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8.5.6 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).
Table 5 the tightening torque needed for tightening nut
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.
8.5.7 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
● Take out the nut cover of the inlet for refrigerant.
● Connect the tube of the vacuum watch with the vacuum
pump, having the low-pressure end linking to the inlet for
refrigerant. As shown in figure on right.
● Starting the vacuum pump, when the indicator turns to-1
bar, closing the low pressure handle and stopping vacuum.
Keep for 15 minutes, ensuring the pressure of the vacuum
DC Inverter Cassette Type Air Conditioner Installation and Operation Manual
Surface thickness(mm)
≥0.5
≥0.71
≥1
≥1
≥1
Solder
Burner
Side facing
Downward facing
Tightening torque (N·m)
15-30
30-40
45-50
60-65
70-75
Upward facing
53
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