McQuay Enfinity Horizontal Water Source Heat Pumps R …lit.daikinapplied.com/bizlit/DocumentStorage/WaterSourceHeatPump/... · McQuay® Enfinity™ Horizontal Water Source Heat Pumps

Installation & Maintenance Data

Group: WSHP

Part Number: 910104826

Date: October 2009

IM 1049

©2009 McQuay International

®

McQuay® Enfinity™ Horizontal Water Source Heat PumpsR-410A RefrigerantModel CCH, CCW Unit Sizes 007 – 060

Page 2 of 36 / IM 1049

Note: For illustration purposes only. Not all options available with all models. PleaseconsultMcQuaySalesRepresentativeforspecificavailability.

W CCH 1 019 B E Y L S

Product CategoryW = WSHP

Product IdentifierWCCH = Ceiling Mounted/Standard RangeWCCW = Ceiling Mounted/Geothermal

Design Series1 = A Design2 = B Design3 = C Design4 = D Design

Nominal Capacity007 = 7,000 BTU/h009 = 9,000 BTU/h012 = 12,000 BTU/h019 = 19,000 BTU/h024 = 24,000 BTU/h030 = 30,000 BTU/h036 = 36,000 BTU/h042 = 42,000 BTU/h048 = 48,000 BTU/h060 = 60,000 BTU/h

Discharge AirS = StraightE = End

Return AirL = LeftR = Right

Future(None)

VoltageA = 115/60/1E = 208-230/60/1F = 208-230/60/3J = 265/60/1K = 460/60/3L = 575/60/350 HzM = 230/50/1N = 380/50/3

ControlsB - MicroTech IIIC - MicroTech III With LonWorksD - MicroTech III With BACnet

Enfinity™ Horizontal Ceiling Unit (Size 007 - 060)

Table of ContentsModelNomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 HorizontalCeilingUnitCCH-CCW . . . . . . . . . . . . . . . 2

Receiving,Storage&Handling . . . . . . . . . . . . . . . . . . . . . 3 UnitLocation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 FilterAccess . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 AirDischargeConversion . . . . . . . . . . . . . . . . . . . . . 5-6 Ductwork&Attenuation . . . . . . . . . . . . . . . . . . . . . . 7-8 VentilationAir . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 ElectricalData . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 FanAssembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-10 Cleaning&Flushing . . . . . . . . . . . . . . . . . . . . . . . . .10-11 Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-12 OperatingLimits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 AdditionalInformationforInitialStart-up . . . . . . . . . . 12

Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-19 MicroTechIIIControllerTerminalLocations &Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-14 MicroTechIIIUnitController . . . . . . . . . . . . . . . . . . . 15 RemoteResetFeature . . . . . . . . . . . . . . . . . . . . . . . . . . 15 MicroTechIIIControllerwithLonModule . . . . . . . . . 16 MicroTechIIIControllerwithBACnetModule . . . . . 17 MicroTechIIIControllerwithLonModuleon BoardDiagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

ChangingPSCFanMotorSpeed . . . . . . . . . . . . . . . . 19-20 (Optional)ECMMotor-FanSpeed . . . . . . . . . . . . . . 20 Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

TypicalWiringDiagrams . . . . . . . . . . . . . . . . . . . . . . 21-25 MicroTechIIIUnitControllerwithPSCMotor

–208/230-60-1UnitSizes019-060 . . . . . . . . . . . . . . . 21 MicroTechIIIUnitControllerwithPSCMotor

–208/230/460/575-60-3UnitSizes019-060 . . . . . . . . 22 MicroTechIIIUnitControllerwithECMMotor

–208/230-60-3UnitSizes019-060 . . . . . . . . . . . . . . . 23 MicroTechIIIUnitControllerwithECMMotor

–208/230-60-1UnitSizes019-060 . . . . . . . . . . . . . . . 24 MicroTechIIIUnitControllerwithECMMotorand

OptionalCommunicationModule–460-60-3 . . . . . . . 25

AdditionalAccessories(General) . . . . . . . . . . . . . . . . 26-28 Thermostats&TemperatureSensors . . . . . . . . . . . 26-27 PumpRestartRelayKit . . . . . . . . . . . . . . . . . . . . . . . . 28 MultipleUnitControl . . . . . . . . . . . . . . . . . . . . . . . . . 28

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29-33 TheinandoutsofR-410A . . . . . . . . . . . . . . . . . . . . . . 29 TroubleshootingtheRefrigerationCircuit . . . . . . . . . . 30 TypicalRefrigerationCycles . . . . . . . . . . . . . . . . . . . . 31 TroubleshootingtheWSHPUnit . . . . . . . . . . . . . . . . . 32 TroubleshootingtheMicroTechIIIUnitController . . . 33

IM 1049 / Page 3 of 36

IMPORTANTThis product was carefully packed and thoroughly inspected before leaving the factory. Responsibility for its safe delivery was assumed by the carrier upon acceptance of the shipment. Claims for loss or damage sustained in transit must therefore be made upon the carrier as follows:VISIBLE LOSS OR DAMAGEAny external evidence of loss or damage must be noted on the freight bill or carrier’s receipt, and signed by the carrier’s agent. Failure to adequately describe such external evidence of loss or damage may result in the carrier’s refusal to honor a damage claim. The form requiredtofilesuchaclaimwillbesuppliedbythecarrier.CONCEALED LOSS OR DAMAGEConcealed loss or damage means loss or damage which does not become apparent until the product has been unpacked. The contents may be damaged in transit due to rough handling even though the carton may not show external damages. When the damage is discovered upon unpacking, make a written request for inspection by the carrier’sagentwithinfifteen(15)daysofthedeliverydateandfileaclaimwiththecarrier.

WARNINGThe installer must determine and follow all applicable codes and regulations. This equipment presents hazards of electricity, rotating parts, sharp edges, heat and weight. Failure to read and follow these instructions can result in property damage, severe personal injury or death. This equipment must be installed by experienced, trained personnel only.

Receiving and Storage

Uponreceiptoftheequipment,checkcartonforvisibledamage .Makeanotationontheshipper’sdeliveryticketbeforesigning .Ifthereisanyevidenceofroughhandling,immediatelyopenthecartonstocheckforconcealeddamage .Ifanydamageisfound,notifythecarrierwithin48hourstoestablishyourclaimandrequesttheirinspectionandareport .TheWarrantyClaimsDepartmentshouldthenbecontacted .Donotstandortransportthemachinesonend .Forstoring,eachcartonismarkedwith“up”arrows .Intheeventthatelevatortransfermakesup-endedpositioningunavoidable,donotoperatethemachineuntilithasbeeninthenormaluprightpositionforatleast24hours .Temporarystorageatthejobsitemustbeindoor,completelyshelteredfromrain,snow,etc .Highorlowtemperaturesnaturallyassociatedwithweatherpatternswillnotharmtheunits .Excessivelyhightemperatures,140°F(60°C)andhigher,maydeterioratecertainplasticmaterialsandcausepermanentdamage .

Sharp edges can cause personal injury. Avoid contact with them.

CAUTION

Pre-Installation

1 . Topreventdamage,donotoperatethisequipmentforsupplementaryheatingandcoolingduringtheconstructionperiod .

2. Inspectthecartonforanyspecifictaggingnumbersindicatedbythefactoryperarequestfromtheinstallingcontractor .Atthistimethevoltage,phaseandcapacityshouldbecheckedagainsttheplans .

3 . Checktheunitsizeagainsttheplanstoverifythattheunitisbeinginstalledinthecorrectlocation .

4 . Beforeinstallation,checktheavailableceilingheightversustheheightoftheunit .

5 . Notethelocationandroutingofwaterpiping,condensatedrainpiping,andelectricalwiring .Thelocationsoftheseitemsareclearlymarkedonsubmittaldrawings .

6. Theinstallingcontractorwillfinditbeneficialtoconferwithpiping,sheetmetal,andelectricalforemenbeforeinstallinganyunit .

Note: Check the unit data plate for correct voltage with the plans before installing the equipment. Also, make sure all electrical ground connections are made in accordance with local code. 7 . Thecontractorshallcovertheunitstoprotectthe

machinesduringfinishingofthebuilding.Thisiscriticalwhilesprayingfireproofingmaterialonbarjoists,sandblasting,spraypaintingandplastering .Ifplasticfilmisnotavailable,theshippingcartonmaybemodifiedtocovertheunitsduringconstruction.

8 . Removeallshippingblocksinthefanwheel .

9. Changetheairflowdirectionfromstraightdischargetoenddischargeorviceversabeforetheunitisinstalledintheceiling .Refertothepage5forAirDischargeConversionInstructions .

Page � of 36 / IM 10�9

UNIT DIMENSIONS(mm) SIZE A B C D E 007–009 ��5 86� 559 86� 508 012 ��5 1016 559 1016 508 019–024 ��5 1016 559 1016 508 030–036 �70 1168 58� 1168 533 042–060 6�8 1321 762 1321 711

UNIT DIMENSIONS(INCHES) SIZE A B C D E 007–009 17.5 3� 22 3� 20 012 17.5 �0 22 �0 20 019–024 17.5 �0 22 �0 20 030–036 18.5 �6 23 �6 21 042–060 25.5 52 30 52 28

FilterAccessEach unit is shipped with a filter bracket for side filter removal. For bottom removal push the filter up into top bracket to gain clearance of bottom bracket and remove the filter. Also, a sheet metal duct filter retainer can be fabricated when return air duct work is used.

Figure 1: Hanger Bracket Location Dimensions - Sizes 007 thru 060

Figure 2: Hanger Bracket Details - Sizes 007 thru 060

UnitLocation1. Locate the unit in an area that allows for easy

removal of the filter and access panels. Leave a minimum of 18" of clearance around the heat pump for easy removal, and to perform routine maintenance, or troubleshooting. Provide sufficient room to make water, electrical and duct connections.

2. The contractor should make sure that adequate ceiling panel access exists, including clearance for hanger brackets, duct collars and fittings at water and electrical connections.

3. Allow adequate room below the unit for a condensate trap and do not locate the unit above pipes.

4. Each unit is suspended from the ceiling by four threaded rods. The rods are attached to the unit corners by a hanger bracket through a rubber isolator.

