Engineered air EngA W-TRAC User Manual

A W-TRAC
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IOM‐49 8of12 Mar99R4
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IftheoutsideairtemperatureiswarmerthantheexhaustairtheW‐TRACwillenter‘coolmode’and
rotatetheheatwheeltotransferheatfromtheoutsideairtotheexhaust.
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BASESETPOINT
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TheW‐TRACisdesignedtobeadischargeairtemperaturecontroller.Thebasedischargeairtemperature
issetfromthesetpointcontrolknoblocatedonthefaceoftheW‐TRAC.
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SETPOINTRESET
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Thebasedischargeairtemperatureisoftenmodifiedfromaremotesignaltomaintainthedesired
temperatureofthesuppliedspace.Thisiscalledreset.TheW‐TRACdischargetemperaturecanbereset
fromavarietyofsourcesusinga0‐10VDCsignal.
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AnoffsettotheBMSinputrangecanbeimplementedbyaddinga7.5kresistorinserieswithterminalS.
Thefollowingtabledescribesthechangeofdischargesetpointfromtheinputvoltage(toterminalsS+and
C1‐),withasetpointfixedat66°F.Refertotheequipmentfunctionpageforthedesignresetrange.
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 InputVoltage
 0.0 2.0 4.0 6.0 8.0 10.0
Discharge
Setpoint(°F/°C)
NoResistor 30/‐1 40/4 45/7 52/11 60/15 66/19
7.5kResistor 48/9 53/12 56/13 59/15 63/17 66/19
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FROSTCONTROL
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Frostshouldnotbeallowedtobuilduponthewheel.Itisnecessarytoreducetheamountofheat
recoveredwhentheoutsidetemperatureisbelowthefreezingpoint(0°C/32°F)andtheexhaustleaving
temperaturefallstoapointthatfrostcanbegintoform.Frostmaydamagethewheelandreduceairflow.
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Operatingtheheatwheelclosetothefrostthresholdtemperaturewillprovidemaximumenergyrecovery.
Thereare3differentmethodsofprovidingfrostcontrol,allofwhichreducetheheatwheelrotation
speed.
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EXHAUSTAIRRH%SENSOR
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ThismethodofcontrolrequiresahumiditysensorconnectedacrossterminalsEXHandC2.DIP1and3
mustbeOFF,DIP2mustbeON.Thesensorisinstalledintheexhaustairsection,justaftertheheat
wheel.
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Engineered air EngA W-TRAC Specifications

General

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