floor-by-floor, vertical self-contained system · floor-by-floor, vertical self-contained system...

V-Cube™Floor-by-floor, Vertical Self-contained System

Product Catalog

Sizes: 9 to 150 tons

©2012 Venmar CES Inc.

Catalog VCES-V-CUBE-PC-1 (April 2012) 2

V-Cube™ Table of Contents

Nomenclature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3General Description and Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Unit Construction and Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Engineering Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Application Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21Nominal Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Dimensional Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

V-Cube™ Nomenclature


©Venmar CES Inc. 2012. All rights reserved throughout the world.

Illustrations cover the general appearance of Venmar CES products at the time of publication and VenmarCES Inc. reserves the right to make changes in design and construction at any time without notice.

™® The following are trademarks or registered trademarks of their respective companies: LonTalk from Eche-lon Corporation, BACnet from ASHRAE, FANWALL from Huntair, Inc., EPiC and V-Cube from Mammoth, Inc.

V V Y G S M000 0 L

Model Indicator V − V-Cube

Volume ControlV − Variable air volume C − Constant air volume

CondenserN − No cooling X − Dx without WiSE coil W − Dx with WiSE coil Y − Chilled water cooling Z – Remote condenser A − Airside economizer

Nominal Tonnage

Number of Compressors0 − Air handler T − Tandem compressors H − Heat pump

VoltageF − 208-230/3/60 L − 220-240/3/60 G − 460-480/3/60K − 575/3/60 J − 380-415/3/50

Heating TypeE − Electric H − Hot water S − Steam X − No heat

Frame SizeS − Small M − Medium L − Large T − Tall

Control Panel LocationL – Left handed unitR – Right handed unit


V-Cube™ General Description and Benefits

General DescriptionFully run tested with water/glycol mixture for•single piece shipments.Leak tested with water/glycol mixture for•modular/sectional shipments.Compact footprint and modular design make•units ideal for replacement applications aswell as new construction.ETL listed.•ASHRAE 90.1 compliant.•Available as integrated Dx system with scroll•compressors or air handling units.DDC control system.•Factory packaged communicating controls•and variable frequency drive (VFD).

Flexible DesignThe V-Cube is available in capacities ranging from9 to 150 tons in order to match the requirementsof a broad range of areas and space loads. Unitsoffer a tremendous configuration flexibility tomeet the requirements of your project.

Water cooled Dx system with or without wa-•terside economizer.Air handling units with chilled water cooling.•Available air cooled Dx system with remote•condensing.Available for water source heat pump appli-•cations.Available in fluid/dry cooling applications.•Available in air cooled chiller applications.•

A factory integrated controller offers flexibility forstand alone operation or optional communicationwith common, industry recognized building au-tomation systems.

Ideal for New Construction and TightSpacesV-cube is designed for quiet operation and com-pact design, perfect for floor-by-floor applications.

The packaged design, complete with optional•VFD and factory integrated communicatingcontrols, reduces field labor.A compact footprint allows easy installation•in tight mechanical rooms.Small frame units can be disassembled into•sections to fit through a standard 3 footdoor, with electrical quick connects be-tween sections.

Built in electrical disconnects reduce field•labor and installation costs.

High EfficiencyOperating components are selected to optimizeefficiency, to conserve energy and significantly re-duce operating costs.

The factory mounted VFD is standard with•each unit to optimize fan energy consumption.Optional digital scroll lead compressor pro-•vides superior part load operation (to 10%load) and avoids the need for hot gas bypass.

Quiet OperationExtremely quiet operation allows units to beplaced adjacent to occupied spaces increasing theleasable area.

Heavily attenuated equipment room walls•may be eliminated, reducing installed costs.FANWALL TECHNOLOGY® provides sound•studio quality quiet fan operation and canhelp avoid costly attenuation.Scroll compressors operate smoothly and quietly.•

Superior Comfort and Indoor AirQualityThe V-Cube design and a variety of filtration op-tions provide occupants superior comfort and in-door air quality (IAQ).

Standard double wall construction and dual•sloped stainless steel drain pan help preventmicrobial growth and provide a surface easilycleanable during routine maintenance.Multiple filter options include up to MERV•15, 4” final filters with 4” prefilters or MERV14, 12” final filters with 4” prefilters.Quiet fan and compressor operation con-•tributes to comfortable space conditions.

Easy Maintenance and ServiceUnit tooled access panels allow easy removal•and replacement for routine maintenanceand service.Factory installed filter racks enable easy filter•replacement and help reduce installed costs.FANWALL® system eliminates belt, sheaves,bearing and motor maintenance.Cleanable in place shell and tube condenser,•double wall construction and dual sloped,stainless steel drain pan encourage routinemaintenance for peak performance.


Durable and Reliable OperationV-Cube is designed for long lasting operation withminimum downtime. Fan redundancy provided bythe FANWALL® system allows the unit to operate

at nearly full capacity with one fan down. Operat-ing components are selected for durability andlong life.


V-Cube™ Unit Construction and Components

CabinetThe cabinet walls, access doors, roof and floor areconstructed of an Integrated Thermal Break Fram-ing (ITF)™ system with 3” R12.9 insulation,welded base frame and floor membrane, provid-ing an industrial grade flexible and tough air andwater-tight seal. All openings through the casingare grommeted.

Cabinet allows disassembly of the unit into threesections: compressor and heat exchanger section,blower section and coil section, as well as mixingbox, discharge or inlet plenum (where applicable).Units are provided with a top discharge as stan-dard with rear return. Optional side or front dis-charge are available. Units with cooling coils havea dual sloped stainless steel drain pan.

Access to controls, compressors and supply fans isthrough access doors with tooled access locks andlift tabs. Motor access and blower wheel removalcan be achieved through the access doors on thefront of the unit.

The ETL listed control panel includes contactors,motor protectors, relays and transformers. A dis-connect in the panel is provided for connectingbuilding power to the unit. All branch circuits areindividually protected and include a low voltagecontrol circuit transformer. Motors and compres-sors are protected on all phases. Optional phaseand brown out protection shuts down all motorsif the electrical phases are more than 10% out ofbalance on voltage, voltage is more than 10%under design or on phase reversal. The EPiC™System controller is factory installed and wiredand is capable of operating on a stand alone basisor with common, industry leading protocols. Thecontrol system is pre-wired so that remotestart/stop can be accomplished through the build-ing BMS system via contact closure.

The filter box assembly is removable. Filters areside loaded from the same side as the electricalaccess door. A 2” pleated media panel filter isstandard. Options include a 4” pleated filter witha MERV 13 rating. A 2” prefilter is also available.

All single piece units are factory assembled andtested including leak testing of the coils, pressuretesting of the refrigeration circuit and run testingof the completed unit. Multiple piece or modularunits are leak tested within the factory and fittedwith a nitrogen holding charge for shipment.

Refrigeration SystemEach refrigerant circuit is complete with liquid linemoisture indicator and thermal expansion valvecomplete with an external equalizer line. Units aredesigned for use of R410a refrigerant. Each refrig-eration circuit consists of a scroll compressor,(shell and tube) heat exchanger and airside coil.Water source heat pump units include a reversingvalve. The reversing valve is energized in the cool-ing mode and is fail safe to the heating mode.

Each circuit is equipped with a low and high re-frigerant pressure switch with manual reset,Schrader valves on both the high and low pressuresides and a liquid line filter drier. A liquid line siteglass is standard for shell and tube heat exchangerunits. Refrigerant circuits incorporate refrigerationgrade seamless “Type L” copper tubing.

The compressor is a scroll type with thermal over-load protection. The unit comes complete withmultiple refrigeration circuits where each com-pressor is no larger than 15 horsepower. The op-tional digital scroll compressor is capable ofmodulation from 10%–100% of its capacity. Thecompressors are mounted on rubber vibration iso-lators and are located in a service compartmentthat can be accessed without affecting unit opera-tion. Access is through a tooled access panel.

The shell and tube heat exchangers are mechani-cally cleanable and provided with removable endbells with Victaulic fittings. The condenser isequipped with a large liquid sub-cooler, designed,tested and stamped in accordance withANSI/ASME Boiler and Pressure Vessel Code for arefrigerant side working pressure of 600 psig.Shell and tube condensers are provided with aspring loaded pressure relief valves.

Operating components are selected to optimizeefficiency and maximize performance.


The air coil is designed for use with R410a refrig-erant and constructed of ½” rifled copper tubesmechanically bonded to lanced aluminum fins.Coils have various combinations of row and facesplit circuitry depending on the number of refrig-eration circuits present within the unit.

Optional coils include: economizer, chilled water,hot water, steam, electric heat and refrigerantreheat.

Fan SectionThe fan section consists of the fans, motors, vari-able frequency drives (VFD) and discharge outlet.Airside components are separated from the com-pressor section to limit noise transmission fromthe compressor. Units incorporate either singleplenum fans or FANWALL TECHNOLOGY® with anarray of direct drive, dynamically balanced, airfoilshaped blade plug fans.

