34
English
9.8.2 Connection of the Refrigerant Pipe
Align the fl ared end of the copper pipe with the center of the thread joint. Manually tighten the fl ared end
1.
nut.
Use torque spanner to tighten the fl ared end nut until the spanner clatters (Fig. 9.12).
2.
Fitting Pipe for
Indoor Unit
Flaring
Nuts
Spanner
Torque Spanner
Fittng Pipe
Liquid Valve Gas Valve
Valve Cap
Inner Hexagon Spanner
Screwdriver
One-Way
Valve
Valve
Stem
9.12
Fig.
9.13
Fig.
The following table describes the torques for tightening nuts of different pipe diameters.
Pipe Diameter
Tightening Torque
φ
6.34mm
15-30 (N·m)
φ
9.52mm
35-40 (N·m)
φ
15.88mm
60-65 (N·m)
φ
12.7mm
45-50 (N·m)
φ
19.05mm
70-75 (N·m)
φ
22.05mm
80-85 (N·m)
The bending angle of the
3.
bender when bending the
Use sponge to wrap the refrigerant pipe and joint without thermal insulation, and use plastic tape to
4.
bundle the sponge.
Remove the caps of the liquid valve and the gas valve.
5.
Use an inner hexagon spanner to loosen off the spool of the liquid valve for 1/4 circle. At the same time, use a
6.
screwdriver to lift the spool. Then there is discharge of gas.
Refrigerant gas shall come out in 15 seconds. Then, close the one way valve
7.
immediately and tighten the bonnet.
Fully open the spools of the liquid valve and the gas valve (refer to Fig. 9.13).
8.
Tighten the caps of the valves. Then use soap water or leakage detector to check if there is leakage at the
9.
position where the indoor unit or the outdoor unit is connected with
If possible, use a vacuum pump to release air out of the valve. Refer to Fig. 9.14.
10.
the refrigerant pipes.
fitting pipe shall not be too small, otherwise the pipe may break. Please use a
fitting pipes.
