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PKG-SVX14A-EN

Installation, Operation, and

Maintenance

Midrange Self-Contained Units

August 2004

Models SCWH/SIWH/SCRH/SIRH

3, 5, 7.5, 10, 12, & 15-tons

“AO” and later design sequence

2 PKG-SVX14A-EN

generalinformation

About This Manual

Literature Change History

Use this manual for commercial self-contained models SCWH, SIWH, SCRH,and SIRH. This is the original issue of thismanual. It provides specific installation,owner maintenance, and diagnostictroubleshooting instructions for “AO” andlater design sequences.

Note: The procedures discussed in thismanual should only be performed byqualified, experienced HVAC technicians.

Note: This document is customerproperty and must be retained for use bymaintenance personnel.

It is important to perform periodicmaintenance to help ensure trouble freeoperation. Should equipment failureoccur, contact a qualified Trane serviceorganization for an experienced HVACtechnician to properly diagnose andrepair this equipment.

Warnings and Cautions

Warnings and cautions appear atappropriate sections throughout thismanual. Read these carefully.

WARNINGIndicates a potentially hazardoussituation, which could result in deathor serious injury if not avoided.

CAUTIONIndicates a potentially hazardoussituation, which may result in minor ormoderate injury if not avoided. Also, itmay alert against unsafe practices.

CAUTIONIndicates a situation that may result inequipment or property-damage-onlyaccidents.

Example Warnings andCautions

WARNINGHazardous Voltage!Disconnect all electric power,including remote disconnects beforeservicing.Follow proper lockout/tagoutprocedures to ensure power cannotbe inadvertently energized. Failure todisconnect power before servicingcould result in death or serious injury.

CAUTIONUse Copper Conductors Only!Unit terminals are not designed toaccept other type conductors. Failureto use copper conductors may resultin equipment damage.

Common HVAC AcronymsFor convenience, a number of acronymsand abbreviations are used throughoutthis manual. These acronyms arealphabetically listed and defined below.CFM = Cubic-feet-per-minuteCKT. = CircuitCV = Constant volumeCW = ClockwiseCCW = CounterclockwiseE/A = Exhaust airF/A = Fresh airHGBP = Hot gas bypassHVAC = Heating, ventilation and airconditioningIGV = Inlet guide vanesI/O = Inputs/outputsIOM= Installation/operation/maintenancemanualLH = Left-handO/A = Outside airpsig = Pounds-per-square-inch, gaugepressureR/A = Return airRH = Right-handRPM = Revolutions-per-minuteS/A = Supply airSZ = Single-zone (unit airflow)VAV = Variable air volumew.c. = Water column

Special Note on RefrigerationEmissions

World environmental scientists haveconcluded that ozone in our upperatmosphere is being reduced due to therelease of CFC fully halogenatedcompounds.

Trane urges all HVAC service personnelto make every effort to prevent anyrefrigerant emissions while installing,operating, or servicing equipment.Always conserve refrigerants forcontinued use.

© 2004 American Standard Inc.

PKG-SVX14A-EN 3

contents

Cross reference to related publications/information:Midrange Self-Contained catalog, PKG-PRC012-EN

Installation…………………………………………………2

general information ……………………………………………2pre-installation considerations ………………………………6dimensions & weights ………………………………………11mechanical requirements ……………………………………17electrical requirements ………………………………………19 installation procedure ………………………………………21pre-startup requirements ……………………………………22

startup …………………………………………………………23

Operation…………………………………………………24

sequence of operation ………………………………………24

Maintenance ……………………………………………25

general information …………………………………………25maintenance procedures ……………………………………26periodic checklists ……………………………………………29troubleshooting ………………………………………………30typical wiring diagrams ……………………………………32

4 PKG-SVX14A-EN

Installationgeneralinformation

Midrange Model Number Description

Following is a complete description of the midrange model number. Each digit in the model number has a corresponding code thatidentifies specific unit options.

S C W H 075 4 2 A0 1 0 1 01 2 3 4 567 8 9 1011 12 13 14 15

Digit 1 - unit modelS = self contained

Digit 2 - unit typeC = commercialI = industrial

Digit 3 - condenser mediumR = remote air-cooledW = water cooled

Digit 4 - development sequenceH = development series

Digit 5, 6, 7- unit nominal capacity030 = 3 tons050 = 5 tons075 = 7.5 tons100 = 10 tons120 = 12 tons150 = 15 tons

Digit 8 - unit voltage3 = 208 - 230 volt/60 hz/3 ph4 = 460 volt/60 hz/3 ph5 = 575 volt/60 hz/3 ph

Digit 9 - air flow configuration2 = vertical discharge / front return3 = vertical discharge / rear return

Digit 10, 11 - design sequenceA0 = design sequence

Digit 12 - air filter type1 = one-inch fiberglass throwaway

Digit 13 - control0 = control interface

Digit 14 - unit finish1 = painted2 = corrosion resistant coating

Digit 15 - coil finish0 = noneE = evaporator coated

Unit Airflow Configurations

unit size discharge fan location comments

! 030/050/075 vertical CCW top standard" horizontal CW top field converted

# 100/120/150 vertical CCW top standard

$ vertical CW top field converted% horizontal CW top& vertical CW rear' horizontal CW rear( horizontal CCW rear

PKG-SVX14A-EN 5

Installationgeneralinformation

General

The midrange models SCWH/SCRH/SIWH/SIRH is a high efficiency, vertical aircondioner. units have either front or topdischarge configuration options and easyservice access. Unit construction is heavygage steel with a baked enamel finish.Available unit voltages are 208/3/60, 230/3/60, 460/3/60, and 575/3/60.

Refrigeration CircuitsUnits are configured in single or doublerefrigeration circuits. Each circuit consistsof:• high efficiency scroll compressor

mounted on rubber isolation grommets• evaporator coils designed for optimum

performance and efficiency with lancedfins and rifled tubing

• filter-drier

Evaporator SectionThe evaporator fan section consists ofone or two forward curved centrifugalfans powered by a premium efficiencymotor through an adjustable motorsheave and fixed diameter blower pulley.

ControlsThe standard control panel consists of ahigh voltage terminal block, overloadrelays for each fan motor, transformer, 3-pole 24-volt contactors for eachmotorand compressor, and a 5-second delaytimer. Remote thermostat controls arefield installed.

Field-Installed AccesoriesThese items ship separately for fieldinstallation:• steam coil• hot water coil• plenum• oversized motors• remote thermostat

Note: Application of the above optionsand/or accessories may require fieldadjustment of fan speeds to ensureproper airflow and performance.

Unit NameplateThe unit nameplate identifies the unitmodel number, appropriate serviceliterature, and wiring diagrm numbers. Itis mounted on the control panel door.Reference this information when makinginquires or ordering parts or literature.

Refrigerant HandlingProcedures

Environmental Accountability PolicyTrane urges that all HVAC servicers tomake every effort to eliminate, if possible,or vigorously reduce the emission of CFC,HCFC, and HFC refrigerants to theatmosphere. Always act in a responsiblemanner to conserve refrigerants forcontinued usage even when acceptablealternatives are available.

Recover and Recycle RefrigerantsNever release refrigerant to theatmosphere! Always recover and/orrecycle refrigerant for reuse,reprocessing (reclaimed), or properlydispose if removing from equipment.Always determine the recycle or reclaimrequirements of the refrigerant beforebeginning the recovery procedure.Obtain a chemical analysis of therefrigerant if necessary. Questions aboutrecovered refrigerant and acceptablerefrigerant quality standards areaddressed in ARI Standard 700.

