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PROBLEM DIAGNOSIS
Items
4.Vacuum degassing.
5.Refrigerant charging.
Compressor
3
Vaccum
Pump
Pipe Connection
Connect a red hose to the high pressure side and a 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 bombe 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 bombe by subtracting the weight of the evacuated bombe.
Indicates the weight of
an evacuated bombe
R134a
Precautions
Evaporator
Suction pipe
Drier
Condenser
Blue
Calculation of amount of refrigerant charged
the amount of refrigerant charged= a weight after charging -
a weight before charging (the weight of an evacuated cylinder)
- 84 -
2
Low
pressure
Yellow
Red
NOTE:
- 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.)
NOTE:
- Be sure to charge
the refrigerant at
around 25°C [77°F].
- Be sure to keep -5g
in the winer and
+5g in summer
1
High
pressure
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