Sinclair ASD-18AIA - Page 45

DC Inverter Duct Type Air Conditioner Installation and Operation Manual
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8.2.9 Connection of Pipeline
1. Align the ared end of the copper pipe with the center of the thread joint. Manually tighten the ared end
nut.
2. Use torque spanner to tighten the ared end nut until the spanner clatters (Fig.44).
Fig.44
The following table describes the torques for tightening nuts of different pipe diameters.
Table 9
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)
3. The bending angle of the tting pipe shall not be too large, and otherwise the pipe may break. Please use a
bender when bending the tting pipes.
4. Use sponge to wrap the connecting pipe and joint, Then use plastic tape to bundle the sponge.
8.2.10 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 gure 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 watch remains.
● Take out the valve cover of the gas valve together
with the liquid valve.
● Loosing the cord of liquid valve until the pressure
rise to 0 bar.
● Dismantle the tube from the cover of the inlet for
refrigerant then, tighten the cover.
● Loose the valve cord of the gas valve as well as the liquid valve entirely.
● Tighten the valve cover of the gas valve and liquid valve so as to check whether leakage occurred.
Fig.45