Injecting Nitrogen To Preserve The Pressure For Refrigerant Pipes - Huawei FusionCol8000-E240 User Manual

FusionCol8000-E240 Modular Indirect Evaporative
Cooling System
User Manual
Temperatur
e (ºC)
13
14
15
16
17
18

8.5.15.3 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.
Issue 02 (2021-04-15)
Saturation
Pressure –
Gauge
Pressure
(MPa)
1.09
1.12
1.16
1.19
1.23
1.27
NO TICE
Copyright © Huawei Technologies Co., Ltd.
Temperatu Saturation
re (ºC) Pressure –
Gauge
Pressure
(MPa)
32 1.89
33 1.94
34 1.99
35 2.04
36 2.1
37 2.15
8 System Maintenance
Temperatu Saturatio
re (ºC) n
Pressure –
Gauge
Pressure
(MPa)
51 3.04
52 3.11
53 3.19
54 3.26
55 3.34
– –
213