Refrigerant Handling and SafetyConsult the manufacturer’s materialsafety data sheet (MSDS) for informationon refrigerant handling to fullyunderstand health, safety, storage,handling, and disposal requirements. Usethe approved containment vessels andrefer to appropriate safety standards.Comply with all applicable transportationstandards when shipping refrigerantcontainers.

Service Equipment and ProceduresTo minimize refrigerant emissions whilerecovering refrigerant, use themanufacturer’s recommended recyclingequipment per the MSDS. Useequipment and methods which will pullthe lowest possible system vacuum whilerecovering and condensing refrigerant.Equipment capable of pulling a vacuum ofless than 1,000 microns of mercury isrecommended.

Do not open the unit to the atmospherefor service work until refrigerant is fullyremoved/recovered. When leak-testingwith trace refrigerant and nitrogen, useHCFC-22 (R-22) rather than CFC-12 (R-12) or any other fully-halogenatedrefrigerant . Be aware of any new leaktest methods which may eliminate

refrigerants as a trace gas. Performevacuation prior to charging with avacuum pump capable of pulling avacuum of 1,000 microns of mercury orless. Let the unit stand for 12 hours andwith the vacuum not rising above 2,500microns of mercury.

A rise above 2,500 microns of mercuryindicates a leak test is required to locateand repair any leaks. A leak test isrequired on any repaired area.

Charge refrigerant into the equipmentonly after equipment does not leak orcontain moisture. Reference properrefrigerant charge requirements in themaintenance section of this manual toensure efficient machine operation.When charging is complete, purge ordrain charging lines into an approvedrefrigerant container. Seal all usedrefrigerant containers with approvedclosure devices to prevent unusedrefrigerant from escaping to the atmo-sphere. Take extra care to properlymaintain all service equipment directlysupporting refrigerant service work suchas gauges, hoses, vacuum pumps, andrecycling equipment .

When cleaning system components orparts, avoid using CFC-11 (R-11) or CFC-113 (R-113). Use only cleaning-solventsthat do not have ozone depletion factors.Properly dispose of used materials.Refrigeration system cleanup methodsusing filters and driers are preferred.Check for leaks when excessive purgeoperation is observed.

Keep abreast of unit enhancements,conversion refrigerants, compatibleparts, and manufacturer’s recommenda-tions that will reduce refrigerant emis-sions and increase equipment operatingefficiencies.

6 PKG-SVX14A-EN

Pre-Installation Considerations

Pre-Installation ChecklistComplete the following checklist beforebeginning unit installation.) Verify the unit size and tagging with the

unit nameplate. ) Make certain the floor or foundation is

level, solid, and sufficient to support theunit and accessory weights. Level orrepair the floor before positioning theunit if neccesary.

) Allow minimum recommendedclearances for routine maintenance andservice. Refer to unit submittals fordimensions.

) Allow three fan diameters above theunit for the discharge ductwork. Returnair enters the rear of the unit andconditioned supply air dischargesthrough the top.

) Electrical connection knockouts are onthe top, left side of the unit.

) Allow adequate space for pipingaccess and panel removal. Condenserwater piping, refrigerant piping, andcondensate drain connections are onthe lower left end panel.

) Electrical supply power must meetspecific balance and voltagerequirements as described in the“Electrical Requirements” section.

) Water-cooled units only: The installeris responsible for providing a condensermain, standby water pump, coolingtower, pressure gauges, strainers, andall components for waterside piping.See the “Water Piping” section forgeneral waterside recommendations.

) Air-cooled units only: The installer isresponsible for providing and installingthe remote air-cooled condenser andrefrigerant piping, including filter driers.

Receiving and Handling

Shipping PackageMidrange units ship assembled on skids.Units ship assembled, piped, and chargedwith either R410a (models SCWH/SIWH)or a dry nitrogen charge (models SCRH/SIRH).

Receiving ChecklistComplete the following checklistimmediately after receiving unitshipment to detect possible shippingdamage.)) Inspect individual cartons before

accepting. Check for rattles, bent cartoncorners, or other visible indications ofshipping damage.

) If a unit appears damaged, inspect itimmediately before accepting theshipment. Make specific notationsconcerning the damage on the freightbill. Do not refuse delivery.

) Inspect the unit for concealed damagebefore it is stored and as soon aspossible after delivery. Reportconcealed damage to the freight linewithin the allotted time after delivery.Check with the carrier for their allottedtime to submit a claim.

) Do not move damaged material fromthe receiving location. It is the receiver’sresponsibility to provide reasonableevidence that concealed damage didnot occur after delivery.

) Do not continue unpacking theshipment if it appears damaged. Retainall internal packing, cartons, and crate.Take photos of damaged material ifpossible.

) Notify the carrier’s terminal of thedamage immediately by phone andmail. Request an immediate jointinspection of the damage by the carrierand consignee.

) Notify your Trane representative ofthe damage and arrange for repair.Have the carrier inspect the damagebefore making any repairs to the unit.

Unit StorageTake precautions to prevent condensatefrom forming inside the electricalcompartments and motors if the unit isstored before it is installed.

Service AccessMaintain adequate clearances aroundand above the unit to ensure proper unitoperationa nd allow sufficient serviceaccesss. Trane recommends 36-inchesservice access on all sides fo the unit.Service access locations are shown infigures on pages 8 through 9.

WARNINGHazardous Voltage!Disconnect all electric power, includingremote disconnects before servicing.Follow proper lockout/tagoutprocedures to ensure power cannotbe inadvertently energized. Failure todisconnect power before servicingcould result in death or serious injury.

Installation Preparation

Before installing the unit, perform thefollowing procedures to ensure properunit operation.1. Verify the floor or foundation is level.

Shim or repair as necessary. To ensureproper unit operation, install the unitlevel in both horizontal axes.

2. Allow adequate service and codeclearances as recommended in“Service Access” section. Position theunit and skid assembly in its finallocation. Test lift the unit to determineexact unit balance and stability beforehoisting it to the installation location.See the “Proper Lifting Procedure”section for proper rigging proceduresand cautions.

3. Remove the skids from under the unit.If you find internal damage, file a claimimmediately to the delivering carrier.

4. Remove the protective shipping coversfrom the unit.

5. Verify the compressor isolator shippingbrackets are removed and the isolatorsare properly tightened for operation.

Installationpre-installationconsiderations

PKG-SVX14A-EN 7


24"

FAN ACCESS

FRONT RETURN

COIL / ELECTRIC HEATER ACCESS

MOTOR / DRIVE ACCESS(RIGHT SIDE)

CONTROL BOX & CONDENSER FAN ACCESS

TXV ACCESS(RIGHT SIDE)

26" SERVICE CLEARANCERIGHT SIDE

UNIT-MOUNTED T-STATOPENING (BOTH SIDES)

POWER ENTRY(BOTH SIDES)

CONTROL ENTRY(BOTH SIDES)

COMPRESSOR ACCESS

42" SERVICE CLEARANCE FRONT

DRAIN CONNECTION

AIR FILTER ACCESS

(BOTH SIDES)

(BOTH SIDES)

26" SERVICE CLEARANCELEFT SIDE

SIGHT GLASS/FILTER DRIER ACCESS(RIGHT SIDE)

24"

26" SERVICE CLEARANCELEFT SIDE

REAR RETURN

18" SERVICE CLEARANCEREAR

26" SERVICE CLEARANCERIGHT SIDE

3 through 15-ton SCWH/SIWH/SRCH/SIRH with top-mounted fan configuration

LATCH

HEATER ACCESS

THIS PANEL GOES TO TOP ON HORIZONTAL AIR DISCHARGE CONFIGURATION

PROVIDED DISASSEMBLED(FOR FIELD-INSTALLED REAR RETURN)

