately 0.4" w.c.The clogged filter output isenergized when the supply fan is operating and theclogged filter switch has been closed for at least 2 minutes.The system will continue to operate regardless of thestatus of the filter switch.

Note: On units equipped with factory installed MERV 13filters, a clogged filter switch with differentpressure settings will be installed.This switch willclose when the differential pressure is

RT-SVX46C-EN 7

General Information

approximately 0.8' w.c. and open when thedifferential falls to 0.7" w.c.

Compressor Disable (CPR1/2)

This input incorporates the low pressure control (LPC) ofeach refrigeration circuit and can be activated by openinga field supplied contact installed on the LTB.

If this circuit is open before the compressor is started, thecompressor will not be allowed to operate. Anytime thiscircuit is opened for 1 continuous second duringcompressor operation, the compressor for that circuit isimmediately turned “Off”.The compressor will not beallowed to restart for a minimum of 3 minutes should thecontacts close.

If four consecutive open conditions occur during the firstthree minutes of operation, the compressor for that circuitwill be locked out, a diagnostic communicated to theremote panel (if installed), and a manual reset will berequired to restart the compressor.

Compressor/Inverter Protection

The ReliaTel control receives input from the inverter drivefor any errors encountered by the drive (refer to RT-SVD05*-EN and RT-SVD007*-EN for VF-S15 inverter errorcode details). If an error is encountered before thecompressor has run for 3 minutes, ReliaTel beginscounting errors.The drive will automatically reset whenthe error condition clears and ReliaTel will try to start thecompressor again, if a call for cooling remains and 3minutes have passed since the compressor last ran.

If ReliaTel counts 4 such errors within 30 minutes, thesystem will go to manual lock out mode. Refer to RT-SVD05*-EN (forVF-S15 inverters, refer to RT-SVD007*-EN)for potential causes.

Condensate Drain Pan Overflow Switch

(Optional) - ReliaTel™

This input incorporates the Condensate Overflow Switch(COF) mounted on the drain pan and the ReliaTel™Options Module (RTOM). When the condensate levelreaches the trip point for 6 continuous seconds, the RTOMwill shut down all unit functions until the overflowcondition has cleared.The unit will return to normaloperation after 6 continuous seconds with the COF in anon-tripped condition. If the condensate level causes unitshutdown more than 2 times in a 3 days period, the unitwill be locked-out of operation requiring manual reset ofdiagnostic system through Zone Sensor or BuildingAutomation System (BAS). Cycling unit power will alsoclear the fault.

Discharge LineTemp Switch (DLTS)

The DLTS is looped in series with HPC and LPC. It preventscompressor from overheating (over 300 Fº dome temp) incase of indoor fan failure (cooling) or outdoor fan failure(heating).

Duct Mounted Relative Humidity Sensor

(BAYSENS037*)

Field installed, duct mounted humidity sensor is used tocontrol activation of Enhanced Dehumidification and thehot gas reheat dehumidification options. Humidity setpoints can be selected for relative humidity levels between40% and 60% by adjusting the DEHUMID setting on theReliaTel™ Options Module. See Figure 23, p. 26.

Economizer Control Actuator (Optional) -

ReliaTel™ Control

The ECA monitors the mixed air temperature, return airtemperature, minimum position setpoint (local orremote), power exhaust setpoint, CO2 setpoint, CO2, andambient dry bulb/enthalpy sensor or comparativehumidity (return air humidity against ambient humidity)sensors, if selected, to control dampers to an accuracy of+/- 5% of stroke.The actuator is spring returned to theclosed position any time that power is lost to the unit. It iscapable of delivering up to 25 inch pounds of torque andis powered by 24 VAC.

Evaporator Frost Control (Standard)

This input incorporates the Frostat™ control (FOS)mounted in the indoor coil circuit and can be activated byclosing a field supplied contact installed in parallel withthe FOS.

If this circuit is closed before the compressor is started, thecompressor will not be allowed to operate. Anytime thiscircuit is closed for 1 continuous second duringcompressor operation, the compressor for that circuit isimmediately turned “Off”.The compressor will not beallowed to restart for a minimum of 3 minutes should theFOS open.

Frostat™ is standard on single zone VAV products(SZVAV).

High Pressure Control - ReliaTel™ Control

The high pressure controls are wired in series between thecompressor outputs on the RTRM and the compressorcontactor coils. If the high pressure control switch opens,the RTRM senses a lack of current while calling for coolingand locks the compressor out.

If four consecutive open conditions occur during an activecall for cooling, the compressor will be locked out, adiagnostic communicated to ICS™, if applicable, and amanual reset required to restart the compressor. On dualcompressor units only the affected compressor circuit islocked out.

HighTemperature Sensor (BAYFRST001*)

This sensor connects to the RTRM Emergency Stop Inputon the LTB and provides high limit“shutdown” of the unit.The sensor is used to detect high temperatures due to ahigh thermal event in the air conditioning or ventilationducts.The sensor is designed to mount directly to the

8 RT-SVX46C-EN

General Information

sheet metal duct. Each kit contains two sensors.The returnair duct sensor (X1310004001) is set to open at 135ºF.Thesupply air duct sensor (X1310004002) is set to open at240ºF.The control can be reset after the temperature hasbeen lowered approximately 25ºF below the cutoutsetpoint.

Human Interface - 5 Inch ColorTouchscreen (Optional)

Note: For more information, see RT-SVX49*-EN.

The 5 inch color touchscreen human interface provides anintuitive user interface to the rooftop unit that speeds upunit commissioning, shortens unit troubleshooting times,and enhances preventative maintenance measures.Thehuman interface includes several features including:

• Data trending capabilities by means of time seriesgraphs

• Historical alarm messages

• Real-time sensor measurements

• On board system setpoints

• USB port that enables the downloading of componentruntime information as well as trended historicalsensor data

• Customized reports

Low Pressure Control - ReliaTel™ Control

When the LPC is opened for 1 continuous second, thecompressor for that circuit is turned off immediately.Thecompressor will not be allowed to restart for a minimumof 3 minutes.

If four consecutive open conditions occur during an activecall for cooling, the compressor will be locked out, adiagnostic communicated to ICS™, if applicable, and amanual reset required to restart the compressor. On dualcompressor units only the affected compressor circuit islocked out.

Multiple-Zone VAV Control

Multiple-zoneVAV (MZVAV) control shall vary the speed ofthe indoor fan to maintain the duct static pressure at asetpoint. In cooling mode, the compressors shall be cycled(or economizer modulated) to maintain the supply airtemperature (SAT) at the desired setpoint. In heatingmode, the indoor fan shall operate at maximum speedwhenever the heater is operating.

Phase Monitor

This sensor monitors voltage between the 3 conductors ofthe 3 phase power supply.Two LED lights are provided:

• The green light indicates that a balanced 3 phasesupply circuit is properly connected.

• The red light indicates that unit operation has beenprevented.There are two conditions that will preventunit operation:

• The power supply circuit is not balanced with theproper phase sequence of L1, L2, L3 for the 3conductors of a 3 phase circuit.

• The line to line voltage is not between 180 volts and633 volts.

Power Exhaust Control (Optional) - ReliaTel™

The power exhaust fan is started whenever the position ofthe economizer dampers meets or exceed the powerexhaust setpoint when the indoor fan is on.

With the optional ventilation override accessory, thepower exhaust fan is independent of the indoor fan.

The power exhaust setpoint potentiometer is located onthe Reliatel Options Module (RTOM R-40) and must be setwhile the indoor fan is at maximum speed.This is bestdone while in test mode during 100% cooling or in anystage of heat.

Programmable Zone Sensor - (BAYSENS119*)

This 7 day programmable sensor features 2, 3 or 4 periodsfor Occupied or Unoccupied programming per day. If thepower is interrupted, the program is retained inpermanent memory. If power is off for an extended periodof time, only the clock and day may have to be reset.

The Zone Sensor allows selection of 2, 3 or 4 systemmodes (Heat, Cool, Auto, and Off), two fan modes (On andAuto). It has dual temperature selection withprogrammable start time capability.

The occupied cooling set point ranges between 45 and 98º F.The heating set point ranges between 43 and 96ºF.

A liquid crystal display (LCD) displays zone temperature,temperature set points, day of the week, time, andoperational mode symbols.

The Option Menu is used to enable or disable applicablefunctions, i.e.; Morning Warm-up, Economizer minimumposition override during unoccupied status, Fahrenheit orCentigrade, Supply air tempering, Remote zonetemperature sensor, 12/24 hour time display, Smart fan,and Computed recovery.

During an occupied period, an auxiliary relay rated for 1.25amps @ 30 volts AC with one set of single pole doublethrow contacts is activated.

RBCI - ReliaTel™ BACnet Communications

Interface (Optional)

This module is used when the application calls for an openBACnet protocol. It allows the control and monitoring ofthe system through an ICS panel.The module can beordered from the factory or as a kit to be field installed.Follow the installation instructions that ships with each kitwhen field installation is necessary.

Remote Zone Sensor (BAYSENS016*)

This bullet type temperature sensor can be used foroutside air (ambient) sensing, return air temperature

RT-SVX46C-EN 9

General Information

sensing, supply air temperature sensing, remotetemperature sensing (uncovered).Wiring procedures varyaccording to the particular application and equipmentinvolved. Refer to the unit’s wiring diagrams for properconnections.


This electronic sensor features remote zone sensing andtimed override with override cancellation. It is used with aTrane Integrated Comfort™ building managementsystem.


This electronic sensor features single setpoint capabilityand timed override with override cancellation. It is usedwith aTrane Integrated Comfort™ building managementsystem.


This electronic sensor can be used with BAYSENS106*,108*, 110*, 119* Remote Panels.When this sensor is wiredto a BAYSENS119* Remote Panel, wiring must be 18 AWGShieldedTwisted Pair (Belden 8760 or equivalent). Refer tothe specific Remote Panel for wiring details.

RLCI - ReliaTel™ LonTalk® Communication


This module is used when the application calls for anICSTM building management type control system that isLonTalk®™. It allows the control and monitoring of thesystem through an ICS panel.The module can be orderedfrom the factory or ordered as a kit to be field installed.Follow the installation instruction that ships with each kitwhen field installation is necessary.

RTCI - ReliaTel™Trane Communication


This module is used when the application calls for anICSTM building management type control system. Itallows the control and monitoring of the system throughan ICS panel.The module can be ordered as a kit to be fieldinstalled. Follow the installation instruction that ships witheach kit when field installation is necessary.

RTOM - ReliaTel™ Options Module (Standard)

The RTOM monitors the supply fan proving, clogged filter,supply air temperature, exhaust fan setpoint, supply airtempering, Frostat™, smoke detector, andVariable SpeedFan Control (17 Plus units only). Refer to system inputdevices and functions for operation.

Single Zone Variable Air Volume (Standard),

Displacement Ventilation (Optional)

This sensor offers full supply fan modulation across theavailable airflow range. In addition to full supply fanmodulation, the unit controls the discharge air

temperature to a varying discharge air temperaturesetpoint in order to maintain space temperature.

Smoke Detector Sensor (Optional)

This sensor provides high limit“shutdown” of the unit andrequires a manual reset.The sensor is used to detectsmoke in the air conditioning or ventilation ducts.

Note:

• Consult smoke detector manufacturer if daisy chainingis required.

The supply air smoke detector samples supply air.Thereturn and plenum air smoke detectors sample return air.The smoke detectors are designed to shut off the unit ifsmoke is sensed.This function is performed by samplingthe airflow entering the unit at the return air opening.Follow the instructions provided below to assure that theairflow through the unit is sufficient for adequatesampling. Failure to follow these instructions will preventthe smoke detectors from performing its design function.

Airflow through the unit is affected by the amount of dirtand debris accumulated on the indoor coil and filters.Toinsure that airflow through the unit is adequate for propersampling by the return air smoke detector, completeadherence to the maintenance procedures, includingrecommended intervals between filter changes, and coilcleaning is required.

Periodic checks and maintenance procedures must beperformed on the smoke detector to insure that it willfunction properly. For detailed instructions concerningthese checks and procedures, refer to the appropriatesection(s) of the smoke detector Installation andMaintenance Instructions provided with the literaturepackage for this unit.

In order for the supply air smoke detector or return airsmoke detector to properly sense smoke in the supply airstream or return air stream, the air velocity entering thesmoke detector unit must be in accordance withmanufacturers recommended airflow limits.

Status Inputs (4 Wires Optional)

The ZSM can be wired to receive four (4) operating statussignals from the RTRM (HEAT, COOL, SYSTEM “ON”,SERVICE).

Four (4) wires from the RTRM should be connected to theappropriate terminals (7, 8, 9 & 10) on the ZSM.

Supply Fan Failure Input (Optional)

The Fan Failure Switch can be connected to sense indoorfan operation:

FFS (Fan Failure Switch) If air flow through the unit is notproven by the differential pressure switch connected to theRTOM (factory set point 0.07 “w.c.) within 40 secondsnominally, the RTRM will shut off all mechanicaloperations, lock the system out, send a diagnostic to ICS,and the SERVICE output will flash.The system will remain

10 RT-SVX46C-EN

General Information

locked out until a reset is initiated either manually orthrough ICS.

System Input Devices & Functions

The RTRM must have a zone sensor or thermostat input inorder to operate the unit.The flexibility of having severalmode capabilities depends upon the type of zone sensor orthermostat selected to interface with the RTRM.

