9 Safety Discharge Valve & Condensate Connections
Diagram 9.1
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Diagram 9.2
9.1 Safety Discharge Valve
Take the safety discharge pipe, supplied in the pipe pack and
the union nut and seal, supplied in the loose items pack and
t as shown in diagram 9.1.
This must be extended, using not less than 15mm o.d. pipe,
to discharge, in a visible position, outside the building, facing
downwards, preferably over a drain.
To ease future servicing it is advisable to use a compression
type tting to extend the safety discharge valve tube.
The pipe must have a continuous fall and be routed to a
position so that any discharge of water, possibly boiling,
or steam cannot create any danger to persons, damage to
property or external electrical components and wiring.
9.2 Condensate Trap and Siphonic Drain
Connection
A exible condensate outlet pipe is tted and should be used
to couple the condensate trap and siphonic drain to a 22mm
to 25mm O.D. non corrosive plastic pipe (overow pipe), see
diagram 9.2.
IMPORTANT: Please remove the bung from the exible pipe
before tting to a drain outlet pipe.
NOTE: the pipe should have a fall of a least 2.5
O
44mm/metre
away from the boiler.
Condensate should, if possible be discharged into the
household internal drainage system. If this is not practicable,
discharge can be allowed into the external household drains
or a purpose designed soak away, refer to diagram 9.3.
It is recommended that any external condensate drain pipe is
protected and also preferably of 32mm diameter, to prevent
freezing in adverse weather conditions.
The condensate is discharged periodically in ‘slugs’ by
siphonic action.
It is not necessary to provide air breaks or extra traps in the
discharge pipe as there is already a 75mm high trap inside
the boiler. Fitting an extra trap may cause the boiler siphon to
work incorrectly.
Refer to BS5546 or BS6798 for advice on disposal of boiler
condensate.
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