Refrigeration Piping Work; Refrigeration Piping Work Procedures - GREE ELECTRIC GUHD09NK3CO Service Manual

3 REFRIGERATION PIPING WORK

3.1 Refrigeration Piping Work Procedures

a. Connection Pipe
The connection pipe must meet the following requirements. The three basic principles are that the pipe shall be
kept dry, clean and no leakage.
in Fig. 3-1-1. See Table 3-1-1 for the torque required for tightening the nuts.
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 3-1-1
Figure 3-1-2
Form 3-1-1 the tightening torque needed for tightening nut
Pipe diameter
1/4 Inch
( )
3/8 Inch
( )
5/8 ( Inch )
1/2 Inch
( )
3/4 Inch
( )
7/8 Inch
( )
Tightening Torque
15-30 (N·m)
35-40 (N·m)
60-65 (N·m)
45-50 (N·m)
0-75 (N·m)
7
80-85 (N·m)
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