Motors are premium efficiency totally enclosedwith sealed and locked bearings and NEMA ratedframe designed for quiet operation. Motors aredesigned for use with VFDs and include bearingprotection rings to reduce bearing frosting, pittingand bearing failure caused by VFD induced volt-ages on the motor shaft.

Units are provided with a top discharge as stan-dard with rear return. Optional side or front dis-charge are available.

Optional VFD with bypass is factory mounted andwired. Redundant VFD with auto-changeover isalso available for mission critical applications.

FANWALL TECHNOLOGY provides sound studioquality quiet operation and provides superior re-dundancy to avoid system downtime.


V-Cube™ Controls

The standard factory integrated EPiC™ Systemcontroller provides control flexibility that can beeasily customized to meet any sequence of opera-tion needs. It is fully capable of operating in a100% stand alone mode or can connect to aBuilding Automation System (BAS) using any oftoday's four leading protocols: BACnet®, Mod-bus®, N2 and LonTalk®. The base controller pro-vides ample input/output capacity, plus support foran expander board if additional I/O capacity is re-quired. The controller provides these key features:

I/O point count: 6 digital outputs, 12 univer-•sal inputs and 6 analog outputs. I/O pointscan be increased by use of an optional I/OFlex Expander.Optional built in protocol support: BACnet•(ARCNET, MS/TP, and PTP modes), Modbus(RTU and ASCII modes supported), N2 orLonTalk.Powerful, high speed 16-bit microprocessor•with 1 MB Flash memory and 1 MB of bat-tery backed RAM.

Built in support through a Rnet port for con-•trol's custom configurable keypad/displayunit, BACview6 (4 line by 40 character perline display), for intelligent sensors.For variable air volume (VAV), constant volume•(CAV) and make-up air (MAU) applications.Used with applications having options requir-ing a greater number of outputs and inputs.As additional options are added an I/O 8160•expander will be needed.

Inputs

Point 6126 Controller Description

UI #1+Pulse

BMS SAT reset, or BMS DSP reset (alternate) or humidity sensor #2(RA, for special comparative enth)

UI #2BMS DSP reset (common duct slave) or humidity sensor #1 (RHfeedback or OA for special enth)

UI #3

RTD/Therm/Dry contact, 0–10 VDC,0–20 mA

Spare, or IAQ (CO2, OA measurement) or humidity (control feedback)

UI #4 Spare, or filter #2 static pressure or BMS DSP/SAT reset (alternate)

UI #5 Spare, or filter #1 static pressure or dirty filter switch #1

UI #6 Spare or building static pressure

UI #7 Duct static pressure (VAV) or airflow switch (CAV)

UI #8Cooling coil leaving air temperature or mixed air temperature (mon-itoring)

UI #9 Condenser water temperature

UI #10 Outside air temperature

UI #11 Entering air temperature or return air temperature

UI #12 Supply air temperature

Rnet Local access port Room air temperature/setpoint/override (RS-Plus)


Inputs

Point 8160 Expander Description

DI #1

Digital

System switch

DI #2 Emergency shut-down

DI #3 Remote start

DI #4 Economizer lockout

DI #5 Cooling lockout

DI #6 Heating lockout

DI #7 Supply fan status

DI #8 Condensate overflow, or water leak (CW) or return fan status

DI #9

Therm/Dry contact, 0–5 VDC (Multi-Plexed DI’s)

High static Low static VFD in bypass

UI #10 Compressor fault #1 Compressor fault #2 Compressor fault #3

UI #11 Compressor fault #4 Compressor fault #5 Compressor fault #6

UI #12 Spare Heating fault #1 SA RH high limit

UI #13 Spare or room air temperature #1 setpoint (Tstat) or slab temperature

UI #14 Spare or room air temperature #1 (Tstat)

UI #15 Circuit #2 head pressure

UI #16 Circuit #1 head pressure

Outputs

Points 6126 Controller Description

UO #14–20 mA, 0–10 VDC

Digital scroll (1–5 VDC), or Cooling source (CW coil), or TCHGBP orHGRH control signal

UO #2 Heating source control signal

UO #3

0–10 VDC

Economizer control signal (WiSE or AISE)

UO #4 WiSE bypass, or head pressure or condenser fan VFD control signal

UO #5Return fan VFD, or humidifier control signal or common duct coor-dination speed signal out

UO #6 Supply fan VFD control signal

DO #1

120 VAC Form C

Spare or heating call #4

DO #2 Start condenser pump, or reversing valve or start return fan

DO #3 Field-link (MWU, NSB or open min OA)

DO #4 Common alarm

DO #5 Heating call #3 or hot gas reheat call #2

DO #6 Heating call #2 or hot gas reheat call #1

Points 8160 Expander Description

DO #1

120 VAC Form A

Supply fan start/stop

DO #2 Heating call #1

DO #3 Cooling call #6 or condenser fan VFD start/stop

DO #4 Cooling call #5 or unload screw compressors

DO #5 Cooling call #4 or load screw compressors

DO #6 Cooling call #3




V-Cube™ Engineering Specifications

GeneralProvide factory fabricated air handling units withcapacity as indicated on the schedule. The unitsconsist of factory assembled components asshown on drawings, including but not limited tofan and motor assemblies, plenums, filters, drainpans, wiring, controls and other accessories asoutlined in the schedule, enclosed in a single ormultiple piece casing as shown on the mechani-cal drawings. Units shall be stand alone con-trolled, except where noted, with all controldevices provided and wired for single pointpower connection by the manufacturer unlessotherwise outlined in the schedule. Units shallhave overall dimensions as indicated and fit intothe space available with adequate clearance forservice as determined by the Engineer. Tags anddecals to aid in service or indicate caution areasshall be provided. Electrical wiring diagrams andInstallation, Operation and Maintenance Instruc-tions Manual (IOM) shall be attached to the con-trol panel access doors within each unit. Unitsshall be UL or ETL listed. Units shall be shipped inone piece or shall be split for shipment to accom-modate freight as required, as shown on mechan-ical drawings.

Unit Base and FloorUnit perimeter base shall be completely weldedand constructed from 4” structural tubing andshall accommodate concrete pad installation asshown on drawings (bolted or riveted bases arenot acceptable). Unit base shall be internally insu-lated with 4” [102 mm], R13.3 fiberglass. Unitbase floor shall be constructed from four-breakformed steel panels, made from 14 gauge hotrolled steel (HRS). Floor panels shall be welded toeach other, creating “I” beams at each floor paneljunction. Floor panel junctions shall be located at14” increments (maximum) or less, in order toprovide floor rigidity and support as required forinternal components. Unit floor panels shall bewelded to perimeter base frame steel tubing. Unitfloor shall be factory covered with top coat indus-trial grade membrane to ensure air and water-tightness as well as walk-on grip. Floor membraneshall be high performance, sprayed, plural compo-nent pure polyurea elastomer, based on amine-terminated polyether resins, amine chainextenders and prepolymers. Floor membrane shallbe flexible, tough, resilient monolithic membrane

with good water and chemical resistance, andshall resist to temperatures up to 250ºF. Floormembrane materials shall be free of solvents andVOCs, shall be suitable for use in compartmentshandling conditioned air and shall comply withthe requirements for the Standard for Heatingand Cooling Equipment, ANSI/UL 1995, third edi-tion, dated 02/18/2005, section 5.10 and section18. Unit base under liners shall be made of 24gauge galvanized steel. Base frame constructionshall include two-stage thermal break, using gas-ket between base floor framing and under linersunderneath and floor membrane on top. Singlewall floor construction with glued and pinned in-sulation and no sub-floor is not acceptable; non-insulated floor construction is not acceptable.Floor constructions which are not air and water-tight are not acceptable. Entire base frame is tobe painted with a phenolic coating for long termcorrosion resistance. Base frame shall be attachedto the unit at the factory. When rigging, baseframe deflection shall be less than 1/360 of theunit length. All major components shall be sup-ported by the base without sagging or pulsating.

Unit CasingUnit wall and roof rigid frame shall consist of 16gauge prepainted galvanized formed steel cornerposts and 16 gauge G90 galvanized formed steel(1” x 2”) intermediate frame posts, providing sta-ble construction allowing for removal of any panelwithout affecting unit structural integrity. Unitswithout framed type of construction are not ac-ceptable. Exterior casing panels shall be attachedto the gasketed (1” x 2” [25 mm x 51 mm]) steelframe with corrosion resistant fasteners. Air han-dling unit casing shall be of the “no-through-metal” design. Casing shall incorporate insulatingthermal breaks as required so that, when fully as-sembled, there is no path of continuous unbrokenmetal to metal conduction from inner to outer sur-faces. Provide necessary support to limit casing de-flection to L/200 of the narrowest paneldimension. If panels cannot meet this deflection,additional internal reinforcing is required. Unitsshall be designed for outdoor or indoor installationas indicated on the schedule. Indoor units weather-ized for outdoor use are not acceptable. All panelseams shall be caulked and sealed for an air-tightunit. Leakage rates shall be less than 1% at designstatic pressure or 9” w.c., whichever is greater.