The descriptions of the following basic Input Devices usedwithin the RTRM network are to acquaint the operator withtheir function as they interface with the various modules.Refer to the unit’s electrical schematic for the specificmodule connections.

The following controls are available from the factory forfield installation.

Wall Mounted Relative Humidity Sensor

(BAYSENS036*)

Field installed, wall mounted humidity sensor is used tocontrol activation of Enhanced Dehumidification and theHot Gas Reheat Dehumidification options. Humidity setpoints can be selected for relative humidity levels between40% and 60% by adjusting the DEHUMID setting on theReliaTel™ Options Module. See Figure 23, p. 26.

Wireless Zone Sensor (BAYSENS050*)

This electronic sensor features five system settings (Auto,Off, Cool, Heat, and Emergency Heat) and with On andAuto fan settings. It is a manual or auto changeover controlwith dual setpoint capability. Other features include atimed override function, lockable system settings, andFahrenheit or Celsius temperature display. Included withthe wireless zone sensor will be a receiver that is to bemounted inside the unit, a mounting bracket, and a wireharness.

Zone Sensor Module (ZSM) (BAYSENS106*)

This electronic sensor features three system switchsettings (Heat, Cool, and Off) and two fan settings (On

and Auto). It is a manual changeover control with singlesetpoint. (Cooling Setpoint Only)

Zone Sensor Module (ZSM) (BAYSENS108*)

This electronic sensor features four system switch settings(Heat, Cool, Auto, and Off) and two fan settings (On andAuto). It is a manual or auto changeover control with dualsetpoint capability. It can be used with a remote zonetemperature sensor BAYSENS077*.

Zone Sensor (BAYSENS110*)

This electronic sensor features four system switch settings(Heat, Cool, Auto, and Off) and two fan settings (On andAuto) with four system status LED’s. It is a manual or autochangeover control with dual setpoint capability. It can beused with a remote zone temperature sensorBAYSENS077*.

RT-SVX46C-EN 11

Unit Dimensions

Figure 1, p. 12 illustrates the minimum operating andservice clearances for either a single or multiple unitinstallation.These clearances are the minimum distancesnecessary to assure adequate serviceability, catalogedunit capacity, and peak operating efficiency.

Providing less than the recommended clearances mayresult in condenser coil starvation, “short-circuiting” ofexhaust and economizer airflows, or recirculation of hotcondenser air.

Figure 1. Typical installation clearances for single & multiple unit applications

Side by SideNote 2 End to End

Note 2, 3

7’0”2134 MM

6’0”1829 MM

3’0”914 MM

Note 1Single Unit

3’0”914 MM

3’0”914 MM

4’0”1219 MM

Note 4

9 1/8”232 MM

12 1/2”318 MM

12”305 MM

16 3/4”426 MM

YZC036E Units YZC048F, YZC060E Units

Notes:

1. For horizontal discharge unit, this measurement is reduced to 1’6” (457 MM) to minimize ductextensions.

2. When equipped with economizeror barometric relief damper, clearancedistance is to be measured from protruding hood instead of base.

3. Clearance is the same if any unitis rotated 180°.

4. Addition clearance required whenbarometric damper or economizeris installed.

12 RT-SVX46C-EN

Unit Dimensions

Figure 2. 3 tons ultra high efficiency

Notes:

1. All dimensions are in inches/millimeters. 2. ½ NPT Gas Connection

Evaporator SectionAccess Panel

AlternateCondensate Drain

3/4 - 14 NPT Dia. Hole

4 1/4”108 MM

69 7/8”1749 MM

42 1/4”1073 MM

23 9/16”598 MM

9 5/8”244 MM

5 5/8”143 MM

44 1/4”1124 MM

7 5/8”194 MM

5 9/16”141 MM

4 1/4”108 MM

1/2 NPT Gas Connection

Control and CompressorAccess Panel

20 1/4”514 MM

Unit Power Wire1 1/8” (29 MM) Dia. Hole

Service Gauge Port Access1 3/8” (35 MM) Dia. Hole

Condenser Coil

Unit Control Wire7/8” (22 MM) Dia. Hole

36 1/4”921 MM

Condenser Fan

Top Panel

Figure 3. 3 tons ultra high efficiency - roof curb

Note: All dimensions are in inches/millimeters.

Clearance 36” (914 MM)



Clearance 36” (914 MM) for Downflow

Clearance 18” (457 MM) for Horizontal

65 13/16”1670 MM

2”51 MM

2”51 MM

40 7/8”1038 MM

41 7/16”1053 MM

14”356 MM

1 3/4”44 MM

37 7/16”951 MM 25 3/16

640 MM

1 3/4”44 MM

14 9/16”370 MM

8 3/8”263 MM

61 13/16”1568 MM 65 3/16”

1656 MM16 3/4”425 MM

17 7/8”479 MM

RETURN

SUPPLY

RT-SVX46C-EN 13

Unit Dimensions

Figure 4. 3 tons ultra high efficiency - unit clearance and roof opening



Clearance fromTop of Unit 72”

Clearance 48” (1219 MM) Clearance 36” (914 MM)

Typical Roof Opening

Clearance Horizontal Flow - 18” (457 MM) Downflow - 36” (914 MM)

37”(940 MM)

44 1/2”(1130 MM)

40 “(1016 MM)68 3/16”

(1732 MM)

Figure 5. 4 to 5 tons ultra high efficiency


Evaporator SectionAccess Panel

Alternate Condensate DrainConnection 3/4 - 14 NPT Dia. Hole

1/2 NPT Gas Connection(80 MBh, 120 MBh)

3/4 NPT Gas Connection(150 MBh, 200 MBh, 250 MBh)

Control and CompressorAccess Panel

Top Panel

Condenser Fan

Condenser Coil

Unit Control Wire7/8” (22 MM) Dia. Hole

Service Gauge Port Access1 3/8” (35 MM) Dia. Hole

Unit Power Wire1 3/8” (35 MM) Dia. Hole

4 1/4”108 MM5 5/8”

143 MM7 5/8”

194 MM53 1/4”

1353 MM

5 5/8”143 MM

9 5/8”244 MM

18 1/2”470 MM

88 5/8”2251 MM

47 7/8”1216 MM

27 5/8”701 MM

4 1/4”108 MM

40 7/8”1038 MM

14 RT-SVX46C-EN

Unit Dimensions

Figure 6. 4 to 5 tons ultra high efficiency - roof curb



Clearance 36” (914 MM) for Downflow

Clearance 18” (457 MM) for Horizontal

Clearance 48” (1219 MM) for DownflowClearance 36” (9

14 MM)

Return

Supply

46 3/8”

(1178 MM)

34 3/8”(873 MM)

14”356 MM

18 1/4”(470 MM)1”(25 MM)

1”(25 MM)1”(25 MM)

6 5/8”(168 MM)

18 1/2”(470 MM)

80 1/2”(2045 MM) 83 7/8”

(2130 MM)

2”51 MM

2”51 MM

1 3/4”44 MM

84 1/2”2146 MM 49 7/8”

1267 MM

50 3/8”1280 MM

34 3/8”873 MM

Figure 7. 4 to 5 tons ultra high efficiency - unit clearance and roof opening




88”(2251 MM)

46”(1168 MM)

46”(1168 MM)

53 1/4”(1352 MM)


Typical Roof Opening

Clearance Horizontal Flow - 18” (457 MM)Downflow 36” (914 MM)

Clearance fromTop of Unit 72”

RT-SVX46C-EN 15

Installation

Pre-Installation

Precautionary Measures

• Avoid breathing fiberglass dust.

• Use a NIOSH approved dust/mist respirator.

• Avoid contact with the skin or eyes.Wear long-sleeved,loose-fitting clothing, gloves, and eye protection.

• Wash clothes separately from other clothing: rinsewasher thoroughly.

• Operations such as sawing, blowing, tear-out, andspraying may generate fiber concentrations requiringadditional respiratory protection. Use the appropriateNIOSH approved respiration in these situations.

First Aid Measures

Eye Contact - Flush eyes with water to remove dust. Ifsymptoms persist, seek medical attention.

Skin Contact -Wash affected areas gently with soap andwarm water after handling.

Procedure

.

WARNING

Fiberglass Wool!

Product contains fiberglass wool. Disturbing theinsulation in this product during installation,maintenance or repair will expose you to airborneparticles of glass wool fibers and ceramic fibers knownto the state of California to cause cancer throughinhalation.You MUST wear all necessary PersonalProtective Equipment (PPE) including gloves, eyeprotection, mask, long sleeves and pants when workingwith products containing fiberglass wool. Exposure toglass wool fibers without all necessary PPE equipmentcould result in cancer, respiratory, skin or eye irritation,which could result in death or serious injury.

WARNING

Heavy Objects!

Ensure that all the lifting equipment used is properlyrated for the weight of the unit being lifted. Each of thecables (chains or slings), hooks, and shackles used tolift the unit must be capable of supporting the entireweight of the unit. Lifting cables (chains or slings) maynot be of the same length. Adjust as necessary for evenunit lift. Other lifting arrangements could causeequipment or property damage. Failure to followinstructions above or properly lift unit could result inunit dropping and possibly crushing operator/technician which could result in death or serious injury.

WARNING

Improper Unit Lift!

Test lift unit approximately 24 inches to verify propercenter of gravity lift point.To avoid dropping of unit,reposition lifting point if unit is not level. Failure toproperly lift unit could result in unit dropping andpossibly crushing operator/technician which couldresult in death or serious injury and possible equipmentor property-only damage.

Figure 8. Corner weightsCenter of Gravity

Length

Center of GravityWidth

Center of Gravity

A B

CD

16 RT-SVX46C-EN

Installation

Table 1. Maximum base unit & corner weights (lbs) and center of gravity dimensions (in.) - gas/electric models

Unit Maximum Base

Model Weights(a) Corner Weights(b) Center of Gravity (in.)

Tons Model No. Shipping Net A B C D Length Width

3 YZC036E 690 615 154 196 73 192 33 19

4 YZC048F 848 753 196 258 126 173 40 23

5 YZC060E 949 854 200 293 121 240 40 23

(a) Weight are approximate for 1st 10 digit model number.(b) Corner weights are given for information only.

Figure 9. Rigging and center of gravity

Attach chain or cable to clevis

Clevis

Center of Gravity Length Center of GravityWidth

A

B

C

D

Table 2. Factory installed options (fiops)/accessory net weights (lbs)(a),(b)

T/YZC036E T/YZC048F, 060E

Net Weight Net Weight

Accessory 3 Tons 4,5 Tons

460V IDM and ODM Transformer(c) 32 39

Barometric Relief 7 10

Coil Guards 12 20

Economizer 26 36

Electric Heaters(d) 15 30

Hinged Doors 10 12

Low Leak Economizer 68 93

Powered Convenience Outlet(e) 38 38

Powered Exhaust 40 40

Roof Curb 61 78

Smoke Detector, Supply 5 5

Smoke Detector, Return 7 7

Stainless Steel Heat Exchanger(f) 4 6

Through the Base Electrical 8 13

Through the Base Gas 5 5

Unit Mounted Circuit Breaker 5 5

Unit Mounted Disconnect 5 5

(a) Weights for options not listed are <5 lbs.(b) Net weight should be added to unit weight when ordering factory-installed accessories.(c) Apply weight with all 460V units.(d) Applicable to Cooling units only.(e) Available for 208/230V units only.(f) Applicable to Gas/Electric units only.

RT-SVX46C-EN 17

Installation

Foundation

Horizontal Units

If the unit is installed at ground level, elevate it above thesnow line. Provide concrete footings at each supportlocation with a “full perimeter” support structure or a slabfoundation for support. Refer to Table 1, p. 17 for the unit’soperating and point loading weights when constructing afooting foundation.

If anchoring is required, anchor the unit to the slab usinghold down bolts or isolators. Isolators should be installedto minimize the transmission of vibrations into thebuilding.

For rooftop applications, ensure the roof is strong enoughto support the combined unit and support structuralweight. Refer to Table 1, p. 17 for the unit operatingweights. If anchoring is required, anchor the unit to theroof with hold-down bolts or isolators.

Check with a roofing contractor for proper waterproofingprocedures.

Ductwork

Figure 10, p. 18 to Figure 11, p. 18 illustrate the supply andreturn air openings as viewed from the rear of the unit.

Figure 12, p. 18 to Figure 13, p. 18 illustrate the supply andreturn air openings in a downflow configuration.

