Keston K130 Installation And Servicing Instructions page 15

WD52/0/1997
2.8.3 Slope
'Horizontal' flue outlet pipework MUST slope at least 5 degrees (80 mm per metre
run) downwards towards the boiler. Pipework can be vertical. Only swept elbows
can be used.
Air inlet pipework can be truly horizontal or vertical, or sloping in a downward
direction towards the boiler but in this case rain, etc, must be prevented from
entering the pipe. There must be no troughs in any of the pipework, whether
it be air inlet or flue outlet.
Due the low temperature of the flue gases further condensate will form within the
flue system. Drain points, with
suitable traps, must therefore
be incorporated within the flue
system at the base of vertical
flue sections in excess of 2m.
These additional condensate
drains must be run to
discharge as detailed in
section 2.11. Such drain points
can be formed using standard
muPVC fittings. Refer to the
example in Figure 2.8.3.
2.8.4 Terminations
Air inlet terminals must be
facing upwards and positioned
to ensure only fresh air is
drawn into the boiler. The air
terminal must be located
outside of the building.
Drawing of combustion air directly from a ventilated boiler room invalidates the
heat exchanger warranty.
Installation & Servicing Instructions
Chapter 2 - Boiler Connections
FLUE
c
Figure 2.8.2 : Flue & Air Maximum Length Example
The Keston 130 Condensing Boiler
AIR
d
Keston
To Boiler
b
a
Figure 2.8.3 :
Flue Condensate Drain
Point Example
50mm Tee Fitting
6 in min.
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