3 through 7.5-ton SCRH/SIRH/SCWH/SIWH

Service Access

8 PKG-SVX14A-EN


Service Access

10, 12, & 15-ton SCWH/SIWH/SRCH/

SIRH with side-mounted fan configura-

tion, field converted

10 through 15-ton SCRH/SIRH/SCWH/SIWH

PKG-SVX14A-EN 9


Table I-PC-1. Isolator load points, units with a vertical discharge configuration, lbs.

model L1 L2 L3 L4 L1 L2 L3 L4

SCRB/SIRB SCWB/SIWB

3-ton 99 105 120 127 105 133 118 1245-ton 115 122 157 166 129 165 166 1657.5-ton 154 203 227 221 177 234 230 23110-ton 208 266 273 253 263 334 293 30015-ton 243 332 359 356 315 388 382 375

Table I-PC-2. Isolator load points, units with a horizontal discharge configuration, lbs.

model L1 L2 L3 L4 L1 L2 L3 L4

SCRB/SIRB SCWB/SIWB

7.5-ton 250 108 313 135 285 126 319 14010-ton 318 150 363 169 383 211 383 21115-ton 404 166 510 210 514 215 514 215

Table I-PC-3. Isolator load points & types, units with a horizontal discharge, inverted “L”

configuration, lbs.

air-cooled models water-cooled models

L1 L2 L3 L4 L1 L2 L3 L4

10-ton unit 318 150 363 169 383 211 383 211spring red yellow red yellow red yellow red yellowrubber-in-shear green red green red green red green red

15-ton unit 404 166 510 210 514 215 514 215spring purple yellow purple yellow purple yellow purple yellow

rubber-in-shear gray red gray red gray red gray red

Note: Units ship with two different color isolators and should be placed as depicted in this chart to properly support theunit weight. See Figures I-PC-1 & I-PC-2 for correct isolator positions by unit size.

3, 5, & 7.5-ton units

bottom view of unit

1 7/8

1 7/8

7/8” dia. hole under all 4 corners

Figure I-PC-1. Isolator mounting hole locations on 3, 5, &

7.5-ton units

10 & 15-ton units

bottom view of unit

1 3/8

3 3/4

9/16” dia. hole under all 4 corners

Figure I-PC-2. Isolator mounting hole locations on 10 & 15-

ton units

L1 L3

L2 L4

L1 L3

L2 L4

Isolator Placement

Note: Isolators are field-provided.

10 PKG-SVX14A-EN

Proper Lifting Procedure

Follow these instructions and referenceFigure I-PC-3.1. Slide a fork lift into the opening

provided on the unit base. Move thefork lift carefully.

2. Using slings, attach through the circularholes provided on the unit base. Protectthe unit from damage by riggingequipment.

WARNINGImproper Unit Lift!Test lift unit approximately 24 incheshigh to verify the proper center-of-gravity lift point. To avoid dropping theunit, reposition the lifting point if theunit is not level. Failure to properly liftthe unit could result in death, seriousinjury, or possible equipment/property-only damage.


Figure I-PC-3. Proper unit lifting procedure

PKG-SVX14A-EN 11

dimensions &weightsInstallation

3 & 5-tons

SCWH/SIWH/SCRH/SIRH

SCRH/SIRH

SCWH/SIWH

vertical dischargehorizontal discharge

(field converted)

SCWH/SIWH/SCRH/SIRH dimensions & weight, in-lbs.

unit shipping operatingsize A B C D E F G J K L M N O P Q R S weight weight

3 31.89 64.17 22.24 5.65 11.93 14.31 10.63 18.00 7.80 7.80 15.60 15.63 20.20 6.28 4.33 8.58 4.37 494 459

5 36.41 75.98 24.01 7.73 13.03 15.65 11.61 20.31 12.32 8.66 20.98 18.58 24.20 7.10 5.43 6.38 7.12 592 555

12 PKG-SVX14A-EN

dimensions &weights

7.5-tons

SCWH/SIWH/SCRH/SIRH

Installation

SCWH/SIWH

vertical discharge horizontal discharge(field converted)

SCWH/SIWH/SCRH/SIRH weight, lbs.

unit shipping operatingsize weight weight

7.5 702 657

SCRH/SIRH

PKG-SVX14A-EN 13


10, 12, & 15-tons with top-mounted fan configuration

SCWH/SIWH/SCRH/SIRH

horizontal discharge(field converted)vertical discharge

SCRH/SIRHSCWH/SIWH

SCWH/SIWH/SCRH/SIRH dimensions & weight, in-lbs.

unit shipping operatingtons A B C D E F G J K M N weight weight

10 66.75 88.78 7.04 18.07 57.28 19.01 25.0 5.23 7.48 5/8 8.30 984 917

12 65.75 92.71 7.04 18.07 61.22 22.95 29.01 5.23 7.48 5/8 12.24 977 907

15 80.31 92.71 19.83 19.83 61.22 22.95 29.01 4.76 5.12 3/4 12.24 1098 1021

14 PKG-SVX14A-EN

10, 12, & 15-tons with side-mounted fan configuration, field converted

SCWH/SIWH/SCRH/SIRH

SCWH/SIWH/SCRH/SIRH Dimensions, in.

unittons A C D E F G

10 65.75 7.04 18.07 57.28 66.93 25.79

12 65.75 7.04 18.07 61.22 66.93 29.73

15 80.31 19.83 19.83 61.22 81.49 29.73

Notes:1. Base rail must be attached to the floor before converting

unit to side-mounted fan configuration.2. Coil or electric heater cannot be assembed inside the

cabinet with the side-mounted fan configuration.


PKG-SVX14A-EN 15


Plenum

Plenum dimensions & weight, in-lbs.

unit size A B weight

3-ton 31.89 22.24 44

5-ton 36.41 24.01 54

7.5-ton 40.94 28.74 73

10 & 12-ton 65.75 29.52 120

15-ton 80.31 29.52 146

A

B

C

D

E

FG

0.39

0.28

1.38

1.38

5.91 1.573.15

0.39

0.59

0.59

2.18

2.18

8.39

1.03 1.03

1.08

0.750.75

5.9

1.0 NPT

Hot water coil

3 & 5-ton units

SCWH/SCRH/SCRH/SIRH Hot water coil dimensions & weights, 3 & 5-ton units, in-lbs.

size A B C D E F G weight

3-ton 26.46 18.98 25.67 5.79 5.79 10.00 12.76 13

5-ton 30.98 23.50 30.20 7.040 7.040 12.50 15.26 18

16 PKG-SVX14A-EN


A

B

D

C0.43

0.28

0.39 0.391.03

1.03

1.08

1.573.19

0.750.755.90

1.00 NPT

1.38

1.38

17.5

0

20.2

61.

38

8.27

2.180.59

9.54

9.54

15.8

92.

18

9.07

7.480.

59

BLOCKOFF (SHIPS DISASSEMBLED)

Hot water coil

10 thru 15-ton units

35.51

28.035.910.43

1.57

3.15

34.72 0.39

0.750.75

0.39

5.9

1.0 NPT

0.75

17.0

0

0.75 2.

222.

2216

.25

20.7

0.39

1.87

8.48

8.48

14.6

41.

551.

55

3.03

0.391.

