Huawei NetCol8000-A Quick Manual page 12

Interface dimensions (unit: mm)
Model
NetCol500-A060 (52273539, 52273539-005)
NetCol500-A060 (52273539-006)
NetCol500-A080
NetCol500-A120
5
Welding Refrigerant Pipes
Laying the Engineering Pipe
5.1
• When outdoor unit is installed horizontally, the outdoor unit and the low-temperature
component must be at the same horizontal plane. When outdoor unit is installed vertically,
the installing horizontal plane of outdoor unit must not be lower than the installing horizontal
plane of low-temperature component, and the height difference cannot exceed 1.5 m.
• Typically, the pipe length is less than or equal to 100 m.
• When calculating the height difference, the compressor base is regarded as the baseline for
the indoor unit, and the condenser top is regarded as the baseline for the outdoor unit.
• When the outdoor unit is higher than the indoor unit, the maximum height difference is 8 m.
When the outdoor unit is lower than the indoor unit, the maximum height difference is 30 m.
• An inverted U-shaped trap should be added if the indoor unit is higher than the outdoor unit.
An oil trap should be installed every 5 m to 6 m in the vertical direction along the gas pipe to
ensure system reliability.
• The inverted trap should be higher than the top copper pipe of the condenser.
• 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.
A B C
1287 1257 387
1290 1260 447
2117 2087 387
2259 2229 387
11
D E F
478 1037 1126
538 978 1066
478 1742 1830
478 1217 2100