Specifications

Hercules Boiler Model 5
Chimney
This appliance must not be fitted into a chimney serving another heating appliance.
It is most important that there is no obstruction in the flue or chimney. Please ensure
that any existing chimney is clear of obstruction and swept clean immediately before
installation of the stove. If the chimney has been used for an open fire it is
recommended that it be swept for a second time having been used for a month
following installation. As a closed appliance operates at a higher flue temperature, it
is possible for deposits that were previously adhered, to be dislodged, with the
consequent risk of flue blockage.
Flue Draught
Performance of a flue is dependent on its materials, size and configuration, and the
position of its outlet. In the final design of all these parameters must be considered
to insure that the appliance performs to its full potential. When commissioning, a flue
draught measurement must be taken, if excessive corrective measures must be
implemented. The flue draught is taken when the appliance is running at its working
temperature. Please see data table for correct figures. An excessive flue draught
will potentially damage the appliance, flue and/or the property and void
any warranty.
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. Remedial action should be taken, if required, seeking expert advice, if
necessary. If it is found necessary to line the chimney then a flue liner suitable for
solid fuel must be used in accordance with Building Regulations Approved Document
J.
If there is no existing chimney then either a prefabricated block chimney in
accordance with Building Regulations Approved Document J or a twin walled
insulated stainless steel flue to BS 4543 can be used. These chimneys must be fitted
in accordance with the manufacturer’s instructions and Building Regulations.
The liner diameter must not be less than 7”. If the draw on the chimney is excessive,
a flue draught stabiliser will help to slow this down. An excessive draw may cause
over firing and thus cause the internal components of the stove to wear out quicker..
Any bend in the chimney or connecting fluepipe should not exceed 45°. 90° bends
should not be used. Adequate provision e.g. easily accessible soot door or doors
must be provided for sweeping the chimney and connecting fluepipe.