Esco Ascent max - Page 44

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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.
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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
o
C.Toleranceof±1
o
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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