Figure 10. 3 tons ultra high efficiency- Horizontal supply

& return air openings

3 3/16”81 MM

23 14”591 MM

4 3/4”121 MM

RETURN

SUPPLY

14 3/4”375 MM

17 1/4”438 MM

8 7/8”225 MM

13 1/4”337 MM

3/4-14 NPT DIA. HOLECONDENSATE DRAIN

Figure 11. 4, 5 tons ultra high efficiency - horizontal

supply & return air openings

Figure 12. 3 tons ultra high efficiency - downflow supply &

return air openings w/ through-the-base

utilities

Figure 13. 4, 5 tons ultra high efficiency - down flow

supply & return air openings w/ through-the-

base utilities

4 1/4”108 MM

3/4-14 NPT DIA. HOLECONDENSATE DRAIN

SUPPLY19 1/4”489 MM

23 7/8”606 MM

16 3/4”425 MM

27 5/8”701 MM

32 1/4”832 MM

4 3/4”120 MM

3 7/8”98 MM

9 3/8”238 MM

3 5/8”92 MM

14”356 MM

9 1/4”235 MM

15 1/2”394 MM

4”102 MM

24”610 MM

4 3/16”106 MM

23 1/2”597 MM

TBU CONDENSATE

RETURN

SUPPLY

18”457 MM

THROUGHTHE BASE

ELECTRICAL

4 7/8”124 MM

9 15/16” 253 MM

5 1/16”128 MM

2 13/16”71 MM

3 11/16”94 MM

6 1/2”165 MM

THROUGH THE BASE GAS

(Y_C Models Only)

27 9/16”701 MM

4 9/16”116 MM

4 1/8”104 MM

27 5/8”701 MM

4 5/8”119 MM

3 5/8”92 MM

17 1/2”444 MM

9 7/8”251 MM

17 1/2”444 MM

33”838 MM

32 1/8”816 MM

RETURN SUPPLY

THROUGH THEBASE CONDENSATE

4”102 MM

40 3/4”1035 MM

5 7/8”149 MM

10 7/8”276 MM

5”127 MM

3 3/4”95 MM

2 3/4”71 MM 6 1/2”

165 MM

THROUGH THEBASE ELECTRICALTHROUGH THE

BASE GAS

18 RT-SVX46C-EN

Installation

Elbows with turning vanes or splitters are recommendedto minimize air noise due to turbulence and to reduce staticpressure.

When attaching the ductwork to the unit, provide a watertight flexible connector at the unit to prevent operatingsounds from transmitting through the ductwork.

All outdoor ductwork between the unit and the structureshould be weather proofed after installation is completed.

Roof Curb

Downflow

The roof curbs for these units consists of a“full perimeter”enclosure to support the unit just inside of the unit baserail.

Before installing any roof curb, verify;

• it is the correct curb for the unit,

• it includes the necessary gaskets and hardware,

• the purposed installation location provides therequired clearance for proper operation,

• the curb is level and square and the top surface of thecurb must be true to assure an adequate curb-to-unitseal.

Verify that appropriate materials were used in theconstruction of roof and ductwork. Combustible materialsshould not be used in the construction of ductwork or roofcurb that is in close proximity to heater elements or anyhot surface. Any combustible material on the inside of theunit base should be removed and replaced withappropriate material.

Step-by-step curb assembly and installation instructionsship with each accessory roof curb kit. Follow theinstructions carefully to assure proper fit-up when the unitis set into place.

Note: To assure proper condensate flow duringoperation, as well as proper operation of thecondensate overflow switch (if equipped), the unitand curb must be level.

If the unit is elevated, a field constructed catwalk aroundthe unit is strongly recommended to provide easy accessfor unit maintenance and service.

Recommendations for installing the supply air and returnair ductwork joining the roof curb are included in the curbinstruction booklet. Curb ductwork must be fabricated andinstalled by the installing contractor before the unit is setinto place.

Note: For sound consideration, cut only the holes in theroof deck for the ductwork penetrations. Do not cutout the entire roof deck within the curb perimeter.

If a curb accessory kit is not used:

• The ductwork can be attached directly to the factory-provided flanges around the unit’s supply and returnair openings. Be sure to use flexible duct connectionsat the unit.

• For “built-up” curbs supplied by others, gaskets mustbe installed around the curb perimeter flange and thesupply and return air opening flanges.

Rigging

A Rigging illustration and Center-of-Gravity dimensionaldata table is shown in Figure 9, p. 17. Refer to the typicalunit operating weights table before proceeding.

1. Remove all drill screws fastening wood protection tometal base rail. Remove all screws securing woodenprotection to wooden top crate.

2. Remove wooden top crate.

3. Rig the unit as shown in Figure 9, p. 17. Attachadequate strength lifting slings to all four liftingbrackets in the unit base rail. Do not use cables, chains,or slings except as shown.

4. Install a lifting bar, as shown in Figure 9, p. 17, toprotect the unit and to facilitate a uniform lift.Theminimum distance between the lifting hook and thetop of the unit should be 7 feet.

5. Test-lift the unit to ensure it is properly rigged andbalanced, make any necessary rigging adjustments.

WARNING

Combustible Materials!

Maintain proper clearance between the unit heatexchanger, vent surfaces and combustible materials.Refer to unit nameplate and installation instructions forproper clearances. Improper clearances could result incombustible materials catching on fire. Failure tomaintain proper clearances could result in death orserious injury or property damage.

WARNING

Heavy Objects!

Ensure that all the lifting equipment used is properlyrated for the weight of the unit being lifted. Each of thecables (chains or slings), hooks, and shackles used to liftthe unit must be capable of supporting the entireweight of the unit. Lifting cables (chains or slings) maynot be of the same length. Adjust as necessary for evenunit lift. Other lifting arrangements could causeequipment or property damage. Failure to followinstructions above or properly lift unit could result inunit dropping and possibly crushing operator/technician which could result in death or serious injury.

RT-SVX46C-EN 19

Installation

6. Lift the unit enough to allow the removal of base forkpocket protection components as shown in thefollowing figure.

7. Down flow units; align the base rail of the unit with thecurb rail while lowering the unit onto the curb. Makesure that the gasket on the curb is not damaged whilepositioning the unit.

General Unit Requirements

The checklist listed below is a summary of the stepsrequired to successfully install a commercial unit.Thischecklist is intended to acquaint the installing personnelwith what is required in the installation process. It does notreplace the detailed instructions called out in theapplicable sections of this manual.

• Check the unit for shipping damage and materialshortage; file a freight claim and notify appropriatesales representative.

• Verify correct model, options and voltage from unitnameplate.

• Verify that the installation location of the unit willprovide the required clearance for proper operation.

• If applicable, assemble and install the roof curb. Referto the latest edition of the curb installers guide thatships with each curb kit.

• Fabricate and install ductwork; secure ductwork tocurb.

• If applicable, install pitch pocket for power supplythrough building roof.

• Rigging the unit.

• Set the unit onto the curb; check for levelness.

• Ensure unit-to-curb seal is tight and without buckles orcracks.

• Install and connect a condensate drain line to theevaporator drain connection.

Note: Condensate Overflow Switch (if equipped) will notwork if unit is not leveled properly.

Factory Installed Economizer

• Ensure the economizer has been pulled out into theoperating position. Refer to the economizer installersguide for proper position and setup.

• Install all access panels.

Temperature Limit Switch Usage for GasHeat Units

Units are factory shipped in the down flow dischargeconfiguration but can be field converted to a horizontaldischarge configuration. Some, but not all units require adifferentTCO1 limit switch, which is attached to thecombustion blower motor if horizontal dischargeconfiguration is used.

Note: The following units require a limit switch changeout for horizontal discharge.The additional limitswitch is shipped attached to the combustionblower housing:YZC036E**(M,Y),YZC048F**(L,X)direct drive ID motor.

If any of the aforementioned units are installed in the downflow discharge configuration, remove the additionalTCO1limit switch from the combustion blower motor anddiscard.

Horizontal Discharge Conversion

Note: 3 ton unit supply cover to supply opening andreturn cover to return opening. 4 and 5 ton unitreturn cover to supply opening and supply cover toreturn opening.

Supplies needed by installer for conversion: 3 oz. tube ofhigh temperature RTV sealant. (500°F / 260°C: similar toDow Corning 736)

Important: Failure to use recommended sealant couldresult in unit performance loss.

If a unit is to be converted to a horizontal discharge, thefollowing conversion must be performed:

1. Remove RETURN and SUPPLY duct covers.

Figure 14. Fork pockets - all units

Remove 2Fork LiftBrackets

Remove 2 Metal Runnersand 3 Wooden Boards

Table 3. TC01 tripping values

Unit Model TCO1 Tripping Values -Downflow/ Horizontal

YZC036E**(L,X) 190F°

YZC036E**(M,Y) 170°F /220°F

YZC036E**(H,Z) 220°F

YZC048F**(L,X) 145°F /155°F

YZC048F**(M,Y) 170°F

YZC048F**(H,Z) 220°F

YZC060E**(L,X) 140°F

YZC060E**(M,Y) 170°F

YZC060E**(H,Z) 170°F

20 RT-SVX46C-EN

Installation

2. Apply ¼ in. (6mm.) continuous bead of 500°F RTVsealant to the flange of the duct cover to be installed inthe supply opening of the base pan.

Note: Perform the same task for the 3 ton duct cover to beinstalled in the return opening.

3. For the 3 ton unit, slide duct cover with insulation sideup into duct openings until inward edge of duct coverengages with the 2 retaining clips on the duct flanges.Secure the outward edge of each duct cover with 2screws.

4. For the 4 and 5 ton units, slide RETURN DUCT COVER(insulation side up) into supply opening until inwardedge of duct cover engages with the 2 retaining clipson the duct flange. Secure outward edge of the ductcover with two screws. Place the supply duct coverover the return opening (insulation side down). Securethe cover with 4 screws using the dimples on the topsurface to initiate screw engagement.

5. After completing installation of the duct covers forhorizontal discharge, proceed toTCO-1 instructions.

TCO-1 Instructions

If the unit being installed is listed in the following list, thelimit controlTCO1 must be replaced with the extra limitcontrol shipped in the heater compartment. ReplaceTCO1following the instructions in steps 1 through 3 below. If theunit being installed does not correspond to any in thefollowing list, skip steps 1 through 3 and go on to next stepin the installation process.

Unit Model Number

YZC048F** (L,X),YZC036E** (M,Y) direct drive ID motor.

1. Remove the heat section access panel.

2. RemoveTCO1 from shipping location, attached to thecombustion blower.

3. Replace and discard the existingTCO1 originallyinstalled at the factory for down flow operation withtheTCO1 shipped attached to the combustion blowerfor horizontal operation.

4. Replace heat section access panel.

Return Air Smoke Detector

Note: Consult smoke detector manufacturer if daisychaining is required.

The factory installed return air smoke detector is installedin the downflow discharge position. No additional fieldsetup is required.

If a unit is to be converted to horizontal discharge, thefollowing conversion must be performed:

1. If the unit has an economizer, it must be pulled out inthe operating position.

2. Remove the 3 screws from the mounting brackets.

Note: Refer to downflow view for screws locations.

3. Lift the tube and bracket from the downflow ductopening. Rotate the tube and bracket assembly 180°ensuring that the holes on the copper sensing tubeface away from the unit and face the return airductwork.

Figure 15. Duct cover

Figure 16. TCO1 location (YZC036E)

RTV Sealant

Location of TC01 Limitfor the YZC036E

FlameRollout Limit

Location of TC01 Limitfor the YZC048F and YZC060E

WARNING

Hazardous Voltage!

Disconnect all electric power, including remotedisconnects before servicing. Follow proper lockout/tagout procedures to ensure the power can not beinadvertently energized. Failure to disconnect powerbefore servicing could result in death or serious injury.

Figure 17. Downflow view

Remove 3 Screws

Downflow View

RT-SVX46C-EN 21

Installation

Note: Refer Figure 18, p. 22 and Figure 19, p. 22 forscrews location.

Note: Check to insure that the flexible tubing lies flat onthe base pan surface.

4. Slide the top bracket down the copper sensing tube.ForYZC036E units insert the tab on the left side into theslot on the indoor coil block off and secure the rightside of the bracket with one of the 3 screws removed in

step 2. Refer to Figure 18, p. 22. ForYZC048F andYZC060E units secure the tab on left side to the indoorcoil block off with one of the screws removed in step 2and secure the right side of the bracket with one of thescrews removed from the access panel. Refer toFigure 19, p. 22.

5. Using the remaining 2 screws removed in step 2,secure the bottom bracket. Refer to Figure 18, p. 22.

Note: Larger diameter holes on bottom bracket line upwith the dimples on the rear panel.The smallerdiameter holes line up with the screw holes in therear panel.

Main Electrical Power

Requirements

Verify that the power supply complies with the unitnameplate specifications.

• Inspect all control panel components; tighten anyloose connections.

• Connect properly sized and protected power supplywiring to a field-supplied/installed disconnect switchand to the main power terminal block (HTB1) in the unitcontrol panel.

• Install proper grounding wires to an earth ground.

Figure 18. Horizontal view 1

Figure 19. Horizontal view 2

Slot

Horizontal View

3 Screws

4 Screws

Horizontal View 2

WARNING

Hazardous Voltage w/Capacitors!

Disconnect all electric power, including remotedisconnects and discharge all motor start/runcapacitors before servicing. Follow proper lockout/tagout procedures to ensure the power cannot beinadvertently energized. Verify with an appropriatevoltmeter that all capacitors have discharged. Failure todisconnect power and discharge capacitors beforeservicing could result in death or serious injury.

For additional information regarding the safe dischargeof capacitors, see PROD-SVB06A-EN

WARNING


All field wiring MUST be performed by qualifiedpersonnel. Improperly installed and grounded fieldwiring poses FIRE and ELECTROCUTION hazards.Toavoid these hazards, you MUST follow requirements forfield wiring installation and grounding as described inNEC and your local/state electrical codes. Failure tofollow code could result in death or serious injury.

22 RT-SVX46C-EN

Installation

Through-the-Base Gas Installation

The gas supply line must extend 4⅝” above the base pan.The “Through-the-Base Gas” kit is located in the HeatVestibule compartment.To gain access to the kit, removethe Heat Compartment access panel.

1. Remove the pipe assembly strapped to the manifold.Unscrew 90° elbow from 6½” nipple and slide rubbergrommet off of nipple.