Selected OptionsExternal spring isolator height saving brackets•(isolators to be provided by others).Neoprene waffle pads (shipped loose) to pre-•vent vibration and noise transmission fromcabinet frame to floor in mechanical equip-ment room (MER).Outdoor construction with sloped roof, rain•gutters and weather hoods.

Double Wall ConstructionUnits shall entirely be made of double wall con-struction. Single wall construction with coated in-sulation is not acceptable. Exposed insulationedges in the airstream are not acceptable. Unitpanels shall be made of 18 gauge galvanizedsteel outer liners and 24 gauge galvanized steelinner liners.

InsulationUnit wall and roof panels shall be insulated with3” thick, R12.9, 2.5 lb/cu. ft. non-compressedmineral wool insulation. Insulation shall meet theerosion requirements of UL 181 facing theairstream and fire hazard classification of 25/50(per ASTM-84 and UL 723 and CAN/ULC S102-M88). All insulation edges shall be encapsulatedwithin the panels. All perforated sections shallhave insulation with black acrylic coating.

Selected OptionsAll insulation located underneath perforated•liners shall be covered with a Melinex® 329PET film.

Access DoorsFull size access door(s) allowing for periodic main-tenance and inspections shall be provided for allserviceable components as shown on the plans.Removable panels are not acceptable. Doors shallbe solid double wall insulated construction. Insu-lation shall be the same as unit panels. Both theinner and outer liners shall be made of the samematerial as unit cabinet outer liner construction.The door hinge assembly shall be die cast zincwith stainless steel pivot mechanism, completelyadjustable. Hinges shall allow doors to open at180º with no shear effect on the hinge side of theperimeter gasket. The doorframe shall be ex-truded aluminum with a built in thermal breakbarrier and full perimeter gasket. The door gasketshall employ a double seal comprising of an adhe-

sive neoprene compressible foam gasket on theouter door panel and an “automotive style” neo-prene bulb gasket fixed onto the inner door framefor out-swing doors, “rippled” foam for in-swingdoors. There shall be a minimum of two heavyduty cast, UV rated, nylon handles per door. Doorhandles shall be operable from both inside andoutside of the unit. On all access doors wheremoving parts could cause injury, an ETL, UL 1995,and OSHA approved tool operated safety latchshall be provided.

Supply Air FANWALL TECHNOLOGY®

(FWT)The FANWALL® system, shall consist of multiple,direct driven, arrangement multiple plenum fansconstructed per AMCA requirements for the dutyspecified (Class I). All fans shall be selected to de-liver the specified airflow quantity at the specifiedoperating total static pressure and specifiedfan/motor speed. The FANWALL array shall be se-lected to operate at a system total static pressurethat does not exceed 90% of the specified fan’speak static pressure producing capability at thespecified fan/motor speed. Each fan/motor“cube” shall include an 11 gauge, A60 galvanizedsteel intake wall, 14 gauge spun steel inlet funnel,and an 11 gauge G90 galvanized steel motor sup-port plate and structure. The fan intake wall, inletfunnel and motor support structure shall be pow-der coated for superior corrosion resistance. Allmotors shall be standard pedestal mounted type,ODP, T-frame motors selected at the specified op-erating voltage, 1,750 rpm and efficiency as speci-fied or as scheduled elsewhere. All motors shallinclude isolated bearings or shaft grounding. Eachfan/motor cartridge shall be dynamically balancedto meet AMCA standard 204-96, category BV-5to meet or exceed Grade 2.5 residual unbalance.The FANWALL array shall be provided withacoustical silencers. The silencers shall not in-crease the fan total static pressure, nor shall theyincrease the airway tunnel length of the air han-dling unit when compared to the same FANWALLunit without the silencer array.

Supply Fan (Single Plenum Fan)The supply fan shall be a plenum fan with a singlewidth/single inlet airfoil type fan secured to a ma-chined ground and polished solid steel shaft. Thewheel shall have an aerodynamically shaped side


wall and a minimum of 12 blades. The shaft shallbe coated with a rust inhibitor and shall be sup-ported by two outboard bearings selected for aminimum 200,000 hours average life. Fan bear-ings shall be easily accessible. Drive shall have V-belts with a minimum service factor of 130%. Fanand motor assembly shall be mounted on an 11gauge hot rolled steel frame supported by springsdesigned for 90–95% isolation efficiency. Fan as-sembly springs are designed to deflect 2” underweight of fully assembled isolation frame. Supplyfan frame is restrained in the vertical and horizon-tal directions in order to withstand seismic forces.

Selected Options150% V-belt service factor.•Grease/lubrication lines for grease nipples on•each fan shaft bearing extended to the dis-charge side of fan assembly to accommodatesingle service access. These fittings may beaccessed via the fan access door(s).

Supply Fan Motor (ODP)The motor shall be heavy duty, open drip-proof(ODP), T-frame, three-phase, 1,800 rpm. Motorshall meet or exceed the efficiencies required bythe Energy Policy Act (EPAct) 10/24/97 (applies to230 volt and 460 volt motors only). The motorshall be mounted on an adjustable heavy dutysliding base. Motor shall have Class F insulation,NEMA B design and a 1.15 service factor.

Supply Fan Motor (TEFC)The motor shall be heavy duty, totally enclosedfan cooled (TEFC), T-frame, three-phase, 1,800rpm. Motor shall meet or exceed the efficienciesrequired by the Energy Policy Act (EPAct) 10/24/97(applies to 230 volt and 460 volt motors only). Themotor shall be mounted on an adjustable heavyduty sliding base. Motor shall have Class F insula-tion, NEMA B design and a 1.15 service factor.

Supply Fan Motor (TEAO)The FANWALL® motor shall be heavy duty, totallyenclosed air-over (TEAO), T-frame, three-phase,1,800 or 3,600 rpm. The motor shall meet or ex-ceed the efficiencies required by the Energy PolicyAct (EPAct) 10/24/97 (applies to 230 volt and 460volt motors only). Motor shall be mounted on anadjustable heavy duty sliding base. Motor shallhave Class F insulation, NEMA B design and a1.15 service factor.

Compressors (Hermetic Scroll)The compressor shall utilize an orbiting scroll withaxial and radial compliance for compression. Thecompressor shall be a high efficiency, suction gascooled, single-speed, hermetic type, with threeTeflon bearings and a cast iron motor frame. Thecompressor shall be mounted outside of theairstream in an insulated compartment on rubber-in-shear isolators. The compressor shall have an oillevel site glass, oil level adjustment fitting, highand low pressure taps and discharge line servicevalve with access port. The compressor shall havea discharge check valve with an internal floatingvalve to silently prevent reverse rotation. The com-pressor shall have a quick acting discharge tem-perature probe, four motor winding temperaturesensors with a solid state module for compressoroverload protection. Other safety devices includea crankcase heater, high and low pressure freezeprotections. Each compressor shall have a sepa-rate and independent refrigeration circuit. The re-frigerant circuit components shall include thecompressor, a shell and tube condenser with inte-gral liquid subcooling, a liquid line service/charg-ing valve, a filter drier and a site glass.

Selected OptionsThe Dx cooling coil shall be protected from•freezing (at all load and operating conditions)by hot gas bypass (HGBP) circuit(s) on the fullleaving side of the evaporator coil. The HGBPline shall have a manual ball valve for refriger-ant flow shutoff.Controls by Others: A minimum run time•function shall prevent compressor cycling bymaintaining compressor operation for a mini-mum of five minutes.Air cooled condensing applications shall in-•clude liquid line and hot gas bypass sole-noids, low pressure switch for pump downcapability. Remote condenser(s) must haveadequate volume for pump down and a sub-cooling circuit.The refrigerant circuit(s) shall be independent•circuit(s) completely piped, tested, dehy-drated and fully charged with oil and refriger-ant R410a.This unit is shipped without a refrigerant•charge due to factory split shipment (or re-quires capability to be field split). After re-assembly, the unit(s) will require pump down


(evacuation) and refrigerant charging. Factoryshall provide dry nitrogen “holding” chargeonly. Refrigerant, additional copper pipingand insulation for field connections shall besupplied by others. Filter drier shall beshipped loose for field installation.“Tandem” compressors: Units with tandem•compressors use two scroll compressors perrefrigeration circuit.Liquid line solenoid valve (screw compres-•sors and/or air cooled condensing applica-tions only).

Electronic Hot Gas Bypass ValveAn electronic hot gas bypass valve (EHGBV) shallallow the unit controller to modulate leaving airtemperature between compressor stages. Theleaving air temperature can typically be controlledto within 1°F. The EHGBV shall be installed in thelead compressor circuit. The valve position is actu-ated with a stepper motor. The steppermotor/valve shall have 6,386 steps. A controlboard shall be supplied to interface between thestepper motor and an analog signal from the unitcontroller. The unit controller shall send an analogsignal of either 0–10 volts or 4–20 milliamps tothe control board. The control board shall in turncontrol the stepper motor thus controlling open-ing of the hot gas valve proportional to the inputfrom the unit controller.

