Optional) Vacuumizing - Huawei NetCol8000-E220 User Manual

NetCol8000-E220 Modular Indirect Evaporative
Cooling System
User Manual
(3) Water refill pipe (4) Drainpipe (The end needs to be connected to the utility drainpipes.)
(5) Soil
Figure 3-29 Requirements for wrapping the electric heating belt
● The electric heating belt needs to be wrapped around the drainpipe and water
refill pipe evenly during onsite installation.
● Wrap the electric heating belt before wrapping the thermal insulation foam.
Ensure that the thermal insulation foam covers the electric heating belt. The
thermal insulation foam must be able to withstand a temperature higher than
200°C.

3.10 (Optional) Vacuumizing

Prerequisites
● The NetCol8000 is a dual system, and vacuumizing should be carried out one
by one or simultaneously. The following figure uses one system as an example.
● Before vacuumizing the cooling system, ensure that the refrigerant pipes have
passed the air tightness test and do not leak.
● Before vacuumizing the cooling system, ensure that all connectors are secured.
● System high pressure may occur if the cooling system is not vacuumized or is
not thoroughly vacuumized. Ensure that the cooling system is thoroughly
vacuumized before refrigerant is charged.
Procedure
Step 1 Connect the pressure gauge and vacuum pump at two positions, for example, the
low-pressure needle valve and liquid pipe needle valve, and start vacuumizing, as
shown in
Issue 06 (2020-08-19)
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Figure 3-30.
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