Do not use rods smaller than shown in Figure 2. The rods must be securely anchored to the ceiling or to the bar joists.

5. Each unit is furnished with a hanger kit. The kit is shipped unassembled and includes hanger brackets, rubber isolators, washers, bolts and lock washers. Lay out the threaded rods per the dimension in Figures 1 and 2.

6. When attaching the hanger rods to the unit, a double nut is recommended since vibration could loosen a single nut. The installer is responsible for providing the hex nuts when installing hanger rods.

7. Leave minimum 3" (76 mm) extra threaded rod below the double nuts or minimum 3" (76 mm) clearance between top of unit and ceiling above to facilitate top panel removal for servicing.

3/8" Threaded Rod(By Others)

Vibration Isolator

Washer

Hex Nuts(By Others)

Bolt & Lock Washer

B

CoilAirflow

E C

D

Comp

ControlBox

FanAssembly

A

CAUTION

IM 1049 / Page 5 of 36

Air Discharge ConversionUnitsizes007thru060arestockedasstraightdischarge .Astraightdischargeunitmaybeconvertedtoanenddischargebydoingthefollowing:

Note: The information covered in this section of the blower assembly orientation is typical of McQuay units. Regardless, if you are changing end to straight or straight to end the blower assembly has to turn 90 degrees and simultaneously rotate 180 degrees to achieve the proper orientation. Not all McQuay units will have the same air discharge location but will have the same general results when following the instructions.

1 . Turnoffpowertotheunitatthebreakerbox .

2 . Removethetoppanelbyremovingthescrewsaroundtheperimeterofthetopsecuringittothelowercabinet(Figure3) .

Note: Retain all screws for reinstalling.

Figure 3: Remove Top and Access Panel to Fan Motor

3 . Removetheaccesspaneltothefanmotorbyremovingthetwo(2)screwsatthebottomholdingthepanel(Figure3) .Removethepieceofinsulationatthebottomonthesideofthebottompanel .

4 . Iftheunitbeingconvertedisinstalledandhasbeenoperating,dischargethecapacitor .ReleasethewireclipshowninFigure4toprovideslackinthewires .Ifnecessaryremovethewiretietoprovideadditionalfreewirelength(Figure4) .

Figure 4: Discharge Capacitor and Release Wire Clip

5 . Removethescrewssecuringthefandischargepanelassembly(Figure3) .

DANGERHazardous Voltage!Disconnect all electric power including remote disconnects before servicing. Failure to disconnect power before servicing can cause severe personal injury or death.


CAUTION

Release wire clip to provide slack in wiring

Discharge Capacitor

Capacitor

Remove screws around the perimeter of top

Remove two (2) screws at bottom of access panel to fan motor

Remove Top

Remove Access Panel to Fan Assembly

Fan Discharge Panel Assembly (Bottom-Horizontal Orientation)

Unit Size 019-024 shown to illustrate

Page 6 of 36 / IM 1049

6 . Liftthefanassemblyoutrotatingit180degreesandpositionitwithintheopeningattheendoftheunit(Figure5) .Withthefanmotorintheenddischargepositionthefanandhousingorientationistop-horizontal .AStraightairdischargearrangementthehousingisinthebottom-horizontalorientation .

Figure 5: Lift Out the Fan Assembly Turn 90 degrees and Rotate 180°

7 . Securethefanassemblytotheunitframewiththescrewsremovedpreviously .

8 . Reinstalltheaccesspanelinthefanmotoraccessopening(Figure6) .

9 . Reinstallthetoppanelandsecurewithscrewsremovedpreviously .

Note: If installed correctly the fan motor should be accessible when the fan motor access panel is removed.

Figure 6: Reinstall the Top and Access Panel to Motor

Remove screws securing the fan assembly to the cabinet. Note bottom-horizontal orientation of fan assembly

Position the fan assembly in the end opening with the fan in the “top-horizontal” orientation

Rotate the Fan Assembly 180º

Reinstall Access Panel to Fan Motor

Reinstall Top

Completed End Discharge Assembly

Straight Discharge Arrangement(Bottom-Horizontal) Orientation

End Discharge Arrangement(Top-Horizontal) Orientation

IM 1049 / Page 7 of 36

Flexible Connector

Acoustic/Thermal Lining

Two 90° Turns(DuctworkSizedBasedonAirflow)

Diffuser

Diffuser

Acoustic/Thermal Lining3ft. (.9m) to 5ft. (1.5m)

Ductwork Supported Independent of Unit

Two 90° Turns Prior to the Intake(DuctworkSizedBasedonAirflow)

Flexible ConnectorAcoustic/Thermal Lining 10ft. (3 meters)

Ductwork Supported Independent of Unit


Figure 7: Suggested Supply Ducting per ASHRAE and SMACNA Publications

Figure 8: Suggested Return Ducting per ASHRAE and SMACNA Publications


Return Air Intake Located

Away from the Unit Blower

Flexible Connector

Ductwork & AttenuationDischargeductworkisnormallyusedwiththeseconditioners .Returnairductworkmayalsoberequired .

AllductworkshouldconformtoindustrystandardsofgoodpracticeasdescribedintheASHRAESystemsGuide .

Thedischargeductsystemwillnormallyconsistofaflexibleconnectorattheunit,atransitionpiecetothefullductsize,ashortrunofduct,anelbowwithoutvanes,andatrunkductteeingintoabranchductwithdischargediffusersasshowninFigure7 .Thetransitionpiecemustnothaveanglestotalingmorethan30°orseverelossofairperformancecanresult .

Donotconnectthefullductsizetotheunitwithoutusingatransitionpiecedowntothesizeofthedischargecollarontheunit .Withmetalductmaterial,thesidesonlyoftheelbowandentirebranchductshouldbeinternallylinedwithacousticfibrousinsulationforsoundattenuation.Glassfiberductboardmaterialismoreabsorbingandmaypermitomissionofthecanvasconnector .

Asageneralrecommendation,theacousticfibrousinsulationshouldbeatleast1/2inchthickovertheentireductrun(Figure8) .Forbettersoundattenuation,linethelastfivediametersofductbeforeeachregisterwithaone-inchthicksoundblanket .Elbows,teesanddamperscancreateturbulenceordistortionintheairflow.Placeastraightlengthofduct,5to10timestheductwidth,beforethenextfittingtosmoothoutairflow.Diffusersthatarelocatedinthebottomofatrunkductcanalsoproducenoise .Forthissamereason,volumecontroldampersshouldbelocatedseveralductwidthsupstreamfromanairoutlet .

ForHotel,Motel,DormitoryorNursingHomeapplicationsthatuseasingleductdischarge,avelocityof500to600fpmissuggested .Theseapplicationstypicallyhavestaticpressuresaslowas0 .05inchesofwaterandductlengthsapproximatelysixfeetinlength .Thedischargeductmustbefullylinedandhaveasquareelbowwithoutturningvanes .Returnairfortheseapplicationsshouldenterthrougha“low”sidewallfiltergrilleandrouteupthestudspacetoaceilingplenum .Forhorizontalheatpumpsmountedfromtheceiling,aninsulatedreturnplenumissometimesplacedatthereturnairopeningtofurtherattenuateline-of-sightsoundtransmissionthroughreturnopenings .

Page 8 of 36 / IM 1049

Returnairductworkcanbeconnectedtothestandardfilterrack.SeeFigure9(sidefilterremovalshown).Thefilterrackcanbeinstalledforbottomfilterremovalorsidefilterremovalbylocatingthebrackets.Forsidefilterremovalthebracketsshouldbelocatedonthebottom,leftside,andtop.Forbottomfilterremovalthebracketsshouldbemountedontheleftsidetopandrightsidewiththespringclipssupportingthefilter.

Donotusesheetmetalscrewsdirectlyintotheunitcabinetforconnectionofsupplyorreturnairductwork,especiallyreturnairductworkwhichcanhitthedrainpanortheaircoil .

Ventilation AirVentilationmayrequireoutsideair .Thetemperatureoftheventilationairmustbecontrolledsothatmixtureofoutsideairandreturnairenteringtheconditionerdoesnotexceedconditionerapplicationlimits .Itisalsotypicaltocloseofftheventilationairsystemduringunoccupiedperiods(nightsetback) .

Theventilationairsystemisgenerallyaseparatebuildingsubsystemwithdistributionductwork .Simpleintroductionoftheoutsideairintoeachreturnairplenumchamberreasonablyclosetotheconditionerairinletisrecommended .Donotductoutsideairdirectlytotheconditionerinlet.Providesufficientdistanceforthoroughmixingofoutsideandreturnair .SeeOperatingLimitsonpage12 .

Figure 9: Standard 1"(25mm) Filter rack/return air duct collar

Standard 1" (25mm)

Figure 10: Optional 2"(51mm) Filter rack/return air duct collar

Tool-less Filter Removal

IM 1049 / Page 9 of 36

Figure 11: CCH, CCW Sizes 007 thru 060 (Factory wired)

Figure 12: CCH, CCW Sizes 042 thru 060 (Factory wired, 460 volt motor only)

Piping1 . Allunitsshouldbeconnectedtosupplyandreturn

pipinginatwo-pipereversereturnconfiguration.Areversereturnsystemisinherentlyself-balancingandrequiresonlytrimbalancingwheremultiplequantitiesofunitswithdifferentflowandpressuredropcharacteristicsexistinthesameloop .Checkforproperwaterbalancebymeasuringdifferentialtemperaturereadingacrossthewaterconnections .Toinsureproperwaterflow,thedifferentialflowshouldbe10°Fto14°F(5°Cto8°C)forunitsincoolingmode .

Adirectreturnsystemmayalsoworkacceptably,butproperwaterflowbalancingismoredifficulttoachieveandmaintain .

2 . Thepipingcanbesteel,copperorPVC .3 . Supplyandreturnrunoutsusuallyjointheunitvia

shortlengthsofhighpressureflexiblehosewhicharesoundattenuatorsforbothunitoperatingnoiseandhydraulicpumpingnoise .Oneendofthehoseshouldhaveaswivelfittingtofacilitateremovalforservice .Hardpipingcanalsobebroughtdirectlytotheunit .Thisoptionisnotrecommendedsincenovibrationornoiseattenuationcanbeaccomplished .Thehardpipingmusthaveunionstofacilitateunitremoval .SeeFigure13fortypicalpipingsetup .

