BU Module
16
Fig. 22
②
If the thermal insulation of the refrigerant pipe is not removed, please do not bend the pipe.
Otherwise, it maybe leads the pipe to crack. It is better to make an incision with a knife in the
thermal insulation and removes it. After elbow operation is finished, recover the thermal
insulation with binding band.
3)
The process of install refrigerant pipes
①
Remove the screw caps from the pipes.
②
Align the flared end of copper tube with the center of pipe joint. Tighten the nuts by hands. (If
the flared end of copper tube and the center of pipe joint are not in coaxial, it is hard to tighten
the nuts by hands, please do not tighten it with spanners, because the screw thread may be
broken by force).
③
Tighten the flaring nuts with torque wrench until you hear a “click”. (The spanner and torque
wrench should be perpendicular to the refrigerant pipeline).
④
The following table for the torque required to tighten the nuts.
Table 10
Pipe
diameter
(mm/inch)
Thickness of
copper
tube(mm/inch)
Tightening
torque
(N·m/1bf·ft)
Φ
6.35(1/4)
≥
0.8(1/32) 15
～
30(11~22)
Φ
9.52(3/8)
≥
0.8(1/32) 35
～
40(26~29)
Φ
12.7(1/2)
≥
0.8(1/32) 45
～
50(33~37)
Φ
15.9(5/8)
≥
1.0(1/25) 60
～
65(44~48)
Φ
19.05(3/4)
≥
1.0(1/25) 70
～
75(52~55)
Fig. 23
CAUTION
1)
During the connection of the indoor unit and BU module to the refrigerant pipe, never pull any joints of
the indoor unit and the BU module by force; otherwise the capillary pipe or other pipe may crack,
which then would result in leakage.
2)
The refrigerant pipe should be supported by brackets, that is, don’t let the unit withstand the weight of
it.
3)
For the Super Free Match system, each pipe should be labeled to tell which system it belongs to avoid
mistaken inaccurate piping.
Summary of Contents for FXA2A-D
Page 4: ......
