Multi-DENCO Medium Connections
FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020 77
6.6 Connecting water pipework
6.6.1 Water pipes material quality
For water pipework:
– Copper tube quality must be the equivalent of EN 1057
– Pipework must be cleaned and dehydrated
– Use of joints, bends or sets must be kept to a minimum
– Bends or sets are to be machine pulled to approved radius at all times
– Only properly swaged joints can be used (butt joints are not allowed)
– Manufactured bends are not recommended
– It is recommended to use half-hard straight lengths of copper instead of coils.
6.6.2 Sizing
Pipe sizing for Water connection C, W, P version with outdoor unit
– When connecting:
– The entire chilled water circuit must be designed and installed to national and local
standards and regulations.
– Piping and pump(s) must be properly sized to meet the design volume flow. Non-
compliance can cause operational malfunctions.
– All chilled water and dry-cooler water pipework must be vapour sealed and insulated
to avoid condensation and capacity losses. The exterior surface of steel piping must
be protected against corrosion using protective paint.
– Hydraulic devices such as modulating valves or hand shut off valves may cause
hydraulic hammer. This condition should be avoided.
– Beware of any residual glycol solution that may be left in the hydraulic circuit follow-
ing testing. Residual glycol solution must be disposed of in an environmentally-
friendly manner.
NOTE!
Prior to installation it is particularly important to check the correct size water pipe-
work is being installed. Contact your local representative if you are unsure.
NOTE!
Only the pipe sizes listed below are ALLOWABLE for each size. ONLY these sizes
MUST be used for both horizontal and vertical risers. This table is for REFERENCE
ONLY. It is recommended use same dimension of pipework as it is in main unit.
NOTE!
FINAL and ULTIMATE responsibility for pipe sizing is of the contractor or installer.
The below table is for GUIDANCE ONLY. It is necessary that suitably qualified engi-
neers conduct their own, separate calculations to determine the sizing suitable for
the application.
Unit size C-Version W-Version P-Version
010 22 mm 28 mm --
018 28 mm 35 mm --
030 35 mm 42 mm 42 mm
045 42 mm 54 mm 54 mm
065 54 mm 54 mm 54 mm
092 54 mm 67 mm --
130 67 mm 67 mm --
Tab. 6-8
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