Electrical DataGeneral1 . Verifythecompatibilitybetweenthevoltageand

phaseoftheavailablepowerandthatshownontheunitserialplate .LineandlowvoltagewiringmustcomplywithlocalcodesortheNationalElectricalCode,whicheverapplies .

2. Applycorrectlinevoltagetotheunit.A7⁄8"(22mm)holeand/ora1-1⁄8"(29mm)knockoutissuppliedonthesideoftheunit .Adisconnectswitchneartheunitisrequiredbycode .Powertotheunitmustbesizedcorrectlyandhavedualelement(ClassRK5)fusesoranHACRcircuitbreakerforbranchcircuitovercurrentprotection .Seethenameplateforcorrectratings .

3 . Threephase50cycleunits,380/50-3,requireaneutralwirefor230/50-1powertothefancircuit .

4 . Connectthethermostat/subbasewiringwiththepower“off”totheunit .

5 . FieldsuppliedrelaysinstalledontheinputterminalsW1,W2,Y1,Y2orGmayintroduceelectricalnoise .Neverinstallrelaycoilsinserieswiththeinputs .

230 Volt OperationAll208-230voltsingle-phaseandthree-phaseunitsarefactorywiredfor208voltoperation .For230phaseoperation,thelinevoltagetaponthe24volttransformermustbechanged .Disconnectandcaptheredleadwireandinterchangeitwiththeorangeleadwireontheprimaryofthe24volttransformer .

Fan AssemblyAllfanmotorsaremulti-speedPSCoroptionalECM(sizes019-060)typewithintegralmountingbracketsandthermaloverloadprotection .Themotorisisolatedfromthefanhousingforminimumvibrationtransmission .PSCFanmotorshaveaterminalstriponthemotorbodyforsimplemotorspeedchangewithoutgoingbacktothecontrolbox .Tochangefanmotorspeedtohighonsize015through048,interchangetheredwirewiththeblackwire .Forlowspeed,sizes012,024,030,036,042and060,interchangetheblackwirewiththeredwire .Tochangethe460voltmotorfromhightolowspeed,interchangeBlackandRedwires,thenaddjumperbetweenBlackandBluewires .Allthefan/motorassemblieshavearemovableorificeringonthehousingtoaccommodatemotorandfanwheelremovalwithoutdisconnectingtheductwork .Thefanhousingprotrudesthroughthecabinetallowingadequatematerialforconnectionofflexibleduct.Eachmodelunitisshippedfromthefactoryformaximumperformanceandminimumsoundrequirements .Fansoundlevelsandperformancecanbeaffectedbyexternalstaticpressure .

Page 10 of 36 / IM 1049

BallValves

SupplyRiser

Return Riser

CondensateRiser

Supply Air

Hanger Kits (4)

Flex Hoses

Electrical Access Panel Optional Field Installed Vent

11⁄2"(38 mm)

11⁄2"(38 mm)

1⁄4" Per Foot(21 mm Per Meter)

4. Someflexiblehosethreadedfittingsaresuppliedwithsealantcompound.Ifnot,applyTeflontapetoassureatightseal .

Figure 13: (Sizes 007 through 060 shown)

Note: Do not overtorque fittings. The maximum torque without damage to fit-tings is 30 foot pounds. If a torque wrench is not available, use as a rule of thumb, finger-tight plus one quarter turn.

5 . Supplyandreturnshutoffvalvesarerequiredateachconditioner .Thereturnvalveisusedforbalancingandshouldhavea“memorystop”sothatitcanalwaysbeclosedoffbutcanonlybereopenedtotheproperpositionfortheflowrequired.

6 . Nounitshouldbeconnectedtothesupplyandreturnpipinguntilthewatersystemhasbeencleanedandflushedcompletely.Afterthecleaningandflushinghastakenplace,theinitialconnectionshouldhaveallvalveswideopeninpreparationforwatersystemflushing.

7 . Condensatepipingcanbesteel,copperorPVC .Eachunitincludesacondensateconnection .

8 . Thecondensatedisposalpipingmustbetrapped .Thepipingmustbepitchedawayfromtheunitnotlessthan1⁄4"perfoot.Theunithasa3/4inchfemalepipefittingoneachwatersourceheatpumptoaccommodatethecondensedrainconnection .Factorysuppliedcondensatehoseassemblieshaveapipethreadfittingtofacilitateconnectionofaflexiblevinylorsteelbraidedhose.AcompletecopperorPVCcondensesystemcanbeused.UnionfittingsinthecopperorPVClinesshouldbeappliedtofacilitateremoval .

Return Runout

Supply Runout

Mains

Flexible Hose

Runouts InitiallyConnected Together

Figure 14: Condensate disposal trapping detail

9 . Donotlocateanypointinthedrainsystemabovethedrainconnectionofanyunit .

10.Automaticflowcontrolleddevicesmustnotbeinstalledpriortosystemcleaningandflushing.

11 .Ahighpointofthepipingsystemmustbevented .12.Checklocalcodefortheneedfordielectricfittings.

Cleaning & Flushing System1. Priortofirstoperationofanyconditioner,thewater

circulatingsystemmustbecleanedandflushedofallconstructiondirtanddebris .

Iftheconditionersareequippedwithwatershutoffvalves,eitherelectricorpressureoperated,thesupplyandreturnrunoutsmustbeconnectedtogetherateachconditionerlocation .Thiswillpreventtheintroductionofdirtintotheunit .SeeFigure15 .

Figure 15: Supply & return runouts connected together

2 . Fillthesystematthecitywatermakeupconnectionwithallairventsopen.Afterfilling,closeallairvents .

IM 1049 / Page 11 of 36

Thecontractorshouldstartmaincirculatorwiththepressurereducingvalveopen .Checkventsinsequencetobleedoffanytrappedair,ensuringcirculationthroughallcomponentsofthesystem .

Powertotheheatrejectorunitshouldbeoff,andthesupplementaryheatcontrolsetat80°F(27°C) .

Whilecirculatingwater,thecontractorshouldcheckandrepairanyleaksinthepiping .Drainsatthelowestpoint(s)inthesystemshouldbeopenedforinitialflushandblowdown,makingsurecitywaterfillvalvesaresettomakeupwateratthesamerate .Checkthepressuregaugeatpumpsuctionandmanuallyadjustthemakeuptoholdthesamepositivesteadypressurebothbeforeandafteropeningthedrainvalves .Flushshouldcontinueforatleasttwohours,orlongerifrequired,toseeclear,cleandrainwater .

3 . Shutoffsupplementalheaterandcirculatorpumpandopenalldrainsandventstocompletelydraindownthesystem .Shortcircuitedsupplyandreturnrunoutsshouldnowbeconnectedtotheconditionersupplyandreturnconnections .Donotusesealersattheswivelflareconnectionsofhoses.

4 . Trisodiumphosphatewasformerlyrecommendedasacleaningagentduringflushing.However,manystatesandlocalitiesbantheintroductionofphosphatesintotheirsewagesystems .Thecurrentrecommendationistosimplyflushlongerwithwarm80°F(27°C)water .

5. Refillthesystemwithcleanwater.Testthewaterusinglitmuspaperforacidity,andtreatasrequiredtoleavethewaterslightlyalkaline(pH7 .5to8 .5) .Thespecifiedpercentageofantifreezemayalsobeaddedatthistime .UsecommercialgradeantifreezedesignedforHVACsystemsonly .Donotuseautomotivegradeantifreeze .

Oncethesystemhasbeenfilledwithcleanwaterandantifreeze(ifused),precautionsshouldbetakentoprotectthesystemfromdirtywaterconditions .Dirtywaterwillresultinsystemwidedegradationofperformanceandsolidsmayclogvalves,strainers,flowregulators,etc.Additionally,theheatexchangermaybecomecloggedwhichreducescompressorservicelifeorcausesprematurefailure .

6 . Settheloopwatercontrollerheataddsetpointto70°F(21°C)andtheheatrejectionsetpointto85°F(29°C) .Supplypowertoallmotorsandstartthecirculatingpumps.Afterfullflowhasbeenestablishedthroughallcomponentsincludingtheheatrejector(regardlessofseason)andairventedandlooptemperaturesstabilized,eachoftheconditionerswillbereadyforcheck,testandstart-up,airbalancing,andwaterbalancing .

Start-up1 . Openallvalvestofullopenpositionandturnon

powertotheconditioner .2 . Setthermostatfor“FanOnly”operationby

selecting“Off”atthesystemswitchand“On”atthefanswitch .If“Auto”fanoperationisselected,thefanwillcyclewiththecompressor .Checkforproperairdelivery .

3 . Forthoseunitsthathavetwo-speedmotors,reconnectforlowspeedoperationifnecessary .

4 . Setthermostatto“Cool .”Ifthethermostatisanautomaticchangeovertype,simplysetthecoolingtemperaturetothecoolestposition .Onmanualchangeovertypesadditionallyselect“Cool”atthesystemswitch .

Again,manyconditionershavetimedelayswhichprotectthecompressor(s)againstshortcycling .Afterafewminutesofoperation,checkthedischargegrillesforcoolairdelivery .Measurethetemperaturedifferencebetweenenteringandleavingwater .Itshouldbeapproximately1½timesgreaterthantheheatingmodetemperaturedifference .Forexample,ifthecoolingtemperaturedifferenceis15°F(8°C),theheatingtemperaturedifferenceshouldhavebeen10°F(5°C) .

Withoutautomaticflowcontrolvalves,targetacoolingtemperaturedifferenceof10°Fto14°F(5°Cto8°C) .Adjustthecombinationshutoff/balancingvalveinthereturnlinetoawaterflowratewhichwillresultinthe10˚Fto14°F(5°Cto8°C)difference .

5 . Setthermostatto“Heat .”Ifthethermostatistheautomaticchangeovertype,setsystemswitchtothe“Auto”positionanddepresstheheatsettingtothewarmestselection .Someconditionershavebuilt-intimedelayswhichpreventthecompressorfromimmediatelystarting .Withmostcontrolschemes,thefanwillstartimmediately .Afterafewminutesofcompressoroperation,checkforwarmairdeliveryatdischargegrille .Ifthisisa“coldbuilding”start-up,leaveunitrunninguntilreturnairtotheunitisatleast65°F(18°C) .

