5.3.3 Ventilation
Where the appliance is installed in a cupboard or compartment, no air
vents are required. BS 5440: Part 2 refers to room sealed appliances
installed in compartments. The appliance will run sufficiently cool without
ventilation.
5.3.4 Condensate drain
It is strongly recommended to discharge internally into the household
drainage system. If connecting to a rain water drain, that drain MUST
discharge into a foul drain.
1
Pipework.
2
Insulation.
3
50mm per metre of pipe run — 2.5° minimum run.
4
450mm minimum is applicable to properties up to 3 storeys. For
multi-storey building installations consult BS 6798.
5
Boiler.
6
Sink.
7
Pipe must terminate above water level but below surrounding
surface. Cut end at 45°.
8
Holes in the soak-away must face away from the building.
9
500mm mimimum.
10
Basement or similar (heated)
11
Condensate pump
12
Unheated Location (e.g. Garage)
Tab.17 Examples are shown of the following methods of termination
Key Description
A Termination to an internal soil and vent pipe.
B External termination via internal discharge branch e.g. sink waste
— downstream (It is NOT RECOMMENDED to connect upstream
of the sink or other waste water receptacle!)
C Termination to a drain or gully.
D Termination to a purpose made soakaway Further specific re
quirements for soakaway design are referred to in BS 6798
E Pumped into an internal discharge branch (e.g. sink waste) down
stream of the trap.
F Pumped into an external soil and vent pipe.
G Termination to a drain or gully with extended external run and
trace heating. The "Trace Heating" element must be installed in
accordance with the instructions supplied. External runs and
those in unheated locations still require insulation.
Fig.14 Pipework and method of termination
PN-0000389
A
B
C
D
3
3
3
3
4
6
5
5
5
5
7
7
8
9
21.5mm
32mm
2
5 Before installation
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