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7
Connecting the Drainpipe
3.6
Upflow
Downflow
Connection method
(1) Drainpipe
(Optional) Leakage Test with Nitrogen
3.7
1. Rotate the chilled water valve to the maximum openness (100%).
2. Check that the needle valves and exhaust valves on the pipeline
are closed.
• If the pressure decreases, apply soapy water on the pipes, especially pipe joints to check for
any leakage.
• If the pressure is stable, wrap all pipes and connectors with thermal insulation foam.
• Install a reducing valve at the outlet of the nitrogen cylinder. The outlet pressure of the
reducing valve must be not more than 0.8 MPa.
Downflow
(1) Drainpipe
4. Then, check that the pressure
reading on the pressure gauge
remains unchanged.
3. Connect the reducing valve and nitrogen cylinder to the
following needle valve, inject 0.8 MPa (when the pressure is
stable) nitrogen, and leave them for 24 hours.
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