(V1148)
Leak
(V1149)
Figure 3-1-1
Align copper pipe are with the center of screwed connector and tighten fully the nut of the are by hand.
Tighten the are nut with a torque spanner until the torque spanner makes a click, as shown in Figure 3-1-
1. Moment needed for tightening a nut is shown in Tab. 3-1-1.
Fitting Pipe for Indoor Unit Flaring Nuts Fitting pipe
Torque Spanner
Spanner
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" 1-75 (N·m)
7/8" 85-90 (N·m)
Curvature of piping shall not be too small, or otherwise piping may be broken. So installation personnel
should use a pipe bender to bend pipes.
Upward or longitudinal welding joint method is usually applied to the welding of pipelines. The welding
method that mouth of pipe is downward (face-down welding) should be avoided as far as possible,
because such method is prone to welding defects and even would cause leakage, as shown in Figure 3-1-
3.
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