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15
10. Installation requirements (continued)
1. Internal termination of condensate drainage pipe to
internal stack
2. External termination of condensate drainage pipe via
internal discharge branch (e.g. sink waste) and condensate
siphon
3. External termination of condensate drainage pipe via
internal discharge branch (e.g. sink waste - proprietary fitting).
4. External termination of condensate drainage pipe via
condensate siphon
into a suitable acid resistant pipe - e.g. plastic waste or
overflow pipe. The condensate discharge pipe must have a
minimum diameter of 22mm, must have a continuous fall and
preferably be installed and terminated to prevent freezing.
The discharge pipe must be terminated in a suitable position:
i) Connecting into an internal soil stack (at least 450mm
above the invert of the stack). A trap giving a water seal
of at least 75mm must be incorporated into the pipe run,
there also must be an air break upstream of the trap.
ii) Connecting into the waste system of the building such as
a washing machine or sink trap. The connection must be
upstream of the washing machine/sink. If the connection
is down stream of the waste trap then an additional trap
giving a minimum water seal of 75mm and an air break
must be incorporated in the pipe run, as above.
iii) Terminating into a gully, below the grid level but above
the water level.
iv) Into a soakaway.
N
OTE: If any condensate pipework is to be installed
externally then it should be kept to a minimum and be
insulated with a waterproof insulation and have a continuous
fall. The total length of external pipe used should not exceed
3 metres.
Some examples of the type of condensate terminations can
be found below.
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