Conair MPW User's Guide download pdf (Page 32)

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isfullyloadedbytheheatfromtheprocess.IfthePartialLoadLEDstayson,thechillerhasa

verysmallloadonitfromtheprocess.Ifthislowloadconditionpersists,theToProcess

temperaturemaybegintodropbelowtheSetpointtemperature,eventuallycyclingoff

compressor(s).

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Compressor1LED

TheCompressor1LEDissolidgreenwhileCompressor#1isrunning.Itwillflashredifa

compressoroverloadconditionexists(onlychillerswiththefollowingnominaltonnages:15,25,

30,35,40).Compressor#1willbeenabledwheneverthetemperatureofwaterleavingthe

chillerrisesabovetheSetpoint

byanamountequaltothecontrolparameterPS1(Compressor

#1PositiveSpread).PS1isequalto2°Fbydefault.Thecompressorwillbedisabledifthe

temperatureofwaterleavingthechillerdropsbelowtheSetpointbyanamountequaltothe

controlparameternS1(Compressor#1NegativeSpread).TheparameternS1issetto4°Fby

default.SeetheProgramMenusectionforinstructionsonhowtoadjustPS1andnS1.To

preventexcessivecompressorcycling,thecontrolboardhasacompressoranti‐cycledelay

timerbuiltin.Anytimethatacompressorisbeingpreventedfromturningonbytheanti‐cycle

timer,theCompressorRecycleLEDwillbelit.

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Compressor2LED

TheCompressor2LEDissolidgreenwhileCompressor#2isrunning.Compressor#2isonly

presentonchillers20tonsandlarger.Itwillflashredifacompressoroverloadconditionexists

(onlychillerswiththefollowingnominaltonnages: 15,25,30,35,and40).Compressor#2will

beenabledwheneverthetemperatureofwaterleavingthechillerrisesabovetheSetpointby

anamountequaltothecontrolparameterPS2(Compressor#2PositiveSpread).PS2isequalto

3°Fbydefault.Thecompressorwillbedisabledifthetemperatureofwaterleavingthechiller

dropsbelowtheSetpoint

byanamountequaltothecontrolparameternS2(Compressor#2

NegativeSpread).TheparameternS2issetto5°Fbydefault.SeetheProgramMenusection

forinstructionsonhowtoadjustPS2andnS2.Topreventexcessivecompressorcycling,the

controlboardhasacompressoranti‐cycledelaytimerbuiltin.Anytimethatacompressoris

beingpreventedfromturningonbytheanti‐cycletimer,theCompressorRecycleLEDwillbelit.

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TemperatureLimitLED

TheTemperatureLimitLEDwillflashyellowifadeviationwarningexists.Itwillflashredifa

highorlowcriticaltemperaturesafetyalarmconditionexists.

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Conair MPW User's Guide Page 32