ICM Controls ICM334 Application/Install Guide

Installation of the ICM334 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!

• Line Voltage:120-600VAC

• Maximum Load Current:10A

• Control Voltage:18-30VAC

• Frequency:50-60Hz

• Operating Temperature:-40ºFto+140ºF(-40°Cto+60°C)

• Probes:

– Temperature Sensors: P/NICM379

–Pressure transducer:P/NICM380

• Reversing Valve:24VACNominal

Speciﬁcations

• Heat Pump Override:24VACN.C.orN.O.

• Weight:12ounces(341grams)

• Mounting:

 – Surfacemountusing(2)#8screws

 – TheICM334shouldbesurfacemountedtoacleanmetalorotherthermallyconductive

surfaceformaximumheatdissipation

 – ItisrecommendedthattheICM334bemountedawayfromthecondenserexhaustair

inordertomaintainloweroperatingtemperatures

1.For non-heat pump applications,theheatpumpselectjumpermustbeintheDefault(N.O.)position,andtheREV. VALVE

terminalmustbeleftunconnected.

Connections for Air Conditioning Only

N.C.

REV. VALVE

P1&P2 BLK

HEAT

PUMP

N.O.

T AMBIENT

P1&P2 RED

P2 B.W.G.

P1 B.W.G.

T’STAT

24 VAC

COMMON

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

ICM334

Head Pressure Control with

Optional Heat Pump Override

Regulates head pressure

via pressure input

1.Uptotwotransducerscanbeused,inwhichcasethecontrolwill

respondtothetransducerthatsensesthehighestpressure.

2.Installthepressuresensoronthedischargelinetransducertting.

3.InstalltheambienttemperaturesensorattheT AMBIENTterminals

andallowittomeasureoutdoorairtemperature.

4.Whenusingthetemperatureprobeinsteadofatransducer,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.



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.

Installing and Connecting the Sensors

With Pressure Transducers

RED

BLACK

PRESSURE TRANSDUCER

RED

BLACK

PRESSURE TRANSDUCER

BLUE

WHITE

GREEN

BLUE

WHITE

GREEN

N.C.

REV. VALVE

P1&P2 BLK

HEAT

PUMP

N.O.

T AMBIENT

P1&P2 RED

P2 B.W.G.

P1 B.W.G.

AMBIENT

TEMP

SENSOR

With Temperature Sensors

N.C.

REV. VALVE

P1&P2 BLK

HEAT

PUMP

N.O.

T AMBIENT

P1&P2 RED

P2 B.W.G.

P1 B.W.G.

TEMP

SENSOR

AMBIENT

TEMP

SENSOR

TEMP

SENSOR

Connections

1.Removepowerfromsystem.

2.Connect3-phaseinputwirestoLine1,Line2,Line3terminals.

3.Connectmotor(load)wirestoLoad1,Load2,andLoad3terminals.

4.Make24VACconnection,probeandHPconnections.

5.Verifywiringiscorrect.

6.Powerupsystemandcheckoperations.

Motor

Fault Codes

Continuous On –Statusnormal

Continuous Off – Checkfor24VACpoweratY1orY2withrespecttoC

1 – Y1call,pressuretransducer1fault. Verify:sensorisconnectedtoP1,andthecorrecttransduceroutputusingappendixB.

2 – Y2call,pressuretransducer2fault. Verify:sensorisconnectedtoP2,andthecorrecttransduceroutputusingappendixB.

3 – Ambienttemperaturesensornotconnectedoropen.

Troubleshooting

Symptom Problem

Unitfailstostart UsinganACvoltmeter,measurethevoltagebetweenY1orY2andCterminals–itshouldread24volts.Measurethelinevoltage

betweenLINE1andLINE2toconrmthatlinevoltageispresent

Thefuseisblownand/orsignsofdamageontheunit Theunithasbeenmiswiredandmaybepermanentlydamaged.

FanONconstantly Iflightsareashingthennoprobeisconnectedorprobemalfunctionhasoccurred.SeeFaultCodesandmeasuretheappropriate

sensor.

CheckwiringofREV.VALVE/heatpumpjumper.

Measuringthethermistor-Disconnecttheambienttemperaturesensoranduseanohmmetertomeasuretheresistancebetween

thewires,itshouldmatchAppendixA.

Measuringthepressuretransducer-Withpowerappliedtothecontrol.UseavoltmetertomeasureDCvoltagebetweenP1&P2

BLKandP1B.W.G(orP2B.W.G),itshouldmatchAppendixB.

Thehighpressureswitchtripsoff SeeUnitfailstostartabove

Checkthesetpointandreduceitifneeded

1.The REV. VALVE terminal accepts the 24 VAC signal from the reversing valve holding coil.

MakeaparallelconnectionfromthereversingvalvetotheREV. VALVE terminal.

 Note:Do not apply a voltage higher than 30 VAC to the REV. VALVE terminal.

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.

Connections for Heat Pump Systems

N.O.

N.C.

REV. VALVE

P1&P2 BLK

HEAT

PUMP

N.O.

T AMBIENT

P1&P2 RED

B.W.G.

P1 B.W.G.

O/B

T’STAT

24 VAC

COMMON

7313 William Barry Blvd., North Syracuse, NY 13212

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

www.icmcontrols.com

LIAF208-1

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.

Mode of Operations

AfterproperlyinstallingtheICM334,thethreephasemotorswitchwillcontrolaconnectedmotor.Usingatemperaturesensorandtwopressuresensors,thedevicewillmonitortheambient

temperatureandpressureinsidethesystem.ThemonitorwillbeenergizedwhenthereisaYcall.

Whentheambienttemperatureisabove50°F(10°C),themotorwillbeenergizedcontinuously.Whentheambienttemperatureisbelow50°F,thepressuresensorisusedtodetermine

whetherthemotoristurnedonoroff.Whenthepressureis15psibelowthesetpressure,accordingtothehighestreadingofthetwopressuresensors,themotorwillbeturnedoff.Whenthe

pressureis15psiabovethesetpressure,accordingtothehighestreadingofthetwopressuresensors,themotorwillbeturnedon.

WhenthereisanewYcalltheloadwillenergizefor10seconds(hardstart).

Appendix A

Temperature vs. Probe Resistance

Appendix B

Pressure (psig) Voltage (Vdc)

0 0.5

50 0.9

100 1.3

150 1.7

200 2.1

250 2.5