Huawei NetCol8000-A045D User Manual page 107

NetCol8000-A(045, 055, 060, 090, 120) In-room Air
Cooled Smart Cooling Product
User Manual
● When connecting the indoor and outdoor units, you are advised to weld pipes
to the outdoor unit first. Seal the pipe after the welding interval exceeds 15
minutes to prevent dust and water from entering the pipe.
● During the welding, 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 valve, 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 influenced.
● When pipes are routed through holes on the bottom plate, seal the holes to
prevent air duct leakage and copper pipe damage. Seal the ends of copper
pipes to prevent foreign matter from entering refrigerant pipes.
● After welding a long copper pipe or a copper pipe with a bend, clean the pipe
with nitrogen to prevent foreign matter from affecting other parts.
● Wrap the refrigerant pipes with thermal insulation foam.
● Avoid bends and ensure that the connection between indoor and outdoor units
is the shortest.
When selecting the refrigerant pipes, note the following:
1.
2.
3.
4.
5.
Table 4-5 Equivalent length of components
Copper Pipe
Outer
Diameter
(inch)
3/8
1/2
Issue 05 (2020-10-10)
NO TICE
Avoid bends and ensure that the connection between indoor and outdoor
units is the shortest.
After determining the best pipe route between the indoor and outdoor units,
calculate the number of the components that cause local resistance loss, for
example, elbows, and convert them into the equivalent length to straight
pipes.
The total length of pipes connecting the indoor and outdoor units equals to
the equivalent length of straight pipes plus the length of the straight pipes
connecting the indoor and outdoor units.
You are advised to select the pipes based on the total length of the pipes
connecting the indoor unit and outdoor unit, because different pipe diameters
influence the voltage drop and performance of the cooling system.
Pipe length mentioned in this document is the equivalent length.
45-degree
Bend (Unit:
m)
0.12
0.14
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90-degree 180-degree
Bend (Unit: Bend (Unit:
m) m)
0.2 0.4
0.25 0.5
4 System Installation
T-shaped 3-
Way Valve
(Unit: m)
0.6
0.65
97