38
Purging the connected pipes
1. Connect each assembly pipe to the appropriate valve on the outdoor unit and
tighten the flare nut.
2. Tighten the flare nut first with your hands, and then with a torque wrench,
applying the following torque.
Outdoor unit
Indoor unit
Gas pipe side
Liquid pipe side
Outer Diameter
Torque (kgf•cm)
ø6.35 mm
140~170
ø9.52 mm
250~280
ø12.70 mm
380~420
ø15.88 mm
440~480
ø19.05 mm
990~1210
ø22.23 mm
990~1210
• Excessive torque can be cause of gas leakage.
• Make the electrical connection and leave the system into “stand by
mode”. Do not turn on the system!
This is necessary for better vacuum operation (full OPEN position of
Electronic Expansion Valve - EEV -).
3. Connect the charging hose of the low-pressure side of manifold gauge to a
gas service port as seen in the picture.
4. Open the valve of the low pressure side of manifold gauge counterclockwise.
5. Evacuate the air in the connected pipes using the vacuum pump for about
15 minutes.
Make sure that pressure gauge shows -0.1MPa(-76cmHg) after about
10 minutes.
This procedure is very important to avoid a gas leak.
Close the valve of the low pressure side of manifold gauge clockwise.
Turn off the vacuum pump.
Check for 2 minutes if there is any pressure change.
Remove the hose of the low pressure side of manifold gauge.
6. Set a valve cork of liquid and gas service port 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 183kgf•cm with a torque wrench.
8. Check for a gas leak paying particular attention to the 3-way valve’s stem nuts
and to the service port cap (Refer to page 40).
Vacuum
Pump
Manifold gauge
Valve
Gas service port
<Low pressure>
Liquid service port
<High pressure>
(Backward flowing
prevention)
B
(liquid)
Stem nut
Valve stem
A
(Gas)
• The remaining air in the Refrigeration cycle, which contains moisture, may cause malfunction on the compressor.
• Always contact the service center or a professional installation agency for product installation.
Add refrigerant charge according to table below:
If you use a pipe longer than 7.5m,
‘A’g of refrigerant R410A must be added for each extra meter.
If you use a pipe shorter than 7.5m,
The purge time is normal.
Refer to the Service Manual for further details.
Adding Refrigerant
Model
A
24
15
30
40
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