Bedienungsanleitung Worcester-Bosch Greenstyle Bewdley (Seite 18 von 36) (Englisch)

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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.

Worcester-Bosch Greenstyle Bewdley Seite 18

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