LG Multi V 5 - Page 83

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_TROUBLE SHOOTING GUIDE BOOK _
4.2 Sub Cooling Bypass Valve
1. When the compressor starts, the sub cooling bypass valve is ON for minute. At this time, check whether
the noise or pipe vibration occurs In solenoid valve
2. Turn on the valve 5 seconds after stopping the compressor to quickly remove the difference of high /
low pressure
3. If the compressor suction pipe temperature drops below target temperature, turn on the sub cooling
bypass valve.
4. Depending on the cycle status, the sub cooling bypass valve may remain ON. This is not a malfunction.
5. The change of operation status by the solenoid valve operation can be confirmed by the temperature
before and after the bypass pipe and the refrigerant sound.
6. 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)
It can be heard the
operation sound
when the power is turned on
the solenoid valve?
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?
In case of 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?
Coil replacement
Valve replacement
Valve replacement
Checking start
No malfunction of sub cooling
bypass valve
Yes
Yes
Yes
No
No
No
Basic Part
Multi V 5
Intorduction
Trouble Shooting
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