Esco Ascent max - Airflow Failure

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33
DuctlessFumeHoods
Problem3:AirflowFailure(AIRFAIL)–alarmistriggered
Cause  CorrectiveAction
Externalair
interference
• Ensurethattherearenoexternalsourcesofairflowdisturbancelikeairconditioner
vent,windoworincidencesofdooropeningorpeoplewalkingfastnearthecabinet.
• Locateairflowsensorinstalledinsidetheworkzone.Ensurethereisnoair
disturbanceorobstructionaroundthesensor.
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• Ifthereisnoexternalairinterference,proceedtonextstep.
Blockedcabinet
grille
• Ensurethattheairgrillesinsidethecabinetarenotblockedandthatthecabinetis
notexcessivelyloaded.
• Ifthereisnoblockageinairgrilles,proceedtonextstep.
Lowbuilding
supplyvoltage(if
newcabinet,check
thisfirst)
• Turnonthecabinet.
• OpenelectricalboxandfindmotorvoltagesamplingportasshownonFigure3‐1.
• Fornewcabinet,ifthemotorvoltageislowerthantheNominalVoltagevalue
recordedinfactorytestreport,
adjustthespeedcontrollertogetoutputvoltageto
blowerasspecifiedintheTestReport–TestConditionsDocumentationSheet.
• Forcabinetthathasbeenusedformorethan1year,refertolastmotorNominal
Voltagefromlastcertificationreportorifnotavailable,measuretheactual
airflow
oncabinetandincreasemotorvoltageaccordinglytoachievenominalairflow
velocity.
• IfsupplyvoltageissameasNominalVoltage,proceedtonextstep.
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Filterloadedor
wrongspeed
controllersetting
• PluginthevoltmetertotheMotorVoltageSamplingPort.
• Measuretheactualairflowvelocityusinganemometerorflowhood.Ifactual
airflowisokaybutLCDstillshowsAIRFAIL,proceedtonextstep.Ifactualairflowis
notokay,pleaseadjust
motorspeedcontrolleraccordinglyuntilalarmisturnedoff
andtheLCDshowsnominalairflowreading.Afterthis,ifLCDstillshowsAIRFAIL,
proceedtonextstep.
• Thesensorwilltakeabout2‐3minutesbeforeitcanregisteranewairflowsetting.
Note:Thecabinetmustbecertifiedatleastannually.
• Iftheblowerisalreadyoperatingatmaximumvoltageandtheairflowalarmisstill
triggeredduetofilterloaded,it’stimetochangethefilter.
• Iffilterisnotloaded,proceedtonextstep.
Faulty/inaccurate
calibration
• Re‐calibratethemicroprocessor.Followthecalibrationprocedureinthetestreport.
Warning:Tobecarriedoutonlybyanauthorizedperson.
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CHECKINGCALIBRATIONDATA
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• Aftercalibrationisdone,gotoMENU,keyinPINifrequired,chooseSETMODE,and
chooseMAINTENANCE.
• LCDwillblinkinMAINTENANCEMODE.
• GotomaindisplaybypressingMENUbuttontwice.
• PressSETbutton,LCDwilldisplaysoftwareversionthatiscurrentlybeingused
on
thecabinet.Example:C201V3.0
Figure3‐1