87

1.03

1.08

1.03

0.28

Hot water coil

7.5-ton units

SCWH/SCRH/SCRH/SIRH Hot water coil dimensions & weights, in-lbs.

size A B C D weight

7.5-ton - - - - 24

10-ton 58.72 50.98 6.95 59.51 49

12-ton 58.72 50.98 6.95 59.51 49

15-ton 73.29 63.98 8.52 74.07 55

PKG-SVX14A-EN 17

mechanicalrequirements

Duct Connections

Install all air ducts according to theNational Fire Protection Associationstandards for the “Installation of AirConditioning and Ventilation Systemsother than Residence Type (NFPA 90A)and Residence Type Warm Air Heatingand Air Conditioning Systems (NFPA90B).

Make duct connections to the unit with aflexible material such as heavy canvas. Ifa fire hazard exists, Trane recommendsusing Flexweave 1000, type FW30 orequivalent canvas. Use three inches forthe return duct and three inches for thedischarge duct. Keep the material looseto absorb fan vibration.

Run the ductwork straight from theopening for a minimum of three fandiameters. Do not make abrupt turns ortransitions near the unit due to increasednoise and excessive static losses. Useelbows with splitters or turning vanes tominimize static losses.

Poorly constructed turning vanes maycause airflow generated noise. Checktotal external static pressures against fancharacteristics to be sure the requiredairflow is available throughout theductwork.

WARNINGHazardous Voltage!Disconnect all electric power,including remote disconnects beforeservicing. Follow proper lockout/tagout procedures to ensure powercannot be inadvertently energized.Failure to disconnect power beforeservicing could result in death orserious injury.

Water Piping

Condenser Connections

Note: To prevent water damage, installpiping drain and vent plugs.

Condenser water piping knockouts are inthe lower left end panel. If necessary,remove insulation to gain access. All fieldinstalled piping must conform toapplicable local, state, and federal codes.To complete condenser waterconnections follow the procedure below.1. Remove back panel to access the

water connection fittings.2. Attach the water supply line to the inlet

connection, and the return line to theoutlet connection. The water connectionfittings are copper, so exercise extremecare when connecting steel piping tocopper fittings.

3. Ensure that water piping is aligned tothe unit connection fittings. Failure toalign piping could cause strippedthreads, leakage, and possible unitfailure.

4. Connection to the unit water pipingrequires a backing wrench to preventdistortion of connecting tubing. Applybacking wrench to water connectionpoints on unit.

Condensate Drain ConnectionsInstall a water regulating valve in thewater supply line to maintainheadpressure when operating with city waterof varying temperature.

These units require a minimum waterpressure of 15 psig and will operate at amaximum of 400 psig.

Provide safeguards against cold weather

Installation

drain line freeze.

Cooling Tower PipingCooling tower control affects the unitcycle rates. Condenser watertemperature swings from 10-15°F maycause excessive compressor, watervalve, and unit cycling. Be sure to set thetower controls to minimize compressor/unit cycling.

The cooling tower system requires aseparate drain in the water supply line forservice and repair.

Water Temperature RequirementsInstall a water regulating valve in thewater supply line to maintain headpressure when operating with water ofvarying temperature. The valvemodulates condenser water flow tocontrol condensing pressure. The valveopens or closes in response tocompressor discharge pressure assensed by its capillary line connection iinthe liquid line shrader valve. When thevalve is properly installed, water flowautomatically decreases as dischargepressure falls and increases as dischargepressure rises. Field installation of thewater regulating valve assemblyrequires one valve for each refrigerationcircuit.

18 PKG-SVX14A-EN

mechanicalrequirementsInstallation

Refrigerant Piping (Air-CooledUnits Only)

Reference industry recommendationsfor air-cooled unit refrigerant piping. Ifsuspending piping from the building, useisolation hangers to prevent vibrationtransmission.

Air-cooled units ship with a holdingcharge of nitrogen. Before installing unitpiping, momentarily depress either thesuction or discharge line access valve toverify that the holding charge has notbeen lost. If nitrogen does not escapewhen depressing the access valve, leak-test the entire refrigerant system todetermine the source of loss.

The charge is contained by a continuousloop of both hot gas and liquid lines. Youmust cut the loop for connection todischarge and liquid lines. See Figure I-MR-1.

Brazing ProceduresProper brazing techniques are essentialwhen installing refrigerant piping. Keepthe following factors in mind whenmaking sweat connections.1. When heating copper in the presence

of air, copper oxide forms. To preventcopper oxide from forming inside thetubing during brazing, sweep an inertgas, such as dry nitrogen, through thetubing. Nitrogen displaces air in thetubing and prevents oxidation ofinterior surfaces. A nitrogen flow of oneto three cubic feet per minute issufficient to displace the air. Use apressure regulating valve or flow meterto control the flow.

2. Ensure tubing surfaces that requirebrazing are clean and the ends of thetubes are carefully reamed to removeany burrs.

3. Make sure the inner and outer tubes ofthe joint are symmetrical and have aclose clearance, providing an easy slipfit. If the joint is too loose, the tensilestrength of the connection will besignificantly reduced. Make the overlapdistance equal to the inner tubediameter.

4. Wrap the body of each refrigerant linecomponent with a wet cloth to keep itcool during brazing. Excessive heat candamage the components.

5. If using flux, apply it sparingly to thejoint. Excess flux will contaminate therefrigerant system.

6. Apply heat evenly over the length andcircumference of the joint, making surethe entire joint becomes hot enough tomelt the brazing material.

7. Begin brazing when the joint is hotenough to melt the brazing rod. The hotcopper tubing, not the flame, shouldmelt the rod.

8. Continue to apply heat around the jointcircumference until the brazing materialis drawn into the joint by capillaryaction, making a mechanically soundand gas-tight connection.

9. Visually inspect the connection afterbrazing to locate any pin holes orcrevices in the joint. Use a mirror toinspect connections that are difficult tosee.

Figure I-MR-1. Air-cooled unit refrigerant piping

PKG-SVX14A-EN 19

electricalrequirementsInstallation

Electrical Requirements

Follow these guidelines, referring to unitwiring diagrams and supply powerdimensional information to ensurecorrect electrical requirements at theinstallation site. Reference supply powerwiring locations on unit submittals orinthe “Dimensions and Weights” section.Specific unit wiring diagrams areprovided on each unit. Use thesediagrams for connections or troubleanalysis.

Unit Wiring DiagramsSpecific unit wiring diagrams areprovided on the inside of the controlpanel door. Use these diagrams forconnections or trouble analysis.

Supply Power WiringIt is the installer’s responsibility to providepower supply wiring to the unit terminalblock or the non-fused disconnect switchoption. Wiring should conform to NEC andall applicable code requirements.1. Verify the power supply available is

compatible with the unit nameplateratings. The supply power must bewithin 10%of the rated voltage listed onthe unit nameplate.

2. Reference the electrical data in Table I-ER-1. Protect the electrical service fromover current and short circuitconditions in accordance with NECrequirements. Size protection devicesaccording to the electrical data on theunit nameplate.

3. If using a field-supplied disconnect,install it at or near the unit inaccordance with NEC. Do not mount afield-supplied disconnect on the unit.Reference the electrical serviceentrance location on unit submittals.

4. Complete the unit power wiringconnections onto either the mainterminal block or the field-provided non-fushed disconnect switch.

5. Provide proper unit grounding inaccordance with local and nationalcodes.

Electrical Data Calculations

RLA = rated load ampsCompressor LRA = locked rotor ampsFan motor LRA = locked rotor amps,N.E.C. Table 430 - 151FLA = Full load amps, N.E.C.

Table 430 - 150

Voltage utilization range is ±10%

Minimum circuit ampacity (MCA) = 1.25 x largest motor amps (FLA orRLA) + the sum of the remaining motoramps.

