Part No. 5106463
17
Fig. 11
Internal Flues
The exposed flue pipe between the boiler flue off-take
and the chimney proper (either internally or externally)
must not be of asbestos. Vitreous Cast Iron, Steel or
similar materials should be used.
Note: When installing the boiler into a chimney
previously fitted with a liner, the liner must be replaced
and made weather-tight.
Choice of Materials
The materials used in the construction of chimneys
and flues must always be suitable for the application.
Their construction must be durable, non-combustible,
able to resist the range of temperatures expected; and
also resistant to external as well as internal corrosion.
This is particularly important due to the Statesman's
high thermal efficiency, where correct choice of
materials will prevent problems likely to be caused by
condensation.
If you are in any doubt, you should seek advice of a
reputable manufacturer of chimneys, names should
be available from your local stockist.
Combustion & Ventilation Air for Open Flue Oil Fired
Boilers
General. A sufficient permanent air supply to an
appliance will be required.
a) For proper combustion of fuel and effective
discharge of combustion products to the open air.
b) For the ventilation of any confined space in which
an appliance is installed to prevent overheating of
the appliance and any equipment in and near the
appliance.
c) For the satisfactory operation of any draught break
or stabilizer which may be fitted.
Air for Combustion
This requirement will be satisfied if the room or space
in which the appliance is installed has an opening or
duct which is designed to allow the passage of air at
all times equivalent, in total free area, to 550 mm
2
/kW
(2.5 in
2
per 10,000 btu’s) of the appliance rating.
If the space containing the appliance has an extract
ventilation fan fitted, the supply of air should be such
that the operation of the appliance and flue is
unaffected when the windows and doors are closed
and the extractor fan is running.
Air for Ventilation
For an appliance in a confined space, care shall be
taken to provide air for ventilation. A working guide to
the minimum free area of openings to be provided in
addition to that for combustion air is as follows:
a) Where the air is taken from a heated space, 1100
mm
2
/kW at high level and 1100 mm
2
/kW (5.0 ins
2
per 10,000 Btu’s) at low level.
b) Where the air is taken from outside, 550 mm
2
/kW
at both high level and low level (2.5 in
2
per 10,000
btu’s) at low level.
The above requirements are essential, in particular
for appliances which are installed with a low level
discharge. The warranty for such boilers could be
affected if proper free air requirements are not
provided.
FREE AREAS OF GRILLES ARE MM
2
PER KW
OF APPLIANCE RATING (OUTPUT)
Pre-Installation Requirements
