Prerequisites
Before welding, exhaust all nitrogen from the refrigerant pipe to avoid explosion
and personal injury.
● When welding the pipes connecting to the indoor unit, protect the needle valve
and its tag.
● Before welding, take protective measures for needle valves (discharge pipe
needle valve) within 500 mm of the welding position (by taking out the valve
plug or wrapping the valve with a wet cloth).
● During welding, avoid burning the bottom plate, top plate, and side panels,
especially the thermal insulation foam, labels, water pipes, and cables on the
side panels.
● During welding, do not expose the refrigerant pipes for over 15 minutes.
Otherwise, system reliability may deteriorate.
● To avoid air leaks and damage to copper pipes, seal the holes after the pipes
are routed. Seal the ends of the copper pipes to prevent foreign matter from
entering the refrigerant pipes.
● All refrigerant pipes should be wrapped with thermal insulation foam.
● Avoid elbows and ensure that the pipe route between the indoor and outdoor
units is as short as possible.
● Use a rubber hose to connect the nitrogen cylinder which connecting the
reducing valve and the end of the copper pipe, then
ll nitrogen at 0.03–0.05
MPa into the copper pipe to avoid internal oxidation.
Refrigerant Pipe
Refrigerant pipes can be routed from the top or bottom. Select a routing mode
based on the actual situation.
Table 3-10 Equivalent length of components
Pipe Outer
Diameter
(inch)
45-Degree
Bend (m)
90-Degree
Bend (m)
180-Degree
Bend (m)
T-shaped 3-
Way Valve
(m)
5/8 0.17 0.3 0.6 0.7
3/4 0.2 0.35 0.7 0.8
7/8 0.24 0.42 0.8 1.2
NetCol5000-A025 In-row Air Cooled Smart Cooling
Product
User Manual (300 mm Width) 3 Installation Guide
Issue 15 (2020-12-10) Copyright © Huawei Technologies Co., Ltd. 61
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