2. Remove the plastic plug from the hole in the centerpost and insert the grommet removed from6½” pipe nipple.

3. Using pipe sealant, attach the 90° elbow to the gassupply line.

4. Disconnect the 5" pipe nipple and union from the“Through-the-Base Gas” kit assembly.

5. Using pipe sealant, attach the 6½” nipple and gasshutoff assembly to the 90° elbow on the gas supplyline.

6. Using pipe sealant, attach the 5" pipe nipple and unionto the street el attached to the gas valve.

7. Connect 5" pipe nipple and union to 6½” nipple andgas shutoff assembly.

Requirements for Gas Heat

Note: The unit gas train and optional through-the-basegas shut-off valve are rated at 1/2 PSIG maximum.A pressure reducing regulator is recommended toprevent this maximum from being exceeded.These components must be isolated during fieldgas piping test that exceed 1/2 PSIG. It isrecommended that the field piping be capped priorto the unit gas train or optional through-the-basegas shut-off valve if present.

• Gas supply line properly sized and connected to theunit gas train.

• All gas piping joints properly sealed.

• Gas piping leak checked with a soap solution. If pipingconnections to the unit are complete, do not pressurize

piping in excess of 0.50 psig or 14" W.C. to preventcomponent failure.

• Drip leg Installed in the gas piping near the unit.

• Minimum gas supply pressure should be 4.5" W.C.

• Maximum gas supply pressure must not exceed 14.0"W.C.

• Manifold pressure for single stage heaters should beset to 3.3" W.C.

• Manifold pressure for two stage heaters should be setto 3.5" W.C. on HIGH FIRE and 1.8" W.C. on LOW FIRE.

• Flue Exhaust clear of any obstruction.

Condensate Drain Configuration

An evaporator condensate drain connection is providedon each unit. Refer to Figure 10, p. 18 and Figure 11, p. 18for the appropriate drain location.

The condensate drain pan is factory installed to draincondensate to the back side of the unit. See Figure 10, p. 18and Figure 11, p. 18. It can be converted to draincondensate out the front side of the unit or through-the-base.

To convert drain condensate out the front of unit:

1. Remove evaporator access panel and supply air accesspanels.

2. Remove the support panel that the condensate drainpan exits through.

3. Slide the condensate drain pan out of the unit androtate 180°.

4. Slide the condensate drain pan back into the unit, alignthe drain with the grommeted opening in the rearsupport panel and push until the coupling is seated inthe grommet.

5. Replace the front support panel by aligning the panelwith tabs in the raceway. Align the condensate drainpan support in the grommeted hole as the panel is putin place.

6. Replace evaporator access panel and supply air accesspanels.

To convert drain condensate through-the-base of unit:

1. Remove evaporator access panel and supply air accesspanels.

2. Remove the support panel that the condensate drainpan exits through.

3. Slide the condensate drain pan out of the unit.

4. Place on a level surface in the position it was removedfrom the unit.

5. Remove the plug knockout in the bottom of the drainpan to convert it to through-the-base drainage.

6. Plug the original condensate drain opening with a fieldsupplied 3/4” NPT plug.

Figure 20. Typical through-the-base gas installation

90° Elbow

6 1/2” (165 MM) Pipe Nipple

Gas Shut-Off Valveand Street Elbow

90° Elbow and Nipples

5” (127 MM) Pipe Nipple and Union

RT-SVX46C-EN 23

Installation

7. Slide the condensate drain pan back into the unit, alignthe drain support with the grommeted opening in therear support panel and push until the support is seatedin the grommet.

8. Replace the front support panel by aligning the panelwith tabs in the raceway.Align the plugged condensatedrain pan coupling in the grommeted hole as the panelis put in place.

9. Replace evaporator access panel and supply air accesspanels.

A condensate trap must be installed at the unit due to thedrain connection being on the “negative pressure” side ofthe fan. Install the P-Trap using the guidelines in Figure 21,p. 24.

A condensate drain line must be connected to the P-Trap.Pitch the drain lines at least 1/2 inch for every 10 feet ofhorizontal run to assure proper condensate flow. Do notallow the horizontal run to sag causing a possible double-trap condition which could result in condensate backupdue to “air lock”.

Drain Pan Removal (Units with Condensate

Overflow Switch Option)

Before drain pan removal, the switch wire must bedisconnected from wire tie on panel and/or any tapebefore drain pan can be removed.

Care must be taken so the wire does not catch on thebottom of indoor coil or any protrusion.

Note: When reversing the drain pan, on some units, thecondensate overflow switch will need to be movedto the second hole in its bracket to avoid contactwith headers or indoor coil.

Filter Installation

The quantity of filters is determined by unit size. Access tothe filters is obtained by removing the filter access panel.

Refer to the unit Service Facts (shipped with each unit) forfilter requirements.

Note: Do not operate the unit without filters.

Field Installed Power Wiring

An overall dimensional layout for the field installed wiringentrance into the unit is illustrated in “Unit Dimensions,”p. 12.To insure that the unit’s supply power wiring isproperly sized and installed, follow the followingguidelines.

Verify that the power supply available is compatible withthe unit’s nameplate ratings.The available supply powermust be within 10% of the rated voltage stamped on thenameplate. Use only copper conductors to connect thepower supply to the unit.

Note: If the unit is not equipped with an optional factoryinstalled non-fused disconnect switch or circuitbreaker, a field supplied disconnect switch must beinstalled at or near the unit in accordance with theNational Electrical Code (NEC latest edition).

Main Unit Power

Figure 21. Condensate trap installation

Panel Enclosure

.75 inch NPTFemale Connector

CleanoutPlug

1.5”38.1 MM

WARNING



NOTICE:

Use Copper Conductors Only!

Unit terminals are not designed to accept other typesof conductors. Failure to use copper conductors couldresult in equipment damage.

WARNING



24 RT-SVX46C-EN

Installation

Standard Wiring

1. Location of the applicable electrical service entrance isillustrated in “Unit Dimensions,” p. 12. Complete theunit’s power wiring connections at CompressorContactor # 1 (CC1) inside the unit control panel. Referto the customer connection diagram that is shippedwith the unit for specific termination points

2. Provide proper grounding for the unit in accordancewith local and national codes.

OptionalTBUE Wiring (Through-the-BaseElectrical Option)

1. Location of the applicable electrical service isillustrated below. Refer to the customer connectiondiagram that is shipped with the unit for specifictermination points.The termination points, dependingon the customer option selected would be a factorymounted non-fused disconnect switch (UDC) or circuitbreaker (UCB). If neither a factory mounted non-fuseddisconnect switch (UDC) or circuit breaker (UCB) wasfactory mounted, field wiring connections should beterminated in the control box at Compressor Contactor# 1 (CC1).

2. Provide proper grounding for the unit in accordancewith local and national codes.

Note: Black Gasket is shipped from the factory and islocated in the literature ship-with bag in the controlbox.Apply Black Gasket around conduit plate on all4 sides after installation to prevent air leakage fromthe building entering the electrical enclosures.

Note: Seal between wiring and conduit with Black Gasketor weather proof sealer to prevent air leakage fromthe building entering the electrical enclosures.Alsoseal around conduit and wiring at all roof and curbpenetrations.

Field-Installed Control Wiring

An overall layout of the various control options availablewith the required number of conductors for each controldevice is illustrated in Figure 20, p. 23.

Note: All field wiring must conform to NEC guidelines aswell as state and local codes.

Control PowerTransformer

The 24 volt control power transformers are to be used onlywith the accessories called out in this manual.Transformers rated greater than 50 VA are equipped withinternal circuit breakers. If a circuit breaker trips, turn“Off”all power to the unit before attempting to reset it.

The transformer is located in the control panel.The circuitbreaker is located on the left side of the transformer andcan be reset by pressing in on the black reset button.

Controls using DC Analog Input/Outputs(Standard Low Voltage Multiconductor Wire)

Before installing any connecting wiring between the unitand components utilizing a DC analog input\output signal,refer to “Unit Dimensions,” p. 12 for the electrical accesslocations provided on the unit.

WARNING

Hazardous Voltage!


Figure 22. All ultra high efficiency units

WARNING

Hazardous Voltage!


Seal between wiring and conduitwith weather proofsealer to preventair leakage

Control Wiring Conduit

Black Gasket

Field PoweredConvenience Outlet

Conduit

Power Wiring Conduit

RT-SVX46C-EN 25

Installation

• Table 4, p. 26 lists the conductor sizing guidelines thatmust be followed when interconnecting the DC binaryoutput devices and the system components utilizing aDC analog input/output signal to the unit.

Note: Resistance in excess of 2.5 ohms per conductor cancause deviations in the accuracy of the controls.

Note: Ensure that the wiring between controls and theunit’s termination point does not exceed two and ahalf (2.5) ohms/conductor for the length of the run.

• Do not run the electrical wires transporting DC signalsin or around conduit housing high voltage wires.

• Route low voltage wiring per illustrations on page 27.

DC Conductors

Table 4. Zone sensor module wiring

Distance from Unit to Control Recommended Wire Size

0 - 150 feet 22 gauge

0 - 45.7 m .33 mm2

151 - 240 feet 20 gauge

46 - 73.1 m .50 mm2

241 -385 feet 18 gauge

73.5 - 117.3 m .75 mm2

386 - 610 feet 16 gauge

117.7 - 185.9 m 1.3 mm2

611 - 970 feet 14 gauge

186.2 - 295.7 m 2.0 mm2

Figure 23. ReliaTel™ options module

Figure 24. ReliaTel™ relative humidity sensor (enhanced

dehumidification operation)

Figure 25. ReliaTel™ humidistat (enhanced

dehumidification operation)

J8

TP1

DA COOLFAN SPD

TP2DA HEAT

TP3 EXHFAN

SPC PRESS DB SPC PRESS J4 J9 J10 J11

J12

J3

TP4 TP5DEHUMID

TB1

TB2

J6

J7J5

J1J2

Low VoltageTerminal Block

NLTB

NLTBLocated on Frontof Rooftop Unit

Control Box

Relative HumiditySensor

(Field Supplied)

Field Supplied Cable

NLTB12 13

15

17

19

14

16

18R.H.+ R.H.-

Low VoltageTerminal Block

Humidistat(Field Supplied)

Field SuppliedWire

COMHI

LTBLocated on Frontof Rooftop Unit

Control Box

LTB

7

9

11

13

8

10

12

14

26 RT-SVX46C-EN

Installation

SpaceTemperature Averaging

(ReliaTel™ Only)

Space temperature averaging is accomplished by wiring anumber of remote sensors in a series/parallel circuit.

Using the BAYSENS016* or BAYSENS077*, at least foursensors are required to accomplish space temperatureaveraging. See diagram below.

• Example #1 illustrates two series circuits with twosensors in each circuit wired in parallel.The square ofany number of remote sensors is required.

• Example #2 illustrates three sensors squared in aseries/parallel circuit. Using BAYSENS077*, twosensors are required to accomplish space temperatureaveraging.

• Example #3 illustrates the circuit required for thissensor. Table 5, p. 29 lists the temperature versusresistance coefficient for all sensors.

Figure 26. ReliaTel™ control customer low voltage routing (all units)

Refrigeration

Module

Communication

Interface

LTB

ReliaTel

Conventional Wiring

Route Field Wiring as shown

and Secure with 2 Wire Ties

ReliaTel

TBU Wiring

Route Field Wiring as shown

and Secure with 3 Wire Ties

Communication

Interface

Refrigeration

Module

LTB

TBU

Option

Unpowered

Convenience

Outlet

Secure Field

Installed Wiring

for Convenience

Outlet with

Pop-In Wire Tie

Figure 27. Examples

RT-SVX46C-EN 27

Installation

Figure 28. Typical field wiring diagrams for optional controls (ReliaTel™ only)

BAYSENS075*BAYSENS075*

BAYSENS119*

BAYSENS110*BAYSENS108*BAYSENS106*

BAYSENS073* BAYSENS074*BAYSENS075*ASYSTAT669AOPTIONAL REMOTE SENSOR

28 RT-SVX46C-EN

Installation

Table 5. Temperature vs. resistance

Temperature

Degrees F° Degrees C° Nominal Resistance

-20° -28.9° 170.1 K - Ohms

-15° -26.1° 143.5 K - Ohms

-10° -23.3° 121.4 K - Ohms

-5° -20.6° 103.0 K - Ohms

0° -17.8° 87.56 K - Ohms

5° -15.0° 74.65 K - Ohms

10° -12.2° 63.80 K - Ohms

15° -9.4° 54.66 K - Ohms

20° -6.7° 46.94 K - Ohms

25° -3.8° 40.40 K - Ohms

30° -1.1° 34.85 K - Ohms

35° 1.7° 30.18 K - Ohms

40° 4.4° 26.22 K - Ohms

45° 7.2° 22.85 K - Ohms

50° 10.0° 19.96 K - Ohms

55° 12.8° 17.47 K - Ohms

60° 15.6° 15.33 K - Ohms

65° 18.3° 13.49 K - Ohms

70° 21.1° 11.89 K - Ohms

75° 23.9° 10.50 K - Ohms

80° 26.7° 9.297 K - Ohms

85° 29.4° 8.247 K - Ohms

90° 32.2° 7.330 K - Ohms

95° 35.0° 6.528 K - Ohms

Table 6. Sizing natural gas pipe mains and branches

Iron Pipe Size (IPS) Inches

Length of Pipe (Ft.)½" Pipe

¾" Pipe

1" Pipe

1¼" Pipe

1½" Pipe

15 76 176 345 750 1220

30 52 120 241 535 850

45 43 99 199 435 700

60 38 86 173 380 610

75 77 155 345 545

Note: Capacity of Pipe of Different Diameters and Lengths in Cu. Ft. Per Hr. with Pressure Drop of 0.3" and Specific Gravity of 0.60

Table 7. Iron pipe size (SI) millimeters

Iron Pipe Size (SI) Millimeters

Length of Pipe (Meters)

15 mm Pipe

20 mm Pipe

25 mm Pipe

32 mm Pipe

40 mm Pipe

4.6 2.15 4.98 9.76 21.23 34.54

9.1 1.47 3.39 6.82 15.14 24.06

13.7 1.21 2.80 5.63 12.31 19.82

18.3 1.07 2.43 4.89 10.76 17.27

22.9 — 2.18 4.38 9.76 15.40

Note: Capacity of Pipe of Different Diameters and Lengths in Cu. Meter Per Hr. with Pressure Drop of 74.6 Pa and Specific Gravity of 0.60.

