TROUBLE DIAGNOSIS
- 76 -
Items
Precautions
4.Vacuum degassing.
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 evacuate for 40 minutes. Close valve
.
5.Refrigerant charging.
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.
KEYPOINTING
- 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.)
KEYPOINTING
- Be sure to charge
the refrigerant at
around 25°C.
- Be sure to keep -5g
in the winer and
+5g in summer
the amount of refrigerant charged= a weight after charging -
a weight before charging (a 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
R134a
Indicate the weight of
an evacuated bombe
