Connecting Refrigerant Pipes - Huawei NetCol8000-A045D Quick Manual

6

Connecting Refrigerant Pipes

6.1
Laying Engineering Pipes
•
When the outdoor unit is installed horizontally, the outdoor unit and the low temperature
component must be at the same horizontal plane. When the outdoor unit is installed vertically,
the outdoor unit must not be lower than the low temperature component, and the height
difference cannot exceed 1.5 m.
• If the outdoor unit is placed higher than the indoor unit, when calculating the height difference,
use the bottom of the compressor as the reference for the indoor unit and the top of the
condenser as the reference for the outdoor unit. The maximum height difference is 30 m.
• If the outdoor unit is placed lower than the indoor unit, when calculating the height difference,
use the bottom of the compressor as the reference for the indoor unit and the bottom of the
condenser as the reference for the outdoor unit. The maximum height difference is 8 m.
• An oil trap should be installed every 5 m to 6 m in the vertical direction along the gas pipe to
ensure system reliability.
•
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.
•
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.
• After the pipe in the middle is welded, charge nitrogen into the pipe from one pipe end to clear
the foreign matter inside.
•
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.
•
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.
6.2
Installation Requirements for Inverted U-shaped Traps and Oil Traps
NetCol500-A060/NetCol500-A080/NetCol500-A120
If the outdoor unit is higher than the indoor unit, add a reverse U-shaped trap at the inlet and
outlet of the outdoor unit. The inverted U-shaped traps should be higher than the top copper
pipe of the condenser.
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