ICM Controls ICM326HN User Manual

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
Condenser
Condenser
Sensor
Sensor
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
Condenser
Condenser
Sensor
Sensor
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 Specifications

General

Brand	ICM Controls
Model	ICM326HN
Category	Controller
Language	English