LG MULTI V 5 Manual Book page 84

4.3 Oil Return Valve
1. It is located at the bottom of the accumulator and operates after the compressor running to supply oil to
the compressor.
2. When the compressor starts operating, oil solenoid valve will be ON for minutes. check if there is opera-
tion noise on the solenoid valve or pipe vibration
3. It turns ON right after the compressor stop
4. Solenoid valve can turn ON and OFF repeatedly by the condition of cycle operation. this is not a mal-
function.
5. Insulation resistance in the state of connecting the valve to coil should be over 100mΩ when measure it
with DC mega tester(DC 500V)
■ Checking Method (Flow Chart)
Checking start
It can be heard the
operation sound
when the power is turned on
the solenoid valve?
Yes
Is it warm when touch
the coil in non-operating
condition of the solenoid valve
coil during operation?
Yes
No malfunction of oil return valve
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No
Coil replacement
No
Coil replacement
4.4 Hot gas Bypass Valve for Continuous Heating
1. Defrost operation eliminates ice attached on heat exchanger, recovering performance of heat exchanger.
2. Two solenoid valves will be on by turns in the extent of 6 minutes when separated defrosting is on.
3. It will be turned of right after the end of separated defrosting.
4. The change of the operation condition by the operation of solenoid valve can be checked by the before
and behind temperature of bypass piping and the sound of refrigerant.
5. Insulation resistance in the state of connecting the valve to coil should be over 100mΩ when measure it
with DC mega tester(DC 500V).
■ Checking Method (Flow Chart)
Checking start
It can be heard the
operation sound
when the power is turned on
the solenoid valve?
Yes
In case of non-
operating condition
of solenoid valve coil
during operation,
the temperature of rear
end of the valve is low and
discharging temperature
of compressor is high?
- Upper side defrost operation
mode : check the upper side
hot gas solenoid valve
- Lower side defrost
operation mode : check
the lower side hot gas
solenoid valve
Yes
In case of non-
operating condition of
solenoid valve coil during
operation,
the temperature of rear end of
the valve is 5℃ higher than
the temperature
of non-operating
condition?
Yes
No malfunction of Hot gas
Bypass Valve for Continuous
Heating
No
Coil replacement
No
Valve replacement
No
Valve replacement
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