Huawei NetCol8000-A Quick Manual page 16

Nitrogen at the Outdoor Unit Needle Valves
Exhausting
5.6
Exhaust nitrogen from the three needle valves respectively. Do
not remove the needle valve plug in case of loss or damage.
5.7
Welding the Outdoor Unit Ports
5.8
(Optional) Connecting Low Temperature Component Pipes
To outdoor unit gas pipe
To indoor unit
liquid pipe
Thermal insulation foam
5/8 inch liquid pipe
7/8 inch gas pipe
To indoor unit gas pipe
15
Thermal
insulation
foam
7/8 inch gas pipe
To outdoor unit liquid pipe
• When the outdoor is installed vertically,
the gas pipe should be connected to the
top port and liquid pipe should be
connected to the bottom port.
•
A reducing pipe is required when welding
3/4 inch copper pipe to 5/8 inch
connector.
5/8 inch liquid pipe