Figure 29. Schematic diagram for field gas piping to

unit

1/8” NPT Test Plug Field Supplied Ground Union

6” Min

To Gas TrainUnit Access Hole

Drip Leg

Gas Supply LineGas Shutoff (Field Supplied

Outside Unit Cabinet)

RT-SVX46C-EN 29

Pre-Start

Use the checklist provided below in conjunction with the“General Unit Requirements” checklist to ensure that theunit is properly installed and ready for operation.

Verify that the condenser airflow will be unobstructed.

• Verify that the condenser fan and indoor blower turnfreely without rubbing and are properly tightened onthe shafts.

• Verify that a condensate trap is installed and the pipingis properly sized and pitched.

• Verify that the correct size and number of filters are inplace.

• Inspect the interior of the unit for tools and debris andinstall all panels in preparation for starting the unit.

Voltage Imbalance

Three phase electrical power to the unit must meetstringent requirements for the unit to operate properly.

Measure each leg (phase-to-phase) of the power supply.Each reading must fall within the utilization range stampedon the unit nameplate. If any of the readings do not fallwithin the proper tolerances, notify the power company tocorrect this situation before operating the unit.

Excessive three phase voltage imbalance between phaseswill cause motors to overheat and eventually fail.Themaximum allowable voltage imbalance is 2%. Measure

and record the voltage between phases 1, 2, and 3 andcalculate the amount of imbalance as follows:

V1, V2, V3 = Line Voltage Readings

VD = Line Voltage reading that deviates the farthest fromthe average voltage.

Example: If the voltage readings of the supply powermeasured 221, 230, and 227, the average volts would be:

VD (reading farthest from average) = 221

The percentage of imbalance equals:

The 2.2% imbalance in this example exceeds themaximum allowable imbalance of 2.0%.This muchimbalance between phases can equal as much as a 20%current imbalance with a resulting increase in motorwinding temperatures that will decrease motor life. If thevoltage imbalance is over 2%, notify the proper agenciesto correct the voltage problem before operating thisequipment.

Electrical Phasing (Three Phase

Motors)

The compressor motor(s) and the supply fan motor areinternally connected for the proper rotation when theincoming power supply is phased as A, B, C.

Proper electrical supply phasing can be quicklydetermined and corrected before starting the unit by usingan instrument such as an Associated Research Model 45Phase Sequence Indicator and following the steps below:

• Turn the field supplied disconnect switch that providespower to the main power terminal block or to the“Line” side of the optional factory mounted disconnectswitch to the “Off” position.

• Connect the phase sequence indicator leads to theterminal block or to the “Line” side of the optionalfactory mounted disconnect switch as follows;

Black (phase A) to L1

Red (phase B) to L2

Yellow (phase C) to L3

• Close the field supplied main power disconnect switchor circuit protector switch that provides the supplypower to the unit.

Note: Upon closing main power disconnect and the unitmounted disconnect switch or circuit breaker, the

WARNING

Hazardous Voltage w/Capacitors!

Disconnect all electric power, including remotedisconnects and discharge all motor start/runcapacitors before servicing. Follow proper lockout/tagout procedures to ensure the power cannot beinadvertently energized. Verify with an appropriatevoltmeter that all capacitors have discharged. Failure todisconnect power and discharge capacitors beforeservicing could result in death or serious injury.

For additional information regarding the safe dischargeof capacitors, see PROD-SVB06A-EN

WARNING

Rotating Components!

During installation, testing, servicing andtroubleshooting of this product it may be necessary towork with live and exposed rotating components. Havea qualified or licensed service individual who has beenproperly trained in handling exposed rotatingcomponents, perform these tasks. Failure to follow allsafety precautions could result in rotating componentscutting and slashing technician which could result indeath or serious injury.

% Voltage Imbalance= 100 x AV - VD where;AV

AV (Average Voltage)= Volt 1 + Volt 2 + Volt 33

221 + 230 + 227 = 226 Avg.3

100 x 226 - 221 = 2.2%226

30 RT-SVX46C-EN

Pre-Start

phase monitor will verify proper phasing. If LED onface of the monitor is red, correct supply powerfault.

To prevent injury or death from electrocution, it is theresponsibility of the technician to recognize this hazardand use extreme care when performing serviceprocedures with the electrical power energized.

• Observe theABC and CBA phase indicator lights on theface of the sequencer.TheABC indicator light will glowif the phase is ABC. If the CBA indicator light glows,open the disconnect switch or circuit protection switchand reverse any two power wires.

• Restore the main electrical power and recheck thephasing. If the phasing is correct, open the disconnectswitch or circuit protection switch and remove thephase sequence indicator.

Compressor Crankcase Heaters

Each compressor can be equipped with a crankcaseheater.The proper operation of the crankcase heater isimportant to maintain an elevated compressor oiltemperature during the “Off” cycle to reduce oil foamingduring compressor starts. Oil foaming occurs whenrefrigerant condenses in the compressor and mixes withthe oil. In lower ambient conditions, refrigerant migrationto the compressor could increase.

When the compressor starts, the sudden reduction incrankcase pressure causes the liquid refrigerant to boilrapidly causing the oil to foam.This condition coulddamage compressor bearings due to reduced lubricationand could cause compressor mechanical failures.

Before starting the unit in the “Cooling” mode, set thesystem switch to the “Off” position and turn the mainpower disconnect to the “On” position and allow thecrankcase heater to operate a minimum of 8 hours.

Before closing the main power disconnect switch, insurethat the “System” selection switch is in the “Off” positionand the “Fan” selection switch is in the “Auto” position.

Close the main power disconnect switch and the unitmounted disconnect switch, if applicable.

Note: Upon closing main power disconnect and the unitmounted disconnect switch or circuit breaker, thephase monitor will verify proper phasing. If LED on

face of the monitor is red, correct supply powerfault.


ReliaTel™ Controls

Upon power initialization, the RTRM performs self-diagnostic checks to insure that all internal controls arefunctional. It also checks the configuration parametersagainst the components connected to the system.TheLiteport LED located on the RTRM module is turned “On”within one second of power-up if internal operation isokay.

Use one of the following“Test” procedure to bypass sometime delays and to start the unit at the control panel. Eachstep of unit operation can be activated individually bytemporarily shorting across the“Test” terminals for two tothree seconds.The Liteport LED located on the RTRMmodule will blink when the test mode has been initiated.The unit can be left in any “Test” step for up to one hourbefore it will automatically terminate, or it can beterminated by opening the main power disconnect switch.Once the test mode has been terminated, the Liteport LEDwill glow continuously and the unit will revert to the“System” control.

WARNING

Live Electrical Components!

During installation, testing, servicing andtroubleshooting of this product, it may be necessary towork with live electrical components. Have a qualifiedlicensed electrician or other individual who has beenproperly trained in handling live electrical componentsperform these tasks. Failure to follow all electrical safetyprecautions when exposed to live electricalcomponents could result in death or serious injury.

WARNING


During installation, testing, servicing andtroubleshooting of this product, it may be necessary towork with live electrical components. Have a qualifiedlicensed electrician or other individual who has beenproperly trained in handling live electrical componentsperform these tasks. Failure to follow all electricalsafety precautions when exposed to live electricalcomponents could result in death or serious injury.

RT-SVX46C-EN 31

Pre-Start

Test Modes

There are three methods in which the “Test” mode can becycled at LTB-Test 1 and LTB-Test 2.

1. StepTest Mode -This method initiates the differentcomponents of the unit, one at a time, by temporarilyshorting across the two test terminals for two to threeseconds. For the initial start-up of the unit, this methodallows the technician to cycle a component “On” andhave up to one hour to complete the check.

2. ResistanceTest Mode -This method can be used forstart-up providing a decade box for variable resistanceoutputs is available.This method initiates the differentcomponents of the unit, one at a time, when a specificresistance value is placed across the two testterminals.The unit will remain in the specific test modefor approximately one hour even though theresistance is left on the test terminals.

3. AutoTest Mode -This method is not recommended forstart-up due to the short timing between individualcomponent steps.This method initiates the differentcomponents of the unit, one at a time, when a jumperis installed across the test terminals.The unit will startthe first test step and change to the next step every 30seconds.

At the end of the test mode, control of the unit willautomatically revert to the applied “System” controlmethod.

For unit test steps, test modes, and step resistance valuesto cycle the various components, refer to Table 8, p. 32.

ReliaTel™ Controls

Upon power initialization, the Gas Ignition Module (IGN)performs self-diagnostic checks to insure that all internalcontrols are functional. It also checks the configurationparameters against the components connected to thesystem.The System LED located on the IGN module isturned “On” within one second of power-up if internaloperation is okay.

Table 8. Service test guide for component operation

Test Step Mode Fan Econ (a) Comp 1 Comp 2 Heat 1 Heat 2 ResistancePWM

Output(b)

1Fan On

Minimum Position

Setpoint 0%Off Off Off Off

2.2KΩ 50%Minimum

VentilationOn Selectable Off Off Off Off

2EconomizerTest Open

On Open Off Off Off Off 3.3KΩ 50%(c)

3Cool

Stage 1On

MinimumPosition

On (d) Off Off Off 4.7KΩ 82%

4 (e) Cool Stage 2

OnMinimumPosition

On (d) On (d) Off Off 6.8KΩ 100%

5 (e) Cool Stage 3

OnMinimumPosition

On (d) On (d) Off Off 8.2KΩ 100%

6 (e) Reheat On Minimum On On Off Off 33KΩ 100%(f)

7 (e) HeatStage 1

On Minimum Off Off On Off 10KΩ 100%

8 (e) HeatStage 2

On Minimum Off Off On On 15KΩ 100%

(a) The exhaust fan will turn on anytime the economizer damper position is equal to or greater than the exhaust fan setpoint.(b) The PWM Output is in reference to the user selected maximum unit fan speed.(c) Regardless of the Economizer Mode configuration, the unit will run the Supply Fan at the minimum speed during the Economizer step of the

Service Test.(d) The condenser fans will operate any time a compressor is ‘On’ providing the outdoor air temperatures are within the operating values.(e) Steps for optional accessories and non-applicable modes in unit will be skipped.(f) Units with Enhanced Dehumidification only will not perform this step during Service Test.

32 RT-SVX46C-EN

Unit Start-Up

Verifying Proper Air Flow

Sequence of Operation

General Standby Mode

During normal occupied periods, when there is no spacecooling or heating demands, the user will be able tochoose Constant or Cycling supply fan operation. Duringthis period, if the supply fan is operating due to a ConstantFan Mode selection or due to a ventilation request, thesupply fan will operate at 50% of the user selected,application specific, maximum airflow.The unit controlswill be compatible with BACnet™ and LonTalk™ BuildingAutomation System communication interfaces.

Cooling Operation

Default Operation: During Cooling operation, thecontrol will monitor the SpaceTemperature and SpaceCooling setpoint and with a PI control algorithm determineif active cooling capacity is required. As the SpaceTemperature deviates from the Space Cooling Setpoint,the unit controller will calculate an active Discharge AirCooling setpoint that the economizer (if installed) andcompressor and outdoor fan outputs will be modulated tomeet.This active Discharge Air Cooling setpoint will becalculated between the Space Cooling setpoint and a useradjustable minimum (65°F default for Single ZoneVariableAir Volume SZVAV). Once the control determines that adischarge air temperature equal to the user selectedminimum (65°F default) is required to meet the spacecooling demand, if the space demand continues toincrease, the supply fan speed will be allowed to increaseabove its minimum speed proportionally to meet theadditional demand.

Alternate Economizer Operation: Under the DefaultOperation, as described above, the supply fan speed willremain at minimum speed, as determined by the activecooling stages, until the space demand requires anincrease in supply airflow.The customer will have theability to choose to allow the supply fan speed to increasewhen the economizer is enthalpy enabled in order torealize the maximum cooling capacity of the economizer,prior to energizing compressor outputs, when the spacerequires active cooling capacity. All cooling capacity

demand decisions will function as described in the“Default Operation” section above with the exception ofthe supply fan speed when the unit has an active coolingdemand and the economizer is enthalpy enabled.

Heating Operation

During Heating operation, the control will monitor theSpaceTemperature and Space Heating setpoint and witha PI control algorithm determine if active heating capacityis required. As the SpaceTemperature deviates from theSpace Heating Setpoint, the unit controller will increasethe supply airflow up to the user selected, applicationspecific, maximum airflow and begin to stage heatingoutputs (gas or electric) to meet the space demand.Thecustomer will also have the ability to enable Supply AirTempering control which will allow the unit to bring on onestage of heating when the discharge air temperature fallsbelow the Space Heating Setpoint - 10°F and the unit isoperating in a minimum ventilation state with the supplyfan running (not actively heating or cooling).The supplyfan output will increase to the user selected, applicationspecific, maximum airflow during Supply AirTemperingoperation.

