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4
Fig. 8
[1]
Normal wrench
[2]
Torque wrench
[3]
Pipe socket cap
[4]
Pipe fittings
▶ Insert the refrigerant piping into the copper nut (accessory), and
expand the pipe socket. Refer to the following table for the size of the
pipe socket and the appropriate tightening torque.
▶ Align the connecting pipes, tighten most of the threads of the
connecting nut by hand first, and then tighten the last 1~2 turns of
the threads with a wrench, as shown in the figure above.
External
Tightening
diameter Ø
torque [Nm]
[mm]
6.35
14.2-17.2
9.52
32.7-39.9
12.7
49.5-60.3
15.9
61.8-75.4
19.1
97.2-118.6
Table 4
NOTICE
Apply the appropriate tightening torque according to the installation
conditions. Excessive torque will damage the socket cap. But the cap will
not be tight if you apply insufficient torque which leads to leakages.
▶ Before the socket cap is installed on the pipe socket, apply some
refrigerant oil on the socket (both inside and outside), and then
rotate it three or four times before you tighten the cap.
1
1
Fig. 9
[1]
Apply refrigerant oil
Air Flux – 6721876663 (2023/12)
1
2
3
0010020833-002
Flared
Flared opening
opening
diameter (A)
[mm]
8.3-8.7
90°± 4
12-12.4
A
15.4-15.8
18.6-19
R0.4~0.8
22.9-23.3
1
0010020835-002
WARNING
Toxic gases
▶ Take precautions when welding the refrigerant pipes.
▶ Before you weld the refrigerant pipes, fill the pipes with nitrogen to
discharge the air in the pipes. If no nitrogen is filled in during welding,
an oxide layer will form inside the piping which may cause the air
conditioning system to malfunction.
▶ Welding of the refrigerant pipes can be done when the nitrogen gas
has been replaced or refilled.
▶ When the pipe is filled with nitrogen during welding, the pressure
must be reduced to 0.02 MPa using the pressure release valve.
2
1
Fig. 10
[1]
Copper piping
[2]
Section being brazed
[3]
Nitrogen connection
[4]
Hand valve
[5]
Pressure-reducing valve
45°± 2
[6]
Nitrogen
Refrigerant piping fixing
Angle iron brackets or round steel hangers should be used for fixing.
When the liquid pipe and gas pipe are suspended together, the size of
the liquid pipe shall prevail.
Pipe outer
diameter (mm)
Horizontal pipe
distance (m)
Stand pipe
distance (m)
6.3.6
Air tightness test
Perform the air tightness test on the system according to the
instructions in the installation manual of the outdoor unit.
The air tightness test helps to ensure that the cut-off valves of the
outdoor unit are all closed (maintain the factory defaults).
3
4
6
≤ 20
20 – 40
1.0
1.5
1.5
2.0
Installation
5
6
0010020836-002
≥ 40
2.0
2.5
41
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