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C
I
OMPLETING THE
NSTALLATION
Connecting Up and Purging the Circuit
Outdoor unit
Gas pipe side
A
Liquid pipe side
B
*
The designs and shape are subject to
change according to the model.
Valve stem
Stem cap
12
E-
The outdoor unit is loaded with sufficient R22 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 malfunction.
Refrigerant for air purging is not charged in the outdoor unit.
Use Vacuum Pump as shown at the figure.
1
Indoor unit
C
2
D
3
4
5
Vacuum Pump
6
7
8
A
(gas)
Adding Refrigerant
B
Refrigerant must be added if the piping measures more than 5 metres in length.
(liquid)
This operation can only be performed by a qualified refrigeration specialist.
Refer to the Service Manual for more details on this operation.
Connect each assembly pipe to the appropriate valve on the outdoor unit
and tighten the flare nut.
Referring to the illustration opposite, tighten the flare nut first manually and
then with a torque wrench, applying the following torque.
Outer Diameter
6.35 mm
9.52 mm
Connect the charging hose of low pressure side of manifold gauge to the
packed valve having a service port as shown at the figure.
Open the valve of the low pressure side of manifold gauge
counterclockwise.
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.
Set valve cork of both liquid side and gas side of packed valve to the open
position.
Mount 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.
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.
If you have used...
More than 5 metres
of piping
Less than 5 metres
of piping
Torque (kgf•cm)
140~170
250~280
Then...
'20'g of refrigerant R22
must be added for each
extra metre.
The purge time is normal.
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