ICM Controls ICM325HNV Installation guide

Brand: ICM Controls

Model: ICM325HNV

Type: Installation guide

Installation, Operation & Application Guide

For more information on our complete range of American-made

products – plus wiring diagrams, troubleshooting tips and more,

visit us at www.icmcontrols.com

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

480 VAC

Line

Motor

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

120/240

VAC

Line

Motor

120/208/240

VAC

Field

Installed

Wire

PSC

Fan

Motor

Run

Capacitor

Fan

Relay

COM NC

Defrost Board

120/208/240

VAC

Line

120/240

VAC

Line

Motor

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

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

480 VAC

Line

Motor

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.

7313 William Barry Blvd., North Syracuse, NY 13212

(Toll Free) 800-365-5525 (Phone) 315-233-5266 (Fax) 315-233-5276

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.

ICM Controls ICM325HNV Installation guide

ICM Controls ICM325HNV Installation guide

ICM Controls ICM325HNV Installation guide

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