LG SXS GR-P257/L257 - Manual (Page 78)

TROUBLE DIAGNOSIS
- 76 -
Items Precautions
4.Vacuum degassing.
Pipe Connection
Connect a red hose to the high pressure side and a blue hose to the
low pressure side.
Vacuum Sequence
Open
ቢ, ባ valves and evacuate for 40 minutes. Close valve ቢ.
5.Refrigerant charging.
Charging sequence
1) Check the amount of refrigerant supplied to each model after completing vacuum
degassing.
2) Evacuate bombe with a vacuum pump.
3) Measure the amount of refrigerant charged.
- Measure the weight of an evacuated bombe with an electronic scale.
- Charge refrigerant into a bombe and measure the weight. Calculate the weight of
refrigerant charged into the bombe by subtracting the weight of an evacuated bombe.
KEYPOINTING
- If power is applied
during vacuum
degassing, vacuum
degassing shall be
more effective.
- Operate compressor
while charging
refrigerant. (It is
easier and more
certain to do like
this.)
KEYPOINTING
- Be sure to charge
the refrigerant at
around 25°C.
- Be sure to keep -5g
in the winer and
+5g in summer
the amount of refrigerant charged= a weight after charging -
a weight before charging (a weight of an evacuated cylinder)
Calculation of amount of refrigerant charged
2 1
3
Compressor
Low
pressure
Condenser
High
pressure
Drier
Evaporator
Red
Yellow
Blue
Vaccum
Pump
Suction pipe
R134a
Indicate the weight of
an evacuated bombe