Huawei NetCol8000-A Quick Manual page 13

5.2 Installation Requirements for Inverted U-shaped Traps and Oil Traps
(1) Inverted U-shaped trap (2) Oil trap (3) Tilted air pipe (4) Tilted liquid
pipe
Outdoor unit placed horizontally
• When routing pipes, ensure that the pipes are level and straight. The positive height
difference cannot exceed 30 m, the negative height difference cannot exceed 8 m, and the
total pipe length cannot exceed 100 m.
• The metal support should not directly contact with copper pipes. The gradient of horizontal
pipes should meet the design requirements. The welding points must be smooth and even,
free from any abnormalities such as beading, buildup, crack, roughness, bubble, or air hole.
Pipe Drainage
5.3
1. Connect one end of the leather hose to the nitrogen cylinder with a reducing valve and connect
the other end to the refrigerant copper pipe in a higher position.
2. Adjust the nitrogen reducing valve to set the nitrogen pressure to 10 bar, and add pressure to
the copper pipe.
3. After drainage, disconnect the leather hose from the copper pipe and seal the two ends of the
pipe using tape to prevent foreign matter from entering the pipe.
4. After completing the operations, close the nitrogen cylinder valve.
Outdoor unit placed vertically
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