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• PressDOWNbuttonuntilyoufindbelowmessage:

‐ADCA/F:ShowactualADCvaluefromairflowvelocitysensor.

‐ADCZERO:ADCvaluefromairflowvelocitysensorwhenairvelocityiszero(set

duringzerocalibration)

‐ADCMIN:ADCvaluefromairflowvelocitysensoratairflowfailurepoint(set

during

sensorcalibration).

‐ADCMAX:ADCvaluefromairflowvelocitysensoratairflowmaximumpoint(set

duringsensorcalibration).

‐ADCTEMP:ADCvaluefromtemperaturesensor.

‐TEMP:thisisthecurrentambienttemperaturereadbytemperaturesensor(inºC)

‐CONSTANT:thisistheairflowsensorconstant

‐

CHMSNSR:ADCvaluefromchemicalsensor.

• In ordertopreventanyAIRFAILorunstablevelocitydisplayedonLCDproblem,

pleaseensurethefollowingsafterthecalibrationdone:

1. CONSTANTvalueiscorrect.Checkitwithconstantwrittenonsensorbodyor

insideReplaceableComponentRecordListwhichcome

withtestreport.

2. TEMPshowsroomtemperature.Ifnot,refertonextpossiblecause,partB.

3. ADCZERO<ADCMIN<ADCMAX.Ifnotpleasere‐docalibrationincorrect

sequence:SETCONSTANT→SETZERO→CALIB.IfCALIBRATIONERRORis

encountered,pleaserefertonextpossiblecause,partA.



4. Justaftercalibration,ADCA/FvalueshouldbesomewherebetweenADCMIN

andADCMAX.Ifnot,pleaseadjustthespeedcontrollerorredocalibrationas

necessary.

SensorFailure/

Sensor

Misalignment

A.AirFlowSensorfailure/misalignment

• Airflowsensorislocatedinsidetheunitandcanbeaccessedfromtheback.See

figure3‐2below.Itisastainlesssteeltubewith2roundholesfacingup.

Importanttocheck:

1. Ensurethatthesensorareaisnotblockedatallandthatitsthrough‐holes

are

perpendiculartothefilter’ssurface.

2. Exhaustsensorisattachedtightlytothemountingplate.

3. Thereisnogapbetweensensorboxandfiltersurface.

4. Sensorboxisinstalledtightlytothecabinet.

• Turnoffthecabinet.

• SeeComponentLayouttolocatethemainboard.

• UsingDVM,checkthesensor’soutputvoltage(DC)atchannelAIN1(+)andJ1(‐)on

mainboard(Seedrawing3‐3below).

• Thevoltageshouldincreaseifmotorvoltageisincreasedanddecreaseifmotor

voltageisdecreased.

• Ifyourobservationisdifferent,checksensorconnectiononthe

unit(seefigure3‐6

below)andatconnectorDpin9,10,11,12onelectricalbox(seeLayoutattheendof

thissection)foranybad/looseconnection.

• Ifconnectionisokaybutsensorisstillnotworkingproperly,replaceit.

• Ifairflowsensorisworkingproperly,proceedto

nextstep.

B.TemperatureSensorFailure



• Temperaturesensorislocatedclosetoairflowsensorinsidetheunit.Seefigure3‐2.

• UsingDVM,checkthetemperaturesensor’soutputvoltage(DC)atchannelAIN4(‐)

andJ4(+)onmainboard(Seefigure3‐3below).

• 0.01VDCshouldrepresentonedegreeCelsius.Forexample,if

outputis0.25VDC,it

indicatestemperatureof25

C.Toleranceof±1

Cisacceptable.

• Replacetemperaturesensorifthereadingiswrong.

• Iftemperaturesensorisworkingproperly,proceedtonextstep.

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