Measurethetemperaturedifferencebetweenenteringandleavingairandenteringandleavingwater .Withenteringwaterof60°Fto80°F(16°Cto27°C),leavingwatershouldbe6°Fto12°F(3 .3°Cto6 .6°C)cooler,andtheairtemperaturerisethroughthemachineshouldnotexceed35°F(19°C) .Iftheairtemperatureexceeds35°F(19°C),thenthewaterflowrateisinadequate.

Page 12 of 36 / IM 10�9

StandardRange GeothermalRange Units Units Cooling Heating Cooling HeatingMin.Entering...Water1,2 13ºC 13ºC -1ºC -6ºC NormalEnteringWater 29ºC 21ºC 25ºC �ºC MaxEnteringWater �3ºC 32ºC �3ºC 32ºC

StandardRange GeothermalRange Units Units Cooling Heating Cooling HeatingMin.EnteringWater1,2 55ºF 55ºF 30ºF 20ºFNormalEnteringWater 85ºF 70ºF 77ºF �0ºFMaxEnteringWater 110ºF 90ºF 110ºF 90ºF

StandardRange GeothermalRange Units Units Cooling Heating Cooling HeatingMin.AmbientAir 10ºC 10ºC 5ºC 5ºCNormalAmbientAir 27ºC 21ºC 27ºC 21ºCMaxAmbientAir 38ºC 29ºC 38ºC 29ºCMin.EnteringAir1,2 10ºC 10ºC 10ºC 5ºCNormalEnteringAirdb/wb 27/19ºC 21ºC 27/19ºC 21ºC MaxEnteringAirdb/wb1,2 38/28ºC 27ºC 38/28ºC 27ºC

StandardRange GeothermalRange Units Units Cooling Heating Cooling HeatingMin.AmbientAir 50ºF 50ºF �0ºF �0ºFNormalAmbientAir 80ºF 70ºF 80ºF 70ºFMaxAmbientAir 100ºF 85ºF 100ºF 85ºFMin.EnteringAir1,2 50ºF 50ºF 50ºF �0ºFNormalEnteringAirdb/wb 80/67ºF 70ºF 80/67ºF 70ºFMaxEnteringAirdb/wb1,2 100/83ºF 80ºF 100/83ºF 80ºF

At ARI flow rate. Maximum and minimum values may not be co bined. If one

value is at maximum or minimum, the other two conditions may not exceed the normal condition for standard units. Extended range units may combine any two maximum or minimum conditions, but not more than two, with all other conditions being normal conditions.

AdditionalInformationForInitialStart-upStandardRangeunitsCCHUnits are designed to start-up in an ambient of 50°F (10°C), with entering air at 50°F (10°C), with entering water at 70°F (21°C), with both air and water flow rates used in the ISO 13256-1 rating test, for initial start-up in winter.

Note: This is not a normal or continuous operating condition. It is assumed that such a start-up is for the purpose of bringing the building space up to occupancy temperature.

GeothermalRangeunitsCCWGeothermal heat pump units are designed to start-up in an ambient of 40°F (5°C), with entering air at 40°F (5°C), with entering water at 25°F (-4°C), with both air and water at flow rates used in the ISO 13256-1 rating test, for initial start-up in winter.

Note: This is not a normal or continuous operating condition. It is assumed that such a start-up is for the purpose of bringing the building space up to occupancy temperature.

6. Check the elevation and cleanliness of the condensate line. If the air is too dry for sufficient dehumidification, slowly pour enough water into the condensate pan to ensure proper drainage.

7. If the conditioner does not operate, check the following points:

a. Is supply voltage to the machine compatible? b. Is thermostat type appropriate? c. Is thermostat wiring correct?8. If the conditioner operates but stops after a brief

period: a. Is there proper airflow? Check for dirty filter,

incorrect fan rotation (3-phase fan motors only), or incorrect ductwork.

b. Is there proper water flow rate within temperature limits? Check water balancing; backflush unit if dirt-clogged.

9. Check for vibrating refrigerant piping, fan wheels, etc.

10. Do not lubricate the fan motor during the first year of operation as it is prelubricated at the factory.

11. Field supplied relays installed on the input terminals W1, W2, Y1, Y2 or G may introduce electrical noise. Never install relay coils in series with the inputs.

OperatingLimitsEnvironmentThis equipment is designed for indoor installation only. Sheltered locations such as attics, garages, etc., generally will not provide sufficient protection against extremes in temperature and/or humidity, and equipment performance, reliability, and service life may be adversely affected.

Table2:AirLimits-°F(Englishunits)

Table4:Water-°F(Englishunits)

Table3:AirLimits-°C(SIunits)

Table5:Water-°C(SIunits)

IM 10�9 / Page 13 of 36

Jumper Description Options JP1 Mode Open for normal operation mode Shorted for service/test operation mode JP2 Fan operation only applies to Open for continuous fan operation network controls Shorted for cycling fan operation JP3 Freeze protection Open for water freeze protection Shorted for antifreeze protection JP� Future spare Future spare JP5 Set point adjustment range only Open for adjustment range of -3.0° to +3.0° F applies to network controls with a Shorted for 50° to 90° F adjustment range room temperature sensor JP6 Room control type Open for thermostatic room control Shorted for room temperature sensor control, MicroTech III only JP7 Future spare Future spare JP8 Future spare Future spare

Table 6: MicroTech® III Unit Controller Terminals Locations and Descriptions

H1 - 1 2� 2� VAC Power Input

H1 - 2 C 2� VAC Common

H2 - 1 SL1 Fan Output - Switched L1

H2 - 2 Blank Terminal

H2 - 3 N Fan Neutral

H3 - 1 HP1-1 High Pressure Switch 1 Input Terminal 1

H3 -2 HP1-2 High Pressure Switch 1 Input Terminal 2

H� - 1 Discharge Air Temp Common

H� - 2 Discharge Air Temp Signal

H� - 3 Leaving Water Temp Common

H� - � Leaving Water Temp Signal

H5 - 1 1 I/O Exp Module Common (Gnd)

H5 - 2 I/O Exp Module Common (Gnd)

H5 - 3 I/O Exp Module +5 VDC

H5 - � I/O Exp Module SPI CE1

H5 - 5 I/O Exp Module SPI CLK

H5 - 6 I/O Exp Module SPI OUT

H5 - 7 I/O Exp Module SPI IN

H5 - 8 I/O Exp Module +12 VDC

H5 - 9 I/O Exp Module 2� VAC

H5 - 10 I/O Exp Module 2� VAC

H5 - 11 Spare

H5 - 12 Spare

H6-1 1 CondensateOverflowSignalInput

H6 - 2 Low Temp 1 Sensor Common

H6 - 3 Low Temp 1 Sensor Signal

H6 - � Low Pressure Switch 1 Source Voltage

H6 - 5 Low Pressure Switch 1 Signal

H6 - 6 Reversing Valve 1 Common

H6 - 7 Reversing Valve 1 Output

H7 - 1 1 Dummy Terminal

H7 - 2 Dummy Terminal

H7 - 3 Red LED Output

H7 - � Green LED Output

H7 - 5 Yellow LED Output

H7 - 6 Red-Green-Yellow LED Common

H8 - 1 1 Isolation Valve/Pump Request Relay N/O

H8 - 2 Isolation Valve/Pump Request Relay N/C

H8 - 3 2� VAC Common

H9 - 1 1 Return Air Temperature Signal

H9 - 2 Return Air Temperature Common

TB1 - 1 1 Room Sensor LED Output

TB1 - 2 2 Fan Mode / Heat-Cool-Auto Input

TB1 - 3 3 Setpoint Adjust Input

TB1 - � � Room Temperature Sensor / Tenant Override

TB1 - 5 5 DC Signal Common

Test-1 R 2� VAC

Test-2 W2 Heat Stage 2 Input

Test-3 W1 Heat Stage 1 Input

Test-� Y2 Cool Stage 2 Input

Test-5 Y1 Cool Stage 1 Input

Test-6 G Fan

TB2 - 1 R 2� VAC

TB2 - 2 A Alarm Output

TB2 - 3 W2 Heat Stage 2 Input

TB2 - � W1 Heat Stage 1 Input

TB2 - 5 Y2 Cool Stage 2 Input

TB2 - 6 Y1 Cool Stage 1 Input

TB2 - 7 G Fan Input

TB2 - 8 O Tenant Override Input

TB2 - 9 C 2� VAC Common

TB3 - 1 E Mark IV Emergency Shutdown Input

TB3 - 2 U Mark IV Unoccupied/Occupied Input

L1 - 1 L1 - 1 Line Voltage Terminal 1



N1 N1 Neutral Terminal 1



Table 7: Configuration Jumper Settings

Page 14 of 36 / IM 1049

Figure 16: MicroTech III Unit Controller Terminal Locations

Figure 17: Location of Configuration Jumpers on the MicroTech III Unit Controller

Note: A random start delay time between 180 and 240 seconds is generated at power up.

The IV/PR(H8) terminals of the MicroTech III unit controller are used for motorized valve / pump restart. This terminal passes a voltage signal whenever the unit compressor is turned on. This signal is detected by a pump restart relay providing a N.O. or N.C. set of contacts for heat pump loop circulation pump or motorized valve control. When used with a system control (by others), the relay operation accommodates turning off circulation pumps during unoccupied periods with a safety override dependent, at minimum, on WSHP’s need. The IV/PR(H8) terminals may be “daisy chained” between 200 units.

IM 1049 / Page 15 of 36

Mode / Fault Status LED’s Thermostat Alarm Light Yellow Green Red Output-Terminal “A” Occupied, Bypass, Standby, or Tenant Off On Off Energized Override Unoccupied On On Off Energized CondensateOverflow On Off Off De-engergized High Pressure 1 Fault Off Off Flash De-energized Low Pressure 1 Fault Off Off On De-energized Low Temperature 1 Fault Flash Off Off De-energized Brownout Off Flash Off De-energized Emergency Shutdown Off Flash Off De-energized Room/Return Air or Low

Flash Flash On De-engergized Temp Sensor 1 Failure

Service Test Mode On On Off De-energized

Enabled 1 Serial EEPROM On On On De-energized Corrupted Network“Offline” Off Off Off De-enegized Received

Remote Reset FeatureTheRemoteResetfeatureprovidesthemeanstoremotelyresetautomaticlockoutsgeneratedbyhigh-pressureand/orlow-temperature(inheating)faults .WhentheMicroTechIIIunitcontrollerisinautomaticlockoutduetooneofthesefaults,andthecauseofthefaultconditionhasbeenalleviated,energizingtheO-terminalfor10secondsormorewillforcetheMicroTechIIIunitcontrollertoclearthelockout .Aunitpowercyclecanalsobeusedtoclearanautomaticlockoutiftheconditionscausingthefaulthavebeenalleviated .

