ICM Controls ICM325HNV User Manual

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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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 Specifications

General

Brand	ICM Controls
Model	ICM325HNV
Category	Controller
Language	English