Maximum fuse size (MFS) and maximumcircuit breaker size (MCB) = 2.25 x largestmotor amps (FLA or RLA) + the sum ofthe remaining motor amps.

Note: If the rating value determined doesnot equal a standard current rating ofover current protective device, use thenext lower standard rating for themarked maximum rating.

Voltage RangeVoltages must be within +- 10% thenameplate voltage. Ensure the unitvoltage is balanced by measuring at thecompressor terminals. Voltage imbalanceon three phase systems can cause motoroverheating and premature failure.Maximum allowable imbalance is 2.0%.

Voltage ImbalanceRead the voltage at the compressorterminals to determine if it is balanced.Voltage imbalance on three phasesystems can cause motor overheatingand premature failure. The maximumallowable imbalance is 2.0%. Voltageimbalance is defined as 100 times thesum of the deviation of the three voltagesfrom the average (without regard to sign)divided by the average voltage. Forexample, if the three measured voltagesare 221, 230, and 227, the averagevoltage would be:

(221 + 230 + 227) = 226 volts 3

The percentage of voltage imbalance isthen:

100 * (226-221) = 2.2%226

In this example, 2.2% imbalance is notacceptable. Whenever a voltageimbalance of more than 2.0% exists,check the voltage at the unit disconnectswitch. If the imbalance at the unitdisconnect switch does not exceed 2.0%,faulty unit wiring is causing theimbalance. Conduct a thoroughinspection of the unit electrical wiringconnections to locate the fault, and makeany repairs necessary.

WARNINGLive Electrical Components!During installation, testing, servicing,and troubleshooting this equipment, itmay be necessary to work with liveelectrical components. Have aqualified licensed electrician or otherindividual who is properly trained inhandling live electrical componentsperform these tasks. Failure to followall electrical safety precautions whenexposed to live electrical componentscould result in death or serious injury.



20 PKG-SVX14A-EN

electricalrequirementsInstallation

RLA LRA qty. hp FLA qty. hp FLA qty

SC*H0303.... 208-230V/60Hz/3Ph 12.9 77.0 0.5 2.21 1 18.3 30 3.15 19.3 30SC*H0304.... 460V/60Hz/3Ph 5.7 35.0 1.00 8.1 15 1.42 8.5 15SC*H0305.... 575V/60Hz/3Ph 4.8 31.0 0.80 6.8 15 1.14 7.1 15

SC*H0503.... 208-230V/60Hz/3Ph 22.9 155.0 5.00 33.6 50 5.81 34.4 50SC*H0504.... 460V/60Hz/3Ph 10.7 75.0 2.50 15.9 25 2.63 16.0 25SC*H0505.... 575V/60Hz/3Ph 8.5 54.0 1.50 12.1 20 2.10 12.7 20





12 2

tons MFS / MCBmodel voltage compressor evap. fan motor min. circuit ampacity

10 2 2 1

2 1

evaporator standard motor evaporator oversized motorevap. fan motor MFS /

MCBmin. circuit ampacity

5 1

2 1

5 1

3 1 1 1

5 1 1 1

7.5 1 2 1

3 1 5 1

15 2 3 1

Table I-ER-1. Model SCWH/SIWH/SCRH/SIRH electrical data



Notes:1. Voltage range:Nominal voltage 208 - 230V - acceptable range: 187 - 253VNominal voltage 460V - acceptable range: 414 - 506VNominal voltage 575V - acceptable range: 518 - 633V2. Ampacity is calculated per UL formula, ampacity = (1.25 x compressor RLA + sum of the second compressor RLA (if

used) + evaporator motor FLA3. Maximum fuse size is calculated per UL formula, MFS = (2.25 x compressor RLA) + sum of second compressor RLA (if

used) + evaporator motor FLA

PKG-SVX14A-EN 21

Installation Checklist

Reference the checklist below to verify allsteps required to successfully install adeluxe self-contained unit are complete.This checklist is intended to acquaint theinstalling personnel with what is requiredin the installation process. It does notreplace the detailed instructions detailedin the applicable sections of this manual.

WARNING

Hazardous voltage!Before servicing unit disconnect allelectrical power including remotedisconnects. Follow proper lockout/tagout procedures to ensure powercannot be inadvertently energized.Failure to disconnect power beforeservicing can cause death or seriousinjury.

General Unit Requirements)Install and secure the ductwork to the

unit.)Check unit for shipping damage and

material shortage. Refer to theReceiving Checklist.

Electrical Requirements)Verify that the electrical power supply

characteristics comply with the unitnameplate specifications.

)Inspect all control components; tightenany loose connections.

)Connect properly sized and protectedpower supply wiring to a field supplied/installed disconnect and unit powerterminal block, or to the optional unitmounted disconnect switch.

)Properly ground the unit.

Field Installed Control Wiring (Optional))Complete the field wiring connections.

Note: All field installed wiring mustcomply with NEC and applicable localcodes.

Fan Discharge Conversion

Complete the steps below to convert thefan discharge from vertical to horizontal.

1. Remove all mid and top fan sectionpanels.

2. Loosen the brackets inside the unit thatclamp the mid and fan sectionstogether.

3. Remove the control box cover anddisconnect the motor power wires.Feed wires up through the unit andsecure out of the way until rotation iscomplete.

4. Rotate the fan section to desiredposition.

5. Re-route the motor power wires backto the control box. Ensure all wiring isfree and not routed over any sharpedges.

6. Reconnect the motor power wires perthe unit wiring diagram.

7. Bolt and/or clamp all brackets back intoplace.

8. Replace control box cover and allexterior panels.

9. Verify the fan rotation and motor ampdraw.

Plenum Installation

1. Uncrate the plenum and accessorybag.

2. Rotate the evaporator blower to thevertical discharge configuration.

3. Apply the soft gasket provided aroundthe aluminum frame on top of the unitas shown in Figure I-IP-1.

4. Using a screwdriver, tighten the self-drilling screws as shown in Figure I-IP-1. Be sure to tighten all screws on therear, right, and left sides through thepilot holes on the plenum panels.

5. When installation is complete, adjustthe motor pulley and the dischargegrille for proper airflow.

installationprocedureInstallation

Figure I-IP-1. Plenum installation

22 PKG-SVX14A-EN

pre-startuprequirementsInstallation

Pre-Startup Checklist

Complete this checklist after installing theunit to verify all recommendedinstallation procedures are completebefore unit startup. This does not replacethe detailed instructions in theappropriate sections of this manual.Always read the entire section carefullyto become familiar with the procedures.

WARNING

Hazardous Voltage!Disconnect all electrical power,including remote disconnects beforeservicing. Follow proper lockout/tagoutprocedures to ensure power cannot beinadvertently energized. Failure todisconnect power before servicingcould result in death or serious injury.

Receiving*Inspect unit and components for

shipping damage. File damage claimsimmediately with the delivering carrier.

*Check nameplate unit data so that itmatches the sales order requirements.

*Check unit for missing material. Lookfor ship-with accessories that arepackaged separately and placed insidethe access panel, fan section, orcompressor section. See the“Receiving and Handling” section.

Unit Location*Ensure the unit location is adequate for

unit dimensions, ductwork, piping, andelectrical connections.

*Ensure access and maintenanceclearances around the unit areadequate. See the “Service Access”section.

Unit Mounting*Remove shipping brackets on the

compressor assembly and supply fan.

Component Overview*Verify the fan and motor sheaves are

aligned.*Check the belt tension for proper

adjustment.*Ensure the fan rotates freely.*Tighten locking screws, bearing set

screws and sheaves.*Ensure bearing locking collars do not

wobble when rotated.*Ensure all air filters are properly

installed with consideration of size andair flow.

