ICM Controls ICM325HNV General instructions

Installation, Operation & Application Guide
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ICM325HNV
High Voltage Head Pressure Control with
Optional Heat Pump Override
Temperature sensitive control regulates head pressure
Caution!
Installation of the ICM325HNV shall be performed by trained technicians only. Adhere to all local and national electric codes.
Disconnect all power to the system before making any connections.
•Line voltage:120-600VAC
•Control voltage:18-30VAC
•Frequency:50-60Hz
•Operating temperature:-40ºFto+176ºF(-40°Cto+75°C)
•Sensors:10Kohmsat77°F(25°C)
•Heat pump override:24VACN.C.orN.O.
 Note:A maximum of three sensors can be connected to the control.
•Weight:12ounces(341grams)
 Note:The ICM325HNV should be applied to motors and equipment that have been designated by their respective manufacturers as capable of being speed controlled.
• Mounting:
 –Surfacemountusing(4)#8screws
 –TheICM325HNVshouldbesurfacemountedtoacleanmetalorotherthermallyconductivesurfaceformaximumheatdissipation
 –ItisrecommendedthattheICM325HNVbemountedawayfromthecondenserexhaustairinordertomaintainloweroperatingtemperatures
Specifications
Wiring Diagrams
Connections for Heat Pump System at 480 VAC
1.Removepowerfromsystem.
2.FieldinstallawirefromLine 1wiretoLine 1terminal.
3.CutLine 2wire;afxthecommonfromthedefrost
board’sfanrelaytotheMotor 2terminalandtheLine
fromthecontactortotheLine 2terminal.
4.Make24VAC,probeandHPconnections.
5.Verifywiringiscorrect.
6.Powerupsystemandcheckoperation.
Line
1
480 VAC
Line
2
Motor
2
480 VAC
Field
Installed
Wire
PSC
Fan
Motor
Run
Capacitor
Fan
Relay
COM NC
Defrost Board
Connections for ICM325HNV at 120/208/240 VAC
1.Removepowerfromsystem.
2.FieldinstallawirefromLine 1wiretoLine 1terminal.
3.CutLine 2wire;afxmotorsidetoMotor 2terminal
andlinesidetoLine 2terminal.
4.Make24VACandtemperatureprobeconnections.
5.Verifywiringiscorrect.
6.Powerupsystemandcheckoperation. Typical
condenser fan
PSC
Fan
Motor
Run
Capacitor
120/208/240
VAC
PSC
Fan
Motor
Run
Capacitor
Field
Installed
Wire
Line
1
120/240
VAC
Line
2
Motor
2
120/208/240
VAC
Field
Installed
Wire
PSC
Fan
Motor
Run
Capacitor
Fan
Relay
COM NC
Defrost Board
120/208/240
VAC
Line
1
120/240
VAC
Line
2
Motor
2
Connections for Heat Pump System at 120/208/240 VAC
1.Removepowerfromsystem.
2.FieldinstallawirefromLine 1wiretoLine 1terminal.
3.CutLine 2wire;afxthecommonfromthedefrost
board’sfanrelaytotheMotor 2terminalandtheLine
fromthecontactortotheLine 2terminal.
4.Make24VAC,probeandHPconnections.
5.Verifywiringiscorrect.
6.Powerupsystemandcheckoperation.
Connections for Air Conditioning Only
1.For non-heat pump applications,
theheatpumpselectjumpermust
beintheDefault(N.O.)position,
andtheHPterminalsmustbeleft
unconnected.
2.SettheCutout Speedandthe
Hard Start Timetotheappropriate
positionsforthetypeofmotoryou
have(seeotherside).
TemperatureProbe24VAC
Additional
Probes
ProbeS1
HP
HeatPump
SelectJump-
erDefault
Position
Connecting the Probe
Example
1.Installthetemperatureprobeseveralbendsintothecondenser.Itcanbe
attachedtotheU-bendorplacedbetweenthensintheupper1/3ofthe
condenser(seeothersideformoreinformation).
 Note: Theresponseofthesystemcanbenetunedbyrepositioningthe
probe.Placetheprobeonthecondenserwhereitis100°Fwhen
pressuresarecorrectforbestresponse.
2. ConnectthetwowiresfromthesensortotheterminalblockwhereitismarkedPROBE S1.If
additionalprobesarenecessaryformultiplerefrigerantcircuits,theymaybeattachedtoterminals
markedPROBE S2andPROBE S3.
 Note: Thecontrolwillrespondtotheprobethatsensesthehighesttemperature.
Connections for ICM325HNV at 480 VAC
1.Removepowerfromsystem.
2.FieldinstallawirefromLine 1wiretoLine 1terminal.
