● Exercise caution during welding. It is recommended that you use metal plates
to isolate the welding source from devices in the cabinet to avoid burning the
devices, such as rubber rings and thermal insulation foam.
● Use a rubber hose to connect the nitrogen cylinder which connecting the
reducing valve and the end of the copper pipe, then
ll nitrogen at 0.03–0.05
MPa into the copper pipe to avoid internal oxidation, as shown in Figure 4-61.
● When welding a gas pipe, gently inject nitrogen into the pipe through the
exhaust pipe needle valve.
● When welding a liquid pipe, gently inject nitrogen into the pipe through the
liquid pipe needle valve.
Figure 4-61 Welding pipes
Step 2 (Applicable to downow units) Cut a cross in the rubber ring using a utility knife
and route the pipe wrapped with the thermal insulation foam through the hole.
Ensure that the rubber ring is not disconnected. If the rubber ring is disconnected
or damaged, seal the gaps around the pipes with mastic cement or thermal
insulation foam.
Step 3 Connect the gas and liquid pipes to the gas and liquid pipes of the outdoor unit
respectively.
Step 4 Wrap the thermal insulation foam.
----End
Side Pipe Routing
Step 1 Remove the plugs from the bottom refrigerant pipe using a welding torque.
NetCol8000-A(045, 055, 060, 090, 120) In-room Air
Cooled Smart Cooling Product
User Manual 4 System Installation
Issue 05 (2020-10-10) Copyright © Huawei Technologies Co., Ltd. 103
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