Exhausting Nitrogen - Huawei NetCol5000-A035 Quick Manual

1. When welding pipes, ensure that the pipes are dry. You are recommended to weld the pipes between
the indoor and outdoor units, then connect the two ends of the pipe to the indoor unit and outdoor unit.
2. After the pipe in the middle is welded, charge nitrogen into the pipe from one pipe end to clear the
foreign matter inside.
3. Do not expose welding positions to the environment for a long time. Take sealing measures for
welding positions. If foreign matter exists at the welding position, rubber it out using non-water alcohol
or damp cloth before the welding.
Pipe
support

Exhausting Nitrogen

5.2
Low-
pressure
needle
valve
Wall
Pipe
Unit: mm
Discharge
pipe
needle
valve
Liquid pipe
needle valve
12
Top pipe routing
(1) Inverted traps
(2) Oil traps
(3) Tilted gas pipe
(4) Tilted liquid pipe
•
Exhausting nitrogen from the three
valves respectively. Do not remove
the valve plug in case of loss.
•
The NetCol500-A072 has no
protective sheet metals.