Enhanced Dehumidification

Enhanced Dehumidification will be available on all unitsequipped with a Space Humidity sensor. Once the SpaceHumidity value exceeds the Dehumidification Setpointand dehumidification is enabled the unit will maintain thecompressor operation and reduce the indoor fan airflow toincrease latent capacity. If the Space Humidity valueexceeds the Dehumidification Setpoint during no activecall for cooling, the unit will energize the compressor andfans to an optimum capacity for dehumidification. Ifduring active enhanced dehumidification the SpaceHumidity falls below the Dehumidification Setpoint – 2%,Dehumidification will be terminated and the unit willtransition back to normal Cooling or Heating control.

Supply AirTemperature Control with an

Economizer

The economizer is utilized to control the supply air coolingat +1.5°F around the supply air temperature setpoint rangeof 40°F and 90°F providing the outside air conditions aresuitable.To reduce the risk of evaporator coil freeze-upsupply air temperature should not be set below 50° F.While economizing, the mechanical cooling is disableduntil the economizer dampers have been fully open forthree minutes. If the economizer is disabled due tounsuitable conditions, the mechanical cooling will cycle asthough the unit had no economizer.

Note: The RTRM is designed to maintain a selectablesupply air temperature of 40°F to 90°F with a +/-3.5°F deadband. However, to reduce the risk ofevaporator coil freeze-up in Precedent andVoyager

WARNING


During installation, testing, servicing andtroubleshooting of this product, it may be necessary towork with live electrical components. Have a qualifiedlicensed electrician or other individual who has beenproperly trained in handling live electrical componentsperform these tasks. Failure to follow all electrical safetyprecautions when exposed to live electricalcomponents could result in death or serious injury.

RT-SVX46C-EN 33

Unit Start-Up

Light Commercial applications, supply airtemperature should not be set below 50°F.

ZoneTemperature Control without a Night

Setback Panel or ICS - Unoccupied Cooling

When a field supplied occupied/unoccupied switchingdevice is connected between RTRM J6-11 and RTRM J6-12,both the economizer and the mechanical cooling will bedisabled.

ZoneTemperature Control without a Night

Setback Panel or ICS - Unoccupied Heating

When a field supplied occupied/unoccupied switchingdevice is connected between RTRM J6-11 and J6-12 andDWU is enabled, the zone temperature will be controlled at10°F below the Morning Warm-up setpoint, but not lessthan 50°F, by cycling one or two stages of either gas orelectric heat, whichever is applicable.

Morning Warm-up (MWU) Control

Note: Heating control only used on Multi-Zone VAVapplications.

Morning warm-up is activated if the zone temperature is atleast 1.5°F below the MWU setpoint whenever the systemswitches from unoccupied to occupied status.The MWUsetpoint may be set from the unit mounted potentiometeror a remotely mounted potentiometer.The setpointranges are from 50°F to 90°F. When the zone temperaturemeets or exceeds the MWU setpoint, the unit will switch tothe “Cooling” mode.The economizer will be held closedduring the morning warm-up cycle.

Daytime Warm-up (DWU) Control

Note: Heating control only used on Multi-Zone VAVapplications.

Daytime warm-up is applicable during occupied statusand when the zone temperature is below the initiationtemperature. It can be activated or deactivated throughICS or a night setback zone sensor. If ICS or a night setbackzone sensor is not utilized, DWU can be activated bysetting the DWU enable DIP switch (RTAM) to ON andsupplying a valid morning warm-up setpoint.

The unit is shipped with a morning warm-up setpointconfigured and the daytime warm-up function is activated(switch on). Opening the DWU enable switch will disablethis function.

If the system control is local, the DWU initiation setpoint is3°F below the morning warm-up setpoint.The terminationsetpoint is equal to the morning warm-up setpoint.

If the system control is remote (Tracer™), the DWUsetpoint is equal to theTracer™ occupied heating setpoint.The initiation and termination setpoints are selectablesetpoints designated byTracer™.

When the zone temperature meets or exceeds thetermination setpoint while the unit is in an occupied,

“Auto” mode or switched to the “Cooling” mode, the unitwill revert to the cooling operation.

If an occupied “Heating” mode is selected, the unit willonly function within the DWU perimeters until the system

is switched from the“Heat” mode or enters an unoccupiedstatus.

Return Air Smoke Detector

The return air smoke detector is designed to shut off theunit if smoke is sensed in the return air stream. Samplingthe airflow entering the unit at the return air openingperforms this function.

In order for the smoke detector to properly sense smoke inthe return air stream, the air velocity entering the unit mustbe in accordance with manufacturers recommendedairflow limits.

Economizer Start-Up

Minimum Position Setting

ReliaTel™ Control:

Momentarily jump across theTest 1 &Test 2 terminalson LTB1 one additional time if continuing fromprevious component start-up or until the desired start-up component test is started.

1. Verify that the dampers stroked to the full openposition.

2. To stop the SERVICETEST, turn the main powerdisconnect switch to the “Off” position or proceed tothe next component start-up procedure. Remove

WARNING



WARNING



34 RT-SVX46C-EN

Unit Start-Up

electromechanical test mode connections (ifapplicable).

Compressor Start-Up

1. Attach a set of service gauges onto the suction anddischarge gauge ports for each circuit. Refer to therefrigerant circuit illustration in the Service Facts.

ReliaTel™ Control:

Momentarily jump across theTest 1 &Test 2 terminalson LTB1 one additional time if continuing fromprevious component start-up or until the desired start-up componentTest is started.

Scroll Compressors

a. Once each compressor has started, verify that therotation is correct. If a scroll compressor is rotatingbackwards, it will not pump and a loud rattlingsound can be observed.

b. If the electrical phasing is correct, beforecondemning a compressor, interchange any twoleads (at the compressorTerminal block) to checkthe internal phasing. If the compressor runsbackward for an extended period (15 to 30 minutes),the motor winding can overheat and cause themotor winding thermostat to open.

2. After the compressor and condenser fan have startedand operated for approximately 30 minutes, observethe operating pressures. Compare the operatingpressures to the operating pressure curve in theService Facts.

3. Check system superheat. Follow the instruction listedon the superheat charging curve in the Service Facts.

Superheat should be within ±5 F of the superheat chartvalue.

4. Repeat steps 1 through 4 for each refrigerant circuit.

5. To stop the SERVICETEST, turn the main powerdisconnect switch to the “Off” position or proceed tothe next component start-up procedure. Removeelectromechanical test mode connections (ifapplicable).

Gas Heat Units

Open the main disconnect switch to shut the unit off andto reset the RTRM.

ReliaTel™ Control: Follow theTest Guide in Table 8,p. 32 to start the unit in the heating mode. Momentarilyjump across theTest 1 &Test 2 terminals on LTB1 oneadditional time if continuing from previous componentstart-up or until the desired start-up componentTest isstarted.

When starting the unit for the first time or servicing theheaters, it is a good practice to start the heater with themain gas supply turned “Off”.

Once the ignition system and components have beenchecked, open the main power disconnect switch to resetthe unit.

Dip Switch Settings

Verify that the dip switch settings match the unit model asindicted in Figure 30 through Figure 32.

Final System Setup

After completing all of the pre-start and start-upprocedures outlined in the previous sections (i.e.,operating the unit in each of its Modes through allavailable stages of cooling & heating), perform these finalchecks before leaving the unit:

• Program the Night Setback (NSB) panel (if applicable)for proper unoccupied operation. Refer to theprogramming instructions for the specific panel.

• Verify that the Remote panel “System” selectionswitch, “Fan” selection switch, and “ZoneTemperature” settings for automatic operation arecorrect.

• Inspect the unit for misplaced tools, hardware, anddebris.

Figure 30. 3T ultra high efficiency unit

Figure 31. 4T ultra high efficiency unit

Figure 32. 5T ultra high efficiency unit(a)

(a) For YZC060E3 dip switch settings, reference RT-SVD007*-EN.

CN102

CN101

CN108 CN107CN105

1 – OFF

2 – OFF

3 – OFF

4 – OFF

5 – OFF

6 – OFF

CN102

CN101

CN108 CN107CN105

1 – OFF

2 – OFF

3 – ON

4 – OFF

5 – OFF

6 – ON

CN102

CN101

CN108 CN107CN105

1 – OFF

2 – OFF

3 – ON

4 – OFF

5 – ON

6 – OFF

RT-SVX46C-EN 35

Unit Start-Up

• Verify that all exterior panels including the controlpanel doors and condenser grilles are secured in place.

• Close the main disconnect switch or circuit protectorswitch that provides the supply power to the unit’sterminal block or the unit mounted disconnect switch.

36 RT-SVX46C-EN

Maintenance

Monthly Maintenance

Before completing the following checks, turn the unit OFFand lock the main power disconnect switch open.

Filters

Inspect the return air filters. Clean or replace them ifnecessary. If included, leave filter removal tool in unit.Refer to the unit Service Facts for filter information.

Return Air Smoke Detector Maintenance

Note: Consult smoke detector manufacturer if daisychaining is required.

Airflow through the unit is affected by the amount of dirtand debris accumulated on the indoor coil and filters.Toinsure that airflow through the unit is adequate for propersampling by the return air smoke detector, completeadherence to the maintenance procedures, includingrecommended intervals between filter changes, and coilcleaning is required.

Periodic checks and maintenance procedures must beperformed on the smoke detector to insure that it willfunction properly. For detailed instructions concerningthese checks and procedures, refer to the appropriatesection(s) of the smoke detector Installation andMaintenance Instructions provided with the literaturepackage for this unit.

Condensate Overflow Switch

During maintenance, the switch float (black ring) must bechecked to ensure free movement up and down.

Cooling Season

• Check the unit’s drain pans and condensate piping toensure that there are no blockages.

• Inspect the evaporator and condenser coils for dirt,bent fins, etc. If the coils appear dirty, clean themaccording to the instructions described in “CoilCleaning” later in this section.

• Manually rotate the condenser fan(s) to ensure freemovement and check motor bearings for wear. Verifythat all of the fan mounting hardware is tight.

• Inspect the F/A-R/A damper hinges and pins to ensurethat all moving parts are securely mounted. Keep theblades clean as necessary.

• Verify that all damper linkages move freely; lubricatewith white grease, if necessary.

• Check supply fan motor bearings; repair or replace themotor as necessary.

• Check the fan shaft bearings for wear. Replace thebearings as necessary.

• Check the supply fan belt. If the belt is frayed or worn,replace it. Refer to the “Fan Belt Adjustment” sectionfor belt replacement and adjustments.

• Verify that all wire terminal connections are tight.

• Remove any corrosion present on the exterior surfacesof the unit and repaint these areas.

• Generally inspect the unit for unusual conditions (e.g.,loose access panels, leaking piping connections, etc.)

• Make sure that all retaining screws are reinstalled inthe unit access panels once these checks are complete.

• With the unit running, check and record the: ambienttemperature; compressor suction and dischargepressures (each circuit); superheat (each circuit);

• Record this data on an “operator’s maintenance log”like the one shown in Table 9, p. 39. If the operatingpressures indicate a refrigerant shortage, measure thesystem superheat. For guidelines, refer to the“Compressor Start-Up” section.

Important: Do not release refrigerant to theatmosphere! If adding or removingrefrigerant is required, the servicetechnician must comply with all federal,state and local laws.

Heating Season

• Inspect the unit’s air filters. If necessary, clean orreplace them.

• Check supply fan motor bearings; repair or replace themotor as necessary.

• Inspect both the main unit control panel and heatsection control box for loose electrical components

WARNING



WARNING

Hazardous Voltage!


RT-SVX46C-EN 37

Maintenance

and terminal connections, as well as damaged wireinsulation. Make any necessary repairs.

• Clean burner area, verify gas heat system operatesproperly.

Coil Cleaning

Regular coil maintenance, including annual cleaning,enhances the unit’s operating efficiency by minimizing:compressor head pressure and amperage draw,evaporator water carryover, fan brake horsepower due toincrease static pressure losses, airflow reduction.

At least once each year, or more often if the unit is locatedin a “dirty” environment, clean the evaporator andcondenser coils using the instructions outlined below. Besure to follow these instructions as closely as possible toavoid damaging the coils.

Note: For units equipped with hail guards follow removalprocedure listed below.

Hail Guard Removal

• Unlatch hail guard.

• Pull the top of the hail guard outward until the fastenerstuds are free of the retaining nuts.

• Lift the hail guard from the lower retaining bracket andset aside.

Microchannel (MCHE) Coils

Due to the soft material and thin walls of the MCHE coils,the traditional field maintenance method recommendedfor RoundTube Plate Fin (RTPF) coils does not apply tomicrochannel coils.

Moreover, chemical cleaners are a risk factor to MCHE dueto the material of the coil.The manufacturer does notrecommend the use of chemical cleaners to cleanmicrochannel coils. Using chemical cleaners could lead towarranty claims being further evaluated for validity andfailure analysis.

The recommended cleaning method for microchannelcondenser coils is pressurized water or air with a non-pinpoint nozzle and an ECU of at least 180 with pressure nogreater than 600 psi.To minimize the risk of coil damage,approach the cleaning of the coil with the pressure washeraimed perpendicular to the face of the coil during cleaning.