3.CutLine 2wire;afxmotorsidetoMotor 2terminal
andlinesidetoLine 2terminal.
4.Make24VACandtemperatureprobeconnections.
5.Verifywiringiscorrect.
6.Powerupsystemandcheckoperation.
Line
1
480 VAC
Line
2
Motor
2
480 VAC
Field
Installed
Wire
PSC
Fan
Motor
Run
Capacitor
Typical
condenser fan
PSC
Fan
Motor
Run
Capacitor

1.TheHeat Pumpterminalsacceptthe24VACsignalfromthereversingvalveholdingcoil.MakeaparallelconnectionfromthereversingvalvetotheHPterminals.
 Note:Do not apply a voltage higher than 30 VAC to the HP terminals.
2.IftheHeat PumpisintheHeatingmodeandthereversingvalveisenergized,thentheHeat Pump Selectjumpermustbeinthe
Default(N.O.)position.
3.IftheHeat PumpisintheHeatingmodeandthereversingvalveisnotenergized,thentheHeat Pump Selectjumpermustbeinthe
N.C.position.
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www.icmcontrols.com
ONE-YEAR LIMITED WARRANTY
TheSellerwarrantsitsproductsagainstdefectsinmaterialorworkmanshipforaperiodofone(1)yearfromthe
dateofmanufacture.TheliabilityoftheSellerislimited,atitsoption,torepair,replaceorissueanon-casecreditfor
thepurchasepricesofthegoodswhichareprovidedtobedefective.Thewarrantyandremediessetforthherein
donotapplytoanygoodsorpartsthereofwhichhavebeensubjectedtomisuseincludinganyuseorapplication
inviolationoftheSeller’sinstructions,neglect,tampering,improperstorage,incorrectinstallationorservicingnot
performedbytheSeller.InordertopermittheSellertoproperlyadministerthewarranty,theBuyershall:1)Notify
theSellerpromptlyofanyclaim,submittingdatecodeinformationoranyotherpertinentdataasrequestedbythe
Seller.2)PermittheSellertoinspectandtesttheproductclaimedtobedefective.Itemsclaimedtobedefective
andaredeterminedbySellertobenon-defectivearesubjecttoa$30.00perhourinspectionfee.Thiswarranty
constitutestheSeller’ssoleliabilityhereunderandisinlieuofanyotherwarrantyexpressed,impliedorstatutory.
Unlessotherwisestatedinwriting,Sellermakesnowarrantythatthegoodsdepictedordescribedhereinaretfor
anyparticularpurpose.
LIAF004-1
DuringtheHard Startmode,fullvoltageisappliedtothemotorduringstartuptoovercomewindmillingandtolubricatethebearings.
Thepositionofthehardstartdialdeterminesthetimeperiodofthehardstartmode.Thedialcanbeadjustedbetween0.1secondandapproximately5seconds.
Setthehardstartdialaccordingtothetypeofmotoryouhave.Ifyouhaveaball bearing motor,setthehardstartdialtotheMINposition.Ifyouhaveasleeve bearing motor,setthe
hardstartdialtothemiddleofthesleevebearingrange.
Afteryoubeginattherecommendedsetting,youcannetunethehardstarttimewithintherecommendedrangeforthetypeofmotoryouhave.
Itisrecommendedthatyouusetheminimumpossiblehardstarttimetoavoidblowingtoomuchcoldairoverthecondenser.
Hard Startmodeisactivatedwhen24VACisapplied(ordisconnectedandre-applied)ortheprobetemperatureincreasestoabove70°F.Thehardstartmodeappliesfullvoltagetothe
motorforthesettimeperiod.Afterwards,themotorspeedisdictatedbythetemperaturesensor(s).
Setting the Hard Start Speed
Thecutoutspeeddialadjuststhemotorvoltagerange.Setthecutoutvoltagedialaccordingtothetypeofmotoryouhave.
Sleeve Bearing Motors:
Setthecutoutspeeddialtothemiddleofthesleevebearingrange.Inthisrange,themotorcanrundownapproximately40-50%ofthefulllinevoltage,whichallows
sufcientRPMsforcoolingandlubrication.
CAUTION!: Withsleevebearingmotors,itisimportantnottoadjustoutsidethesleevebearingrangeorbearingfailuremayresult.
Ball Bearing Motors:SetthecutoutspeeddialtotheMINpositionintheballbearingrange.Thispositionoffersthegreatestrangeofspeedcontrol.AttheMINsettingthe
motorcanrundowntoapproximately20-30%ofthefulllinevoltage.
Note:After starting at the recommended settings for either sleeve or ball bearing motors, you can ne tune the cutout speed to achieve the desired results.
Setting the Cutout Speed
Symptom Problem
Unitfailstostart Thesensormaynotbeconnectedoritisdefective.
