Glow-worm Betacom C - Manual (Page 21)

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9 Telescopic Flue - Length, Preparation and Installation
9.1 Flue Length and Restrictors
The maximum permissable horizontal flue length is 2.5 metres
plus the flue terminal assembly, this can be achieved by use
of the accessories, see diagram 9.3.
However should an additional 90º or 2 x 45º elbows be used
then the length MUST be reduced by 1 metre.
The diagram 9.1 shows the length achievable by using the kit
A2043600.
When extension pipes are used the flue system must be
designed to have a continuous fall to the boiler of at least 2.5º
44mm/metre to allow condensate to run back into the boiler
and out via the condensate drain.
The flue can be installed from inside the building, when
access to the outside wall face is not practicable.
The flue restrictor is supplied in the documentation pack, the
correct size is supplied for the boiler output:-
Betacom 24c - 83mmØ
Betacom 30c - 85mmØ
The flue restrictor must be fitted in the flue adaptor for,
concentric flue installations less than 1 metre and twin flue
installations less than 2 metres equivalent length.
Full instructions are provided in the documentation pack.
Horizontal Telescopic Flue
Diagram 9.1
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