Friedrich Kuhl+ KEQ08A11A User Manual

54 PB
COMPONENTS TESTING
WARNING
ELECTRIC SHOCK HAZARD
Turn off electric power before service or
installation. Extreme care must be used, if it
becomes necessary to work on equipment with
power applied.
Failure to do so could result in serious injury or
death.
Testing the User Interface and Electronic Control Board
IftheUserInterfacedoesnotturnon:
 1.Makesuretheunithasthepropervoltageandthatitisturnedon.CheckpoweratTerminalsL1andL2.
 (refertoElectronicControlBoardIdentication,Fig707
 2.DisconnecttheUserInterface’swireharnessonthecontrolboard.
 3.Usingavoltmeter,checktheouterpinsontheuserinterfaceportoftheelctroniccontrolboard.There
 shouldbe24VDC.(refertoElectronicControlBoardIdentication,Fig707)
 4.Ifthereisnovoltage,replacetheelectroniccontrolboard.
 5.If24VDCispresentreplacetheUserInterfaceand/ortheribboncable.
Thermistors Description
TheKUHLunitshave4sensors(Thermistors).Eachthermistoriscolorcodedandhasadifferntfunction.
 1.IndoorCoil(Yellow)-locatedontheevaporatorcoilnexttothepowerboard
 2.OutdoorCoil(Blue)-locatedonthecondensorcoil.
 3.DischargeAir(Black)-locatedonthefrontoftheunitinthedischargeairport.
 4.AmbientAir(White)-locatedonthefrontoftheunitinfrontoftheairintake
Thermistor Testing
 1.GainaccesstoElectronicControlBoard.
 2.LocatethermistorpluganddisconnectfromControlBoard.(refertoControlBoardIdentication,FIg707)
 3.Checkforproperresistance.(refertoThermistorResistancevalues,Fig707)
 4.Ifthermistorisoutoftolerance,replacethermistor.

Friedrich Kuhl+ KEQ08A11A Specifications

General

Brand	Friedrich
Model	Kuhl+ KEQ08A11A
Category	Air Conditioner
Language	English