CondenserCondenser(s) shall be mounted on a frame of 11gauge hot rolled steel. Shell and tube con-denser(s) shall be removable header type withmechanically cleanable tubes made to ASMEstandards. Condenser shall be constructed with¾” heavy walled copper water tubes, steel tubesheets, steel heads and high quality gaskets.Epoxy coated tube sheets and heads shall providecorrosion resistance. Condenser shall be de-signed for 600 psig shell (refrigerant) side pres-sure, 300 psig fluid (water) side pressure andhigh pump down capacities to act as a receiver.Water system has been tested at the factory stan-dard of 375 psig. Each condenser shall beequipped with a high pressure relief valve with a0.50” SAE flare connection.

Brazed Plate Heat Exchanger (HeatPump Application)The condenser shall be ASME constructed of type304 stainless steel transfer plates with 316L stain-less steel top and bottom pressure plates. Thepressure plates shall be designed as to preventmoisture and frost freezing. The pressure plateshall include four permanently attached studs toensure a strong unit mounting. The heat transferplates shall be of a high efficiency turbulent de-sign coupled with a low pressure drop and lowfouling rate. In a cooling mode the plates shallform alternating channels where the refrigerantand fluids run counter flow to each other. In aheating mode the fluids run co-current. The heatexchanger shall be chemically cleanable. A strainerwith 16 to 20 meshes shall be field installed priorto the inlet of the heat exchanger. The heat ex-changer shall be UL and CRN listed and optionalEuropean CN listing. The unit shall also be ASMEconstruction and optionally stamped if required.

Reversing Valve (Heat PumpApplication)A four-way, pilot operated, reversing valve shallreverse the refrigerant flow through the waterand air coils in the heating mode. Valve shall havean accessible steel body with a full port pinguided spool for low refrigerant pressure drop.Solenoid valve shall be UL approved for continu-ous operation in all temperature and humidityconditions. Check valves shall allow reverse refrig-erant flow to bypass the opposite cycle expansionvalve and filter drier. A suction accumulator andreceiver tank shall be used for refrigerant man-agement. The receiver tank shall be specially de-signed for reverse flow operation.

Condenser Head Pressure ControlValves An actuator driven modulating water regulatingvalve shall be used on each compressor/condensercircuit to control head pressure. As the head pres-sure increases (detected by factory supplied refrig-erant pressure transducers), the actuators shallmodulate open in order to allow the flow throughthe valve and condensers to increase. As the headpressure decreases (detected by factory suppliedrefrigerant pressure transducers), the actuatorsshall modulate semi-closed in order to allow the


flow through the valve and condensers to de-crease. Upon loss of head pressure, the actuatorswill modulate completely closed in order to isolatethe associated condenser from water flow. Valveis designed for a maximum 400 psig watersidepressure. Head pressure regulating valves shall notbe utilized on units containing a waterside econo-mizer coil (WiSE) as both of these options willhave adverse effects on its counterpart.

Unit Head Pressure Control ValveAn actuator driven modulating water regulatingvalve shall be used on the main water supply tocontrol head pressure. As the average head pres-sure increases (detected by factory supplied refrig-erant pressure transducers), the actuator shallmodulate open in order to allow the flow throughthe valve and condensers to increase. As the aver-age head pressure decreases (detected by factorysupplied refrigerant pressure transducers), the ac-tuators shall modulate semi-closed in order toallow the flow through the valve and condensersto decrease. Upon loss of head pressure throughall circuits, the actuator will modulate completelyclosed in order to isolate the associated condenserfrom water flow. Valve is designed for a maximum300 psig waterside pressure. Head pressure regu-lating valves shall not be utilized on units contain-ing a waterside economizer coil (WiSE) as both ofthese options will have adverse effects on itscounterpart.

Water Flow Switch (Paddle)A paddle type water flow switch shall prove thepresence of flow through the unit before allowingcompressor operation. The switch shall have astainless steel paddle capable of withstandingflow surges. The switch housing shall be made ofbrass capable of withstanding pressures up to2,000 psig. The switch shall be factory piped onthe main water return branch of the unit.

Thermal Dispersion Water Flow SwitchA thermal dispersion water flow switch shall provethe presence of flow through the unit before al-lowing compressor operation. The switch shall beable to sense water flow by measuring heat trans-fer across the cylindrical probe portion of the de-vice. This technology eliminates the need for anymoving parts within the main water piping. Theswitch shall be capable of withstanding pressures

up to 4,365 psig and will be factory piped on themain water return branch of the unit.

Air Cooled CondenserCondenser coil shall be seamless copper tubes,expanded into aluminum fins. Each coil shall beprovided with 15ºF sub cooling circuit. The con-denser coil shall consist of 0.50” OD, 0.017” wallthickness seamless copper tubes expanded into0.006” aluminum fins, heavy gauge seamlesscopper headers and 16 gauge galvanized steelcasings. The condenser coil shall be face-split withthree independent circuits. The mechanical refrig-erant system shall be capable of operating at am-bient conditions down to 45ºF.

Condenser fan shall be a single width/single inletairfoil type fan secured to a machined, groundand polished solid steel shaft. The shaft shall becoated with a rust inhibitor and shall be sup-ported by two outboard bearings selected for aminimum 200,000 hours average life. The inletside bearing shall have the grease fitting extendedto a common location in the blower access area.Drive shall have V-belts with a minimum servicefactor of 130%. Fan and motor assembly shall bemounted on a 14 gauge galvanized steel framesupported by springs designed for 90–99% isola-tion efficiency.

Selected Options0.625” OD tubes.•0.020”, 0.025”, 0.035”, or 0.049” tube wall•thickness.0.008” fin thickness.•304 stainless steel coil casings.•150% V-belt service factor.•Grease/lubrication lines for grease nipples on•each fan shaft bearing extended to the dis-charge side of fan assembly to accommodatesingle service access. These fittings may beaccessed via the fan access door(s).

Condenser Fan MotorThe motor shall be heavy duty, open drip-proof(ODP), T-frame, three-phase, 1,800 rpm. Motorshall be mounted on an adjustable heavy dutysliding base. Motor shall be Class B insulatedNEMA B design and have a 1.15 service factor.

Selected OptionsEnergy efficient motor.•


Totally enclosed, fan cooled (TEFC) design in•lieu of open drip-proof.

Evaporator (Dx) CoilThe direct expansion evaporator coils shall consistof 0.50” OD, 0.017” wall thickness seamless cop-per tubes expanded into 0.006” thick aluminumfins, heavy gauge seamless copper headers, and 16gauge galvanized steel casings. The evaporator coilshall be provided with a distributor with side portfor hot gas bypass and thermostatic expansionvalve with adjustable superheat, “Schraeder” typeflared access fitting and external equalizer line. Thecoil shall be leak tested under warm water with ni-trogen at 400 psig to ensure reliability.

Selected Options0.625” OD tubes.•0.020”, 0.025” or 0.035” tube wall thickness.•0.008” fin thickness.•304 stainless steel coil casings.•

Waterside Economizer (WiSE) CoilThe unit shall be provided with a waterside econ-omizer coil (WiSE) to maximize energy saving. Itshall consist of a water cooling coil directly up-stream of the Dx coil. The WiSE coil shall be 0.50”OD, 0.017” wall thickness seamless copper tubesexpanded into 0.006” thick aluminum fins. Coilheaders shall be copper with copper connectionsand shall be chemically cleanable. The coil shall becontained in its own 16 gauge galvanized steelcasing. The WiSE coil and condensers shall becompletely factory piped including tower watervalve and required controls. Cooling water con-nections to field piping shall be IPS grooved cop-per end to fit IPS pipe.

Selected Options0.625” OD tubes.•0.020”, 0.025” or 0.035” tube wall thickness.•0.008” or 0.010” fin thickness.•304 stainless steel coil casings.•Mechanically cleanable return bends.•

WiSE/Condenser PipingTwo butterfly valves shall be assembled on a teeto control flow through the waterside economizercoil and the condenser(s). Each valve is installedwith couplings on either side of the valve so itmay be removed without disturbing the piping orthe other valve. The valves shall have cast bronze

bodies with a rubber coated disc capable of bub-ble tight shut off at 300 psig. Each valve shall bedriven by a separate analog actuator. The flowcharacteristics of the system are determined bythe sequence of operation of the control system.The sequence of operation follows later in thisdocument.

Selected OptionsA battery backup module and batteries shall•power actuators in the event of a power fail-ure. Typically this is used to close valves dur-ing power failure.

Chilled Water CoilChilled water cooling coils shall consist of 0.50”OD, 0.017” wall thickness seamless copper tubesexpanded into 0.006” aluminum fins. Casing shallbe 16 gauge galvanized steel casings. Headers areseamless hard drawn copper pipe with vent anddrain connections. The coil shall be leak testedunder warm water with nitrogen at 400 psig toensure reliability. Coil shall be rated at 300 psig.Water system has been tested at the factory stan-dard of 375 psig. Chilled water connections tofield piping shall be male copper sweat. See unitdrawing for field piping connection location.Water piping, control valves and valve actuatorsshall be supplied and installed by others.

