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FusionCol8000-E400 Modular Indirect Evaporative
Cooling System
User Manual
9.6.4 Leakage Test with Nitrogen for Refrigerant Pipes
Prerequisites
● Refrigerant pipes have been welded.
● All needle valve plugs must be present.
● 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 an air-cooled outdoor unit or a water cooling module is connected to the
outdoor side, perform the same operations on the refrigerant side for nitrogen
injection and pressure preservation.
Procedure
Step 1 Inject nitrogen from the low-pressure needle valve and discharge pipe needle
valve at the same time.
The outlet pressure of the reducing valve should be within 3.0 MPa; otherwise,
components may be damaged.
Step 2 Open the pressure gauges and reducing valve. Inject 3.0 MPa nitrogen and
preserve the pressure for 24 hours. The system pressure should stay constant
under unchanging ambient temperature conditions. If there is considerable
temperature change, perform the test again.
The outlet pressure of the reducing valve should be within 3.0 MPa; otherwise,
components may be damaged.
Step 3 If the pressure decreases, apply soapy water or use a halogen leak detector to
check for any leakage. If the pressure is stable, expel the nitrogen.
----End
Issue 04 (2022-06-30)
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