ICM Controls ICM325HN User Manual

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.
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.
Connections for Heat Pump Systems
N.O.
N.C.
Temperature
Probe
24VAC ConnectParallelto
24VACReversingValve
Additional
Probes
ProbeS1
HP
HeatPump
SelectJumper
DefaultPosition
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.
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.
Mode of Operation
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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).
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(seebelow).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(seePage
9)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
UsinganACvoltagemeter,measurethevoltagebetweenthe24VACterminals.
AlsoverifyyouhavethevoltagebetweenLine 1andLINE2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100Fwhenthepressuresarecorrect
isideal.
Temperature vs. Probe Resistance
°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
Appendix A Appendix B
Setting the Cutout Speed
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.
LIAF042
PatentNo.424,953
7313WilliamBarryBlvd.,NorthSyracuse,NY13212
(Toll Free)800-365-5525(Phone)315-233-5266(Fax)315-233-5276
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ICM Controls ICM325HN Specifications

General

Brand	ICM Controls
Model	ICM325HN
Category	Control Unit
Language	English