Selected Options0.625” OD tubes.•0.020”, 0.025” or 0.035” tube wall thickness.•0.008” or 0.010” fin thickness.•304 stainless steel coil casings.•A factory provided two-way valve for modu-•lating flow capacity control. The valve shallbe shipped loose for field installation.A factory provided three-way valve for con-•stant flow capacity control. The valve shall beshipped loose for field installation.

Hot Water Control Valve (Two-way)A two-way factory mounted valve and actuatorshall be supplied to provide modulating control ofthe cooling coil. The valve shall have a chromeplated brass ball with brass stem. The valve shallbe rated for 400 psig working pressure and 200psig close off pressure. The valve, coil and pipingshall be factory leak tested at 375 psig. Field con-nections shall be copper sweat type.


Hot Water Control Valve (Three-way)A three-way factory mounted valve and actuatorshall be supplied to provide modulating control ofthe heating coil. The valve shall have a chromeplated brass ball with brass stem. The valve shallbe rated for 400 psig working pressure and 200psig close off pressure. The valve, coil and pipingshall be factory leak tested at 375 psig. Field con-nections shall be copper sweat type.

Condensate Drain PanThe drain pan shall be 16 gauge, type 304 stain-less steel. Coil drain pan shall have a depth of 2”with insulation beneath it to prevent condensa-tion. Drain pan shall slope in two directions to-wards condensate drain connection (CDC), suchthat no standing water is left in the pan. The CDCshall be 1.25” MPT and located at the casingedge, at the lowest point of drain pan. Drain trappiping shall be field supplied and installed externalto the unit.

Selected OptionsCondensate drain pump (shipped loose for•field installation).

Condensate Overflow switchA condensate overflow switch shall be mountedin the unit condensate drain pan. If the switchsenses a high water level in the drain pan, it shallshut down mechanical cooling and illuminate thelight on the remote status panel.

Hot Water (HW) CoilThe coil shall be 0.50” OD, 0.017” wall thicknessseamless copper tubes mechanically expandedinto 0.006” thick aluminum fins. The coil casingshall be constructed of 16 gauge galvanized steel.Coil headers shall be copper. Header connectionsshall be male, solder type fittings. Headers areequipped with vent and drain connections. Thecoil shall be leak tested under warm water withnitrogen at 400 psig to ensure reliability. Coil shallbe rated at 300 psig. Water system has beentested at the factory standard of 375 psig. Waterpiping, control valves and valve actuators shall besupplied and installed by others.

Selected Options0.625” OD tubes.•0.020”, 0.025” or 0.035” tube wall thickness.•

0.008” or 0.010” fin thickness.•304 stainless steel coil casings.•A factory provided two-way valve for modu-•lating flow capacity control. The valve, coiland piping shall be factory tested at 1.25times the static pressure rating.A factory provided three-way valve for con-•stant flow capacity control. The valve, coiland piping shall be factory tested at 1.25times the static pressure rating.

Hot Water Control Valve (Two-way)A two-way factory mounted valve and actuatorshall be supplied to provide modulating control ofthe heating coil. The valve shall have a chromeplated brass ball with brass stem. The valve shallbe rated for 400 psig working pressure and 200psig close off pressure. The valve, coil and pipingshall be factory leak tested at 375 psig. Field con-nections shall be copper sweat type.

Hot Water Control Valve (Three-way)A three-way factory mounted valve and actuatorshall be supplied to provide modulating control ofthe heating coil. The valve shall have a chromeplated brass ball with brass stem. The valve shallbe rated for 400 psig working pressure and 200psig close off pressure. The valve, coil and pipingshall be factory leak tested at 375 psig. Field con-nections shall be copper sweat type.

Steam CoilThe coil shall be distributing type with 0.625” ODx 0.020” wall thickness copper tubes mechanicallyexpanded into 0.008” thick aluminum fins. Thecoil shall have no more than two rows, with a max-imum of 12 fins per inch. The coil casing shall beconstructed of 16 gauge galvanized steel. Coilsshall be designed for a maximum operating pres-sure of 100 psig (350ºF maximum temperature).Coil headers shall be copper. Header connectionsshall be iron pipe with copper sweat fittings. Steampiping, strainer (trap), control valve and valve actu-ator shall be supplied and installed by others.

Selected Options0.025”, 0.035” or 0.049” tube wall thickness.•1.000” OD tubes.•0.010” tube wall thickness.•304 stainless steel coil casings.•


Electric Heat CoilThe electric heating coil shall be an open typeconsisting of low watt density (35 watts/in2 wiresurface) nickel chromium 80%/20% heating ele-ments housed in a 16 gauge galvanized steel cas-ing. Components shall include all fuses andcontactors (to be located on main unit controlpanel), automatic reset high limit thermal cut-out(for primary safety protection), manually replace-able line break heat limiter (for secondary safetyprotection), airflow switch (pressure differential),and an on/off switch. Temperature control is pro-vided by a Vernier Proportional Controller. One cir-cuit is controlled by Silicon Controlled Rectifier(SCR) to allow proportional heating control forthat circuit. All other circuits are controlled by anelectronic step controller. This allows proportionalcontrol over the full range of the heater. The coilshall not exceed wattage density as specified byUL standards.

Hot Gas Reheat (HGRH) CoilA hot gas reheat coil shall reheat the leaving air offthe cooling coil for humidity control. The leavingair temperature sensor for the Discharge Air Tem-perature Controller (DATC) shall be located down-stream of the reheat coil. If the humidity sensorindicates high humidity then the three-way valvewill open to the hot gas reheat coil. The resultingrise in air temperature will be sensed by the DATCand will enable additional steps of cooling if avail-able to maintain leaving air temperature setpoint.

Side Access Filter RackSide access filter rack shall be constructed of 18gauge galvanized steel. Side access doors shall beprovided for filter service on either side. Installa-tion and removal of filter media does not requiretools or hardware.

Selected Options4” pleated, 30% (MERV 8) efficiency, dispos-•able media.4” pleated, 60% (MERV 11) efficiency, dis-•posable media.4” pleated 30% (MERV 8) efficiency prefilter•and 4” mini-pleat type, 60% (MERV 11) dis-posable final filter. Prefilters are serviceablewithout disturbing the final filter seal.4” pleated 30% (MERV 8) efficiency prefilter•and 4” mini-pleat type, 90% (MERV 15) dis-

posable final filter. Prefilters are serviceablewithout disturbing the final filter seal.4” pleated 30% (MERV 8) efficiency prefilter•and 12” rigid cartridge type, 60% (MERV 11)disposable final filter. Prefilters are serviceablewithout disturbing the final filter seal.4” pleated 30% (MERV 8) efficiency prefilter•and 12” rigid cartridge type, 90% (MERV 14)disposable final filter. Prefilters are serviceablewithout disturbing the final filter seal.Field supplied and installed media.•A magnahelic type differential pressure•gauge shall be provided to monitor filterloading. Gauge shall have a range of 0” w.c.to 2” w.c., with accuracy of 2%.A magnahelic type differential pressure•gauge shall be provided to monitor filterloading. Gauge shall have a range of 0” w.c.to 3” w.c., with accuracy of 2%.One complete spare set of prefilter media.•One complete spare set of filter media.•

Face Load Filter RackFace (front) loading holding frames for high effi-ciency media shall be constructed of 16 gaugegalvanized steel. They are equipped withpolyurethane foam gaskets, fasteners and filtercentering dimples. Installation and removal doesnot require tools or hardware. “Holding clips” areprovided for service/replacement of prefilter with-out disturbing the final filter. Installation and re-moval of filter media does not require tools orhardware.

Selected Options4” pleated, 30% (MERV 8) efficiency, dispos-•able media.4” pleated, 60% (MERV 11) efficiency, dis-•posable media.4” pleated 30% (MERV 8) efficiency prefilter•and 4” mini-pleat type, 60% (MERV 11) dis-posable final filter. Prefilters are serviceablewithout disturbing the final filter seal.4” pleated 30% (MERV 8) efficiency prefilter•and 4” mini-pleat type, 90% (MERV 15) dis-posable final filter. Prefilters are serviceablewithout disturbing the final filter seal.4” pleated 30% (MERV 8) efficiency prefilter•and 12” rigid cartridge type, 60% (MERV 11)disposable final filter. Prefilters are serviceablewithout disturbing the final filter seal.


4” pleated 30% (MERV 8) efficiency prefilter•and 12” rigid cartridge type, 90% (MERV 14)disposable final filter. Prefilters are serviceablewithout disturbing the final filter seal.Field supplied and installed media.•A magnahelic type differential pressure•gauge shall be provided to monitor filterloading. Gauge shall have a range of 0” w.c.to 2” w.c., with accuracy of 2%.A magnahelic type differential pressure•gauge shall be provided to monitor filterloading. Gauge shall have a range of 0” w.c.to 3” w.c., with accuracy of 2%.One complete spare set of prefilter media.•One complete spare set of filter media.•

Magnahelic Filter GaugeAn air filter gauge shall measure pressure dropacross the air filters and indicate when the filtermedia requires replacing. The gauge transmits theeffect of changes in air pressure from a di-aphragm to an indicating pointer by means ofmagnetic linkage without the use of gears orother direct mechanical linkages. Gauge shallhave a range of 0” w.c. to 2” w.c. (or 0” w.c. to3” w.c.), with accuracy of 2%.