*Manually rotate the evaporator fan toensure free movement. Verify that all ofthe fan mounting hardware is tight.

Ductwork*Verify that all ductwork conforms to

NFPA 90A or 90B and all applicablelocal codes.

PKG-SVX14A-EN 23

Unit Startup Procedures

1. Check all electrical connections fortightness.

2. Be sure all unit accessories areproperly set and installed.

3. Model SCWH/SIWH: Verify condenserwater piping is properly connected,supply, and return.

4. Model SCRH/SIRH: Verify refrigerantpiping is properly connected, hot gas,and liquid.

5. Inspect all ductwork and ductconnections.

6. Check for proper belt tension.7. Check fan drive sheaves, pulleys, and

bearings.

Unit Startup Checklist1. Turn the thermostat to the OFF

position.2. Engage power supply by closing

power disconnect.3. Switch thermostat to fan position and

adjust temperature setting below roomtemperature. Evaporator fan shouldstart.

startupInstallation

4. Check evaporator section for properoperation.

5. Switch thermostat to cool position andadjust temperature setting to belowroom temperature. The evaporator fanand compressor(s) should start.

Note: These units are equipped with highefficiency scroll compressors. Check forproper scroll rotation prior to operatingunit.

6. Check the evaporator fan for properrotation. If fan rotation is incorrect,switch thermostat to Off position anddisconnect power. Reverse two phaseleads at disconnect and return back toStep 1 of startup.

7. Allow unit to run until all systemtemperatures and pressures stabilize.

8. Check systems for proper operationand performance. Observe unit inoperation and check for unusual noise,vibration, belt, and fan clearances.

24 PKG-SVX14A-EN

Operationsequence ofoperation

Sequence of Operation

The thermostat controls the unitoperation. It has both manual andautomatic switches so the thermostatmaintains desired comfort levels.

The fan switch allows manual selection ofthe fan speed using the On or Autosetting. With the switch set in the Onposition, the evaporator fan runscontinously, independent from thethermostat temperature setting. TheAuto position cycles the evaporator fanon and off with the demand for heating orcooling.

The system switch may have two ormore positions. For example, using acooling only thermostat, the systemswitch can be set in the Off or the Coolposition. The Off position disconnectspower from the thermostat contacts thatcontrol the condensingunit. This prevents

the condensing unit from running,regardless of the thermostat tempera-ture setting. The evaporator fan maycirculate air if the fan switch is in the Onposition. With the switch in the Coolposition, the condensing unit and evapo-rator will operate on a signal from thethermostat calling for cooling.

With the fan switch set to Auto and thesystem switch set to Cool, the followingsequence takes place. On a rise in roomtemperature,t he thermostat contactsclose to provide power to the evaporatorfan contactor,t he condensing unit fancontactor,a nd the condensingunitcompressor contactors. As the roomtemperature reaches setpoing, thethermostat contacts open to de-energizeall contactors,a nd the system cycles off.This system will remain off until additionalcooling is required and the cycle repeats.

PKG-SVX14A-EN 25

Maintenancegeneralinformation

Table M-GI-1. Midrange maintenance general data

SCWH030 SCWH050 SCWH075 SCWH100 SCWH120 SCWH150dimensions, in-lbs.height 66.93 78.74 78.94 91.54 95.47 95.47length 31.89 36.41 40.94 65.75 65.75 80.31depth 22.24 24.01 28.74 29.52 29.52 29.52weight (shipping / net) 494 / 459 592 / 555 702 / 657 1094 / 1027 1133 / 1063 1249 / 1172cooling performancenet cooling capacity, btu/h 36000 65290 87570 116986 138204 167303EER 12.13 12.28 11.6 11.5 11.1 11.3nominal air flow, cfm 1200 2000 3000 4000 4800 6000system power, kW 3.0 5.3 7.6 10.2 12.5 14.8Copeland scroll compressorquantity 1 1 1 2 2 2model ZP32 ZP57 ZP83 ZP57 ZP67 ZP83indoor coil, 3/8" tube sizeface area, sq. ft. 3.19 4.98 7.13 12.12 12.12 14.56rows / fpf 4 / 144 4 / 144 3 / 168 2 / 168 2 / 168 3 / 168water condenser, tube & tubewater connection, in. 3/4 NPT 3/4 NPT 3/4 NPT 1 1/4 NPT 1 1/4 NPT 1 1/4 NPTindoor fan, belt-drivenquantity 1 1 2 2 2 2diameter x width 9 x 9 10 x 10 9 x 9 12 x 12 12 x 12 12 x 12motor 1 / 0.5 1 / 1.0 1 / 2.0 1 / 2.0 1 / 3.0 1 / 3.0motor frame size 56 56 56 56 56 56air filter, 1" throwaway

size / (quantity), in. 14 x 25 (1) 14 x 20 (1) + 20 x 20 (1) 18 x 24 (2) 18 x 24 (3) +

24 x 24 (1)refrigerant, R-410A, TXV control refrigerant charge (Ckt 1 / 2), lbs. 3.8 5.4 7.8 5.1 / 5.2 6.5/6.3 7.2/7.2hot water coil, 2-row, 108 fpf, 1/2" tubesface area, sq. ft. 1.42 2.08 3.27 6.2 6.2 7.78

Notes:1. Net cooling capacity is rated at 95°F ambient, 80°F entering dry bulb and 67°F entering wet bulb @ SCFM air condition.2. EER is rated at ARI condition.

12 x 24 (1) + 24 x 24 (2)

26 PKG-SVX14A-EN

Maintenancemaintenanceprocedures

Maintenance Procedures

This section describes specificmaintenance procedures that must bepreformed as a part of the normalmaintenance program. Alwaysdisconnect electrical power to the unitbefore performing these procedures andheed all warnings and cautions.

WARNINGLive Electrical Components!During installation, testing, servicing,and troubleshooting this equipment, itmay be necessary to work with liveelectrical components. Have aqualified licensed electrician or otherindividual who is properly trained inhandling live electrical componentsperform these tasks. Failure to followall electrical components could resultin death or serious injury.

WARNING

Hazardous Voltage!Disconnect all electrical power includingremote disconnects before servicingunit. Follow proper lockout/tagoutprocedures to ensure power cannot beinadvertently energized. Failure todisconnect power before servicing canresult in death or serious injury.

Periodic Maintenance Checklist+ Inspect coil surface for cleanliness.

Clean as required, referring to the “CoilCleaning” section.

Annual Maintenance Checklist+ Perform all monthly maintenance

inspections.+ Perform seasonal startup checks.+ Leak test refrigerant circuits. Inspect

contacts of fan motor contactors andrelays. Replace all worn contacts.

+ Clean and repaint any corrodedsurface.

Note: the following coil cleaning proce-dures apply only to the outdoor condens-ers. Do not use these procedures for thereheat or evaporator coils.

Cleaning the Condenser CoilsClean the coil at least once each year ormore frequently if located in a dirtyenvironment, to help maintain proper unitoperating efficiency. High dischargepressures are a good indication that thecoil needs cleaning. Follow the detergentmanufacturer instructions as closely aspossible to avoid potential coil damage.

WARNING

Hazardous Chemicals!Coil cleaning agents can be either acidicor highly alkaline.Handle chemicalcarefully. Proper handling shouldinclude goggles or face shield, chemicalresistant gloves, boots, apron, orprotective suit as required. For personalsafety, refer to the cleaning agentmanufacturer’s materials safety datasheet and follow all recommended safehandling practices. Failure to follow allsafety instructions could result in deathor serious injury.

