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34 PB

OPERATION

Heat Control Operation - Electric Heat Only (KEQ08A11A)

WhenintheHeatmode,withandwithoutFanModeAuto(Fancycling):

IftheindoorambienttemperatureisbelowtheHeatDemandThreshold(HeatSetPointminus1.5˚F),turnon

electricheat.IfAmbientis0.3˚FabovetheHeatSetPointturnofftheelectricheat.

System Mode Auto

Thismodeprovidesautomaticchangeoverbetweencoolandheat.Theautomoderunsbasedontheroomambient

temperaturevs.theDemandThresholds.ItisonlyavailableinHeat-CoolUnit.

Notes:

Thereisabufferzonebetweenthecoolandheatsetpointswherenoheatingorcoolingisallowedtooccur.Itis

criticalthattheCoolDemandThresholdbegreaterthantheHeatDemandThresholdbyaminimumof3°while

intheAutoSystemMode.Forexample,ifauserentersavaluefortheAutoCoolingSetPointthatviolatesthe

minimum3°rule,theAutoHeatingSetPointwilladjustaccordingly.

Automatic Change Over Delay (Cool with Heat Units)

Thechangeoverdelayensuresthatanysystemheatingorcoolingovershootdoesnottriggeranoppositedemand

cycle.Thechangeoverdelay=15min.Thistimerblockstheoppositedemandcyclefromrunninguntilthetimer

expires.Asanexample,ifthelastdemandwasacoolcycle,andanothercoolcycleisrequested,thetimerwillnot

blocktherequest.However,ifthelastdemandcyclewasacoolcycle,andheatcycleisrequested,thetimerwill

blocktherequestuntilthechangeoverdelayisexpired.

Compressor Lock Out Time

Thelockoutfeatureensuresthatthecompressorisde-energizedforaperiodoftime.Thetimervariesrandomly

from180to240seconds

Thecompressorlockoutisinitiatedeverytimethecompressoris“off”dueto:

(1) Satisfying the temperature set point

(2) Changing mode to fan only or heat

(3) Turning the unit off

(4) Controlisrstpluggedinorpowerisrestoredafterfailure

(5) Linepowerisrestoredfromabrownoutcondition

Cooling Fan Delay

Fancycle/Automodeonly

WhenunitcyclescoolingON–startsthefan5secondsEARLY.WhenunitcyclescoolingOFF–DELAYSthefanoff

for30seconds.

Friedrich Kuhl+ KEQ08A11A User Manual

Questions and Answers: