Lo
Vacuum pump
3-Way
valve
Outdoor unit
Liquid side
Indoor unit
Gas side
3-Way
valve
Lo
Charging
cylinder
Outdoor unit
Indoor unit
Liquid side
Gas side
Check valve
(1)
3-Way
valve
Scale
Use a gravimeter. (One that can measure down to
0.1 kg.). If you are unable to prepare such a high-
precision gravimeter you may use a charge
cylinder.
• Evacuation should be done for 3 hours or more
after the pressure is under 5 tor.
(1) Airtight test
Airtight test should be m
ade by pressurizing nitrogen gas to 2.94 MPa. For the test method, refer to the following
figure. (Make a test with the service valves closed. Be also sure to pressurize both liquid pipe and gas pipe.)
The test result can be judged good if the pressure has not been reduced after leaving for about one day after
completion of nitrogen gas pressurization.
(2) Evacuation
Evacuation should be made from the service port provided on the outdoor unit’s service valve to the vacuum
pump commonly used for both liquid pipe and gas pipe. (Make evacuation from both liquid pipe and gas pipe
with the service valve closed.)
* Never perform air purging using refrigerant.
Note : Always add an appropriate amount of refrigerant. (For the refrigerant additional charge)
Too much or too little refrigerant will cause trouble.
WARNING
When installing and moving the air conditioner to another site, recharge after perfect evacuation.
- If a different refrigerant or air is mixed with the original refrigerant, the refrigerant cycle may malfunction and
the unit may be damaged.
To Next Page
Loading...
