Section 4 – Installation
4.3.1 Air infiltration and Infiltration of sewer gases
Any air infiltration into the ventilation unit via the condensate hose must be prevented.
Both condensate hoses must be looped and inclined as shown in Fig 4.3 in order to trap a loop of water and
prevent air getting back into the unit via the hoses.
(1 metre length of hose is supplied with each unit).
The hoses must go via a funnel or tundish to a suitable water trap as shown below.
The condensate hoses from the ventilation unit must not be connected directly to the drainage pipe.
Fig. 4.3 Condensate drain connection (schematic)
NOTE!
Both condensate hoses MUST be made, and
separately run to their own drain connection.
DO NOT “common up” the two hoses.
1 Ventilation unit
2 Looped to act as a condensate trap
3 Condensate line with downward gradient
4 Funnel or tundish to provide air gap
5 Water trap to prevent bad odours entering the
room
6 Drainage line with min. 2% downward gradient
NOTE!
Pre-fill water traps or installed hose bends after completion.
NOTE!
Ensure that the condensate hoses are sufficiently inclined! Incorrect installation can cause water
damage!
NOTE!
The condensate hoses must be checked and cleaned regularly, at least annually!
4.4 Air duct system
The connection nozzles for the air duct system are on the top side of the unit in the vertical direction.
Fig. 4.4a Natural Air 180 Air duct connections
Fig. 4.4b Natural Air 350 Air duct connections
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