26
TROUBLE DIAGNOSIS
3
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
and
and evacuate for 40 minutes. Close
valve
.
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.
Vaccum
Pump
Yellow
Red
Blue
Low
pressure
High
pressure
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
- Be sure to charge the
refrigerant at around
25°C [77°F].
- Be sure to keep -5g in
the winter and +5g in
summer.
the amount of refrigerant charged= weight after
charging - weight before charging (weight of an
evacuated cylinder)
Indicate the weight of an
evacuated charging canister
R134a
Calculation of amount of refrigerant charged
Compressor
Low pressure side
Condenser
Drier
Hot Line
Evaporator
Evaporator
Drain Pipe
3 way valve
High pressure side