Note: For more details on Microchannel coil cleaning,please refer to bulletin RT-SVB83*-EN.

RoundTube Plate Fin (RTPF) Coils

To clean refrigerant coils, use a soft brush and a sprayer(either a garden pump-up type or a high-pressure sprayer).A high-quality detergent is also required; suggestedbrands include “SPREX A.C.”, “OAKITE 161”, “OAKITE 166”and“COILOX”. If the detergent selected is strongly alkaline(ph value exceeds 8.5), add an inhibitor.

1. Remove enough panels from the unit to gain access tothe coil.

2. Protect all electrical devices such as motors andcontrollers from any over spray.

3. Straighten any bent coil fins with a fin comb.

4. Mix the detergent with water according to themanufacturer’s instructions. If desired, heat thesolution BUT DO NOT EXCEED 150ºF maximum toimprove its cleansing capability.

5. Pour the cleaning solution into the sprayer. If a high-pressure sprayer is used:

a. do not allow sprayer pressure to exceed 600 psi.

b. the minimum nozzle spray angle is 15 degrees.

c. maintain a minimum clearance of 6" between thesprayer nozzle and the coil.

d. spray the solution perpendicular (at 90 degrees) tothe coil face.

6. Spray the leaving-airflow side of the coil first; thenspray the opposite side of the coil. Allow the cleaningsolution to stand on the coil for five minutes.

NOTICE:

Coil Damage!

DO NOT use any detergents with microchannelcondenser coils. Use pressurized water or air ONLY,with pressure no greater than 600psi. Failure to do socould result in coil damage.

For additional information regarding the propermicrochannel coil cleaning procedure, refer to RT-SVB83*-EN.

WARNING

Hazardous Chemicals!

Coil cleaning agents can be either acidic or highlyalkaline and can burn severely if contact with skinoccurs. Handle chemical carefully and avoid contactwith skin. ALWAYS wear Personal Protective Equipment(PPE) including goggles or face shield, chemicalresistant gloves, boots, apron or suit as required. Forpersonal safety refer to the cleaning agentmanufacturer’s Materials Safety Data Sheet and followall recommended safe handling practices. Failure tofollow all safety instructions could result in death orserious injury.

WARNING

Hazardous Pressures!

Coils contain refrigerant under pressure.When cleaningcoils, maintain coil cleaning solution temperatureunder 150°F to avoid excessive pressure in the coil.Failure to follow these safety precautions could resultin coil bursting, which could result in death or seriousinjury.

38 RT-SVX46C-EN

Maintenance

7. Rinse both sides of the coil with cool, clean water.

8. Inspect both sides of the coil; if it still appears to bedirty, repeat Step 6 and Step 7.

9. Reinstall all of the components and panels removed inStep 1 and any protective covers installed in Step 2.

Note: For units equipped with hail guards followreinstallation procedure listed below.

Hail Guard Reinstallation

10. To reinstall the hail guard, locate the bottom of the hailguard in the lower bracket and secure it to the upperunit bracket with the attached fasteners.

Note: Secure hail guard latches.

11. Restore the unit to its operational status and checksystem operation.

Annual Maintenance

• Clean and repaint any corroded surface.

Final Process

For future reference, you may find it helpful to record theunit data requested in the blanks provided.

Note: Check and record the data requested above eachmonth during the cooling season with the unitrunning.

Figure 33. Hail guard

Complete Model Number:

Unit Serial Number:

Wiring Diagram Numbers(from unit control panel):

Connections:

Schematics:

Table 9. Sample maintenance log

Refrigerant Circuit #1

Date

CurrentAmbientTemp.

F/C

Compr.Oil

Level

Suct.Press.Psig/kPa

Disch.Press.Psig/kPa

LiquidPress.Psig/kPa

Super-heatF/C

Sub-cool.F/C

- ok- low

- ok- low

- ok- low

- ok\- low

- ok- low

RT-SVX46C-EN 39

Troubleshooting

ReliaTel™ Control

The RTRM has the ability to provide the service personnelwith some unit diagnostics and system status information.

Before turning the main power disconnect switch “Off”,follow the steps below to check the ReliaTel RefrigerationModule (RTRM). All diagnostics & system statusinformation stored in the RTRM will be lost when the mainpower is turned “Off”.


1. Verify LED on face of the phase monitor is green. If LEDis red, correct supply power fault.

2. Verify that the Liteport LED on the RTRM is burningcontinuously. If the LED is lit, go to Step 3.

3. If the LED is not lit, verify that 24 VAC is presencebetween J1-1 and J1-2. If 24VAC is present, proceed toStep 4. If 24 VAC is not present, check the unit mainpower supply, check transformer (TNS1). Proceed toStep 4 if necessary.

4. Utilizing “Method 1” or “Method 2” in the “SystemStatus Diagnostic” section, check the following:

• System status

• Heating status

• Cooling status

If a system failure is indicated, proceed to Step 5. If nofailures are indicated, proceed to Step 6.

5. If a System failure is indicated, recheck Step 2 and Step3. If the LED is not lit in Step 2, and 24 VAC is presentin Step 3, the RTRM has failed. Replace the RTRM.

6. If no failures are indicated, use one of theTEST modeprocedures described in the “Unit Start-Up” section tostart the unit.This procedure will allow you to check allof the RTRM outputs, and all of the external controls(relays, contactors, etc.) that the RTRM outputsenergize, for each respective mode. Proceed to Step 7.

7. Step the system through all of the available modes,and verify operation of all outputs, controls, andmodes. If a problem in operation is noted in any mode,

you may leave the system in that mode for up to onehour while troubleshooting. Refer to the sequence ofoperations for each mode, to assist in verifying properoperation. Make the necessary repairs and proceed toStep 8 and Step 9.

8. If no abnormal operating conditions appear in the testmode, exit the test mode by turning the power “Off” atthe main power disconnect switch.

9. Refer to the individual component test procedures ifother microelectronic components are suspect.

System Status Checkout

Procedure

“System Status” is checked by using one of the followingtwo methods:

Method 1

If the Zone Sensor Module (ZSM) is equipped with aremote panel with LED status indication, you can check theunit within the space. If the ZSM does not have LED’s, useMethod 2. BAYSENS110*, BAYSENS109*, BAYSENS119*,BAYSENS023A all have the remote panel indicationfeature.The LED descriptions are listed below.

Zone Sensor LED 1 (System)

“On” during normal operation.

“Off” if a system failure occurs or the LED fails.

“Flashing” indicates test mode.

Zone Sensor LED 2 (Heat)

“On” when the heat cycle is operating.

“Off” when the heat cycle terminates or the LED fails.

“Flashing” indicates a heating failure.

Zone Sensor LED 3 (Cool)

“On” when the cooling cycle is operating.

“Off” when the cooling cycle terminates or the LED fails.

“Flashing” indicates a cooling failure.

Zone Sensor LED 4 (Service)

“On” indicates a clogged filter.

“Off” during normal operation.

“Flashing” indicates an evaporator fan or condensateoverflow switch failure.

Below is the complete listing of failure indication causes.

System failure

Check the voltage between terminals 6 and 9 on J6, itshould read approximately 32 VDC. If no voltage ispresent, a system failure has occurred. Refer to Step 4 in

WARNING



40 RT-SVX46C-EN

Troubleshooting

the previous section for the recommendedtroubleshooting procedure.

Heating Failure

Verify Heat Failure by Ignition Module (IGN) LED indicator:

OFF: No Power or Failure

ON: Normal

Slow Flash: Normal, Heat Call

Fast Flash: Error Code:

1 Flash: Communication Failure

2 Flashes: System Lockout

3 Flashes: Pressure Switch Fail

4 Flashes:TC01 orTC02 Open

5 Flashes: Flame w/o Gas Valve

6 Flashes: Flame Rollout Open

Cooling Failure

• Cooling and heating set point (slide pot) on the zonesensor has failed. Refer to the “Zone SensorTestProcedure” section.

• Zone temperature thermistor ZTEMP on ZTS failed.Refer to the “Zone SensorTest Procedure” section.

• CC1 or CC2 24 VAC control circuit has opened, checkCC1 & CC2 coils, and any of the controls below thatapply to the unit (HPC1, HPC2).

• LPC1 has opened during the 3 minute minimum “ontime” during 4 consecutive compressor starts, checkLPC1 or LPC2 by testing voltage between the J1-1 & J3-2 terminals on the RTRM and ground. If 24 VAC ispresent, the LPC’s has not tripped. If no voltage ispresent, LPC’s has tripped.

Service Failure

• If the supply fan proving switch has closed, the unit willnot operate (when connected to RTOM), check the fanmotor, belts, and proving switch.

• Clogged filter switch has closed, check the filters.

• If the condensate overflow switch is closed, the unitwill not operate. Make sure the float switch is not in atripped condition, and check for an “open” betweenwires connecting to RTOM J6-1, J6-2 (ReliaTel™controls).

Simultaneous Heat and Cool Failure

• Emergency Stop is activated

Method 2

The second method for determining system status is doneby checking voltage readings at the RTRM (J6).The systemindication descriptions and the approximate voltages arelisted below.

System Failure

• Measure the voltage between terminals J6-9 & J6-6.

• Normal Operation = approximately 32 VDC

• System Failure = less than 1 VDC, approximately 0.75VDC

• Test Mode = voltage alternates between 32VDC & 0.75VDC

Heat Failure


• Heat Operating = approximately 32 VDC

• Heat Off = less than 1 VDC, approximately 0.75 VDC

• Heating Failure = voltage alternates between 32VDC &0.75 VDC

Cool Failure


• Cool Operating = approximately 32 VDC

• Cool Off = less than 1 VDC, approximately 0.75 VDC

• Cooling Failure = voltage alternates between 32VDC &0.75 VDC

Service Failure


• Clogged Filter = Approximately 32 VDC.

• Normal = Less than 1 VDC, approximately 0.75 VDCFan Failure = voltage alternates between 32VDC & 0.75VDC.

To use LED’s for quick status information at the unit,purchase a BAYSENS110* ZSM and connect wires withalligator clamps to terminals 6 through 10. Connected eachrespective terminal wire (6 through 10) from the ZoneSensor to the unit J6 terminals 6 through 10.

Note: If the system is equipped with a programmablezone sensor, BAYSENS119* the LED indicators willnot function while the BAYSENS110* is connected.

Resetting Cooling and Ignition Lockouts

Cooling Failures and Ignition Lockouts are reset in anidentical manner. Method 1 explains resetting the systemfrom the space; Method 2 explains resetting the system atthe unit.

Note: Before resetting Cooling Failures and IgnitionLockouts check the Failure Status Diagnostics bythe methods previously explained. Diagnostics willbe lost when the power to the unit is disconnected.

Method 1

To reset the system from the space, turn the “Mode”selection switch at the zone sensor to the “Off” position.After approximately 30 seconds, turn the “Mode”

RT-SVX46C-EN 41

Troubleshooting

selection switch to the desired mode, i.e. Heat, Cool orAuto.

Method 2

To reset the system at the unit, cycle the unit power byturning the disconnect switch “Off” and then “On”.

Lockouts can be cleared through the buildingmanagement system. Refer to the building managementsystem instructions for more information.

ZoneTemperature Sensor (ZTS) ServiceIndicator

The ZSM SERVICE LED is a generic indicator, that willsignal the closing of a Normally Open switch at any time,providing the Indoor Motor (IDM) is operating.Thisindicator is usually used to indicate a clogged filter, or anair side fan failure.

The RTRM will ignore the closing of this Normally Openswitch for 2 (±1) minutes.This helps prevent nuisanceSERVICE LED indications.The exception is the LED willflash 40 seconds after the fan is turned “On” if the FanProving Switch is not made.

Clogged Filter Switch

This LED will remain lit the entire time that the NormallyOpen switch is closed.The LED will be turned offimmediately after resetting the switch (to the NormallyOpen position), or any time that the IDM is turned “Off”.

If the switch remains closed, and the IDM is turned “On”,the SERVICE LED will be turned “On” again after the 2 (±1)minute ignore delay.

This LED being turned “On”, will have no other affect onunit operation. It is an indicator only.

Fan Failure Switch

When the “Fan Failure” switch is wired to the RTOM, theLED will remain flashing the entire time the fan provingswitch is closed, indicating a fan failure, and it will shut theunit operations down.

Condensate Overflow Switch

When the “Condensate Overflow Switch” is closed, adrain pan overflow condition is indicated and it will shutunit operations down.

ZoneTemperature Sensor (ZTS)Tests

Note: These procedures are not for programmable ordigital models and are conducted with the ZoneSensor Module electrically removed from thesystem.

Test 1 - ZoneTemperatureThermistor (ZTEMP)

This component is tested by measuring the resistancebetween terminals 1 and 2 on the ZoneTemperature

Sensor. Below are some typical indoor temperatures, andcorresponding resistive values.

Test 2 - Cooling Set Point (CSP) and Heating

Set Point (HSP)

The resistance of these potentiometers are measuredbetween the following ZSM terminals. Refer to the chartabove for approximate resistances at the given setpoints.

Cool SP =Terminals 2 and 3

Range = 100 to 900 Ohms approximate

Heat SP =Terminals 2 and 5

Range = 100 to 900 Ohms approximate

Test 3 - System Mode and Fan Selection

The combined resistance of the Mode selection switch andthe Fan selection switch can be measured betweenterminals 2 and 4 on the Zone Sensor.The possible switchcombinations are listed below with their correspondingresistance values.