TheIntelligentresetfeaturehelpstominimizenuisancetripsofautomaticresetlockoutscausedbyhigh-pressureand/orlow-temperature(inheating)faults .Thisfeatureclearsfaultsthefirsttwotimestheyoccurwithina24-hourperiodandtriggersanautomaticlockoutonthe3rdfault .Theretrycountisresettozeroevery24hours .

TheMicroTechIIIunitcontrollerhasbuilt-innightsetbackoperation .A“grounded’signaltothe“U”terminalonTB3oftheunitcontrolputstheunitintotheunoccupiedmodefornightsetbackoperation .FanoperationterminatesandunitcontrolwillonlyrespondtosignalattheW2terminal .Daytimeheatingandcoolingoperationislockedout .+24VACtoW2energizesthecompressorandreversingvalveforheatingoperation .NightsetbackoperationcanbeoverriddenfortwohoursbyenergizingtheOontheTB2terminaloftheunitcontrolfor3seconds .Daythermostatsetpointsthencontroltheheatingandcoolingoperation .TheMicroTechIIIunitcontrolleralsoaccommodatesshutdownoperationonreceiptofa“grounded”signaltothe“E”input,respectively,onTB3inputterminaloftheunitcontrol .

Table 8: MicroTech III unit controller LED & fault outputs

1 Compressor relay/compressor terminal is labeled COMP, switched line of the same electric input as any of the L1 terminals.

MicroTech® III Unit ControllerTheMicroTechIIIUnitControllerincludesbuilt-infeaturessuchasrandomstart,compressortimedelay,shutdown,condensateoverflowprotection,defrostcycle,brownout,andLED/faultoutputs .Table8showstheLEDandfaultoutputsequences .

Theunithasbeendesignedforoperationwithamicroelectronicwallthermostatselectedbythemanufacturer .Donotoperatetheunitwithanyothertypeofwallthermostat .

Eachunithasaprintedcircuitboardcontrolsystem .ThelowvoltageoutputfromthelowvoltageterminalstripisACvoltagetothewallthermostat .RisA/Cvoltageoutputtothewallstat .

The24voltlowvoltageterminalstripissetupsoR-Genergizesthefan,R-Y1energizesthecompressorforcoolingoperation,R-W1energizesthecompressorandreversingvalveforheatingoperation .Thereversingvalveisenergizedintheheatingmode .Thecircuitboardhasafaninterlockcircuittoenergizethefanwheneverthecompressorisonifthethermostatlogicfailstodoso .

TheoutputtothewallstatisACcurrent .Terminal(R)onthewallstatcanbeconnectedtoterminal(R)onthePCboardforACvoltage . R=ACcurrent RtoG=fanonly RtoY1=cooling RtoW1=heatTheMicroTechIIIunitcontrollerhasalockoutcircuittostopcompressoroperationifanyoneofitssafetyswitchesopens(highpressureswitchandlowpressureswitchonunitsizes024through060) .Ifthelowtemperatureswitchopens,theunitwillgointothecoolingmodefor60secondstodefrostanyslushinthewater-to-refrigerantheatexchanger .After60secondsthecompressorislockedout .Ifthecondensatesensordetectsafilleddrainpan,thecompressoroperationwillbesuspendedonlyinthecoolingmode .Theunitisresetbyopeningandclosingthedisconnectswitchonthemainpowersupplytotheunitintheeventtheunitcompressoroperationhasbeensuspendedduetolowtemperature(freezestat)switch,highpressureswitch,orlowpressureswitchonunitsizes048thru060 .Theunitdoesnothavetoberesetonacondensateoverflowdetection .

TheMicroTechIIIunitcontrollerfaultoutputsendsasignaltoanLEDonawallthermostat .Table8showsforwhichfunctionsthefaultoutputis“on”(sendingasignaltotheLED) .

Page 16 of 36 / IM 10�9

Each unit controller orchestrates the following unit operations:

■ Enable heating and cooling to maintain setpoint based on a room sensor.

■ Enable fan and compressor operation.■ Monitor all equipment protection controls.■ Monitor discharge air temperature.■ Monitor leaving water temperature.■ Relay status of all vital unit functions.■ Support optional control outputs.

An amber, on-board status LED aids in diagnostics by indicating the water source heat pump operating mode and alarm conditions. If there are no current alarm con-ditions, the LED will indicate the unit operating mode. If there are one or more alarm conditions present, the LED will flash to indicate an alarm condition.

MicroTech III heat pumps with a MicroTech III unit controller are LonMark certified and designed to be linked with a centralized building automation system through a LonWorks communications network for centralized scheduling and management of multiple heat pumps. Wall-mounted room sensors are available to control the heating and cooling operation of each MicroTech III Water Source Heat Pump Unit Controller. Available room sensors include: room sensor with LED status and tenant override button, room sensor with LED status, timed-override button, room sensor with LED status, timed-override button, and setpoint adjust-ment, and room sensor with LED status, timed-override button, setpoint adjustment.

The MicroTech III water source heat pump unit con-troller provides control of McQuay water source heat pumps. The controller enables the mode of operation, monitors the water and air temperatures, and indicates fault conditions. Each unit controller is factory pro-grammed, wired, and tested for effective operation of your McQuay water source heat pump.The MicroTech III water source heat pump controller uses LonWorks technology. One of the following two versions of the application software is loaded into the controller at the factory.

LonMark® 3.4 certified application code is the current standard application code for MicroTech III units.

MicroTechIIIControllerWithLonWorks®CommunicationModuleThis manual covers the installation of a McQuay Horizontal Ceiling Hung Unit - Model CCH, CCW Water Source Heat Pump. For installation and operation information on LonWorks Communication Module and other ancillary control components, see:

• IM 927 - MicroTech III Water Source Heat Pump LonWorks Communication Module

• IM 933 - LonMaker Integration Plug-in Tool: For use with the MicroTech III Unit Controller

• IM 955 - MicroTech III Wall Sensor for use with Microtech III Unit Controller

Figure 18: LonWorks Communication Module

The LonWorks communication module will plug into the Microtech III unit controller at the CN_LON1 Header (see figure 20 on page 18).

Each McQuay water source heat pump can be equipped with a LonWorks Communication module. The control-ler is microprocessor-based and is designed to commu-nicate over a LonWorks communications network. The unit controller is factory programmed and tested with all the logic required to monitor and control the unit. The wall thermostat sets the unit mode of operation. The unit controller monitors water and air temperatures, and can communicate fault conditions to a LonWorks communications network.The MicroTech III unit controller with communication module includes a unit-mounted return air, discharge air and leaving water temperature sensor. Wall mounted temperature sensors include setpoint adjustment and tenant override. The user has the capability of substi-tuting the wall sensor with a duct-mounted return air sensor.

IM 1049 / Page 17 of 36

MicroTech III Controller with BACnet Communication ModuleForinstallationandoperationinformationonMicroTechIIIunitcontrollerandotherancillarycomponents,see:• IM928-MicroTechIIIBACnetCommunication

Module• OM931-MicroTechIIIUnitControllerforWater

SourceHeatPumpsOperationandMaintenanceManual

• IM955-MicroTechIIIWallSensorForusewithMicrotechIIIUnitController

McQuaywatersourceheatpumpsareavailablewithMcQuayBACnetMS/TPcommunicationmodulethatisdesignedtocommunicateoveraBACnetMS/TPcommunicationsnetworktoabuildingautomationsystem(BAS).Itcanbefactoryorfield-installed.

Theunitcontrollerisprogrammedandtestedwithallthelogicrequiredtomonitorandcontroltheunit .Anoptionalwallsensormaybeusedwiththecommunicationmoduletoprovidelimitedlocalcontrolofthewatersourceheatpump .Theunitcontrollermonitorswaterandairtemperaturesandpassesinformationtothecommunicationmodule .ThemodulecommunicateswiththeBAS,toprovidenetworkcontrolofthewatersourceheatpump .

ThemodulemakesoperationaldataandcommandsavailableonacommunicationsnetworkusingBACnetobjectsandproperties: Thenetworkcableisashieldedtwisted-paircable

Networkcommunicationsrunupto76 .8Kbps

DIPswitchesonthecontrollerenabletheMS/TPMACaddresstobesetintherange0-127

FourgreenstatusLEDsonthecommunicationmoduleindicatecommunicationactivityontheMS/TPcommunicationnetworkandwiththeunitcontroller

Figure 19: MicroTech III BACnet Water Source Heat Pump Snap-in Communication Module

MicroTechIIIUnitControllerwithBACnetMS/TP CommunicationModuleorchestratesthefollowingunitoperations:

Enableheatingandcoolingtomaintainsetpointbasedonaroomsensor

Enablefanandcompressoroperation Monitorsallequipmentprotectioncontrols Monitorsroomanddischargeairtemperatures Monitorsleavingwatertemperature Relaysstatusofallvitalunitfunctions

TheMicroTechIIIunitcontrollerwithcommunicationmoduleincludes:

Aunit-mountedreturnairsensor* Aunit-mounteddischargeairsensor* Aleavingwatertemperaturesensor*

* Dischargeairandreturnairsensorsmustbefield-installed per IM 956.

