Atmos Energy INTERCOMBI HE32 - Manual (Page 19)

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4.8 Condensate disposal
The appliance is provided with a 25 mm flexible pipe from its
condensate trap. As given in §4.6, 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 soakaway
The pipework must incorporate a minimum fall of 2.5 degrees (or
44mm/metre) towards its point of termination. The condensate
pipework external to the property, or in an unheated part (eg a
garage), must be suitably insulated to protect against freezing, and the
length of the external pipe restricted to a maximum of 3 metre.
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 soakaway is used, install at least 1 metre away from
the external wall and clear of foundations and services. The soakaway
is buried in the ground and surrounded by limestone chippings to
neutralise the condensate.