Test 4 - LED IndicatorTest, (SYS ON, HEAT,COOL & SERVICE)

Method 1. Testing the LED using a meter with diode testfunction.Test both forward and reverse bias. Forward biasshould measure a voltage drop of 1.5 to 2.5 volts,depending on your meter. Reverse bias will show an OverLoad, or open circuit indication if LED is functional.

Method 2. Testing the LED with an analog Ohmmeter.Connect Ohmmeter across LED in one direction, thenreverse the leads for the opposite direction.The LEDshould have at least 100 times more resistance in reversedirection, as compared with the forward direction. If highresistance in both directions, LED is open. If low in bothdirections, LED is shorted.

Method 3. To test LED’s with ZSM connected to unit, testvoltages at LED terminals on ZSM. A measurement of 32VDC, across an unlit LED, means the LED has failed.

Table 10. Cooling setpoint and heating setpoint

Zone TemperatureNominal ZTEMP

Resistance

50°F 10.0°C 19.9 K-Ohms

55°F 12.8°C 17.47 K-Ohms

60°F 15.6°C 15.3 K-Ohms

65°F 18.3°C 13.49 K-Ohms

70°F 21.1°C 11.9 K-Ohms

75°F 23.9°C 10.50 K-Ohms

80°F 26.7°C 9.3 K-Ohms

85°F 29.4°C 8.25 K-Ohms

90°F 32.2°C 7.3 K-Ohms

42 RT-SVX46C-EN

Troubleshooting

Relative Humidity SensorTest

This component is measured by measuring the mA outputsignal on the Relative Humidity Sensor.Verify accuracy ofthe sensor annually. If the output reading is 0 mA, firstverify that power is applied to the sensor. A reading of 4mA corresponds to 0% RH and 20 mA corresponds to 100%RH.

Note: Measurements should be made from LED common(ZSM terminal 6 to respective LED terminal). Referto the Zone Sensor Module (ZSM)TerminalIdentification table at the beginning of this section.

Programmable & Digital Zone SensorTest

Testing serial communication voltage

1. Verify 24VAC is present between terminals J6-14 & J6-11.

2. Disconnect wires from J6-11 and J6-12. Measure thevoltage between J6-11 and J6-12, should be about 32VDC.

3. Reconnect wires to terminals J6-11 and J6-12. Measurevoltage again between J6-11 and J6-12, voltage shouldflash high and low every 0.5 seconds.The voltage onthe low end will measure about 19 VDC, while thevoltage on the high end will measure fromapproximately 24 to 38 VDC.

4. Verify all modes of operation, by running the unitthrough all of the steps in the “Test Modes” sectiondiscussed in “Unit Start-Up”.

5. After verifying proper unit operation, exit the testmode.Turn the fan on continuously at the ZSM, bypressing the button with the fan symbol. If the fancomes on and runs continuously, the ZSM is good. Ifyou are not able to turn the fan on, the ZSM isdefective.

ReliaTel™ Refrigeration Module (RTRM)Default Chart

If the RTCI loses input from the building managementsystem, the RTRM will control in the default mode afterapproximately 15 minutes. If the RTRM loses the Heatingand Cooling setpoint input, the RTRM will control in thedefault mode instantaneously.The temperature sensingthermistor in the Zone Sensor Module is the onlycomponent required for the “Default Mode” to operate.

Unit Operation without a Zone Sensor

This procedure is for temporary operation only.Theeconomizer and condenser fan cycling functions aredisabled.

1. Open and Lock the unit disconnect switch.

2. Remove the Outside Air Sensor (OAS) from thecondenser section of unit.

3. Use two (2) wire nuts, to individually cap the wires.

4. Locate the RTRM (J6). Connect two (2) wires toterminals J6-1 and 2.

5. Connect the sensor (OAS) using two wire nuts to thetwo (2) field supplied wires that were connected toterminals 1 and 2 on J6.

% RH mA

30 8.8

40 10.4

50 12.0

60 13.6

70 15.2

80 16.8

WARNING

Hazardous Voltage!


RT-SVX46C-EN 43

Troubleshooting

Unit Economizer Control (ECA)

Troubleshooting

ReliaTel™ Control

Verify Economizer Status by Economizer Actuator (ECA)LED indicator:

• OFF: No power or failure

• ON: Normal, OK to economize

• Slow Flash: Normal, not OK to economize

• Fast Flash - 1/2 second on / 2 seconds off:

• Error Code: Communications failure

• Pulse Flash:2 seconds on / 1/2 second off:

• Error Code:

• 1 Flash: Actuator Fault

Table 11. Fault detection and diagnostic codes

Primary Fault Codes Information Code

Failures

Mixed Air Temp

Sensor Fail

Outdoor Temp

Sensor Fail

Economizer Actuator

Fault

RTEM Comm

Fail

Pressure Dead band

Fail (If Used)

Temp Sensor

Fail (If Used)

Airflow Sensor Fail (If Used)

Space Press Dead band Fail (If Used)

Unit Fails to

Economize

Unit Economizing

When It Should Not

Damper Position % Indicated

Damper stuck at Minimum X X(a) X(a)* X(a) X X

Damper Stuck Open X X(a) X(a) X(a) X X

Mixed Sensor Failure X X

Supply Air Sensor Failure X X

Outdoor Air Temperature Fail

X X

Power loss to RTEM X

Failed or Power Loss to Actuator

X X

Mechanical Failure of Actuator

X

(a) If goes out of range.

Table 12. Low leak economizer sensor values

Sensor Values Data

Temp °FResistance (K ohms) Temp °F

Resistance(K ohms) Temp °F

Resistance (K ohms)

40 26.097 54 17.847 68 12.435

41 25.383 55 17.382 69 12.126

42 24.690 56 16.930 70 11.827

43 24.018 57 16.491 71 11.535

44 23.367 58 16.066 72 11.252

45 22.736 59 15.654 73 10.977

46 22.132 60 15.253 74 10.709

47 21.530 61 14.864 75 10.448

48 20.953 62 14.486 76 10.194

49 20.396 63 14.119 77 9.949

50 19.854 64 13.762 78 9.710

51 19.330 65 13.416 79 9.477

52 18.821 66 13.078 80 9.250

53 18.327 67 12.752 81 9.030

44 RT-SVX46C-EN

Troubleshooting

• 2 Flashes: CO2 Sensor

• 3 Flashes: RA Humidity Sensor

• 4 Flashes: RATemp Sensor

• 5 Flashes: OA Quality Sensor

• 6 Flashes: OA Humidity Sensor

• 7 Flashes: OATemp Sensor

• 8 Flashes: MATemp Sensor

• 9 Flashes: RAM Fault

• 10 Flashes: ROM Fault

• 11 Flashes: EEPROM Fault

Heating Failure

Verify Heat Failure by Ignition Module (IGN) LED indicator:

• OFF: No Power or Failure

• ON: Normal

• Slow Flash: Normal, Heat Call

• Fast Flash: Error Code:

1 Flash: No Communication

2 Flashes: System Lockout

3 Flashes: Pressure Switch Fail

4 Flashes:TC01 orTC02 Open

5 Flashes: Flame w/o Gas Valve

6 Flashes: Flame Rollout Open

Cooling Failure

• Cooling and heating set point (slide pot) on thethermostat has failed.

• CC1 or CC2 24 VAC control circuit has opened, checkCC1 & CC2 coils, and any of the controls below thatapply to the unit (HPC1, HPC2, LPC1, LPC2, Frostat™).

Resetting Cooling and Ignition Lockouts

Cooling failures and ignition lockouts are reset in anidentical manner. Method 1 explains resetting the systemfrom the space; Method 2 explains resetting the system atthe unit.

Method 1

To reset the system from the space, turn the “Mode”selection switch at the thermostat to the “Off” position.After approximately 30 seconds, turn the “Mode”selection switch to the desired mode, i.e. Heat, Cool orAuto.

Method 2

To reset the system at the unit, cycle the unit power byturning the disconnect switch “Off” and then “On”.

Compressor Inverter Drive

Refer to RT-SVD05*-EN (for VF-S15 inverters, refer to RT-SVD007*-EN) for compressor inverter drivetroubleshooting information.

RT-SVX46C-EN 45

46 RT-SVX46C-EN

Unit Wiring Diagrams Numbers

Note: Wiring diagrams can be accessed using e-Libraryby entering the diagram number in the literatureorder number search field or by contactingtechnical support.

Table 13. Unit wiring diagram numbers

Schematic Type Drawing Number Description

Control ReliaTel™ 208-230/460V4366-8324-0110 Diagram Controls YZC(036E, 048F, 060E4) -

Ultra High Efficiency1213-1655-0001 Diagram Controls YZC060E3 Ultra High Efficiency


Power ReliaTel™

460V 4366-8316-0110 Diagram Power YZC(036E, 048F, 060E)4 - Ultra High Efficiency - Variable Speed Comp

208/230V4366-8318-0110 Diagram Power YZC(036E, 048F)3 -

Ultra High Efficiency - Variable Speed Comp

1213-1654-0001 Diagram Power YZC(060E3) Ultra High Efficiency - Variable Speed Comp


Connection ReliaTel™

208/230V 4366-8508-0110 Diagram Connection Print - YZC036E3

460V 4366-8509-0110 Diagram Connection Print - YZC036E4

208/230V4366-8510-0110 Diagram Connection Print - YZC(048F3)4366-8968-0110 Diagram Connection Print YZC060E3

460V 4366-8511-0110 Diagram Connection Print - YZC(048F4,060E4)

RT-SVX46C-EN 47

Limited Warranty

Combination Gas Electric Air

Conditioner

YZC (Parts Only)

Models LessThan 20Tons for CommercialUse*

This warranty is extended byTrane to the originalpurchaser and to any succeeding owner of the realproperty to which the Combination Gas Electric AirConditioner is originally affixed, and applies to productspurchased and retained for use within the U.S.A. andCanada.There is no warranty against corrosion, erosion ordeterioration.

If any part of your Combination Gas Electric AirConditioner fails because of a manufacturing defect withinone year from the date of the original purchase,Warrantorwill furnish without charge the required replacement part.Any local transportation, related service labor, diagnosiscalls, air filters, refrigerant and related items are notincluded.

In addition, if the sealed motor-compressor fails becauseof a manufacturing defect within the second through fifthyear from the date of original purchase, Warrantor willfurnish without charge the required replacementcompressor. Any local transportation, related servicelabor, diagnosis calls, refrigerant and related items are notincluded.

In addition, if the optional, factory installed, stainless steelheat exchanger fails because of a manufacturing defectwithin ten years from the date of start-up, Warrantor willfurnish without charge a replacement heat exchanger. Ifthe steel heat exchanger fails because of a manufacturingdefect within the second through fifth year from the dateof original purchase, Warrantor will furnish withoutcharge a replacement heat exchanger. In either case, anylocal transportation, related service labor and diagnosiscalls are not included.

This limited warranty does not cover failure of yourcombination gas electric air conditioner if it is damagedwhile in your possession, failure attributable or caused byunreasonable use of the combination gas electric airconditioner and/or failure to properly maintain thecombination gas electric air conditioner as set forth in theInstallation, Operation, and Maintenance manual.

Warrantor’s obligations and liabilities under this warrantyare limited to furnishing F.O.B. Warrantor factory orwarehouse at Warrantor designated shipping point,freight allowed to Buyer’s city, replacement parts forWarrantor’s products covered under this warranty.Warrantor shall not be obligated to pay for the cost of lostrefrigerant. No liability shall attach to Warrantor untilproducts have been paid for and then liability shall be

limited solely to the purchase price of the equipmentunder warranty shown to be defective.

THEWARRANTY AND LIABILITY SET FORTH HEREIN AREIN LIEU OF ALL OTHER WARRANTIES AND LIABILITIES,

WHETHER IN CONTRACT OR IN NEGLIGENCE, EXPRESSOR IMPLIED, IN LAW OR IN FACT, INCLUDING IMPLIEDWARRANTIES OF MERCHANTABILITY AND FITNESS FORPARTICULAR USE, AND IN NO EVENT SHALLWARRANTOR BE LIABLE FOR ANY INCIDENTAL ORCONSEQUENTIAL DAMAGES.

Some states do not allow limitations on how long animplied warranty lasts or do not allow the exclusion orlimitation of incidental or consequential damages, so theabove limitation or exclusion may not apply to you.Thiswarranty gives you specific legal rights, and you may alsohave other rights which vary from state to state.

Trane

2701 Wilma Rudolph Blvd.

Clarksville,TN 37040-1008

Attention: Manager, Product Service

GW-606-4800

*This warranty is for commercial usage of said equipmentand not applicable when the equipment is used for aresidential application. Commercial use is any applicationwhere the end purchaser uses the product for other thanpersonal, family or household purposes.

**A 5 year limited warranty is provided for the optional“Low Leak” economizer when combined with theadditional FDD (Fault Detection & Diagnostics) option.

The manufacturer optimizes the performance of homes and buildings around the world. A business of Ingersoll Rand,the leader in creating and sustaining safe, comfortable and energy efficient environments,the manufacturer offers abroad portfolio of advanced controls and HVAC systems, comprehensive building services, and parts. For moreinformation, visit www.IRCO.com.

The manufacturer has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice.

We are committed to using environmentally

conscious print practices that reduce waste.

© 2015Trane All rights reserved

RT-SVX46C-EN 07 Aug 2015

Supersedes RT-SVX46B-EN (18 May 2015)

installation, operation, and maintenance · 11. standard onyzc 4 ton models. 12. epoxy coil and...

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