ICM Controls ICM327HN Application/Install Guide

ICM Controls
Brand
ICM Controls
Model
ICM327HN
Type
Application/Install Guide

This manual is also suitable for

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
1
480 VAC
Line
2
Motor
2
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
HP
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
1
120 VAC
Line
2
Motor
2
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
1
480 VAC
Line
2
Motor
2
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
1
240 VAC
Line
2
Motor
2
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
HP
Temperature
Probe
RV
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 condenservs. 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
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ICM Controls ICM327HN Application/Install Guide

ICM Controls
Brand
ICM Controls
Model
ICM327HN
Type
Application/Install Guide
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