Lennox eNeRGy Series Installation, Operating And Maintenance page 60

MAINTENANCE DIAGNOSTIC
REFRIGERATION
FAULT
MAINTENANCE DIAGNOSTIC
HP FAULT
Strong variations of pressure (2 to
3 bars). Expansion valve "hunting"
Very high discharge temperature,
High amps measured
compressor
eNeRGy-IOM-2020.12-EN
POSSIBLE CAUSE AND SYMPTOMS
Incorrect airflow rates
Moisture or contaminants in the system
Moisture or contaminants in the system
Condenser coil is obstructed
Recycled Hot Air
Incorrect adjustment of the expansion valve
Low refrigerant charge
The pressure regulator is not sufficiently
supplied with liquid
Very high superheat, very hot compressor
at
Four Way reversing valve possibly blocked,
abnormal noise from the valve, low LP and
increasing HP
SOLUTION
Heat pump mode:
Check the filter before the indoor coil measure
and estimate the airflow rate increase the
speed of the fan
Cooling mode:
Check the condenser fan
Summer operation
Several hours after the unit has stopped, check
for the presence of
substances
If the circuit pressure is higher (<1bar) than the
saturated pressure corresponding to the
measured outdoor temperature, there is
possibility that some contaminants are present
in the system.
Reclaim the refrigerant, and vacuum the circuit
(For flammable refrigerant, please follow the
procedure described in the manual) Recharge
the unit
Check the condenser coil and clean is necessary
Check clearance around the condenser
Refer to the LP FAULT section
Repair the leak and fill with liquid
Refer to the LP FAULT section
Increase subcooling
Reduce the superheat on the expansion valve.
Check the pressure drop on the filter drier in
the suction line
Check the operation of the valve by going
through cycle inversions. Change if necessary.
Refer to LP FAULT
non-condensable
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