Baxi MULTI-HEAT - Chimney Connection

The boiler must be placed in a boiler room with an un-blockable, significant supply of fresh air. The size
of the air-intake must correspond to the chimney's diameter, however at least 0.02 m
2
.
If the boiler is placed in a room from which there is direct access to the inhabited rooms, so that flue gas
can easily penetrate into these rooms, a carbon monoxide alarm must be fitted which can give a warning
regarding possible escapes of carbon monoxide into the inhabited rooms.
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3.3 Chimney connection
The boiler flue for the chimney must be placed on the exterior of the boiler's smoke stub and a boiler flue
with an internal dimension of 130 or 150 mm respectively is used - see technical data.
As the boiler has a built-in blower, there are only small demands made on the chimney draft.
The dimensions for the diameter and height must comply with the Building Regulations.
The chimney draft must be at least 10 Pascal and max. 25 Pascal.
Excessively high chimney draft can be reduced by means of a draft stabiliser.
Chimney draft for high draft stabiliser
Strong directional wind or a very high chimney can cause excessive draft. The solution is to build in a
draft stabiliser so that the chimney can be limited to 10-25 Pascal.
An appropriate and stable chimney draft also reduces the risk of back-burning in the magazine.
Please consult your chimney sweep before building in a draft stabiliser.
A draft stabiliser can be bought from BAXI as an accessory (see figure below – secure draft stabiliser in
appropriate material with external bearings with good accuracy of adjustment).
The draft stabiliser can be built in, in positions 1, 2 or 3 (see sketch at bottom left).