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English
The following table describes the torques for tightening nuts of different pipe diameters.
Pipe Diameter
Tightening Torque
1/4” (inch)
15-30 (N·m)
3/8” (inch)
35-40 (N·m)
5/8” (inch)
60-65 (N·m)
1/2” (inch)
45-50 (N·m)
3/4” (inch)
70-75 (N·m)
7/8” (inch)
80-85 (N·m)
The bending angle of the fi tting pipe shall not be too small, otherwise the pipe may break. Please use a
3.
bender when bending the fi tting pipes.
Use sponge to wrap the connecting pipe and joint without thermal insulation, and use plastic tape to
4.
bundle the sponge.
Remove the cap of the liquid valve and the gas valve.
5.
Use an inner hexagon spanner to turn 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 appear after the gas is discharged for 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. 8.12).
8.
Tighten the valve cover. 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 pipelines.
If possible, use a vacuum pump to remove air out of the valve. Refer to Fig. 8.13.
10.
Pressure Gage
“LO” Knob
Pressure Gage
“HI” Knob
Vacuum Pump
Liquid Valve
Gas Valve
Connecting Hose
8.13
Fig.
CAUTION
When connecting the indoor unit with the connecting pipe, do not pull the big and small joints of the indoor
1.
unit forcefully, so as to prevent the capillary of the indoor unit and other pipes from breaking and leaking.
The connecting pipe shall be supported by proper bracket. The weight of the pipe shall not be withstand
2.
by the unit.
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5/13/2010 11:43:36 AM
5/13/2010 11:43:36 AM