Daewoo FRU-5711-FRS-U20DA Series Service Manual page 79

Items
3.Vacuum degassing.
4.Refrigerant charging.
* Pipe Connection
Connect a red hose to the high pressure side and a blue hose
to the low pressure side.
* Vacuum Sequence
Open ①,② valves and evacuate for 40 minutes.
Close valve ①.
Compressor
Low
Pressure
※ ※ ※ ※ KEYPOINTING
1) If power is applied during vacuum degassing, vacuum degassing
shall be more effective.
2) Operate compressor while charging refrigerant. (It is easier and
more certain to do like this.)
* 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.
78
Precautions
Evaporator
Hot Pipe
Condenser
Vaccum
Pump
Blue
Yellow
Indicate the weight of
an evacuated bombe
Calculation of amount of refrigerant charged
the amount of refrigerant charged
= a weight after charging
- a weight before charging
(a weight of an evacuated cylinder)
Dryer
High
Pressure
①
②
Red
※ ※ ※ ※ KEYPOINTING
1) Be sure to charge
the refrigerant at
around 25°C.
2) Be sure to keep
-5g in the winter
and +5g in summer.