Thecommunicationmoduleprovidesaccesstosetpointsforoperationalcontrol

Availablewallsensorsinclude:

RoomsensorwithLEDstatusandtenantoverridebutton

RoomsensorwithLEDstatus,tenantoverridebut-ton,and±3°Fsetpointadjustment

RoomsensorwithLEDstatus,tenantoverride button,55°to90°Fsetpointadjustment

Page 18 of 36 / IM 1049

Figure 20: LonWorks® Communication Module Placement on MicroTech™ III Unit Controller

IM 10�9 / Page 19 of 36

CCH,CCWR410-A

UnitSizeVoltsandNumberofTerminalSlots Factory

208V 460V 575V FanSpeed

007 n/a n/a n/a n/a 009 n/a n/a n/a Low 012 n/a n/a n/a High 019 � – – Low 02� � � – High 030 � � – High 036 � 6 – High 0�2 � 6 6 High

0�8 � 6 6 Low 060 � 6 6 High

ChangingPSCFanMotorSpeedThe fan motor can be changed from high to low speed or vice versa by interchanging the wires on the black and red labeled terminals on the motor terminal block.

Table 9: Fan Motor Voltage and Terminal Slots

UnitSize009through012(115-60-1),(208/230-60-1)and(265-60-1)To change between high and low speed; interchange the red and black wires.

Figure 21: Sizes 009 through 012 (115/60-1, (208/230-60-1), (265-60-1)

UnitSize019through036(208/230-60-1)and(265-60-1)Fan motors on unit sizes 019-036, in both 208/230-60-1and 265-60-1 voltages (Figure 22) have a four-position terminal block. To change between high and low speed, interchange the red and black wires.

Figure 22: Sizes 019 through 036 (208/230-60-1), (265-60-1)

UnitSize030and036(460-60-1)Fan motors on unit sizes 030 and 036, 460-60-1 (Figure23) have a four-position terminal block. High and low speeds can be interchanged by switching the wires on the black and red terminals.

Figure 23: Sizes 030 through 036 (460-60-1)

UnitSize042through060Fan motors on unit sizes 042-060 (Figure 24 & 25) have a six-position terminal block. Motors for these sizes are factory wired for high speed. For low speed operation, move the black terminal (3) to the red terminal (6) and the black and blue terminals (3 & 4) receive a jumper.

Figure 24: Sizes 042-060 (460/60-1)

Figure 25: Sizes 042-060 (575/60-1)


CAUTION

WARNINGHazardous Voltage!The installer must determine and follow all applicable codes and regulations. This equipment presents hazards of electricity, rotating parts, sharp edges, heat and weight. Failure to read and follow these instructions can result in property damage, severe personal injury or death.

Page 20 of 36 / IM 1049

Unit Size 042 through 060 (265-60-1), (208/230-1) & (208/230-3)Fanmotorsonunitsizes042-060involtages265-60-1,208/230-1and208/230-3(Figure26)allhaveafive-positionterminalblock .Inordertochangebetweenhighandlowspeed,interchangethewiresontheblackandredterminals .

Figure 26: Sizes 042-070 (265-60-1), (208/230-1) (208/230-3)

Unit Size 024 through 036 (208/230-3)Fanmotorsonunitsizes024-036involtages208/230-3(Figure27)allhaveafour-positionterminalblock .Inordertochangebetweenhighandlowspeed,interchangethewiresontheblackandredterminals .

Figure 27: Sizes 024-036 (208/230-3)

Notes: All motors have a wiring label that is keyed for proper wiring operation. Check unit wiring diagram (on electrical access panel) for proper unit operation. Not all labels are the same.

Units leaving the factory are wired for high or low fan speed (see table 9 on page 19 for fan speed settings).

Label is located on the back of the terminal block.

(Optional) ECM MotorTheECMmotorwillmaintaintheratedairflowasstaticpressureincreasesordecreaseswithintheunit’soperatingrange .Contactthefactoryat315-253-2771or800-432-1342ifanalternateairflowsettingisrequired.

Start-up

1 . Openallvalvestofullopenpositionandturnonpowertotheunit .

2 . Setthethermostatfor"FanOnly"operationbyselecting"Off"atthesystemswitchand"On"atthefanswitch .If"Auto"fanoperationisselected,thefanwillcyclewiththecompressor .

3 . Forthoseunitsthathavetwo-speedmotors,reconnectforlowspeedoperationifnecessary .

4 . Setthermostatto“Cool .”Ifthethermostatisanautomaticchangeovertype,simplysetthecoolingtemperaturetothelowesttemperature .Onmanualchangeovertypes,additionallyselect“Cool”atthesystemswitch .

Again,manyunitshavetimedelayshelpprotectthecompressor(s)againstshortcycling .

Afterafewminutesofoperation,checkthedischargegrillesforcoolairdelivery .Measurethetemperaturedifferencebetweenenteringandleavingwater.Itshouldbeapproximately1-1⁄2timesgreaterthantheheatingmodetemperaturedifference .Forexample,ifthecoolingtemperaturedifferenceis15°F(8°C),theheatingtemperaturedifferenceshouldbe10°F(5°C) .

Withoutautomaticflowcontrolvalves,targetacoolingtemperaturedifferenceof10°Fto14°F(5°Cto8°C) .Adjustthecombinationshutoff/balancingvalveinthereturnlinetoawaterflowratewhichwillresultinthe10˚Fto14°F(5°Cto8°C)difference .

5 . Setthermostatto“Heat .”Ifthethermostatistheautomaticchangeovertype,setsystemswitchtothe“Auto”positionanddepresstheheatsettingtothehighesttemperature .Someunitshavebuilt-intimedelayswhichpreventthecompressorfromimmediatelystarting .Withmostcontrolschemes,thefanwillstartimmediately .Afterafewminutesofcompressoroperation,checkforwarmairdeliveryatdischargegrille .Ifthisisa“coldbuilding”start-up,leaveunitrunninguntilreturnairtotheunitisatleast65°F(18°C) .

Units must be checked for water leaks upon initial water system start-up. Water leaks may be a result of mishan-dling or damage during shipping. Failure by the installing contractor to check for leaks upon start-up of the water system could result in property damage.

CAUTION

IM 1049 / Page 21 of 36

Typical Wiring DiagramFigure 28: MicroTech III Unit Controller with PSC Motor – 208/230-60-1 Unit Sizes 019-060

Note: The gray tinted areas in the wiring diagram; Leaving Water (LWT), Discharge Air (DAT) and Return Air (RAT) Temperature sensorsareshippedorarefieldinstalledonunitsconfiguredwithacommunicationmodule.*Wiring diagrams are typical. For the latest drawing version refer to the wiring diagram located on the inside of the controls access panel of the unit.

Legend Item Description C1 Capacitor-Compressor C2 Capacitor-Fan CC Compressor - Contactor CM Compressor - MotorCOS CondensateOverflowSensor DAT Discharge Air Temp Sensor EWT Entering Water Temp Sensor HP High Pressure SwitchISO-NO Isolation Valve - Normally OpenLED1 LED Annunciator / HarnessLP Low Pressure SwitchSLTS Suction Line Temp SensorLWT Leaving Water Temp SensorMIII MicroTech III Main BoardR1 Relay - Fan MotorRAT Return Air Temp SensorRV Reversing Valve SolenoidTB1 Power Terminal BlockX1 Primary 24VAC Transformer_____ Standard Unit Wiring_ _ _ _ Optional Wiring (by others)

Table B 208V RED 230V ORG

Notes:1. Main board jumpers: JP3 Geothermal

Transformer: Unused wire to be capped.

Drawing No. 668991002

Page 22 of 36 / IM 1049

Typical Wiring DiagramFigure 29: MicroTech III Unit Controller with PSC Motor – 208/230/460/575-60-3 Unit Sizes 024-060


Note: The gray tinted areas in the wiring diagram; Leaving Water (LWT), Discharge Air (DAT) and Return Air (RAT) Temperature sensorsareshippedorarefieldinstalledonunitsconfiguredwithacommunicationmodule.*Wiring diagrams are typical. For the latest drawing version refer to the wiring diagram located on the inside of the controls access panel of the unit.

Legend Item Description C1 Capacitor-Compressor C2 Capacitor-Fan CC Compressor - Contactor CM Compressor - MotorCOS CondensateOverflowSensor DAT Discharge Air Temp Sensor EWT Entering Water Temp Sensor HP High Pressure Switch ISO-NO Isolation Valve - Normally OpenLED1 LED Annunciator / HarnessLP Low Pressure SwitchSLTS Suction Line Temp SensorLWT Leaving Water Temp SensorMIII MicroTech III Main BoardR1 Relay - Fan MotorRAT Return Air Temp SensorRV Reversing Valve SolenoidTB1 Power Terminal BlockX1 Primary 24VAC Transformer_____ Standard Unit Wiring_ _ _ _ Optional Wiring (by others)

Table B 208V RED 230V ORG 460V BLK/RED 575V BLUE



IM 1049 / Page 23 of 36

Typical Wiring DiagramFigure 30: MicroTech III Unit Controller with ECM Motor – 208/230-60-3 Unit Sizes 024-060


Legend Item Description CC Compressor - Contactor CM Compressor - MotorCOS CondensateOverflowSensor HP High Pressure SwitchISO-NC Isolation Valve - Normally Closed ISO-NO Isolation Valve - Normally OpenLED1 LED Annunciator / HarnessLP Low Pressure SwitchSLTS Suction Line Temp SensorLWT Leaving Water Temp SensorMIII MicroTech III Main BoardRAT Return Air Temp SensorRV Reversing Valve SolenoidX1 Transformer_____ Standard Unit Wiring_ _ _ _ Optional Wiring (by others)


Note: The gray tinted areas in the wiring diagram; Leaving Water (LWT) and Discharge Air (DAT) Temperature sensors are shippedorarefieldinstalledonunitsconfiguredwithacommunicationmodule.*Wiring diagrams are typical. For the latest drawing version refer to the wiring diagram located on the inside of the controls access panel of the unit.



