The outdoor unit is loaded with sufficient R-22 refrigerant for 5 metres of piping. The air in the indoor unit
and in the pipe must be purged. If air remains in the refrigeration pipes, it will affect the compressor,
reduce to cooling/heating capacity and could lead to a malfuction. Refrigerant for air purging is not
charged in the outdoor unit. Use Vacuum Pump as shown at the figure.
Air-Purge Procedure
8
Outdoor unit Indoor unit
Gas pipe side
Liquid pipe side
Vacuum
Pump
1. Connect each assembly pipe to the appropriate valve on
the outdoor unit and tighten the flare nut.
2. Referring to the illustration opposite, tighten the flare nut
first manually and then with a wrench, applying the
following torque.
3. Connect the charging hose of low pressure side of
manifold gauge to the packed valve having a service
port as shown at the figure.
4. Open the valve of the low pressure side of manifold gauge
counterclockwise.
5. Purge the air from the system 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 10minutes.
This procedure is very important in order to avoid gas leak.
◆
Turn off the vacuum pump
◆
Remove the hose of the low pressure side of manifold gauge.
Pipe
Liquid refrigerant
Gas refrigerant
Gas refrigerant
6.35mm
12.70mm
15.88mm
160
500
700
Outer Diameter Torque(kg
.
cm)
* The designs and shape are subject to
change according to the model.
Installation
46
Adding Refrigerant
Refrigerant must be added if the piping measures more than 5 metres in length.
This operation can only be performed by a qualified refrigeration specialist.
☛ If you have used... Then...
More than 5 metres “A” of refrigerant (R-22)
of piping must be added for each
extra metre.
Less than 5 metres The purge time is normal.
of piping
Refer to the Service Manual for more details on this operation.
MODEL A
7K 20g
9K 20g
12K 30g
18K 30g
24K 40g
00150A(2)-37~53 2/5/01 11:44 AM Page 46
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