ICM Controls ICM326HN Application/Install Guide

Brand: ICM Controls

Model: ICM326HN

Type: Application/Install Guide

This manual is also suitable for

ICM327HN

ICM326HN / ICM327HN

Line Voltage Head Pressure Control

With built-in transformer Optional heat pump override

ICM326HN ICM327HN

• Line voltage:120,208/240,and480VAC

• Frequency:50-60Hz

• Output:10ampmaximum,100mAminimum

• Operating temperature:-40ºFto+176ºF(-40°Cto+75°C)

• Sensors:10Kohmsat25°C

• Heat pump override:N.C.orN.O.

 Note:

Amaximumofthreesensorscanbeconnectedtothecontrol

• Weight:12ounces(341grams)

 Note:

TheICM326HNandICM327HN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ICM326HNandICM327HNshouldbesurfacemountedtoacleanmetalorotherthermally-conductive

surfaceformaximumheatdissipation

 – ItisrecommendedthattheICM326HNandICM327HNbemountedawayfromthecondenserexhaustairto

maintainloweroperatingtemperatures

ELECTRICAL SHOCK HAZARD –

InstallationoftheICM326HNandICM327HNshallbeperformedby

trainedtechniciansonly.Adheretoalllocalandnationalelectriccodes.Disconnectallpowertothesystem

beforemakingconnections.

Speciﬁcations

Installation of the ICM326HN and ICM327HN 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.

Caution!

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 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 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.

HeatPump

SelectJumper

DefaultPosition

ProbeS1

ProbeS2

ProbeS3

Temperature

Probe

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VAC

PSC

Fan

Motor

Run

Capacitor

Field

Installed

Wire

Line

120 VAC

Line

Motor

120 VAC

Connections for ICM327HN 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

Field

Installed

Wire

PSC

Fan

Motor

Run

Capacitor

Fan

Relay

COM NC

Defrost Board

208/240

VAC

Line

240 VAC

Line

Motor

Connections for Heat Pump System at 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 Heat Pump Systems

 Note:

HPterminalswillnotrecognize24VAC.Linevoltagemustbeapplied(120,208/240,or480VAC).

1. Theheatpumpterminalsacceptthelinevoltagesignalfromthereversingvalveholdingcoil.Makeaparallel

connectionfromthereversingvalveto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.

N.O.

N.C.

ConnectParallelto

ReversingValve

HeatPump

SelectJumper

DefaultPosition

ProbeS1

ProbeS2

ProbeS3

Temperature

Probe

Connections for ICM326HN at 120 VAC

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.

LIAF045-1

TheCutout Speeddialadjuststhemotorvoltagerangethatdetermines

theRPMlevelofthecondenserfan.SettheCutout Speed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tunethecutout

speedtoachievethedesiredresults.

Setting the Cutout Speed

Setting the Hard Start Time

DuringtheHard Startmode,fullvoltageisappliedtothemotorduringstartupto

overcomewindmilling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linevoltageisapplied(ordisconnectedandreapplied).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).

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mis-wiredandmaybepermanentlydamaged.

Thefancyclesfromfull

ONtofullOFFwithlittle

ornomodulation

FirstturnOFFthepower.Reapply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movingtoomuchcoldair

overthecondenser.

Checkpositionofheatpumpselectjumper.

Shouldthecyclingpersist,movetheprobeupseveralbendsintothecondenserto

increasethesensitivitytocondensingtemperature.

Finetunecutoutadjustment.

Thefandoesnotcome

onatall

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fartherintothecondenserwherethetemperatureishigher.Thiswill

produceahigherfanRPManddecreasetheheadpressure.

Fineadjustthecutoutandhardstartsettings.

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resultcanbeafanthat

cyclesonandoff.

Therefore,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.Aspotonthecondenserthatis100°Fwhenthepressuresarecorrectisideal.

Appendix A

°C °F RESISTANCE (KΩ)

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

ICM326HN Typical Installation

Condenser

Sensor

Fan

Motor2

Motor1

Control

Circuitry  Thisterminal

tobeused

for240VAC

ICM326HNcanmonitortwoadditionalcondensers

Reversing

Valvefor

HeatPump

Line1

Line2 Line2

ICM327HN Typical Installation

Condenser

Sensor

Fan

Motor2

Motor1

Control

Circuitry

ICM327HNcanmonitortwoadditionalcondensers

Reversing

Valvefor

HeatPump

Line1

Line2 Line2

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settingoftheHard Startdial.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.UponreachingtheCutout Speeddialsetting,theoutputvoltagewillgotozerovolts.

Systemrestartoccurs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.

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acrossthecondensercoilaspossible.

IftheHeat Pump SelectjumperisintheN.O.positionandlinevoltageis present attheHPterminals,themotor

willbebroughttofullspeed.

IftheHeat Pump SelectjumperisintheN.C.positionandlinevoltageis not present attheHPterminals,the

motorwillbebroughttofullspeed.

Aseparaterelayisnotneeded.

Mode of Operation

ICM Controls ICM326HN Application/Install Guide

Brand: ICM Controls

Model: ICM326HN

Type: Application/Install Guide

This manual is also suitable for

ICM327HN

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ICM Controls ICM326HN Application/Install Guide

This manual is also suitable for

ICM Controls ICM326HN Application/Install Guide

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