Mixing BoxA mixing box designed for ducting mixed (or RA)air and outside air (OA) shall be provided with theunit. The box is constructed of 18 gauge galva-nized steel. Mixing box shall have an access doorto assist in filter removal. Opposed type blade OAand RA dampers and actuators shall be provided.OA and RA dampers shall be low leak type con-structed of airfoil shaped extruded aluminumblades, neoprene blade edge seals and stainlesssteel edges on frame casing permanentlymounted to square damper shafts mounted inpermanently lubricated nylon bearings to assuresmooth operation. Damper locations may includetop, bottom, front and both sides for maximumducting flexibility. See unit drawing for damperopening locations.

Discharge PlenumThe discharge plenum shall be constructed offormed 18 gauge galvanized panels. The plenumshall be insulated with 3” fiberglass acoustical in-sulation. Plenum shall be flush with unit cabinet.Screws 1” x 1/8”, attachment brackets and closed

cell gasket shall be included. Plenum is completewith custom sized discharge openings as shownon submittal drawings. The insulation will be cov-ered with 22 gauge galvanized perforated liners.Perforated liners shall have 3/32” holes, 3/16” oncenter for sound attenuation.

Selected OptionsDischarge plenum insulation shall be covered•with a Melinex® 329 PET film.

Inlet PlenumThe inlet plenum shall be constructed of formed18 gauge galvanized panels. The plenum shall beinsulated with 3” fiberglass acoustical insulation.The inlet plenum is complete with side return airopening as shown on submittal drawings. The in-sulation will be covered with 22 gauge galvanizedperforated liners. Perforated liners shall have 3/32”holes, 3/16” on center for sound attenuation.

Selected OptionsInlet plenum insulation shall be covered with•a Melinex® 329 PET film.

Unit Control PanelThe unit shall have a factory mounted controlpanel with a hinged access door(s). The panelshall contain a terminal block for single-pointpower connection, transformers, fuses and motorcontactors. All wiring shall meet ETL require-ments. The unit shall be ETL approved and havethe ETL label. All other controls as describedbelow shall be factory mounted and wired exceptwhere noted.

The control panel includes the following:

A power terminal block.1.A transformer with 115 volt secondary and2.fuse for control power.A 24 volt control transformer and fuse.3.Necessary relays.4.A 115 volt terminal strip.5.A 24 volt control terminal strip containing6.wired terminals for all controls, numbered inaccordance with the wiring diagram.An isolated 24 volt field-wiring terminal strip.7.An electrical print pocket, which in addition8.to the electrical, print shall contain a start-upform and maintenance instructions.Separately fused legs for fan, compressors9.and accessories.


The above components are in addition to electricalcomponents associated with other sections thatshall be incorporated in the main control panel tofacilitate maintenance and troubleshooting.

Selected OptionsThe DDC controls shall be field supplied and•installed by ATC Contractor.The unit shall bear a New York City Depart-•ment of Buildings’ MEA# (Materials andEquipment Acceptance).

Disconnect SwitchA disconnect switch shall be provided at thepower connection. The disconnect switch shall bea molded case manual (non-automatic) circuitbreaker with a lockable handle and shall be sizedper NEMA codes. The switch shall be locatedwithin the electrical panel with the switch pro-truding through the electrical access door to per-mit unit disconnect without opening the controlpanel door. Wire and conduit entrance will bethrough side of unit at main control panel area.

Circuit BreakerA thermal and magnetic type circuit breaker, en-closed in a molded case switch shall be providedon the incoming line voltage. The circuit breakershall be used in lieu of the manual disconnectswitch.

Motor Start Circuit (CAV Unit)The fan motor shall be supplied with a motor start-ing circuit consisting of fuses, contactor and motoroverload. High voltage field wiring is made to thecontactor. The contactor has a 115 volt holdingcoil and is wired in series with the motor overloadand fan relay. The fan relay is wired to an isolatedterminal suitable for Class II wiring (24 volts).

Motor Start Circuit (VAV Unit)The fan motor shall be supplied with a motorstarting circuit consisting of a motor starter pro-tector and a contactor. High voltage field wiring ismade to the contactor. The contactor has a 115volt holding coil and is wired in series with themotor starter protector and fan relay. The fanrelay is wired to an isolated terminal suitable forClass II wiring (24 volts).

Service Light and Ground FaultInterrupter (GFI)A vapor proof incandescent service light shall belocated in the fan discharge area near the fan ac-cess door. Light switch shall be located adjacentthe door. Light shall be powered by a unitmounted disconnect switch wired to the line sideof the main power disconnect switch to provide“single-point power connection”. A 115 volt con-trol panel mounted GFI service outlet shall be pro-vided. Electrical power to outlet and lights shall beby others.

Phase MonitorA phase monitor shall be supplied to protect themotor/compressor from phase loss, low voltage,voltage unbalance and phase reversal. Whenharmful power conditions exist the phase monitorwill break its output relay after a specified delaywhich shall shut down the affected component(s).The phase monitor automatically resets after ac-ceptable power conditions exists for specified pe-riod of time.

Variable Frequency Drive (VFD)A VFD varies the speed of the fan in order to varythe airflow through the unit. The VFD shall bemounted within the unit casing, separate fromthe air tunnel in a control panel. The louveredcontrol panel door is ventilated with a fan forcooling. All wiring shall be factory installed. TheVFD is factory installed.

Bypass Switch (VFD) (Three-position)The bypass switch utilizes three contactors. Theoutput and bypass contactors are mechanically in-terlocked. A four-position switch shall control thefollowing modes of VFD operation:

VFD: Switch shall connect the input and outputof the drive. Motor speed will be controlled by thedrive. Bypass shall be open.

Bypass: The input and output to the drive shallbe open. The motor will be run directly on line.Fan will operate a design rpm. An auxiliary lowvoltage contact shall be made to the BMS.

Test: The input to the drive shall be closed inorder to power the drive for testing. The driveoutput shall be open and the motor run on by-


pass. The fan shall operate at design rpm. A lowvoltage contact shall be made to signal the BMS.

Off: Input to the drive and motor shall be closed.

Input Line ReactorsMammoth supplied VFDs are solid state, with aPulse Width Modulated (PWM) output waveformutilizing insulated gate bipolar transistors. Driveefficiency is 97% or better at full speed and fullload. A 30-character hand/off/auto alphanumericdisplay for: output frequency (Hz), speed (rpm),motor current, calculated % motor torque, calcu-lated motor power (kW), elapsed time meter (re-settable) and kWh and MWh meter (resettable).VFDs shall have an integral line reactor(s) to re-duce the harmonics to the power line and to in-crease the fundamental power factor.

Refrigeration Connection, Evacuationand Charging (Dx)Bleed off nitrogen holding charge through com-pressor suction and discharge valves. The holdingcharge in the Dx coil may be bled off through the“Schraeder” type valves located on the externalequalizer line of each circuit.

In most cases there will be three refrigerant jointsper circuit: hot gas, liquid and suction. Each linewill be marked with line designation and circuitnumber. Measure and cut refrigeration lines witha tubing cutter. Deburr and clean with emerycloth. Do not use a saw to cut any piping as cop-per filings may be trapped inside piping and willmigrate back to the compressor, which will even-tually lead to compressor failure. The necessarycopper tube, fittings and pipe insulation per appli-cation are supplied for each connection. Somefinal cutting of pipe may be necessary during fit-ting. Fit the pipe and reinstall the elbows or cou-plings (and pipe insulation where applicable).

Before brazing, connect a constant flow of dry ni-trogen to the entire refrigerant circuit. The nitro-gen flow must be semi-restricted at the pointwhere it exits the system to prevent oxidation in-side the refrigerant lines. Clean and flux all joints.Braze (hard solder) all connections.

Cut the liquid line(s) to fit the filter drier(s). Brazein the filter drier(s) using the same procedure de-scribed above.

Using 200 psig dry nitrogen (175 psig maximumon applications equipped with screw compressors),check the entire system for leaks. Evacuate the sys-tem using a refrigeration vacuum pump. Use a mi-cron gauge and pump down to 50 microns.Evacuate and charge circuits with R410a, one tosix depending on model. The amount of chargefor each circuit shall be stated on the unit label.


V-Cube™ Application Considerations

System TypesV-Cube is generally used in three types of applica-tions:

Cooling with or without heating.•Water source heat pump.•Make-up air units.•

Sound ConsiderationsV-Cube is often the heart of a floor-by-floor sys-tem and is designed for extremely quiet opera-tion. This allows units to be placed adjacent tooccupied spaces, increasing the leasable area andit can eliminate the need for heavily attenuatedequipment room walls to reduce installed costs.However, if your application permits, the follow-ing are generally accepted design guidelines in-tended to achieve optimum acoustic performanceof any HVAC system.

