Air Handlers Envirofresh Series Manuale di istruzioni per l'installazione, il funzionamento e la manutenzione - Pagina 17
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Troubleshooting – Refrigeration
FAULT
POSSIBLE CAUSE REMEDY / ACTION
Suction pressure too low.
Insufficient cooling
(High suction, low head)
Insufficient cooling
(Low suction, low head)
Insufficient cooling(High
suction, low superheat)
Insufficient cooling
(Low suction, high head)
Insufficient heating (low
suction, low head)
Insufficient heating (High
suction, low superheat)
Insufficient heating (low
suction high head)
System not changing over
to heating
Reduced airflow.
Clogged filter drier.
Obstruction in expansion
valve.
4 port valve not fully
engaged or internal leak.
Icing coil.
Low on refrigerant.
Indoor check valve leaking.
Outdoor check valve not
fully open.
Icing coil.
Low on refrigerant.
4 port valve not fully
engaged or internal leak.
Outdoor check valve
leaking.
System overcharged.
Outdoor check valve stuck
closed.
4 port valve not operating
or stuck.
SHC/TA
Check volumes, change filters.
Replace.
Inspect, clean or replace.
Try to free by valve by operating or
replace.
Check air volume and indoor frost stat.
Check for leaks- repair and recharge
system
Replace.
Replace.
Check air volume and de-frost stat.
Check for leaks- repair and recharge
system
Try to free by valve by operating or
replace.
Replace.
Reduce charge.
Replace.
Defective solenoid. Replace. Check
control feed. Try to free by valve by
operating or replace.