LG LSC27990TT Service Manual page 80

TROUBLE DIAGNOSIS
Items
4. Vacuum degassing.
5. Refrigerant charging.
Precautions
Pipe Connection
Evaporator
Suction pipe
Compressor Hot Line Dr_ier
Blue
Low t
pressure T
_- High
pressure
Yellow
Red
KEY POINT
- If power is applied
during vacuum
degassing, vacuum
degassing shall be
more effective.
- Run the compressor
Connect the red hose to the high pressure side and the blue hose to the while charging the
low pressure side. system. It is easier
Vacuum Sequence and works better.
Open valves (_ and (_) and evacuate for 40 minutes. Close valve (_).
Charging sequence
1) Check the amount of refrigerant supplied to each model after completing vacuum
degassing.
2) Evacuate charging canister with a vacuum pump.
3) Measure the amount of refrigerant charged.
- Measure the weight of an evacuated charging canister with an electronic scale.
- Charge refrigerant into a charging canister and measure the weight. Calculate the weight
of refrigerant charged into the charging canister by subtracting the weight of an
evacuated charging canister. KEY POINT
E_ Indicate the weight of an
evacuated charging canister
'_ R134a
J
- Be sure to charge the
refrigerant at around
25°C [77°F].
- Be sure to keep -5g in
the winter and +5g in
summer.
I Calculation of amount of refrigerant charged I
the amount of refrigerant charged= weight after charging -
weight before charging (weight of an evacuated cylinder)
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