Valor 3290 Installation And Servicing - page 4
4
2.3.3.
Precast flue
The appliance can be installed to a fireplace that has
a precast concrete or clay flue block system
conforming to BS1289. The appliance is suitable for
installations conforming to older versions of BS1289
as well as the current edition. The flue blocks must
have a minimum width not less than 63mm and a
cross-sectional area not less than 13,000mm
2
.
Older
editions of BS1289 required a cross-sectional area of
13,000mm
2
. The current revision of the standard
requires 16,500mm
2
. This appliance is suitable in
both cases.
The chimney should be one or two storeys high but
not less than 3m vertical height and be correctly
terminated. No mortar fangs between the blocks
should be extruded into the flueway. If raking blocks
are used, they must be fitted in accordance with the
manufacturer’s instructions. Mortar must not be
allowed to drop down and accumulate in the raked
positions.
The fireplace opening must be within the following
dimensions:
Width: Max.
457mm
Min:
305mm
Height Max:
610mm*
Min.
610mm*
2.3.4.
Metal flue box
The appliance can be installed to a metal flue box
complying with the constructional requirements of
the current edition of BS715.
The opening must be within the following
dimensions:
Width: Max.
457mm
Min:
380mm
Height Max:
610mm*
Min.
510mm
*Though the total height of the closure plate will
accommodate a maximum opening height of
650mm, heights above 610mm will leave the closure
plate and sealing tape visible above the appliance.
2.3.
Flues
Suitable flues are:
a) 225mm x 225mm conventional brick flue. If a
liner is used, it must be a minimum of 127mm
(5in.) diameter. The liner must be sealed to the
surrounding area above the fireplace opening and
to the top of the chimney and have an approved
terminal.
b) A properly constructed precast flue conforming
to BS1289 (See section.2.3.3.)
c) A flue pipe with a minimum diameter of 127mm
(5in.). See BS6461 Part 1 for suitable materials.
Metal flue pipes must comply with BS715. See
section 2.3.4. for metal flue box requirements.
2.3.1.
The flue must have a minimum equivalent height of
3m.
2.3.2.
The flue must serve only one fireplace.
2.3.3.
Any damper or register plate should be removed. If
removal is not possible without carrying out
structural work, the damper or plate may be left in
the flue provided that it is permanently secured in the fully
open position.
2.3.4.
If the appliance is intended to be installed to a
chimney which was previously used for solid fuel,
the flue must be swept clean prior to installation. All
flues should be inspected for soundness and freedom
from blockages.
2.4
If the fireplace opening is an underfloor draught
type, it must be sealed to stop any draughts.
2.5.
The flue spigot and any spigot extension must be
capable of passing through the closure plate by at
least 25mm with a minimum clearance of 50mm
between its open end and the nearest obstruction.
There must be a minimum clearance of 165mm
between the back of the closure plate and the back of
the catchment space.
The catchment space below the flue spigot must
extend at least 250mm downwards measured from
the bottom of the flue spigot. See figure 2.
2.6.
The front face of the fireplace should be reasonably
flat to ensure that a good seal can be made with the
closure plate.
2.7.
The minimum clearance from the top surface of the
appliance to the underside of any shelf made from
wood or other combustible materials is as follows:-
• For a shelf up to 150mm deep
Minimum height = 203mm
• For a shelf deeper than 150mm
203mm + 12.5mm for every 25mm depth over
150mm.
2.8.
The minimum allowable distance to a corner wall or
other projection at either side which extends further
forward than the front of the appliance is 100mm.
2.9
The space between the back of the outer case and the
front face of the fireplace must not be filled in. Note:
The Valor decorative cover plate is suitable for use.
2.10.
Note that soft wall coverings (e.g. embossed vinyl,
etc.) are easily affected by heat. They may scorch or
become discoloured when close to a heating
appliance. Please bear this in mind when installing.
2.11.
An extractor fan may only be used in the same room
as this appliance, or in any area from which
ventilation for the appliance is taken, if it does not
Figure 2