LG LSSB2691ST Service Manual page 26

TROUBLE DIAGNOSIS
Items
4. Vacuum degassing.
5. Refrigerant charging.
Compressor
3
Low pressure side
Pipe Connection
Connect the red hose to the high pressure side and the blue
hose to the low pressure side.
Vacuum Sequence
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.
Indicate the weight of an
evacuated charging canister
R134a
Precautions
Evaporator
Evaporator
Hot Line
Drain Pipe
Drier
Condenser
High pressure side
Blue
Vaccum
Pump
Calculation of amount of refrigerant charged
the amount of refrigerant charged= weight after
charging - weight before charging (weight of an
evacuated cylinder)
26
3 way valve
High
pressure
Low
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 winter and +5g in
summer.