Huawei NetCol8000-A045D Quick Manual page 17

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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.

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The metal support should not be in direct 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.

6.3

Pipe Drainage

1. Connect one end of the rubber 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 increase the

pressure of the copper pipe.

3. After drainage, disconnect the rubber 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.

Exhausting Nitrogen from the Indoor Unit Through Three Needle

6.4

Valves

NetCol8000-A045/A055/A090 Downflow

NetCol8000-A060/A120 Downflow

NetCol8000-A045 Upflow

NetCol8000-A060 Upflow

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