LG LP-E5020CL Service Manual page 57

WHAT TROUBLED
Electric troubles
(Magnetic
contactor)
Others
9.5 Trouble checking by protection devices
Fault
High Discharge
Low
Discharge
High
Suction
Pressure
Low
Suction
Pressure
COMPLAINTS
Defective contact.
Defective contact point.
Rusting and faults in the iron
core contact face. Defective
contact of the
operating switch.
Improper installation
Cause
Condenser cooling air extremely hot or
insufficient air flow through the condenser
Inside of the condenser tube is clogged.
Air in the refrigeration cooling cycle.
Suction pressure is higher than standard.
Faulty discharge valves or suction valves of
the compressor.
Refrigerant low-charge or leakage.
Suction pressure is lower than standard.
Intake air extemely hot or excessive air flow
through the evaporator coil.
Refrigerant over-charge.
Faulty discharge valve or suction valve of
the compressor.
Discharge pressure is higher than standard
Intake air extremely cold or insufficient air
flow through the evaporator coil.
Refrigerant short-charge or leakage.
Restricted liquid in the suction line.
HOW TO CHECK
Checking
Checking
1. Check the operation of the outdoor motor.
2. Check discharge and suction, air circula-
tion.
Clean condenser coil.
Purge air from the cycle.
See "High Suction Pressure".
1. Check unit operation input
2. Check the suction pressure.
Add refrigerant: repair leakage if any.
See "Low Suction Pressure".
1. Check fresh air, intake or check for
leakage of the return air.
2. Check air flow quantity.
Purge the refrigerant.
Check the operating input.
See "High discharge Pressure".
1. Check air flow quantity.
2. Check air filter.
3. Check evaporator coil frosting
Add refrigerant, repair leakage, if any.
Check the capillary tube and the strainer.
– 57 –
REMEDY
Repair and clean or
replace it.
Correct it.
Check/Correcitve Action