To clean the refrigerant coil, use a softbrush and sprayer, such as a gardenpump up or high pressure type . Inaddition, use a quality detergent; like“SPREX AC’, “ OAKITE 161” or “OAKITE166” and “COILOX.”

Note: If detergent is strongly alkaline (i.e.has a pH value greater that 8.5 ) aftermixing, you must add an aluminumcorrosion inhibitor.

Coil Cleaning Procedure1. Disconnect power to the unit.2. Remove panels from the unit to gain

access to the coil.3. Use a soft brush to remove loose dirt

and debris form both sides of the coil.4. Straighten coil fins with fin comb as

required.5. Mix the detergent with water

according to the manufacturersinstructions.

Observe all recommendations of thecleanser manufacturer. The coil cleansermanufacturer’s recommendations,warnings and cautions will at all timestake precedence to these instructions.1. Place solution in the sprayer. Be sure to

follow these guidelines if using a high-pressure sprayer:

a) Keep minimum nozzle spray angle 15°.b) Spray solution at a 90° angle to the coil

face.c) Keep sprayer nozzle at least six inches

from the coil.d) Sprayer pressure must not exceed

600 psi.2. Spray leaving air side of the coil first

then spray the entering air side of thecoil. Allow the detergent and watersolution to stand on the coil for fiveminutes.

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

4. Inspect the coil. If it still appears dirty,repeat the cleaning procedure.

5. Reinstall all unit components andpanels, and restore electrical powerand gas supply to the unit.

CAUTION

Freezing Temperatures!Do not allow liquid refrigerant to comeinto contact with the skin. If it does,treat the injury similar to frostbite.Slowly warm the ffected area withlukewarm water and seek immediatemedical attention. Direct contact withliquid refrigerant may cause minor ormoderate injury.

PKG-SVX14A-EN 27

• To assist in reducing power generationemissions, always attempt to improveequipment performance with improvedmaintenance and operations that willhelp conserve energy resources.

WARNINGConfined Space Hazards!Do not work in confined spaces wheresufficient quantities of refrigerant orother hazardous, toxic, or flammablegas may be leaking. Refrigerant orother gases could displace availableoxygen to breathe, causing possibleasphyxiation or other serious healthrisks. Some gases may be flammableand or explosive. Evacuate the areaimmediately and contact the properrescue or response authority. Failureto take appropriate precautions or toreact properly to a potential hazardcould result in death or serious injury.

WARNINGHazard of Explosion!Use only dry nitrogen with a pressureregulator to pressurize the unit. Do notuse acetylene, oxygen, compressedair, or mixtures containing them.Do not use mixtures of a hydrogencontaining refrigerant and air aboveatmospheric pressure for pressuretesting as they may becomeflammable and could result in anexplosion. Refrigerant, when used asa trace gas should only be mixed withdry nitrogen for pressurizing units.Failure to follow theserecommendations could result indeath, serious injury, equipment, orproperty-only damage.

WARNINGLeak Testing!Do not exceed 200 psig when leaktesting system. Failure to follow theseinstructions could result in anexplosion causing death or seriousinjury.

Refrigerant System

Special Note on Refrigerant EmissionsFollow the Trane recommendedprocedures on operation, maintenance,and service to ensure refrigerantconservation and emission reduction.Also, pay specific attention to thefollowing:• Whenever removing refrigerant from

equipment, recover for reuse, recycle,reprocess (reclaim), or properly destroyit.

• Always determine possible refrigerantrecycling or reclaiming requirementsbefore beginning recovery. Questionsabout recovered refrigerants andacceptable refrigerant qualitystandards are addressed in ARIStandard 700.

• Use approved containment vessels andsafety standards. Comply with allapplicable transportation standardswhen shipping refrigerant containers.

• To minimize emissions while recoveringrefrigerant, use recycling equipment.Always attempt to use methods thatpull the lowest possible system vacuumwhile recovering and condensingrefrigerant into containment.

• When leak checking with tracerefrigerant and nitrogen, use HCFC22(R22) rather than CFC12 (R12) or anyother fully halogenated refrigerants. Beaware of any new leak test methodsthat eliminate refrigerant as a trace gas.

• When cleaning system components orparts, do not use CFC11 (R11) orCFC113 (R113). Refrigeration systemclean up methods using filters anddryers are recommended. Do not usesolvents that have ozone depletionfactors. Properly dispose of usedmaterials.

• Take extra care to properly maintain allservice equipment directly supportingrefrigerant service work such asgauges, hoses, vacuum pumps, andrecycling equipment.

• Stay aware of unit enhancements,conversion refrigerants, compatibleparts, and manufacturer’srecommendations that reducerefrigerant emissions and increaseequipment operating efficiencies.Follow specific manufacturer’sguidelines for conversion of existingsystems.

In the event of required system repair,leak test the liquid line, evaporator coil,and suction line at pressures dictated bylocal codes, and using the followingguidelines.1. Charge enough refrigerant and dry

nitrogen into the system to raise thepressure to 100 psig.

2. Use a halogen leak detector, halidetorch, or soap bubbles to check forleaks. Check interconnecting pipingjoints, the evaporator coil connections,and all accessory connections.

3. If a leak is detected, release the testpressure, break the connections andreassemble it as a new joint, usingproper brazing techniques.

4. If no leak is detected, use nitrogen toincrease the test pressure to 150 psigand repeat the leak test. Also, use soapbubbles to check for leaks whennitrogen is added.

5. Retest the system to make sure newconnections are solid.

6. If a leak is suspected after the systemhas been fully charged with refrigerant,use a halogen leak detector, halidetorch, or soap bubbles to check forleaks.

Refrigerant EvacuationFor field evacuation, use a rotary stylevacuum pump capable of pulling avacuum of 100 microns or less.

When connecting the vacuum pump to arefrigeration system, it is important tomanifold the pump to both the high andlow side of the system. Follow the pumpmanufacturer’s directions.

WARNINGUse of Pressure Regulator –Valves – Gauges!Always use pressure regulators,valves, and gauges to control drumand line pressures when pressuretesting equipment. Failure to followthese instructions could result in anexplosion causing death, seriousinjury, or equipment damage.


28 PKG-SVX14A-EN

control disarming rearming

high pressure control (air-cooled & 12-ton water cooled) 624±17.5 psig 464±29 psig

high pressure control (water-cooled except 12-ton) 450±10 psig 348±14.5 psig low pressure contol 51±7 psig 94±7 psig

130±5C 90±5 3 / 204-230 & 575135±5C 92 5 / 208-230130±5C 92 5 / 57590±5C 57 7.5 - 10 / 208-230120±5C 69 7.5 - 10 / 57590±5C 57 12 - 15 / 208-230105±5C 61 12 - 15 / 575

motor windings thermostat, standard motor only

unit (ton / voltage)


water-cooled air-cooledhigh pressure 280 to 430 psig 320 to 570 psiglow pressuresuperheatsubcooling

100 to 160 psig4 to 9°C

5 to 10°C

Table M-MP-2. Controls adjustment

Table M-MP-1. Normal operation condition

CAUTIONMotor Winding Damage!Do not use a megohm meter or applygreater than 50 VDC to a compressormotor winding while it is under adeep vacuum. Voltage sparkover maycause damage to the motor windings.

WARNING

Hazardous Pressures!If a heat source is required to raisethe tank pressure during removal ofrefrigerant from cylinders, use onlywarm water or heat blankets to raisethe tank temperature. Do not exceeda temperature of 150°F. Do not, underany circumstances, apply direct flameto any portion of the cylinder. Failureto follow these safety precautionscould result in a violent explosion,which could result in death or seriousinjury.

