Vacuumizing - Huawei NetCol8000-E220 User Manual

NetCol8000-E220 Modular Indirect Evaporative Cooling
System
User Manual
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3.10 Vacuumizing

Prerequisites
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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 02 (2019-10-10)
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.
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.
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3 Installation Guide
Figure 3-30.
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