Page 24 of 36 / IM 1049

Typical Wiring DiagramFigure 31: MicroTech III Unit Controller with ECM Motor – 208/230-60-1 Unit Sizes 019-060



Legend Item Description C1 Capacitor-Compressor CC Compressor - Contactor CM Compressor - MotorCOS CondensateOverflowSensor DAT Discharge Air Temp Sensor EWT Entering Water Temp Sensor HP High Pressure SwitchISO-NC Isolation Valve - Normally Closed ISO-NO Isolation Valve - Normally OpenLED1 LED Annunciator / HarnessLP Low Pressure SwitchSLTS Suction Line Temp SensorLWT Leaving Water Temp SensorMIII MicroTech III Main BoardR1 Relay - Fan MotorRAT Return Air Temp SensorRV Reversing Valve SolenoidX1 Transformer_____ Standard Unit Wiring_ _ _ _ Optional Wiring (by others)




IM 1049 / Page 25 of 36

Typical Wiring DiagramFigure 32: MicroTech III Unit Controller with ECM Motor and Optional Communication Module – 460-60-3 Unit Sizes 024-060


Legend Item Description CC Compressor - Contactor CM Compressor - MotorCOS CondensateOverflowSensor HP High Pressure SwitchISO-NC Isolation Valve - Normally Closed ISO-NO Isolation Valve - Normally OpenLED1 LED Annunciator / HarnessLP Low Pressure SwitchSLTS Suction Line Temp SensorLWT Leaving Water Temp SensorMIII MicroTech III Main BoardRAT Return Air Temp SensorRV Reversing Valve SolenoidX1 Transformer_____ Standard Unit Wiring_ _ _ _ Optional Wiring (by others)

Table B 460V/N BLK/RED




3-phase service with a neutral is required for ECM fan motor and 460 VAC operation.

Page 26 of 36 / IM 1049

Thermostat ConnectionsFigure 33: 7-Day Programmable Electronic Thermostat(P/N 668375301)

Notes: Includes Thermostat and Wall Plate.

Refer to the installation, operation & application guide (LIA265) for thermostat 668375301.

Figure 34: Non-Programmable Electronic Thermostat(P/N 668375401)

Note: Includes Thermostat and Wall Plate.

Refer to the installation, operation & application guide (LIA266) for thermostat 668375401.

*When remote reset of a lockout condition is required at the wall thermostat, it will be necessary to utilize a conductor between terminal "O" on the wall thermostat to terminal "O" on the MicroTech III unit controller (non-programmable stat only).

Optional Remote Sensor (P/N 66720401)1 . Removecoverfromremotesensorhousing .2 . Selectanappropriatelocationformountingthe

remotesensor .3 . Mountremotesensorunitusinghardwareprovided .

4 . Installtwostrandshieldedwirebetweenremotesensorandthermostat .Shieldedwiremustbeused .

Donotrunremotesensorwireinconduitwithotherwires .• Wire1shouldrunbetweentheS1terminalonthe

thermostatandtheS1terminalontheremotesensor• Wire2shouldrunbetweentheS2terminalonthe

thermostatandtheS2terminalontheremotesensor• ConnecttheshieldingofthewiretotheS2terminal

onthethermostat5 . Disablethemainsensor(R12)onthethermostatby

cuttingitfromthecircuitboard .

Figure 35: Optional Remote Sensor Wiring

MicroTech III Wall-Mounted Room Temperature Sensors (P/N 668900801, 669088201, 669088101)Figure 36: MicroTech III Wall-Mounted Room Temperature Sensors (669088201 Not Shown)

GeneralMicrotechIIIWall-MountedRoomTemperatureSensorsprovideelectronicsensingofroomtemperaturesatwalllocations .Allsensormodelsfeatureathermistor(10kΩ)andagreenLEDforunitstatus.Tenantoverride,setpointadjustmentpotentiometer,thermometer,andacommunicationsportareoptionalfeaturesavailableinanycombination

ThismanualprovidesgeneralinformationfortheMicrotechIIIWall-MountedRoomTemperatureSensors .ForinstallationinstructionsrefertoIM955

MicroTech III Unit Control Board Low Voltage Terminal Strip (Circuit 1)

W1

Y1

W2

Y2

G

Thermostat Terminals

-C

TB2

24VAC

Alarm Output

Heat 2

Heat 1

Cool 2

Cool 1

Fan

Tenant Override

24VAC Common C

O

G

Y1

Y2

W1

W2

A

R

+R

MicroTech III Unit Control Board Low Voltage Terminal Strip (Circuit 1)

W1

Y1

W2

Y2

G

Thermostat Terminals

-C

TB2

24VAC

Alarm Output

Heat 2

Heat 1

Cool 2

Cool 1

Fan

Tenant Override

24VAC Common C

O

G

Y1

Y2

W1

W2

A

R

+R

O

*Override (Optional)

S1 S2

S1 S2

Cut R12 fromcircuit board

Remote Sensor

Thermostat

Wire 1

Wire 2

Sensor 668900801 Sensor 669088101

IM 1049 / Page 27 of 36

Figure 39: Temperature Sensor Wiring to MicroTech III Unit Controller (669088101)

Additional Accessories – GeneralMotorized Isolation Valve & RelayThemotorizedvalvekitisavailableasafactory-installedandwiredoptionormaybeorderedasafield-installedaccessory .

WiredasshowninFigure40,themotorizedvalvewillopenonacallforcompressoroperation .Valvesforunitsizes007to019are1/2"whileunitsizes024to060are3/4" .

UsingaNormallyClosed(N/C),poweropenvalve,wireasillustratedinfigure40.

Figure 40: Normally Closed, Power Open Motorized Valve

Note: Connectors on valve must be cut off and stripped back and the wires twisted to make connections to the IV/PR Terminals

Figure 37: MicroTech III Wall Sensor Details .

SpecificationsThermistorresistance(10kΩ)(Conformstoadvancethermalproductscurve2)

AmbientTemperatureLimits:

ShippingandStorage:40°Fto160°F(–40°Cto71°C)

Operating:40°Fto140°F(4°Cto60°C)

Humidity:5to95%RH,non-condensing

Locations:NEMAType1,Indooronly

Connections:ColorCodedLeads

Wiring Sensors to the MicroTech III Unit ControllerFigure 38: Temperature Sensor Wiring to MicroTech III Unit Controller (668900801, 669088201)

Fan ControlSlide Switch

Mode ControlSlide Switch

Status LED(Green)

0 to 10 K ohmPotentiometer

Tenant OverrideMomentary Push Button Switch

4.59"

Temperature Sensor Terminals

MicroTech III Unit Controller TB1 Terminals

Actuator &Valve Assembly Anti-short Bushing

Connector Conduit

Pin(s), female connect to terminal H8

Connector

Anti-short Bushing

MicroTech III Unit Controller TB1 Terminals

Temperature Sensor Terminals

Page 28 of 36 / IM 1049

Figure 42: Wiring Multiple Unit Control Board (MUCP)

Notes:Dotted lines represent low voltage (Class II) wiring; a color-coded thermostat cable is recommended.

MUCP may be mounted horizontally or vertically on heat pump cabinet or any convenient surface.

Do not use if using night setback.

Thermostat must be A.C. voltage.

Pump Restart Relay Kit P/N 061419001

TheMicroTechIIIunitcontrollerhasaninternalPumpRestartRelayconnectedtoH8,Pin2fortheNormallyOpen(N/O)terminaloftheinternalrelay .

ConnecttoH8,Pin1fortheNormallyClosed(N/C)terminaloftheinternalrelay .

Theoutputoftheinternalpumprestartrelayis24-voltsACandtheoutputisnotavailablewhentheH8connectionisusedtocontrolamotorizedvalve .

Multiple Unit Control (up to 3 units) (P/N 056794201) Themultipleunitcontrolboardisanaccessoryusedwhenupto3-unitsarecontrolledfromasinglethermostat .Typicallythecontrolpanelandboardiscentrallymountedbetweentheunitsandthermostat .Amaximumof2boardsmaybeusedtogetherifupto6-unitsmustbeconnectedandcontrolledfromasinglethermostat .FordetailedinstallationinstructionsrefertoIM952 .ThisversionofthecontrolusesVACrelaysandshouldnotbeusedincombinationwithanyotheraccessoriesorequipmentthatrequireVDCconnections .

Figure 41: Multiple Unit Control Panel and Board

ThemultipleunitcontrolboardprovidesthecomponentsnecessarytoprotecttheMicroTechIIIunitcontrollerfromelectricaldamagethatmayoccurwhenusingstandardoff-the-shelfrelays .Donotusetheunoccupied(U-terminal)featurewiththemultipleunitcontrolboard .

Multiple Unit Control PanelCircuit Board

MicroTech III Unit Control Board Low Voltage Terminal Strip

CGY1Y2W1W2AR O

Thermostat TerminalsW1Y1W2Y2G -C+R

RY

GW

RY

GW

RY

GW

RY

GW

C

K3

K2

K1

TB3

TB4

TB2

TB1

CGY1Y2W1W2AR O

CGY1Y2W1W2AR O

TB2 - Unit #1

TB2 - Unit #2

TB2 - Unit #3

IM 1049 / Page 29 of 36

Troubleshooting The in and outs of R-410AR-410Aisanon-ozonedepletingblendoftworefrigerants-HFC-125andHFC-32inafiftypercentmixture .R-410AexhibitshigheroperatingpressureandrefrigerationcapacitythanR-22 .R-410AisintendedforuseinnewairconditioningapplicationsthathavetraditionallybeenusedHCFC-22(R-22) .DuetohighercapacityandpressureofR-410A,itmustnotbeusedinexistingR-22systems .

AlthoughR-410Aisnon-flammableatambienttemperatureandatmosphericpressure,itcanbecomecombustibleunderpressurewhenmixedwithair .

Note: R-410A should not be mixed with air under pressure for leak testing. Pressure mixtures of dry nitrogen and R-410A can be used for leak testing.

LubricationR-410Ashouldbeusedonlywithpolyester(POE)oil .TheHFCrefrigerantcomponentsinR-410Awillnotbecompatiblewithmineraloiloralkylbenzenelubricants .R-410AsystemswillbechargedwiththeOEMrecommendedlubricant,readyforusewithR-410A .

ChargingDuetothezeotropicnatureofR-410A,itshouldbechargedasaliquid .Insituationswherevaporisnormallychargedintoasystem,avalveshouldbeinstalledinthecharginglinetoflashtheliquidtovaporwhilecharging .

MakecertainthattherecycleorrecoveryequipmentusedisdesignedforR-410A .ThepressureofR-410Arefrigerantisapproximately60percentgreaterthanthatofR-22 .Pressuregaugesrequirearangeupto800PSIGhighsideand250PSIGlowside .Recoverycylindersrequirea400PSIGrating–donotputR-410Aina300PSIGratedcylinder .