Equipment Room LocationIt is common to locate the mechanical equipmentroom (MER) near service areas such as elevators,bathrooms and other electrical service rooms. De-signing a core area that surrounds the MER withother service areas provides a buffer for occupiedspaces. It is recommended that the return airsideof the unit be located away from critical soundtransmission paths.

Wall ConstructionThe MER wall construction often depends uponthe design criteria and layout of the building. Ifthe MER is adjacent to the occupied space, a wallwith two layers of drywall on either side of an in-sulation filled stud cavity is recommended. Light-weight concrete block would also be acceptable.All MER walls should run from floor-to-floor andbe built air-tight to prevent sound transmissionthrough the ceiling cavity to occupied areas.

Ducts/PlenumThe design of the supply and return duct systemcan greatly affect the sound levels of the installa-tion. If supply ducts are to be run in multiple di-rections, a plenum with turning vanes should beused to distribute airflow. The plenum can reducesound power distribution into each individualduct, reducing associated noise. Use smooth tran-sitions to avoid turbulence. As a safeguard, supplyducts should run over noncritical spaces wheneverpossible. Ducts should be insulated with 2” of

fiberglass insulation extending 25 feet from theplenum or unit. Ducts should be isolated fromwalls and flexible duct connections should be lo-cated just inside the MER wall.

The return duct should have at least one turn in itor should have a return chase in the MER wall toreduce sound transmission. It is also recom-mended that the return path be at least 12 feetlong to attenuate the low frequency bands. Chaseor return ducts should also be lined with 2” offiberglass insulation to reduce sound transmission.Optimum duct velocity is between 800 and 1,500fpm. Openings of the return air should be keptaway from the corners of the equipment room.

Isolation RequirementsSince the V-Cube unit is internally isolated, exter-nal isolation requirements are minimal. In mostcases, using between six and eight rubber isola-tion pads underneath the rails is sufficient. If theunit is located on long, unsupported steel pans,careful evaluation of system dynamics is required.Normal applications do not require isolation of

V-Cube units can be applied in cooling with orwithout heating, water source heat pump ormake-up air applications


water or refrigerant lines from the unit, althoughthe lines should be isolated from the MER wallsthey pass through. For seismic zones, bracketsshould be used to secure the unit to the buildingstructure.

Condensate TrapA condensate trap that has a depth of at least 2.5times the expected negative static pressure of theunit must be provided. The trap may be con-structed of PVC, copper or steel and can be rundirectly to a floor drain. If a floor drain is not avail-able, the run must slope at least 0.125” per foot.Please refer to the V-Cube IOM (VCES-V-CUBE-IOM-1) for more details.

Condenser Water Piping RequirementsMinimum requirements for condenser water pip-ing include a strainer and shut-off valve on thesupply line. For balancing purposes, balancingvalves as well as pressure and temperature taps onsupply and return lines can be very helpful. Unitsare typically piped in a reverse return system.

Temperature and Flow RequirementsA typical V-Cube™ is designed to have a constantcondenser water flow through the unit. Optionalsystems, which decrease the flow through theunit during waterside economizer operation, arealso available. For the majority of applications, en-ergy savings can be maximized by varying coolingtower fan operation to lower condenser watertemperatures. This effectively reduces head pres-sure in the compressors. This method is an alter-native to using variable volume pumpingmethods. In order for the compressors to operateproperly, the entering water temperature (EWT) tothe condensers must be at least 60ºF [16ºC]. Forunits without a waterside economizer (WiSE) coil,provisions must be made to maintain the con-denser water temperature to 60ºF [16ºC] in orderfor the compressor to start. Optional head pres-sure control values are available on units withoutWiSE coil.

Water TreatmentSince cooling towers collect a great deal of con-taminants in the condenser water, strainers are es-sential in preventing premature fouling of thewaterside heat exchanger. Consult a local watertreatment expert to control biological contami-

nants in the system. A periodic maintenance sched-ule should be established to test water samples,measure the water treatment chemical residual inthe circulating water, check the strainer for clog-ging and other items in the cooling tower manu-facturer’s operation and maintenance instructions.

Corrosion ConsiderationsIf the building is piped primarily in copper, anysmall run of steel piping should be avoided, as thesteel shall quickly become a sacrificial anode tothe copper. If unsure of the condenser water con-ditions or the possibility of galvanic corrosions, adielectric fitting should be used.

Freeze ProtectionAs a preventative measure Venmar CES factorytests each unit with a 40% glycol solution to pro-tect any liquid from freezing. Freeze protectionmust be provided during the construction processto prevent any water from freezing. A glycol solu-tion must also be used for any field testing infreezing conditions.

WiSE Piping SchematicThe waterside economizer coil is piped in serieswith the condensers. The most common arrange-ment uses two butterfly valves to control waterflow. These valves can be controlled independentlyor simultaneously. The standard configuration hasthe two valves connected by linkage such that asone valve opens the other valve closes. This oper-ates similar to a three-way diverting valve withnearly constant flow through the unit at all times.The optional configuration has each valve drivenby a separate actuator. The separate control allowsone valve to operate as a two-position valve,opening and closing the bypass around the econo-mizer coil. The other valve is modulated to controlflow through the coil to control leaving air temper-ature. This method varies the flow of condenserwater through the condensers when the unit isoperating in the economizer mode. If close-up ofwater flow is required for unit shut-down, op-tional valve and actuator are added to the system.


Static Pressure Sensor Location andVAV System RequirementsMinimum Airflow RequirementsA VAV system should be set up so that the unit isnot expected to supply mechanical cooling withless than 25% of design airflow. If this minimumairflow rate is not maintained, the controller maynot be able to correctly control the stages of re-frigeration and liquid slugging or freezing of coilsmay occur. If the unit utilizes a VFD, there shouldbe a means of opening adequate VAV boxes. Thisshall ensure that the unit does not trip on over-pressure when running at full speed, because themotor has been put in bypass.

The static pressure sensor of the units needs to becarefully placed. It should be located downstreamfrom the unit in the duct, and in a place wherethe pressure is not affected by turbulence. It mustalso be located so that adequate airflow is sup-plied to all VAV boxes at all building load condi-tions, without causing high static pressure trips atthe units. The sensor should typically be locatedtwo-thirds down the longest run of ductwork.

Multiple Units on a Common DuctThe standard control system is not designed tohandle multiple units on a common duct. An op-tional control system is designed so that one mas-ter unit controls the static pressure in the ductwith the other units as slaves.

WiSE coil

Dx coil

WiSE piping schematic


V-Cube™ Nominal Capacity

Small Frame with Plenum FanCapacity @ AHRI Conditions with 6-row / 8-FPI Dx Cooling Coil @ 500 FPM

Fan Data Condenser Data Cooling Performance

Airflow(CFM)

Diameter EWT LWT GPMEAT

(db/wb)LAT

(db/wb)

TotalCapacity(MBH)

SensibleCapacity(MBH)

CoolingTons

Compressors EER

13,540 27.0 85.0 95.0 112.2 80.0/67.0 56.9/56.3 463.0 337.0 38.6 2 @ 15 HP 14.0

Small-tall Frame with Plenum FanCapacity @ AHRI Conditions with 6-row / 8-FPI Dx Cooling Coil @ 500 FPM


Airflow(CFM)


(db/wb)LAT

(db/wb)

TotalCapacity(MBH)


CoolingTons

Compressors EER

16,600 27.0 85.0 95.0 160.6 80.0/67.0 54.6/54.0 671.0 455.0 55.9 3 @ 15 HP 13.7

Medium Frame with Plenum FanCapacity @ AHRI Conditions with 6-row / 8-FPI Dx Cooling Coil @ 500 FPM


Airflow(CFM)


(db/wb)LAT

(db/wb)

TotalCapacity(MBH)


CoolingTons

Compressors EER

22,200 36.5 85.0 95.0 214.2 80.0/67.0 54.5/53.9 906.0 612.0 75.5 4 @ 15 HP 14.9

Medium-tall Frame with Plenum FanCapacity @ AHRI Conditions with 6-row / 8-FPI Dx Cooling Coil @ 500 FPM


Airflow(CFM)


(db/wb)LAT

(db/wb)

TotalCapacity(MBH)


CoolingTons

Compressors EER

27,800 36.5 85.0 95.0 229.5 80.0/67.0 57.1/56.5 936.0 688.0 78.0 4 @ 15 HP 13.8

Large Frame with Plenum FanCapacity @ AHRI Conditions with 6-row / 8-FPI Dx Cooling Coil @ 500 FPM


Airflow(CFM)


(db/wb)LAT

(db/wb)

TotalCapacity(MBH)


CoolingTons

Compressors EER

27,800 40.25 85.0 95.0 306.0 80.0/67.0 52.3/51.7 1,291.0 831.0 107.6 6 @ 15 HP 14.8

Large-tall Frame with Plenum FanCapacity @ AHRI Conditions with 6-row / 8-FPI Dx Cooling Coil @ 500 FPM


