HAMWORTHY HEATING LTD
8
WESSEX 100 M
500001080/F
6.9 Condensate Discharge
Due to the high thermal efficiency of the boiler,
condensation will occur within the boiler casing
during firing from cold conditions. A drain with an
integral trap is fitted to the rear centre of the
appliance base tray to enable disposal of the
condensate. Connection to the trap is Rp½. The
drainpipe must be manufactured from a non-
corrosive material and be at least 15.0mm dia. It
must also have a fall of at least 3° (approx. 50mm
per metre) and connect directly to a drain.
In addition to the above the M200 and M300 flue
boxes are provided with a 22 dia drain stub pipe
which should be connected in a similar manner via a
suitable trap.
7.0
AIR SUPPLY
Detailed recommendations for air supply are given
in
BS 6644
. The following notes are intended to give
general guidance. In all cases there must be
provision for an adequate supply of air for both
combustion and general ventilation, in addition to
that required for any other appliance.
Note:
Combustion air for the appliance is drawn
through the pyramid shaped air inlet located on the
top cover. It
must
be ensured that this air inlet is
kept open and free from blockage at all times.
7.1
Air Supply by Natural Ventilation
The boiler room must have, or be provided with,
permanent air vents directly to the outside air, at
high level and at low level. For an exposed boiler
house, air vents should be fitted preferably on all
four sides, but at least on two sides. Air vents
should have negligible resistance and must not be
sited in any position where they are likely to be
easily blocked or flooded or in any position adjacent
to an extraction system which is carrying flammable
vapour. Grilles or louvres must be so designed that
high velocity air streams do not occur within the
space housing the boiler.
The air supplied for boiler house ventilation shall be
such that the maximum temperatures within the
boiler house shall be as follows:
1) At floor level (or 100mm above) = 25°C.
2) At mid-level (1.5m above floor level) = 32°C.
3) At ceiling level (or 100mm below) = 40°C.
Where both low and high level openings are used,
the grilles shall have a total minimum free area of: -
Low Level (inlet): 540cm² plus 4.5cm² per Kilowatt in
excess of 60kW total rated input.
High Level (outlet): 270cm² plus 2.25cm² per
Kilowatt in excess of 60kW total rated input.
6.4 Suction
The flue system should be designed to maintain
atmospheric pressure or a slight suction at the boiler
flue connection at all times (0.08 - 0.10 mbar).
It is recommended that a draught stabiliser is fitted
to the flue system where the suction is likely to
exceed 0.1mbar or the height of the flue exceeds
4metres.
6.5
Disconnection
Provisions should be made for disconnection of the
flue pipe for servicing. It is advisable that bends are
fitted with removable covers for inspection and
cleaning as appropriate.
NOTE!
The flue system
must be self supporting and not present a risk to
people in or around the building.
See
Section 13:
SERVICING
(p20) for further
information
.
6.6 Flue Discharge
The flue system must ensure safe and efficient
operation of the boiler to which it is attached, protect
the combustion process from wind effects and
disperse the products of combustion to the external
air.
The flue must terminate in a freely exposed position
and be so situated as to prevent the products of
combustion entering any opening in a building.
Where the flue diameter is less than 204mm (8") a
terminal must be fitted. Where the flue is of a larger
size consideration should be given to the fitting of a
flue discharge terminal or grill to stop ingress of
birds etc.
6.7
Surface Temperatures
Combustible materials in the vicinity of the boiler and
flue shall not exceed 65°C during boiler operation.
The flue shall not be closer than 50mm to any
combustible material, except where it passes
through such material with a non-combustible sleeve
when the air gap may not be less than 25mm.
6.8 Flue System Location
The flue system must not be placed or fitted where
there is undue risk of accidental damage to the flue
pipe or undue danger to persons in the vicinity.
Check that the flue and chimney are clear from any
obstruction.
Wessex boilers are suitable for installation in a
balanced compartment in accordance with the
requirements of
BS 6644
. Consult Hamworthy
Heating Technical Department for help or
assistance if in doubt.
Содержание Wessex 100 M100
Страница 39: ...Notes ...
