Dimplex Westcott 12kW Stove User Manual page 7

If there is no existing chimney then either a prefabricated block
chimney or a twin walled insulated stainless steel flue to BS4543
can be used. These chimneys must be fitted in accordance with
the manufacturers instructions and in compliance with Building
Regulations.
This product must not be installed on a shared flue.
Flue Deposits
If the chimney was previously used as an open fire, it is possible
that the higher flue gas temperatures generated by the stove
may loosen deposits that were previously adhered to the inner
surface of the flue pipe which could cause blockage of the flue
pipe. We recommend that in this situation a second sweeping of
the chimney should be carried out within one month of initial stove
use after installation.
Flue Draught
The chimney should be checked before the stove is installed to
ensure that there is adequate flue pull. The draught can be checked
initially by using a smoke match close to the flue opening. If the
chimney doesn't pull the smoke it may suggest that the chimney
needs further attention. Any remedial work to the chimney flue
should be carried out by a suitably Qualified Engineer.
A flue draught of minimum 12 Pascal to maximum 25 Pascal is
required for satisfactory appliance performance. The flue draught
should be checked under fire at high output and if it exceeds the
recommended maximum a flue draught stabiliser (or flue damper
as it is also known) must be fitted so the rate of burning can be
controlled and prevent overfiring.
Room Ventilation
For safe operation this stove must be provided with combustion
air supply in addition to normal room ventilation, in accordance
with Building Regulations. Minimum ventilation requirements vary
depending on whether the dwelling is considered to be of standard
construction or of airtight construction, or if a flue draught stabiliser
has been fitted. The required open air vent sizes are as follows:
Table 4 - Additional Room Ventilation Required
Standard build dwellings {air permeability >5.0m³ /(h.m²)}
No Flue Stabiliser
With Flue Stabiliser
Airtight build dwellings {air permeability ≤5.0m³ /(h.m²)}
No Flue Stabiliser
With Flue Stabiliser
An extractor fan must not be used in the same room as this
appliance.
Floor Protection & Installation Clearances
In all instances the stove should be positioned on a non-
combustible hearth. The construction of the hearth must conform
to Building Regulations, must be firm, non-combustible and capable
of supporting the stove. Care should be taken to ensure the stove
is level and the hearth is secure. The hearth itself should not be
less than 125mm thick, including the thickness of the floor and
any decorative top surface (e.g. tiling). Allow an apron of at least
300mm at the front of the stove in case of spills when de-ashing.
(Fig 6) shows the minimum distances required from the hearth
edge to the sides of the stove.
40 cm²
76 cm²
67 cm²
104 cm²
- 2 -
The stove can also be recessed in a suitable sized fireplace. We
recommend a permanent free air gap of at least 150mm should
be left around the sides where possible and 300mm around the
top to obtain maximum heat output and for access to the rear of
the stove. Place the product in the desired location on fireproof
hearth taking note of installation clearances from adjacent walls
(Fig 7). Adjust the screws on the bottom of the feet to ensure the
stove is level and steady (see 'A' Fig 2). The stove can be screw
fixed to the floor when placed in the desired position, using the
holes provided in the feet.
Table 5 shows the minimum safe distances to combustable
materials that must be observed. Any surrounding combustible
material should not exceed 80°C.
Table 5
Westcott 12kW
Flue Pipes
The flue pipe used to connect to the stove should be made of cast
iron, 316 grade stainless steel or vitreous enamelled steel, nominal
thickness 1.2mm. The diameter of the flue pipe should be 150mm
(6") for the Westcott 12kW model.
Connect the flue pipe to the stove making sure that it fits snugly
into the base of the flue collar (Fig 5). Seal the collar and flue
connection with fire cement or with other suitable high temperature
sealant. Add flue sections as required; note that all flue sockets
must face upwards. Ensure that the flue pipe end is no closer
than 76mm to the side or rear of the chimney walls. It is essential
that all connections between the stove and the chimney flue are
sealed and made airtight.
Avoid using bends greater than 45° to the vertical (Fig 8). All flue
pipes should be as close to vertical where possible. For rear flue
connection the length of the horizontal run of the flue pipe should
not exceed 150mm (Fig 9). Both chimney and flue pipe must be
accessible for cleaning and if ALL parts of the chimney cannot be
reached, a soot door must be fitted to enable this to be done.
This product should not be installed on a shared flue.
Existing Fireplace
An existing fireplace opening can be bricked up or sealed with a
register plate, 2.5mm sheet steel or concrete. A short length of
flue pipe may then be used to connect the stove to the chimney.
Ideally the old fireplace should be filled in so that there is a smooth
streamlined entry into the flueway. (Fig 9)
Typical installation for Inglenook Fireplaces
Inglenook fireplaces can have very large bore chimneys (Fig 10).
Check with your installer – you may need a stainless steel flexible
flue liner for solid fuel fitting.
Flue Damper (Not Supplied)
When burning wood, a flue damper may be fitted to reduce the
draught through the stove if the draught is too high. When the
damper is set in the open position the chimney draws at full
draught, increasing the volume of air flow through the stove and
flue. Shutting the damper restricts the flow, slowing the rate of
burning. The damper should be fitted to the stove flue and should
be the same size as the flue pipe. As a rule it should be fitted no
closer than 700mm from the flue outlet of the appliance.
A flue damper should not be fitted when burning solid fuels
other than wood.
Sides Rear
600mm 600mm