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44
A
B
C
D
Liquid side
Valve stem
Stem cap
Gas side
Outdoor unit Indoor unit
Gas pipe side
Liquid pipe side
Service port
A
B
Vacuum Pump
Indoor
A-unit
Indoor
B-unit
The outdoor unit is loaded with sufficient R22 refrigerant for 5m(16ft. 5in) 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 malfunction.
Refrigerant for air purging is not charged in the outdoor unit.
Use Vacuum Pump as shown at the figure.
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.
6 Set valve cork of both liquid side and gas side of packed valve to the open
position.
7 Mount the valve stem nuts and the service port cap to the valve, and
tighten them at the torque of 18N
•m with a torque wrench.
8 Check for gas leakage.
-
At this time, especially check for gas leakage from the 3-way valve’s
stem nuts, and from the service port cap.
Adding Refrigerant
Refrigerant must be added if the piping measures more than 5m(16ft 5in) in length.
This operation can only be performed by a qualified refrigeration specialist.
☛ If you have used... Then...
More than 5m(16ft. 5in) 20g of refrigerant (R22)
of piping must be added for each
extra m(3ft.)
Less than 5m(16ft. 5in) The purge time is normal.
of piping
Refer to the Service Manual for more details on this operation.
❊ The designs and shape are subject to
change according to the model.
Connecting Up and Purging the Circuit
I
NSTALLING THE
O
UTDOOR
U
NIT
Pipe Outer Diameter Torque
Liquid refrigerant 6.35 mm(1/4˝) 160kg•cm(11.6ft•lb )
Gas refrigerant 9.52 mm(3/8˝) 300kg•cm(21.8ft•lb )
Gas refrigerant 12.70 mm(1/2˝) 500kg•cm(36.4ft•lb )