FläktGroup Multi-DENCO, Operation Manual, Page: 64 / 120

Medium Connections Multi -DENCO
64 FläktGroup DC-2013-0101-GB • Subject to modifications • R4-05/2018
6.5 Connecting condensate drain
The following should be considered during installation:
– Drainpipe runs shall be 22 mm OD or larger of water carrying quality of either copper
or high temperature rigid plastic and should be adequately supported at regular
intervals and have a slope of at least 2 % to ensure drainage.
– If the run is long and has a number of bends, the tube should be adequately sized
and suitable cleaning (rodding) eyes installed at bends.
– If an air handling unit is fitted with a humidifier, drain pipework must be designed as
temperature-proof to withstand up to 100 °C.
– Upon completion of the installation, drain pipework should be leak tested.
– Depending on unit type, condensate traps may be in-built into the unit or the pipe-
work may be provided loose - review unit design before completing installation.
– Condensate trap must be filled with water prior to commissioning and after long inac-
tive periods.
– Electrically conductive drain pipework should be earthed at a point adjacent to the
unit.
Fig. 6-6: Condensate drain
Air handling unit
Drainage
stack
Drip tray
Condensate
humidifer drain
Air break
NOTE!
Some units will have two separate drains to connect (humidifier/condensate).
NOTICE
Local and regional legislation will require a minimum quality standard for drainage.
•
Ensure the drainage system is reviewed during installation and assessed for
possible issues, such as, blockage, overflow, contamination and Legionella.
NOTE!
Direct connection to a waste network is not allowed. Ensure drain has an air break
fitted as shown in Fig. 6-6.