Daewoo FRU-541 Series Service Manual page 53

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.
Compresso
Low
Pressur
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.
Indicate the weight
of
52
COOLING CYCLE HEAVY REPAIR
Precautions
Evaporato
Hot
Condense Drye
High
Pressur
Vaccu
m
Blu
Yello
Re
- KEYPOINTING
1) Be sure to charge
the refrigerant at
around 25C.
2) Be sure to keep
-5g in the winter
and +5g in summer.
Calculation of amount of refrigerant
h d
the amount of refrigerant charged
= a weight after charging
- a weight before charging
(a weight of an evacuated cylinder)
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