Baxi Potterton BBU 15 HE - Manual (Page 18)

5.0 Site Requirements
18
© Baxi Heating UK Ltd 2009
5.9 Condensate Drain - General
Failure to install the condensate discharge pipework
correctly will affect the reliable operation of the boiler.
1. Ensure the discharge of condensate complies with any
national or local regulations in force.
BS 6798 & Part H1 of the Building Regulations give further
guidance.
2. If any further drain pipe is required (additional to that supplied
with the boiler), it should be run in a proprietary material
e.g. PVC, PVC-U, ABS, PVC-C or PP. John Guest ‘Speedfit’
components are recommended.
3. Metal pipework is NOT suitable for use in condensate
discharge systems.
4. Any pipe fitted externally must be kept as short as possible to
minimise the potential of freezing and must be insulated using
waterproof material.
5. When discharging condensate into a soil stack or waste pipe
the effects of existing plumbing must be considered.
5.10 Condensate Disposal (Fig. 12)
1. This boiler incorporates an automatic pumped condensate
system. The pump is submerged in a sump assembly and is
activated by the discharge float switch. A second (safety) float
switch is fitted.
2. The pump has an effective head of 3.5 metres. The
condensate outlet is positioned at the top right front of the
boiler. It is 10mm diameter plastic.
3. 3.5 metres of flexible 10mm condensate discharge pipe and a
10mm push fit elbow are supplied with the boiler.
4. The 10mm pipe can be routed to a maximum of 3.5 metres
vertically and then discharge via gravity or be routed
horizontally. A combination of vertical and horizontal runs is
permissible.
5. The pipe must be adequately supported, either using suitably
spaced clips or run within larger diameter pipe. When using clips
take care not to deform the pipe.
6. When routing the pipe through a wall it must be suitably
sleeved. Also the pipe must not be exposed to sources of heat,
and should be protected in locations where it may be damaged.
7. The pipe should be routed so that any sharp bends, dips and
loops are avoided. A minimum radius of 100mm is
recommended for any bends. No slope is necessary and air
breaks are not required on the pumped part of the condensate
run.
8. Any part of the condensate drain system that is outside the
dwelling, or in an unheated part of it must be at least 21.5mm
diameter.
Boiler
Max. Head
3.5 metres
Gravity Drain
min. fall 3°
Min. radius 100mm
Note: The point of discharge from the
pumped length of condensate pipe
(point ‘A’) must be 150mm above the
base level of the boiler, whether
discharging direct into a drain or into
an additional gravity drain.
Point ‘A’
Fig. 12