Gree GUHD series - Page 76

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Align the flared end of copper pipe with the center of threaded connector and use your hands to
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shown in Fig. 3-1-1. See Table 3-1-1 for the torque required for tightening the nuts.
Figure 3-1-2
Form 3-1-1 the tightening torque needed for tightening nut
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
)7
0-75 (N·m)
7/8
(
Inch
)
80-85 (N·m)
Ɣ
The bend of pipe shall not be too small; otherwise the pipe might be broken. Please use pipe bender
to bend the pipe.
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Generally, the pipe shall be welded with the weld junction upward or horizontal. Avoid welding with
the pipe opening downward. (Downward welding is easy to cause defects, which may affect the weld quality
or even cause leakage, as show in Fig. 3-1-3).
Figure 3-1-3
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Use sponge to wrap the connection pipes and connectors that are not thermally insulated, and tighten
with plastic tapes.
b. Vacuum and Leakage Detection
Ɣ
Remove the cap from liquid valve and gas valve.
Ɣ
Align with the pipe center and tighten the jointing nuts adequately with your hand.
Ɣ
Tighten the nuts with wrench.
Ɣ
Remove the 1-way cap from the gas valve.
Ɣ
Use the hexagonal socket spanner to rotate the element of liquid valve for 1/4 turns and use the
screwdriver to prop up the element of gas valve to discharge the gas.
Ɣ
Discharge the gas for 15 seconds, until refrigerant gas appears. The, immediately close the 1-way
valve and tighten the valve cap.
Ɣ
Open the element of liquid valve and gas valve to full (See Fig. 3-1-4).