Product specifications

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4.9 Condensate disposal
The appliance is provided with a 25 mm flexible pipe from its
condensate trap. As given in §4.7, this should be inserted into an open
waste pipe of not less than 32 mm diameter, together with the safety
discharge pipe. The condensate is slightly acidic (pH between 3 and
6) and should be disposed of in the following ways, using suitable
plastic waste pipe (Note: copper or steel must not be used):-
• internal stack pipe (see diagram)
• waste pipe (see diagrams)
• external drain or gulley
• purpose made soak-away
The pipe work must incorporate a minimum fall of 2.5 degrees (or
44mm/metre) towards its point of termination. Condensate pipe work
external to the property, or in an unheated space (eg a garage), must
be protected against freezing through the use of pipe insulation and
trace heating. Atmos can supply trace heating.
If an external drain or gulley is used, then the open end of the pipe
should be terminated below the grid level, but above the water level.
If a proprietary soak-away is used, install at least 1 metre away from
the external wall and clear of foundations and services. The soak-
away is buried in the ground and surrounded by limestone chippings
to neutralise the condensate.