Technical data

18
7.0 Site Requirements
© Baxi Heating UK Ltd 2014
7.7 Condensate Drain (cont.)
11. When discharging condensate into a soil stack or waste pipe
the effects of existing plumbing must be considered. If soil pipes
or waste pipes are subjected to internal pressure fluctuations
when WC's are flushed or sinks emptied then back-pressure
may force water out of the boiler trap and cause appliance
lockout.
12. A boiler discharge pump is available, ‘MULTIFIT’
part no. 720648301. This pump will dispose of both condensate
& high temperature water from the relief valve. It has a
maximum head of 5 metres. Follow the instructions supplied
with the pump.
13. Condensate Drain Pipe ‘Trace Heating’ Elements are
available in various lengths. ‘MULTIFIT’ part nos.:-
1 metre 720644401
2 metre 720664101
3 metre 720664201
5 metre 720664401*
*Where the drain is between 3 & 5 metres a 5 metre kit can be
used and “doubled back” upon itself.
14. It is possible to fit the element externally on the condensate
drain or internally as detailed in the instructions provided.
15. The fitting of a ‘Trace Heating’ Element is NOT a substitute
for correct installation of the condensate drain. ALL
requirements in this section must still be adhered to.
Boiler
2.5° Minimum fall
iii) Termination to a drain or gully
Boiler
500mm min
2.5° Minimum fall
iv) Termination to a purpose made soakaway
Holes in the soak-away must
face away from the building
50mm per metre of pipe run
50mm per metre of pipe run
Further specific requirements for soakaway
design are referred to in BS 6798.
Pipe must terminate above
water level but below
surrounding surface. Cut
end at 45°
Boiler
vi) pumped into an external soil & vent pipe
2.5° Minimum fall
50mm per metre of pipe run
Condensate Pump
Unheated Location
(e.g. Garage)
Basement or similar
(heated)
Boiler
v) pumped into an internal discharge branch
(e.g. sink waste) downstream of the trap
Pipe must terminate above
water level but below
surrounding surface. Cut
end at 45°
2.5° Minimum fall
50mm per metre of pipe run
Condensate Pump
Sink
Basement or similar
(heated)
Boiler
2.5° Minimum fall
50mm per metre of pipe run
Pipe must terminate above
water level but below
surrounding surface. Cut
end at 45°
The ‘Trace Heating’ element
must be installed in accordance
with the instructions supplied.
External runs & those in
unheated locations still require
insulation.
vii) to a drain or gully with extended
external run & trace heating