Withtheprobedisconnected,useanohmmetertomeasuretheresistancebetweentheprobewires.ItshouldmatchthechartinAppendixB.IfyoureadanOPENor
SHORT,replacethesensor.
Fuseand/orcircuitblows Theunithasbeenmiswiredandmaybepermanentlydamaged.
ThefancyclesfromfullONtofullOFF
withlittleornomodulation
TurnOFFthecontrolcircuitpower(24VAC).Re-apply24VACpowerandconrmhardstartoperation.Reducethehardstartperiodtotheminimumsettingrequiredto
acceleratethefan.Excessivehardstartingcauseslargepressuredropsbyrunningtoomuchcoldairoverthecondenser.
Shouldthecyclingpersist,movetheprobeupseveralbendsintothecondensertoincreasethesensitivitytocondensingtemperature.
Adjustprobelocation.Finetunecutoutadjustment.
Thefandoesnotcomeonatall UsinganACvoltmeter,measurethevoltagebetweenthe24VACterminals.Itshouldreadapproximately24volts.
MeasurethelinevoltagebetweenLINE 1andLINE 2toconrmthatthelinevoltageispresent.
Removethethermistorprobefromtheterminalblockandmeasureitsresistanceatambienttemperature.Compareyourreadingattheappropriatetemperaturein
AppendixBtoseeiftheactualresistanceapproximatesthelistedvalue.Next,holdtheprobeinyourhandandconrmthattheresistancedecreases.
PlaceatemporaryjumperacrosstheS2orS3terminals.Fanshouldrunatfullspeed.Ifitdoes,recheckprobeconnectionandverifyprobeisoperatingcorrectly.
Thehighpressureswitchtripsoff Movetheprobefurtherintothecondenserwherethetemperatureishigher.ThiswillproduceahigherfanRPMandwilldecreasetheheadpressure.
Fineadjustthecutoutandhardstartsettings.
GreenandYellowLEDsalternate Verify24VACisavailableatthe24VACterminals.
Troubleshooting
Mounting a sensor into the condenservs. mounting it on the liquid line
Whenasensorismountedintothecondenser,thecontrolrespondsmorerapidlytochangesin
headpressurethanwhenitismountedontheliquidline.Thisisespeciallytrueforhighefciency
condensers.
Whenthesensorismountedontheliquidline,thecontrolrespondsmoreslowlyandtheresultscan
beafanthatcyclesonandoff.
Wheneverpossible,itispreferabletomountthesensorintheupper1/3ofthecondenserinsteadof
mountingitontheliquidline(seeillustrationbelow).Aspotonthecondenserthatis100°Fwhenthe
pressuresarecorrectisideal.
Appendix A
°C °F Resistance (K )
0° 32° 32.7
5° 41° 25.4
10° 50° 19.9
15° 59° 15.7
20° 68° 12.5
25° 77° 10.0
30° 86° 8.1
35° 95° 6.5
40° 104° 5.3
45° 113° 4.4
50° 122° 3.6
Temperature vs. Probe Resistance
Appendix B
ICM325HNV Typical Installation
N.O.
N.C.
Connections for Heat Pump Systems
Normal Function
Withprobetemperaturesabove100°F,thecontrolappliesfullvoltagetothemotor.Thegreenlightis
illuminated(fullspeedLED).
Withprobetemperaturesbetween70°Fand100°F,themotorspeedisproportionaltotheprobe
temperature.Theyellowlightisilluminated(variablespeedLED).
Whenthemotorstartsattemperaturesbetween70°Fand100°F,itwillhardstartforthelengthoftime
dictatedbythehardstartdialsetting.Afterthehardstarttimehaselapsed,themotorspeediscontrolled
bytheprobetemperature.
Asthetemperaturebeingsenseddecreases,theoutputvoltagedecreases.Theoutputvoltagemay
decreasetothedeterminedcutoutspeeddictatedbythecutoutspeeddial.Uponreachingthecutout
speedsetting,theoutputvoltagegoestozerovolts.
Systemrestartwilloccurwhenthetemperatureexceeds70°F.
Withprobetemperaturesbelow70°F,themotorremainsoff.Thegreenlightandtheyellowlightareoff.
Mode of Operations
Heat Pump Bypass Operation
Heatpumpbypassmoderunsthefanatfullspeedwhenthesystemisoperatinginheatmode.This
movesasmuchairaspossibleacrossthecondensercoil.
IftheheatpumpselectjumperisintheN.O.position,and24VACisappliedtotheHPterminals,the
motorwillbebroughttofullspeed.
IftheheatpumpselectjumperisintheN.C.position,and24VACisnotpresentattheHPterminals,the
motorwillbebroughttofullspeed.
Aseparaterelayisnotneeded.