LG LSC27931SB Service Manual page 72

Items
4. Vacuum degassing.
5. Refrigerant charging.
Compressor
Condenser
3
Vaccum
Pump
Pipe Connection
Connect the red hose to the high pressure side and the blue hose to the
low pressure side.
Vacuum Sequence
Open valves 1 and 2 and evacuate for 40 minutes. Close valve 1 .
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.
Indicate the weight of an
evacuated charging canister
R134a
Precautions
Evaporator
Suction pipe
Hot Line
Drier
Low
pressure
Blue
Calculation of amount of refrigerant charged
the amount of refrigerant charged= weight after charging -
weight before charging (weight of an evacuated cylinder)
- 71 -
2 1
High
pressure
Yellow
Red
KEY POINT
- If power is applied
during vacuum
degassing, vacuum
degassing shall be
more effective.
- Run the compressor
while charging the
system. It is easier
and works better.
KEY POINT
- Be sure to charge the
refrigerant at around
25°C [77°F].
- Be sure to keep -5g in
the winer and +5g in
summer.