Injecting Nitrogen To Preserve The Pressure For Refrigerant Pipes - Huawei FusionCol8000-E240 User Manual
Modular indirect evaporative cooling system
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FusionCol8000-E240 Modular Indirect Evaporative
Cooling System
User Manual
8.4.13.3 Injecting Nitrogen to Preserve the Pressure for Refrigerant Pipes
Prerequisites
● Refrigerant pipes have been welded.
● All needle valve plugs must be available.
● The measuring range of a pressure gauge must be at least 4.0 MPa, and the
rubber hose must withstand a pressure of at least 4.5 MPa.
● Only nitrogen can be used for pressure preservation and leakage detection.
● During pressure preservation, do not remove the rubber hoses and pressure
gauges; otherwise, nitrogen may leak.
● When the outdoor unit is connected to an air-cooled outdoor unit or water-
cooled module, the nitrogen injection and pressure preservation operations on
the refrigerant side are the same.
Procedure
Step 1 Inject nitrogen from the low-pressure needle valve and liquid pipe needle valve at
the same time.
Figure 8-23 Injecting nitrogen to preserve the pressure
(1) Nitrogen cylinder
(4) High pressure gauge
The outlet pressure of the reducing valve should be within 3.0 MPa; otherwise,
components may be damaged.
Issue 01 (2021-01-30)
NO TICE
NO TICE
Copyright © Huawei Technologies Co., Ltd.
(2) Reducing valve
(5) Low pressure needle valve
8 System Maintenance
(3) Low pressure gauge
(6) Liquid pipe needle valve
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