FläktGroup Multi-DENCO, Operation Manual

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Multi -DENCO Medium Connections
FläktGroup DC-2013-0101-GB • Subject to modifications • R4-05/2018 59
If the condenser(s) are installed ABOVE the Multi -DENCO unit, for the discharge line:
– The condenser must be NO MORE than 35 m above the Multi -DENCO unit
– 'P' traps must be installed at the bottom of EVERY vertical riser in the discharge line,
including pipework outside of riser cupboards (Detail 1)
– For every max. 5 m of vertical pipework, and 'S' trap must be installed (Detail 2)
– At the top of every riser a bend should be used to prevent oil return (Detail 3)
– Use a 1% slope in the direction of refrigerant flow (Detail 3 & 4)
When the condenser is located BELOW the Multi -DENCO unit, oil traps are not requi-
red. Consideration must be given to ensure that the liquid line pressure losses are not
excessive (see chapter 6.2.3 'Sizing' for more information).
6.2.10 Tube support (clamping)
It is recommended:
– All tubing should be independently clamped in position using a cushion based
vibration absorption clamps
– Supports should be spaced at no more than 1.5m separation
– A thermal break should be provided between suction pipes and any
support brackets
6.2.11 Fan removal to aid installation
On certain downflow units, access to the refrigeration pipework connections can be dif-
ficult (especially if there is no side access to the unit).
Multi -DENCO units are designed
to allow for the removal of fan closest to the pipework to make installation easier.
Fig. 6-5
NOTICE
Failure to install sufficient oil traps can cause a lack of lubrication in a compressor
resulting in poor performance or failure.
The last trap (detail 3 in Fig. 6-4) prevents liquid refrigerant travelling backwards
to the compressor outlet.
•
Ensure suitable oil traps are installed as per Fig. 6-4.
NOTE – LABELLING OF ELECTRICAL WIRES!
It is very important to observe and label any electrical wires for the fan being remo-
ved to ensure a correct re-installation.