EngA AF Series

A
AF / DCU MANUAL
IOM-52 23 of 23 Apr 13 R2
TROUBLESHOOTINGCHART
Symptoms Problem Cure
Highheadpressure DirtyCondenser Cleanorwash
Flattenedorhaildamaged
fins
Combfins
Condenserfanmotorsnot
running
Checkandcorrectproblem
Brokencondenserfanblade Replaceblade
Defectiveorincorrectlyset
condenserfancycling
control
Adjustorreplaceasrequired
Condenserair,short
circuiting
Checktemperatureofinletairandcorrectas
required.Ensureproperairflowclearances.
Systemoverchargedwith
refrigerant
Reclaimexcessrefrigerant
Noncondensableinsystem Reclaimrefrigerant,evacuatesystem,recharge
withnewrefrigerant
Controlrelays
chatterorsolenoid
valvesnot
energized
Voltagedropinfieldwiring
tosolenoidsorthermostat.
(greaterthan10%)
Checkvoltageatsolenoidorrelaywhenitis
energized,Ifitislessthan10%ofratedvoltage,
checkwiresize,ordeterminecauseandrepairas
required.
Primaryvoltagenotwithin
10%ofunitratingplate.
Haveelectriciancheckandrepairasrequired.
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