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Worcester-Bosch Greenstyle Bewdley Manual

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INSTALLATION
18 6720818040 C 11/2017
CHIMNEY
In order for the stove to perform satisfactorily the chimney height must
be sufcient to ensure an adequate draught of approximately 15 Pa
when hot so as to clear the products of combustion and prevent smoke
problems into the room.
NOTE: A chimney height of not less than 4.5 metres measured
vertically from the outlet of the stove to the top of the chimney should
be satisfactory. Alternatively the calculation procedure given in EN
13384-1 may be used as the basis for deciding whether a particular
chimney design will provide sufcient draught. BS EN 15287-1:2007
gives additional details.
The outlet from the chimney should be above the roof of the building
in accordance with the provisions of Building Regulations Approved
Document J.
If installation is into an existing chimney then it must be sound and have
no cracks or other faults which might allow fumes into the house. Older
properties, especially, may have chimney faults or the cross section may
be too large i.e. more than 230 mm x 230 mm. Should remedial action
be required, expert advice should be sought. If it is found necessary to
line the chimney then a ue liner suitable for solid fuel must be used in
accordance with Building Regulations Approved Document J.
Any existing chimney must be clear of obstruction and have been swept
clean immediately before installation of the stove. If the stove is tted in
place of an open re then the chimney should be swept one month after
installation to clear any soot falls which may have occurred due to the
difference in combustion between the stove and the open re.
If there is no existing chimney then any new system must be to
the designation described above and in accordance with Building
Regulations Approved Document J.
A single wall metal uepipe is suitable for connecting the stove to
the chimney but is not suitable for use as the complete chimney. The
chimney and connecting uepipe must have a minimum diameter of
125mm for Bewdley 3 & 5, 150mm for Bewdley 8, and its dimension
should be not less than the size of the outlet socket of the stove.
Any bend in the chimney or connecting uepipe should not exceed 45°,
90° bends should not be used.
Combustible material should not be located where the heat dissipating
through the walls of replaces or ues could ignite it. Therefore when
installing the stove in the presence of combustible materials due
account must be taken of the guidance on the separation of combustible
material given in Building Regulations Approved Document J and also
in these stove instructions.
If it is found that there is excessive draught in the chimney then a
draught stabilizer should be tted. Fitting of a draught stabiliser will
affect the requirement for the permanent air supply into the room in
which the stove is tted in accordance with Approved Document J (see
also combustion air supply).
Adequate provision e.g. easily accessible soot door or doors must be
provided for sweeping the chimney and connecting uepipe where it is
not intended for the chimney to be swept through the appliance.
This stove may be connected with a factory built or masonry chimney
with a minimum diameter of 125mm Bewdley 3 & 5, and 150mm
Bewdley 8. If you are using a factory built chimney, it must comply with
BS EN 1856-1:2003 standard. It is very important that it is installed
according to the manufacturer’s specications.
If you are using a masonry chimney, it is important that it be built in
compliance with the specications contained in Document J.
The interior diameter of the chimney ue must be no smaller than the
diameter of the stove smoke exhaust pipe. A ue which is too small
may cause draught problems, while a large ue promotes rapid cooling
of the gas, and hence the build-up of creosote and the risk of chimney
res. Note that it is the chimney and not the stove which creates the
draught effect; the stove’s performance is directly dependent on an
adequate draught from the chimney.
Installation of an interior chimney is always preferable to an exterior
chimney. Indeed, the interior chimney will, by denition, be hotter than
an exterior chimney, being heated up by the ambient air in the house.
Therefore the gas which circulates will cool more slowly, thus reducing
the build-up of creosote and the risk of chimney res. The draught
caused by the tendency for hot air to rise will be increased with an
interior chimney.
Using a chimney cap at the extremity of the chimney requires regular
inspection in order to ensure that it is not obstructed thus blocking
the draught, and it should be cleaned when used regularly. Exterior
chimney should be double or triple wall.
CONNECTION TO CHIMNEY
Stoves may have a choice of either a rear or top ue gas connector
that allows connection to either a masonry chimney or a prefabricated
factory-made insulated metal chimney in accordance with their
instructions.
REGULAR CLEANING
It is important that the appliance, ue gas connector and chimney are
regularly cleaned and checked for any possible blockages prior to re-
lighting after a prolonged shut down.
… 18 …


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