Items
Precautions
4. Vacuum degassing.
Pipe Connection
Connect the red hose to the high pressure side and the blue hose to the
low pressure side.
Vacuum Sequence
Open valves 1 and 2 and evacuate for 40 minutes. Close valve 1 .
5. Refrigerant charging.
Charging sequence
1) Check the amount of refrigerant supplied to each model after completing vacuum
degassing.
2) Evacuate charging canister 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 charging canister by subtracting the weight of an
evacuated charging canister.
KEY POINT
- If power is applied
during vacuum
degassing, vacuum
degassing shall be
more effective.
- Run the compressor
while charging the
system. It is easier
and works better.
KEY POINT
- Be sure to charge the
refrigerant at around
25°C [77°F].
- Be sure to keep -5g in
the winer and +5g in
summer.
the amount of refrigerant charged= weight after charging -
weight before charging (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
Hot Line
R134a
Indicate the weight of an
evacuated charging canister
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