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The following table describes the torques for tightening nuts of different pipe diameters.
3. The bending angle of the refrigerant pipe shall not be too small, otherwise the pipe may break. Please use
a bender when bending the
4. Use sponge to wrap the refirgerant pipe and joint without thermal insulation, and use plastic tape to
bundle the sponge.
5. Remove the caps of the liquid valve and the gas valve.
6. Use an inner hexagon spanner to loose off the spool of the liquid valve for 1/4 circle. At the same time,
use a screwdriver to lift the spool. Then there is discharge of gas.
7. Refrigerant gas shall come out in 15 seconds. Then, close the one way valve
immediately and tighten the bonnet.
8. Fully open the spools of the liquid valve and the gas valve (refer to Fig. 8.12).
9. Tighten the caps of valves. Then use soap water or leakage detector to check if there is leakage at the
position where the indoor unit or the outdoor unit is connected with the refrigerant pipes.
10. If possible, use a vacuum pump to remove air out
"LO" Knob
Liquid Valve
CAUTION
1. When connecting the indoor unit with the refrigerant pipe, do not pull the big and small joints of the indoor
unit forcefully, so as to prevent the capillary of the indoor unit and other pipes from breaking and leaking.
2. The
refrigerant
pipe shall be supported by proper bracket.
by the unit.
32
Pipe Diameter
Tightening Torque
1/4" (inch)
3/8" (inch)
5/8" (inch)
1/2" (inch)
3/4" (inch)
7/8" (inch)
refrigerant
pipes.
n
of
the valve. Refer to Fig. 8.13.
Pressure Gage
Gas Valve
Fig.8.13
15-30 (N·m)
35-40 (N·m)
60-65 (N·m)
45-50 (N·m)
70-75 (N·m)
80-85 (N·m)
Pressure Gage
"HI" Knob
Vacuum Pump
Connecting Hose
The weight of the pipe shall not be withstand
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