Outdoor unit Indoor unit
Gas pipe side
Liquid pipe side
The outdoor unit is loaded with sufficient R22 refrigerant for a 5-meter pipe.
You should purge the air in the indoor unit and in the pipe.
If air remains in the refrigerant pipes, it affects the compressor. It may cause
reduction of cooling and heating capacity and malfunction. Refrigerant for air
purging is not charged in the outdoor unit.
Use Vacuum Pump as seen in the picture.
1Connect each assembly pipe to the appropriate valve on the outdoor
unit and tighten the flare nut.
2Tighten the flare nut first with your hands, and then with a torque
wrench applying the following torque.
Outer Diameter Torque (kgf•cm)
6.35 mm 140~170
12.70 mm 380~420
15.88 mm 440~480
3Connect the charging hose of low-pressure side of manifold gauge to a
gas service port as seen in the picture.
4Open the valve of the low pressure side of manifold gauge
counterclockwise.
5Purge the air in the connected pipes using vacuum pump for about 10 minutes.
- Close the valve of the low pressure side of manifold gauge clockwise.
- Make sure that pressure gauge show -0.1MPa(-76cmHg) after about
10 minutes.
This procedure is very important to avoid a gas leak.
- Turn off the vacuum pump.
- Remove the hose of the low pressure side of manifold gauge.
6Set a valve cork of liquid and gas service port to the open position.
7Mount the valve stem nuts and the service port cap to the valve, and
tighten them at the torque of 183kgf•cm with a torque wrench.
8Check for a gas leak.
- At this time, especially check for a gas leak from the 3-way valve’s
stem nuts and from the service port cap.
Adding Refrigerant
You must add refrigerant if the pipe is longer than 5 meters.
☛If you use a pipe... Then...
longer than 5 meters, ‘A’g of refrigerant R22 must
be added for each extra metre.
shorter than 5 meters, The purge time is normal.
Refer to the Service Manual for further details.
B
(liquid)
Stem cap
Valve stem
A
(gas)
Vacuum Pump
❊ The designs and shape are subject to change
according to the model.
Model
✴✴18✴✴
✴✴24✴✴
A
30
40
AQT18WJWB IM_E_20227 10/25/04 1:34 PM Page 12