5 Before installation
Combi 2
27
A
3
4
5
6
B
3
5
C
3
5
5
5.4.3
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.
Fig.13
Pipework and method of termination
21.5mm
32mm
2
5.4.4
Condensate drain
It is strongly recommended to discharge internally into the
household drainage system. If connecting to a rain water drain, that
drain MUST dis- charge into a foul drain.
1
2
3
4
5
6
7
8
9
10
11
12
Pipework.
Insulation.
50mm per metre of pipe run — 2.5° minimum run.
450mm minimum is applicable to properties up to 3 storeys. For
multi-storey building installations consult BS 6798.
Boiler.
Sink.
Pipe must terminate above water level but below surrounding
surface. Cut end at 45°.
Holes in the soak-away must face away from the building.
500mm
mi
n
imum.
Basement or similar (heated)
Condensate pump
Unheated Location (e.g. Garage)
Tab.18
Examples are shown of the following methods of termination
7
7
8
PN-0000389
D
9
3
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
requirements
for
soakaway design are referred to in BS 6798
E
Pumped into an internal discharge branch (e.g. sink waste)
downstream 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.
