Huawei NetCol5000-A021, Руководство пользователя

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NetCol5000-A021 In-row Air Cooled Smart Cooling
Product
User Manual (208 V)
3 Installation Guide
Issue 03 (2020-01-10) Copyright © Huawei Technologies Co., Ltd. 59
3.10 Connecting Pipes
3.10.1 Connecting Refrigerant Pipes
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 fill 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