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10.5.6 Connecting Pipe
1. Match the flaring of copper pipe to the center of screwed connection, and then screw the flared nut
up by hands.
2. Screw flaring nut with torque wrench until the spanner clatters, which is shown in the figure below.
Refer to Table 5 to check if the wrench had been tightened (too tight would mangle the nut and lead
leakage).
Diameter(Inch)
φ1/4
φ3/8
φ1/2
φ5/8
φ3/4
3. Degree of curvature of the tubing cannot be too small or the pipe might be broken up. When bend the
piping, bending apparatus shall be applied.
4. Brazing port shall be downward or horizontal when brazing the pipeline. Try to avoid the upward
brazing as shown in figure below which easily affects welding quality and causes leakage.
5. Wrap connecting pipe and the joints that have not insulated with sponge and bind them up with
plastic tape.
10.5.7 Air Purging
The purpose of the air purging is to get rid of moisture and air in the system, otherwise moisture and air
may cause ineffectiveness of the compressor which directly affects the cooling capacity.
1. Purging by Using Vacuum
1) Take out the nut cover of the inlet for refrigerant.
Table 5 the tightening torque needed for tightening nut
Surface thickness(mm)
≥0.5
≥0.71
≥1
≥1
≥1
Tightening torque (N·m)
53
15-30
30-40
45-50
60-65
70-75
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