0 site requirement – Baxi Potterton 80 HE User Manual

Page 17

7.0 Site Requirement

7.6

Condensate Drain

FAILURE TO INSTALL THE CONDENSATE
DISCHARGE PIPEWORK CORRECTLY WILL AFFECT
THE RELIABLE OPERATION OF THE BOILER

The condensate discharge pipe MUST NOT RISE at any
point along its length. There MUST be a fall of AT LEAST
2.5° (50mm per metre) along the entire run.

1. The condensate outlet terminates in a 1” BSP nut and seal

for the connection of 21.5mm (

in) plastic overflow pipe

which should generally discharge internally into the household

drainage system. If this is not possible, discharge into an outside

drain is acceptable.

2. Ensure the discharge of condensate complies with any

national or local regulations in force.

BS 6798:2000 & Part H1 of the Building Regulations give

further guidance.

3. The discharge pipe should be run in a proprietary drain pipe

material e.g. PVC, PVC-U, ABS, PVC-C or PP.

4. Metal pipework is NOT suitable for use in condensate

discharge systems.

5. The pipe should be a minimum of 21.5mm diameter and

must be supported using suitably spaced clips to prevent

sagging.

6. Any pipe fitted externally must not exceed 3 metres.

7. Any condensate discharge pipework external to the

building (or in an unheated part of it e.g. garage) must be

insulated to protect against frost. It is also recommended

that the pipe diameter is increased to 32mm.

8. If the boiler is fitted in an unheated location the entire

condensate discharge pipe should be treated as an external

run.

9. In all cases discharge pipe must be installed to aid disposal of

the condensate. To reduce the risk of condensate being

trapped, as few bends and fittings as possible should be used.

10. 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.

Examples are shown of the following methods of termination:-

i) to an internal soil & vent pipe

ii) via an internal discharge branch (e.g. sink waste)

iii) to a drain or gully

iv) to a purpose made soakaway

Boiler

2.5° Minimum fall

Termination to an internal soil and vent pipe

450mm min

Boiler

2.5° Minimum fall

External termination via internal discharge

branch

e.g sink waste - downstream

Sink

Pipe must terminate
above water level but
below surrounding
surface

Boiler

Pipe must terminate above
water level but below
surrounding surface

2.5° Minimum fall

External termination to a drain or gully

Boiler

500mm min

2.5° Minimum fall

External termination to a purpose made soak-away

Holes in the soak-away must
face away from the building

50mm per metre of pipe run