Charging the Refrigerant SystemTo completely charge the system, chargegaseous refrigerant into the suction lineshrader valve with the unit running.However, make sure that somerefrigerant is present in each circuitbefore starting the compressors.

CAUTIONCompressor Damage!Do not allow liquid refrigerant to enterthe suction line. Excessive liquidaccumulation in the liquid lines mayresult in compressor damage.

CAUTIONCompressor Damage!Never manually or automaticallypump down below 7 psig. This willcause the compressor to operate in avacuum and result in compresordamage.

PKG-SVX14A-EN 29

Periodic Checklists

Monthly ChecklistThe following checklist provides therecommended maintenance schedule tokeep the unit running efficiently.

WARNING

Hazardous Voltage!Disconnect all electrical power includingremote disconnects before servicingunit. Follow proper lockout/tagoutprocedures to ensure power cannot beinadvertently energized. Failure todisconnect power before servicing canresult in death or serious injury.

1. Inspect unit air filters. Clean or replaceif airflow is blocked or if filters are dirty.

2. Inspect coils for icing. Icing on the coilsmay indicate low airflow supply,restricted airflow from dirty fins.

3. Check the fan belt condition andtension. Adjust tension if belt is floppy orsqueals continually.

4. Check and record operating pressures.

Semi-Annual Maintenance1. Verify the fan motor is properly aligned

and bolted tight to the motor frame.2. Lubricate fan bearings.3. With power disconnected, manually

rotate the fan wheel to check forobstructions in the housing or

interference with fan blades. Removeobstructions and debris. Center the fanwheel if necessary.

4. Check the fan assembly sheavealignment. Tighten set screws to theirproper torques.

Note: Perform this procedure monthly ifthe unit is in a coastal or corrosiveenvironment.

Annual MaintenanceCheck and tighten all set screws, bolts,locking collars and sheaves.1. Inspect, clean, and tighten all electrical

connections.2. Visually inspect the entire unit casing

for chips or corrosion. Remove rust orcorrosion and repaint surfaces.

3. Visually check for leaks in refrigerantpiping.

4. Inspect fan, motor, and controlcontacts. Replace badly worn or erodedcontacts.

Maintenanceperiodicchecklists

5. Inspect the thermal expansion valvesensing bulbs for cleanliness, goodcontact with the suction line, andadequate insulation from ambient air.

WARNINGLive Electrical Components!During installation, testing, servicing,and troubleshooting this equipment, itmay be necessary to work with liveelectrical components. Have aqualified licensed electrician or otherindividual who is properly trained inhandling live electrical componentsperform these tasks. Failure to followall electrical components could resultin death or serious injury.

30 PKG-SVX14A-EN

Maintenance troubleshooting

TroubleshootingUse the following steps and procedures to help correct these common problems.

Problem

The entire unit does not operate.Possible cause

1. Power interruption2. Thermostat not operating3. Electrical panel: a) 24-volt transformerdefective; b) loose wire

Problem

Fan runs but compressor does not start.Possible cause

1. Low voltage2. Remote thermostat3. Compressor contactor open or burned4 .High pressure control cutting out unit5. Refrigerant leak - no gas6. Loose or defective wires.7. Compressor shorted, open or burned8. Defective compressor

Problem

Unit held off by safety.Possible cause

1. Unit cutout on high pressure control, set at385 psig2. Refrigerant leak3. Air restriction, dirty coils4. Partial restriction in refrigerant system5. High pressure control6. TXV power element charge loss7. Loose connection in electrical unit

Problem

Noisy operation.Possible cause

1. Copper tubing vibrating2. Machine vibrating out of level

Remedy

1. Check for blown fuses or tripped circuit breakers. Replace or reset if necessary.2. Setting may be too high; check unit and reset. Thermostat may be out of calibrationor otherwise defective; replace.3. Correct as required.

Remedy

1. Check power supply for voltage outside the acceptable voltage range.2. Check the control unit for loose wires. Firm any loose connections.3. Replace.4. Check for loose wire connection, broken or burned contacts. If defective, replace.5. Locate leak and repair. Recharge unit.6. Tug on wires to see if they will separate from connections. Replace terminals ifnecessary.7. Check for shorts, opens, and grounded. Remove and replace compressor.8. Remove and replace.

Remedy

1. Adjust tubes by bending slightly to firm position without touching other unit parts.2. Level unit base. Fully support base.3. Check and tighten loose screws.4. Tighten screws on fan wheel shaft.5. Adjust wheel position on motor shaft6. Replace fan motor.7. Replace fan bearing.

Remedy

2. See if unit is low on refrigerant charge. Repair leak and recharge unit.3. Verify if the air filter is dirty or has an airflow restriction, and correct problem.4. Locate restriction by inspecting refrigerant lines for temperature changes. Removerestriction, evacuate, and recharge.5. Replace, if defective.6. Evacuate, replace element, recharge.7. Trace and firm up connection.

PKG-SVX14A-EN 31

Maintenance troubleshooting

Problem

Insufficient coolingPossible cause

1. Insufficient air flow due to: a) dirtyevaporator; b) ice on evaporator coils(indicates airflow restriction throughevaporator); c) dirty filter; d)obstructed discharge air intake; e)fan motor not running; f) evaporatorfan or fan wheel slipping on motorshaft2. Heat gain or loss in room exceedsunit capacity3. Defective compressor4. Insufficient refrigerant chargeindicatedby: a) low wattage; b) condenser airoutlet cold5. Overcharge of refrigerant indicatedby high wattage and sweating of thecompressor return line6. Thermostat not set for full cooling7. Insufficient airflow throughcondenserdue to: a) dirty condenser; b) loose belt;c) fan loose on shaft8. Cutout on high pressure9. Only one refrigerant circuitoperationalin 2-circuit units

Problem

Unit short cyclesPossible cause

1. Remote thermostat2. Loose connection in electrical unit3. Thermostat contacts fluttering4. Air flow to evaporator is restricted5. Insufficient charge

Problem

Compressor starts and runs, but fandoesnot run.Possible cause

1. Faulty switch2. Open fan motor coil circuit3. Fan binding on shroud or venturi ring

Remedy

1. Correct as follows: a) clean; b) defrost (using fan operation only); c) clean orreplace filter; d) remove obstruction; e) check electrical system; f) adjust fanposition. Tighten set screw on fan wheel.2. Refer to original load calculations. Recalculate heat gain or loss.3. Replace, if necessary.4. Check refrigerant charge pressure with gauges. If refrigerant is low, rechargesystem.5. Reclaim excess refrigerant.6. Refer to thermostat operating instructions.7. Correct as follows: a) clean coil; b) verify drive is adjusted correctly; c) tighten fanon shaft.8. See that air is flowing and that damper is set properly.9. Reset high pressure cutout on inoperative circuit. Check contactor in inoperativecircuit.

Remedy

1. Repair or replace.2. Trace and repair.3. Repair or replace.4. Flush or blow dirt out of coil.5. Reclaim, evacuate, recharge per nameplate.

Remedy

1. Replace.2. Replace.3. Adjust fan mounting.

32 LPC-SVX01C-EN

typical wiringdiagramMaintenance

LPC-SVX01C-EN 33


34 LPC-SVX01C-EN


LPC-SVX01C-EN 35


a business of American Standard Inc.www.trane.com

For more information contactyour local office or e-mail us [email protected]

Literature Order Number

File Number

Supersedes

Stocking Location

Trane has a policy of continuous product improvement and reserves the right to change design and specificationswithout notice. Only qualified technicians should install and service equipment.

PKG-SVX14A-EN

PL-PKG-SVX14A-EN 0804

SWUB-IOM-2

LaCrosse - Inland

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