Medium Connections Multi-DENCO
74 FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020
4: To ensure quality of installation, it is highly recommended to conduct a "Tightness
Test". Reduce the pressure in the system to the appropriate Maximum Allowable
Pressure (MAP) for both the low and high pressure sides and observe for 24 hours
(recommended). If site conditions do not permit, we recommend a minimum of 6
hours for the "Tightness Test".
5: If successful, decrease the pressure to 17.2 bar by using the relief valve on the
pressure regulator or manifold. Re-fit the LP switches, open the suction line valve
and complete a bubble test on the LP switch joints.
6: On completion of step 4, reduce the pressure to zero by using the relief valve on the
nitrogen regulator or charging manifold.
7: Repair any leaks that are found and then repeat steps 1 to 5.
8: If the client or end-user requires witnessing the pressure test, carry out this witness
at this point making notes of dates, times and pressures.
9: At the completion of the pressure test, the Oxygen-Free Nitrogen charge should be
safely purged away leaving a holding charge prior to the Evacuation process.
Ensure you have recorded the holding charge in your records at this point.
10:On completion, prepare and sign the 'Pressure Test Certificate' (chapter 13.2).
6.3.3 X-Versions and DENCO-OfficeCool H-Versions
For guidelines on how to perform pressure testing for these installations, please refer
to the separate installation manual.
Some condensing units may be delivered with a 'pre-charge' of refrigerant: ensure this
is not released during pressure testing.
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