Tempcool TC-120B4 - Troubleshooting Common Issues; Cooling and Airflow Problems

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Condenserfanruns,
compressordoesnot
Faultycompressorwiring
orbadcompressor
Checkwiring.Replacecompressorifnecessary.
Compressorrunsbut
condenserfandoes
not
Faultycondensermotor
wiring
Checkwiring.
Motoroffonthermal
overload
Allowmotortocoolandseeifmotorrestarts.Check
ampdraw.Iftoohighopendriversheave.Replace
motorifthermaloverloadcontinuestotrip.
Faultymotor Replacecondenserfanmotor
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Problem Cause Remedy
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LowAirflow Dirtyfilterorcoil Replacefiltersandcleancoils
RestrictiveAccessoriesor
Ductwork
Removeorreducerestrictions.Straightenductwork,
reducelengthorincreaseductsize.Cleardebrisoutof
inlets,outletsandducts.Moveunitawayfromwallsor
otherrestrictionstoairflow.
Drivensheavetoofar
open
Closesheavetoincreaseblowerspeed.
V‐beltsslipping Cleanorreplacebeltsandtighten.
Insufficientcooling Incorrectlysizedunit Checksystemrequirements.
LowAirflow SeeLow‐AirflowProblem
LowRefrigerantLevels Checkrefrigerantpressuresandcharge
Defectiveorobstructed
TXvalve
Repairorreplacevalve
Temperaturesignalto
CopelandCompressor
controllernotcorrect
SignalfromWatlowcontrollertoCoplandshouldbe+5.0
vdcformaximumoutputfromthecompressor.The
voltagewilldropifthecoiltemperaturedropscloseto
32
o
F.ChecksensorWatlowforproperoperation
Compressorunloader
solenoidisstuckopen
SeeCoplandtroubleshootinginformation.Replacevalve
ifnecessary