Airflow(CFM)


(db/wb)LAT

(db/wb)

TotalCapacity(MBH)


CoolingTons

Compressors EER

34,700 40.25 85.0 95.0 408.0 80.0/67.0 51.4/50.8 1,624.0 1,039.0 135.3 8 @ 15 HP 14.3


Small Frame with FWTCapacity @ AHRI Conditions with 6-row / 8-FPI Dx Cooling Coil @ 500 FPM or Max FWT CFMFan Data Condenser Data Cooling Performance

Airflow(CFM)

Fan Diameter

EWT LWT GPMEAT

(db/wb)LAT

(db/wb)

TotalCapacity(MBH)


CoolingTons

Compressors EER

15,500 2 x 18” 85.0 95.0 117.3 80.0/67.0 58.2/57.6 472.0 365.0 39.3 2 @ 15 HP 13.4

Small-tall Frame with FWTCapacity @ AHRI Conditions with 6-row / 8-FPI Dx Cooling Coil @ 500 FPM or Max FWT CFMFan Data Condenser Data Cooling Performance

Airflow(CFM)

Fan Diameter

EWT LWT GPMEAT

(db/wb)LAT

(db/wb)

TotalCapacity(MBH)


CoolingTons

Compressors EER

20,900 3 x 16” 85.0 95.0 175.9 80.0/67.0 57.1/56.5 699.0 517.0 58.3 3 @ 15 HP 13.4

Medium Frame with FWTCapacity @ AHRI Conditions with 6-row / 8-FPI Dx Cooling Coil @ 500 FPM or Max FWT CFMFan Data Condenser Data Cooling Performance

Airflow(CFM)

Fan Diameter

EWT LWT GPMEAT

(db/wb)LAT

(db/wb)

TotalCapacity(MBH)


CoolingTons

Compressors EER

22,200 4 x 16” 85.0 95.0 219.3 80.0/67.0 54.7/54.1 890.0 607.0 74.2 4 @ 15 HP 14.6

Medium-wide Frame with FWTCapacity @ AHRI Conditions with 6-row / 8-FPI Dx Cooling Coil @ 500 FPM or Max FWT CFMFan Data Condenser Data Cooling Performance

Airflow(CFM)

Fan Diameter

EWT LWT GPMEAT

(db/wb)LAT

(db/wb)

TotalCapacity(MBH)


CoolingTons

Compressors EER

34,700 6 x 16” 85.0 95.0 244.8 80.0/67.0 59.6/58.9 922.0 765.0 76.8 4 @ 15 HP 13.0

Large Frame with FWTCapacity @ AHRI Conditions with 6-row / 8-FPI Dx Cooling Coil @ 500 FPM or Max FWT CFMFan Data Condenser Data Cooling Performance

Airflow(CFM)

Fan Diameter

EWT LWT GPMEAT

(db/wb)LAT

(db/wb)

TotalCapacity(MBH)


CoolingTons

Compressors EER

34,700 6 x 16” 85.0 95.0 418.2 80.0/67.0 52.1/51.5 1,626.0 1,045.0 135.5 8 @ 15 HP 13.9

Large-wide Frame with FWTCapacity @ AHRI Conditions with 6-row / 8-FPI Dx Cooling Coil @ 500 FPM or Max FWT CFMFan Data Condenser Data Cooling Performance

Airflow(CFM)

Fan Diameter

EWT LWT GPMEAT

(db/wb)LAT

(db/wb)

TotalCapacity(MBH)


CoolingTons

Compressors EER

41,650 8 x 16” 85.0 95.0 428.4 80.0/67.0 53.9/53.2 1,771.0 1,176.0 147.6 8 @ 15 HP 14.7


V-Cube™ Unit Dimensions

Small Frame with Plenum FanSection/Module Height Width Length

Dx blower 51.0 82.0 35.0

AHU blower 81.0 82.0 35.0

Coil section 81.0 82.0 35.0

Ext. coil section 81.0 82.0 42.0

Dx access spacer 81.0 82.0 24.0

No access spacer 81.0 82.0 12.0

Compressor section 30.0 82.0 35.0

Mixing box 81.0 82.0 41.0

Ext. mixing box 81.0 82.0 49.0

Small-tall Frame with Plenum FanSection/Module Height Width Length

Dx blower 57.0 82.0 35.0

AHU blower 93.0 82.0 35.0

Coil section 93.0 82.0 35.0





Mixing box 93.0 82.0 41.0

Ext. mixing box 93.0 82.0 49.0

Medium Frame with Plenum FanSection/Module Height Width Length

Dx blower 63.0 103.0 44.0

AHU blower 93.0 103.0 44.0

Coil section 93.0 103.0 35.0





Mixing box 93.0 103.0 46.0

Ext. mixing box 93.0 103.0 55.0

Medium-tall Frame with Plenum FanSection/Module Height Width Length

Dx blower 82.0 103.0 44.0

AHU blower 112.0 103.0 44.0

Coil section 112.0 103.0 35.0





Mixing box 112.0 103.0 46.0

Ext. mixing box 112.0 103.0 55.0

Large Frame with Plenum FanSection/Module Height Width Length

Dx blower 65.0 125.0 56.0

AHU blower 95.0 125.0 56.0

Coil section 95.0 125.0 48.0




Mixing box 95.0 125.0 53.0

Ext. mixing box 95.0 125.0 62.0

Large-tall Frame with Plenum FanSection/Module Height Width Length

Dx blower 82.0 125.0 56.0

AHU blower 112.0 125.0 56.0

Coil section 112.0 125.0 48.0




Mixing box 112.0 125.0 53.0

Ext. mixing box 112.0 125.0 62.0


Small Frame with FWTSection/Module Height Width Length

Dx blower 51.0 100.0 35.0

AHU blower 81.0 100.0 35.0

Coil section 81.0 100.0 35.0





Mixing box 81.0 100.0 41.0

Ext. mixing box 81.0 100.0 49.0

Small-tall Frame with FWTSection/Module Height Width Length

Dx blower 57.0 121.0 35.0

AHU blower 93.0 121.0 35.0

Coil section 93.0 121.0 35.0





Mixing box 93.0 121.0 41.0

Ext. mixing box 93.0 121.0 49.0

Medium Frame with FWTSection/Module Height Width Length

Dx blower 82.0 103.0 44.0

AHU blower 112.0 103.0 44.0

Coil section 112.0 103.0 35.0





Mixing box 112.0 103.0 46.0

Ext. mixing box 112.0 103.0 55.0

Medium-tall Frame with FWTSection/Module Height Width Length

Dx blower 82.0 124.0 44.0

AHU blower 112.0 124.0 44.0

Coil section 112.0 124.0 35.0





Mixing box 112.0 124.0 46.0

Ext. mixing box 112.0 124.0 55.0

Large Frame with FWTSection/Module Height Width Length

Dx blower 82.0 125.0 56.0

AHU blower 112.0 125.0 56.0

Coil section 112.0 125.0 48.0




Mixing box 112.0 125.0 53.0

Ext. mixing box 112.0 125.0 62.0

Large-wide Frame with FWTSection/Module Height Width Length

Dx blower 82.0 145.0 56.0

AHU blower 112.0 145.0 56.0

Coil section 112.0 145.0 48.0




Mixing box 112.0 145.0 53.0

Ext. mixing box 112.0 145.0 62.0


Dimensional Drawing – Small Frame with Plenum Fan


Dimensional Drawing – Small Frame with Inlet and Plenum Fan


Dimensional Drawing – Small-tall Frame with Plenum Fan


Dimensional Drawing – Small-tall Frame with Inlet and Plenum Fan


Dimensional Drawing – Medium Frame with Plenum Fan


Dimensional Drawing – Medium Frame with Inlet and Plenum Fan


Dimensional Drawing – Medium-tall Frame with Plenum Fan


Dimensional Drawing – Medium-tall Frame with Inlet and Plenum Fan


Dimensional Drawing – Large Frame with Plenum Fan


Dimensional Drawing – Large Frame with Inlet and Plenum Fan


Dimensional Drawing – Large-tall Frame with Plenum Fan


Dimensional Drawing – Large-tall Frame with Inlet and Plenum Fan


Dimensional Drawing – Small Frame with FWT


Dimensional Drawing – Small Frame with Inlet and FWT


Dimensional Drawing – Small-tall Frame with FWT


Dimensional Drawing – Small-tall Frame with Inlet and FWT


Dimensional Drawing – Medium Frame with FWT


Dimensional Drawing – Medium Frame with Inlet and FWT


Dimensional Drawing – Medium-wide Frame with Inlet and FWT


Dimensional Drawing – Large Frame with FWT


Dimensional Drawing – Large Frame with Inlet and FWT


Dimensional Drawing – Large-tall Frame with FWT


Dimensional Drawing – Large-tall Frame with Inlet and FWT

©2012 Venmar CES Inc.VCES-V-CUBE-PC-1

April 2012

Venmar CES Inc. has a policy of continuous improvement and reservesthe right to change design and specifications without notice.

[email protected]

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