Connecting The Refrigerant Pipe - Huawei NetCol5000-A User Manual

NetCol5000-A 42 kW Air Cooled In-row Precision Air
Conditioner
User Manual
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3.9.1 Connecting the Refrigerant Pipe

Precautions
Refrigerant pipes can be routed from the bottom or top. Select the pipe routing based on the
actual situation.
Before welding, exhaust all nitrogen from the refrigerant pipe to avoid explosion and personal
injury.
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When selecting the refrigerant pipes, note the following:
1.
Issue 01 (2017-07-27)
The thickness of heat insulation cottons should not be less than 9.2 mm.
When purchasing water pipes, ensure that the water pipe with thermal insulation foam
warped can go through the ports on the bottom and top boards.
When connecting the indoor and outdoor units, you are advised to weld pipes to the
outdoor unit first. Seal the pipe after welding if the welding break exceeds 15 minutes to
prevent dust and moisture from entering the pipe.
Before the welding, take measures to protect needle valves (liquid pipe need valve) within
500 mm from the welding position by removing the valve plug or wrapping the valve with
a piece of wet cloth.
Take protective measures, such as spreading a piece of wet cloth, around the welding
position, to avoid burning the bottom panel, top panel, side panel, internal components,
needle valves, other pipes, thermal insulation foam, power cables, labels, and tags.
During the welding, avoid exposing the refrigerant pipes for over 15 minutes. Otherwise,
system reliability is affected.
To avoid leakage of ventilation channels and damage to copper pipes, seal the holes after
the pipes are routed through the bottom panel. Seal the top of the copper pipes to prevent
foreign matter from entering the refrigerant pipes.
After welding copper pipes that are excessively long or with bends, blow nitrogen into the
pipes to clean foreign matter so that other components will not be affected.
The refrigerant pipe should be wrapped with thermal insulation foam.
Avoid elbows and ensure that the connection between the indoor and outdoor units is the
shortest.
Avoid elbows and ensure that the connection between the indoor and outdoor units is the
shortest.
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