RAIS 500, Owner'S Manual, Page: 13 / 44

M
anual for Rais 500
13
Rais 500 January 2014
Convection
RAIS stoves are convection stoves. This means that the stove’s back and side panels
are not over-heated. Convection means that there is a circulation of air, which ensures
that the heat is distributed more evenly throughout the entire room. The cold air is
drawn in at the base of the stove up through the convection channel, which runs along
the stove’s combustion chamber. The heated air pours out at the top of the stove,
which ensures a circulation of warm air throughout the room.
The stoves are equipped with “cool” door handles – RAIS special feature – which
means you could almost do away with gloves. Be aware, however, that all exterior
surfaces become hot during use - so take extreme care.
Chimney
The chimney is the driving force which makes the stove function. In order for the stove
to perform satisfactorily the chimney height must be sufficient to ensure the correct
draught of 14 to 18 Pa so as to clear the products of combustion and prevent
problems of smoke emanating into the room when firing.
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 BS 5854:1980 may be used as the basis for deciding
whether a particular chimney design will provide sufficient draught.
Please Note, this appliance has been tested by the manufacturers and works on
a 3m straight flue.
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.
Any existing chimney must be clear of obstruction and have been swept clean
immediately before installation of the stove. If the stove is fitted in place of an open fire
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 fire.
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.