Air Handlers Envirofresh Series Manuale di istruzioni per l'installazione, il funzionamento e la manutenzione - Pagina 16
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Troubleshooting – Refrigeration
FAULT
Compressor not operating
Noisy compressor.
Compressor fault
indication.
HP fault indication.
LP fault indication
POSSIBLE CAUSE
No power to compressor
Seized compressor,
Defective compressor
motor.
Incorrect rotation.
Expansion valve
malfunction.
Lack of oil.
Overload trip.
HP switch faulty.
Reduced airflow.
System overcharged.
Apparent with high room
or external temps.
Coil clogged.
Liquid line valve not
energized.
LP switch faulty
Reduced airflow
Icing coil.
Lack of refrigerant.
Clogged filter drier.
SHC/TA
REMEDY / ACTION
Check fuses, MCBs, contactors, and
control circuit wiring. Step energised on
controller.
Check air flow failure switches.
Check delay timer operation, check
controller timer operation. Change
compressor.
Check winding resistance-replace
compressor.
Change phase rotation. Check phase
rotational devise.
Ensure feeler bulb is tight on suction and
superheat is correct at 5
Repair leaks if any, add oil if required.
Reset and investigate reason.
Check cut out pressure and replace if
necessary.
Reset switch, check volumes, change
filters.
Reset switch, remove excess refrigerant.
Clean coil.
Defective solenoid. Replace. Check
control feed.
Check cut out pressure and replace if
necessary.
Reset switch, check volumes, change
filters.
Check defrost and frost stat, gas charge
and expansion valve.
Check for leaks- repair and recharge
system
Replace.
0
C.