Engineered air EngA W-TRAC User Manual

A W-TRAC
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IOM‐49 7of12 Mar99R4
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INDICATIONANDDIAGNOSTICLIGHTS
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OnthefaceoftheW‐TRACare5redLEDindicationlights.
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Light Description
LowExhaust
Temp
Indicatestheexhausttemperatureisbelowthecalculatedminimumallowable
temperature,whichisbasedontheamountofmoistureinthereturnair(measured
orestimated)andtheambienttemperature.
BadSensor Shortedoropensensorindication.
VentMode Wheelwillbestopped.Nocallforheatingorcooling.
DischargeTooHot Wheelisslowingdownduetoexcessiverecoveryofheat.
FrostMode Heatwheelrotationspeedisreducingtopreventfrostaccumulation.
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ADJUSTMENTPOTS
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Thereareanumberofsettingandcalibrationpotentiometers(POT’s)locatedonthefaceoftheW‐TRAC.
Modificationstotheseshouldonlybedonebyexperiencedandqualifiedpersonnel.
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POT Description
DISCAL Dischargetemperaturesensorcalibration.
EXCAL Exhausttemperaturesensorcalibration.
AMBCAL Ambient/outdoortemperaturesensorcalibration.
BDRH PredicteddesignreturnairRH%scale(1‐4).
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TEMPERATURECONTROL
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TheW‐TRAChas4modesofoperation;Heat,Defrost,VentandCool,thatcontrolsthewheelrotational
speedtoachievethedesiredtemperaturesetpointofsupplyairleavingthewheel.
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Whentheoutsideairiscolderthantheexhaustair,theheatwheelwillrotatetocaptureheatfromthe
exhaustairsideandtransferittothesupplyairstream.Increasingtherotationspeedwillincreasethe
amountofheattransferred.
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Iftoomuchheatisbeingremovedfromtheexhaustairstreamitispossibleforfrosttoaccumulateonthe
faceoftheheatwheel.TheW‐TRACwillautomaticallyreducetherotationspeedtopreventfrosting.
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Ifnoheatingisrequired,theW‐TRACwillstopthewheelrotationandenter‘ventmode’.
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Engineered air EngA W-TRAC Specifications

General

Brand	Engineered air
Model	EngA W-TRAC
Category	Controller
Language	English