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Instructions of Unit Installation
Connection of Pipeline
1. Align the flared end of the copper pipe with the center of the thread joint. Manually tighten the
flared end nut.
2. Use torque spanner to tighten the flared end nut until the spanner clatters (Figure 38).
Fitting Pipe for
Indoor Unit
Spanner
The following table describes the torques for tightening nuts of different pipe diameters.
3.The bending angle of the fitting pipe shall not be too large, and otherwise the pipe may break.
Please use a bender when bending the fitting pipes.
4. Use sponge to wrap the connecting pipe and joint , Then use plastic tape to bundle the sponge.
5. Remove the bonnets of the liquid valve and the gas valve.
6. Use an inner hexagon spanner to turn 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 appear after the gas is discharged for 15 seconds. Now 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 Figure 39).
9. Tighten the valve cover. 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 pipelines.
Flaring Nuts Fitting Pipe
Torque Spanner
Fig.38
Pipe Diameter
1/4〞（Inch）
3/8〞（Inch）
5/8〞（Inch）
1/2〞（Inch）
3/4〞（Inch）
7/8〞（Inch）
Connection of Pipelines
One-Way Valve
Gas Valve
Liquid Valve
Inner Hexagon
Spanner
Screwdriver
Fig.39
Tightening Torque
15-30 (N·m)
35-40 (N·m)
60-65 (N·m)
45-50 (N·m)
70-75 (N·m)
80-85 (N·m)
31
Valve Cap
Valve Stem
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