Huawei NetCol5000-A050 Quick Manual page 8

4. When the indoor unit is higher than the outdoor unit, the maximum height difference is 8 m. When the
indoor unit is lower than the outdoor unit, the maximum height difference is 30 m.
5. 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.
6. Use a rubber hose to connect the nitrogen cylinder which connecting the reducing valve and the end of
the copper pipe, then fill nitrogen at 0.03–0.05 MPa into the copper pipe to avoid internal oxidation.
7. After the pipe in the middle is welded, charge nitrogen into the pipe from one pipe end to clear the
foreign matter inside.
8. 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.
7.2
Discharging Nitrogen
Separately exhaust nitrogen from the three needle valves. Separately exhaust nitrogen from the
two needle valves for the water cooling module. When exhausting nitrogen, do not remove the
valve plug in case of losing or damaging it.
Pipe support
Low-
pressure
needle
valve
Discharge
pipe needle
valve
Liquid pipe
needle
valve
8
Wall
Pipe