A/A DC INVERTER U-MATCH AIR CONDITIONERS INSTALLATION
87
Figure 3-1-1
Align the flared end of copper pipe with the center of threaded connector and use your hands to securely
tighten the flared nuts.
Tighten the flared nuts with torque wrench, until you hear a ‘KATA” sound from the torque wrench, as shown in
Fig. 3-1-1. See Table 3-1-1 for the torque required for tightening the nuts.
Figure 3-1-2
Form 3-1-1 the tightening torque needed for tightening nut
Pipe diameter Tightening Torque
1/4＂（Inch） 15-30 (N·m)
3/8＂（Inch） 35-40 (N·m)
5/8＂（Inch）
60-65 (N·m)
1/2＂（Inch） 45-50 (N·m)
3/4＂（Inch） 70-75 N·m)
7/8〞（Inch） 80-85 (N·m)
The bend of pipe shall not be too small; otherwise the pipe might be broken. Please use pipe bender to bend
the pipe.
Generally, the pipe shall be welded with the weld junction upward or horizontal. Avoid welding with the pipe
opening downward. (Downward welding is easy to cause defects, which may affect the weld quality or even
cause leakage, as show in Fig. 3-1-3).
Figure 3-1-3
Use sponge to wrap the connection pipes and connectors that are not thermally insulated, and tighten with
plastic tapes.
2） Vacuum and Leakage Detection
Remove the cap from liquid valve and gas valve.
Align with the pipe center and tighten the jointing nuts adequately with your hand.
Tighten the nuts with wrench.
Remove the 1-way cap from the gas valve.
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