Note: Because a water source heat pump operates under a wide range of water and air temperatures, the values printed below are to be taken as suggested pressure and temperatures.) All McQuay water source heat pumps are designed for commercial use. The units are designed for the cooling mode of operation and fail safe to cooling. The reversing valve is energized for the heating mode of operation.

Superheat Head Pressure Water Delta T8 to 14 degrees 335-355 PSIG 10° to 14°

All information above is based on ISO standard 13256-1 and tested at these conditions.

General Maintenance1 . Normalmaintenanceonallunitsisgenerally

limitedtofilterchanges.Unitsareprovidedwithpermanentlylubricatedmotorsandrequirenooilingeventhoughoilcapsmaybeprovided .

2 . Filterchangesarerequiredatregularintervals .Thetimeperiodbetweenchangeswilldependupontheprojectrequirements .Someapplicationssuchasmotelsproducealotoflintfromcarpetingandlinenchanges,andwillrequiremorefrequentfilterchanges.Checkfiltersat60-dayintervalsforthefirstyearuntilexperienceisacquired.Iflightcannotbeseenthroughthefilterwhenhelduptosunlightorabrightlight,itshouldbechanged .Amorecriticalstandardmaybedesirable .

3 . Thecondensatedrainpanshouldbecheckedannuallyandcleanedandflushedasrequired.

4 . Recordperformancemeasurementsofvolts,amps,andwatertemperaturedifferences(bothheatingandcooling) .Acomparisonofloggeddatawithstart-upandotherannualdataisusefulasanindicatorofgeneralequipmentcondition .

5 . Periodiclockoutsalmostalwaysarecausedbyairorwaterproblems .Thelockout(shutdown)oftheunitisanormalprotectiveresult .Checkfordirtinthewatersystem,waterflowrates,watertemperatures,airflowrates(maybeadirtyfilter),andairtemperatures .Ifthelockoutoccursinthemorningfollowingareturnfromnightsetback,enteringairbelowmachinelimitsmaybethecause .

Recycle/recovery equipment must be designated for R-410A. R-410A pressure is greater than R-22. Improper equipment can cause severe injury or death.

WARNING

Page 30 of 36 / IM 1049

Table 10: Troubleshooting Refrigeration Circuit

Charge Undercharge System Low Low Low High Low Low Low Low Pressure (Possible Leak)

Overcharge System High High High Normal High Normal High Pressure

Low Air Flow Heating High High High Low High Low High Pressure

Low Air Flow Cooling Low Low Low High High Low Low Temp

Low Water Flow Heating Low Low High Low High Low Temp

Low Water Flow Cooling High High High High Low Low High High Pressure

High Air Flow Heating Low Low Low Low High Low Low Low TempHigh Air Flow Cooling Low High Normal High Low Low Normal High Pressure

High Water Flow Heating Normal Low Normal High Normal Normal Low High PressureHigh Water Flow Cooling Low Low Low Low High Normal Low Low Temp

TXV Restricted High Low High High Low Low

LowNormal

NormalLow

HighNormal

LowNormal

LowNormal

Normal Low

Air Water Safety Head Suction Compressor Super Temp (loops) Temp LockSymptom Pressure Pressure Amp Draw Heat

Subcooling Differential Differential Out

IM 1049 / Page 31 of 36Page 31 / IM 742

Figure 43: Cooling Mode – (Single Circuit Only Shown)Return Air

Reversing Valve

Conditioned Air – (Cooling)

Thermal Expansion Valve

Co-Axial Heat Exchanger

Blower

Coil – Air to Refrigerant Heat Exchanger

Water In

Water Out

Sensing Bulb and Capillary Tube

Compressor

Figure 44: Heating Mode – (Single Circuit Only Shown)Return Air

Thermal Expansion Valve

Co-Axial Heat Exchanger

Reversing Valve

Conditioned Air – (Heating)

Blower

Water In

Water Out

Sensing Bulb and Capillary Tube

Compressor

Coil – Air to Refrigerant Heat Exchanger

Cooling Refrigeration CycleWhen the wall thermostat is calling for COOLING, the reversing valve directs the flow of the refrigerant, a hot gas, leaving the com-pressor to the water-to-refrigerant heat exchanger. Here the heat is removed by the water and the hot gas condenses to become a liquid. The liquid then flows through a thermal expansion metering system to the air-to-refrigerant heat exchanger coil. The liquid then evaporates becoming a gas, at the same time absorbing heat and cooling the air passing over the surfaces of the coil. The refrigerant then flows as a low pressure gas through the reversing valve and back to the suction side of the compressor to complete the cycle.

Heating Refrigeration CycleWhen the wall thermostat is calling for HEATING, the reversing valve directs the flow of the refrigerant, a hot gas, leaving the compressor to the air-to-refrigerant heat exchanger coil. Here the heat is removed by the air passing over the surfaces of the coil and the hot gas condenses to become a liquid. The liquid then flows through a capillary thermal expansion metering system to the water-to-refrigerant heat exchanger. The liquid then evaporates becoming a gas, at the same time absorbing heat and cooling the water. The refrigerant then flows as a low pressure gas through the reversing valve and back to the suction side of the compressor to complete the cycle.

Typical Refrigeration Cycles

Page 32 of 36 / IM 1049

Unit

Low voltage, check power supply voltage

Fuse may be blown, circuit breaker is open

Wire may be loose or broken. Replace or tighten wires

Unit control, check thermostat for correct wiring or faulty thermostat

Check wiring - loose or broken and check for faulty connection

Check relays and contacts, also capacitor and wiring

Check high pressure switch, low pressure switch and low temperature switch to see if unit is cycling on the safety

Check to see if the reversing valve is not hung up and is operating correctly

Check condensate overflow switch in cool mode of operation

Compressor attempts to start but does not

Check compressor wiring for defective wiring or loose connection

Check for faulty compressor capacitor

Insufficient cooling or heating

Check for lock rotor amp draw

Check for defective compressor internal windings with ohm meter

Check for proper air flow - filter could be dirty

Check for low refrigerant charge

Check amp draw on blower assembly

Fan operates, compressor does not

Compressor runs in short cycle

Neither fan, nor compressor runs and all LED lights are off

Check capacitor

Check wiring - loose or broken and check for bad connection

High or Low pressure lockout A. Cool mode, check water flowB. Heating mode, check air flowC. Check reversing valve for

proper valve position

Check compressor overload - make sure it is closed

Check compressor to ground, or for internal short to ground

Compressor winding may be open. Check continuity with ohm meter

Check thermostat for improper location

Check blower assembly fordirt or faulty fan motor capacity

Check thermostat forproper location

Check for proper water flowand delta T (°F)

Troubleshooting the Water Source Heat Pump Unit

Figure 45: Troubleshooting Guide - Unit Operation

IM 1049 / Page 33 of 36

Troubleshooting the MicroTech III Unit Controller

General Use and InformationTheMicrotechIIIunitcontrollerisprovidedwithtwodriveterminals,R(24VAC)andC(0VAC)thatcanbeusedbytheendusertodrivethethermostatinputs(G,Y1,Y2,W1,andW2)andcontrolinputs(U,E,andO) .Anycombinationofasingleboarddriveterminal(RorC)maybeusedtooperatetheMicroTechIIIunitcontroller’scontrolorthermostatinputs .However,onlyonedriveterminal(RorC)canbeconnectedtoanyindividualinputterminalordamagemayresult .Somecontrolinputsarenotaccessibletotheenduser(forexample,HP,LP,SLTS,andCOF) .

TypicallytheMicrotechIIIunitcontroller’sR(24VAC)terminalisusedtodrivetheboard’sthermostatinputsandcontrolinputsbyconnectingittotheRterminalofanindustrystandardthermostat .ThecontroloutputsofthestandardthermostatarethenconnectedtotheMicrotechIIIunitcontrollerthermostatinputsandcontrolinputsasneeded .Anyremainingboardinput(s)maybeoperatedbyadditionalthermostatoutputsorremoterelays(drycontactsonly) .

AllMicrotechIIIunitcontrollerinputsmustbeoperatedbydrycontactspoweredbythecontrolboard’spowerterminals .Nosolidstatedevices(Triacs)maybeusedtooperatetheMicrotechIIIunitcontrollerinputs .NooutsidepowersourcemaybeusedtooperatetheMicrotechIIIunitcontrollerinputs .

To avoid electrical shock, personal injury or death, be sure that field wiring complies with local and national fire, safety, and electrical codes, and voltage to the system is within the limits shown in the job-specific drawings and unit electrical data plate(s).

Power supply to unit must be disconnected when making field connections. To avoid electrical shock, per-sonal injury or death, be sure to rigorously adhere to field wiring procedures regarding proper lockout and tagout of components.

DANGER

Figure 46: MicroTech III Unit Controller LED Status and Faults Troubleshooting Reference

Flash Yellow LED

Read Outputs

Check Timers

Brownout

HighPressure

R - W 1

R -Y 1

Flash Green LED

Stop Compressor

No

Yes

No

No

No

No

No

No

No

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

LowPressure

Low SuctTemp Sensor

Low SuctTemp

Room TempSensor Failure

CondensateOverflow

Stop Compressor

Flash Red LED

Stop Compressor

Flash Yellow LEDFlash Green LED

Solid Red LED

Stop Compressor

Heating Mode

Run in Cooling Mode for 1 Min.

No

Yes

Cooling Mode

Turn on Yellow LED

Stop Compressor

ReversingValve On

Time Delay

StartCompressor

30 SecondTime Delay

Request forWater Flow

©2009 McQuay International • www.mcquay.com • 800.432.1342 IM 1049 Page 36 of 36

Warranty

All McQuay equipment is sold pursuant to its standard terms and conditions of sale, including Limited Product Warranty. Consult your local McQuay Representative for warranty details. Refer to Form 933-43285Y. To find your local McQuay Representative, go to www.mcquay.com.

This document contains the most current product information as of this printing. For the most up-to-date product information, please go to www.mcquay.com.

Products Manufactured in an ISO Certified Facility.

McQuay Training and Development

Now that you have made an investment in modern, efficient McQuay equipment, its care should be a high priority. For training information on all McQuay HVAC products, please visit us at www.mcquay.com and click on training, or call 540-248-9646 and ask for the Training Department.

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