DC INVERTER U-MATCH AIR CONDITIONERS INSTALLATION
Figure 3-1-2
Form 3-1-1 the tightening torque needed for tightening nut
Pipe diameter Tightening Torque
1/4 15-30 (N·m)
3/8 35-40 (N·m)
5/8
60-65 (N·m)
1/2 45-50 (N·m)
3/4 70-75 (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.
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