Technical data

20
© Baxi Heating UK Ltd 2014
5.0 Site Requirements
5.11 Condensate Disposal Pipe Runs (cont.)
Underfloor Runs
10. On installations where the discharge pipe is routed lower
than the outlet connection Point ‘X’ must always be at least
150mm above the baseline of the boiler (Fig. 17).
11. Once larger diameter pipe is used smaller pipe must not
be fitted further downstream.
12. There must be no air breaks within the dwelling !
13. When calculating the vertical run* it is necessary to include
the 0.5m from the pump to the boiler outlet. To this add the
distance from the lowest point on the discharge pipe to the
base level of the boiler (Dimension Y). Then add the height of
discharge pipe from the boiler base level to Point X (i.e. the
point at which the condensate is removed by gravity). This
must be a MINIMUM of 150mm.
Maximum Vertical Run* (m)
Maximum Horizontal Run (m)
Maximum No. of 90° Elbows
2.5
8.0
4
2.0
8.5
5
1.5
9.0
6
1.0
9.5
7
0.5
10.0
8
Point X
150mm MIN.
Dimension Y
0.5m
Boiler
Outside to
Drain
Minimum
fall 3°
Boiler Base
Transition from 10mm
to 21.5mm then 32mm
for External Run
nal Pipe MUST be
Insulated
Pipe in Unheated Area
(i.e. Underfloor) MUST be
Insulated
Fig. 17
{
10mm pipe
supplied with
boiler