Daewoo FRN-U20BV, Service Manual

Page: 50 / 61

COOLING CYCLE HEAVY REPAIR
* 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.
3.Vacuum degassing
Precautions Items
Compresso
Evaporato
Drye Condense
Vaccu
m
Hot
Blu
Yello
Re
High
Pressur
Low
Pressur
①
②
KEYPOINTING
1) If power is applied during vacuum degassing, vacuum degassing
* 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.
4.Refrigerant charging
shall be more effective.
2) Operate compressor while charging refrigerant. (It is easier and
more certain to do like this.)
the amount of refrigerant charged
= a weight after charging
- a weight before charging
(a weight of an evacuated cylinder)
Calculation of amount of refrigerant
- KEYPOINTING
1) Be sure to charge
the refrigerant at
around 25C.
2) Be sure to keep
-5g in the winter
and +5g in summer.
Indicate the weight
of
49