(b)
Top Flue Outlet
The cooker should be connected to the main flue via a
150mm minimum diameter cast iron pipe or appropriately
internally externally vitreous enamelled mild steel pipe and
be sealed to the cooker flue chamber with soft rope and fire
cement.
Any bends in the flue pipe must be not less than 135º (45º
from horizontal) and be complete with a cleaning door.
In Fig. 2. the cooker is installed in an existing recess. There
must be a clearance of not less than 150mm between the top of
the flue pipe and any overhanging brickwork.
Any cavities or pockets above the register plate should as far
as possible be filled and if necessary the flue pipe should be
extended into the throat of the chimney and soot door provided
for chimney sweeping.
If a flue liner or insulated chimney is used, the size should not
be less than 185mm square or 225mm diameter, and 175mm
diameter respectively.
In Fig. 3, the cooker is connected direct to a brick flue.
Horizontal pipe runs between cooker and brick flue
must not
be used.
In Fig. 4, the cooker is connected to an existing brick flue with a
length of flue pipe. Square bends and horizontal runs
must not
be used. There must be a cleaning door at every bend.
NOTE
: WHATEVER METHOD OF INSTALLATION IS
EMPLOYED, AIR MUST NOT BE ALLOWED TO ENTER THE
CHIMNEY EXCEPT THROUGH THE COOKER. ALL JOINTS
MUST BE AIR-TIGHT.
If the chimney is unlined, and there is any doubt about its
condition, it should be lined in accordance with current Building
Regulations.
PROVISION MUST ALWAYS BE MADE FOR SWEEPING
THE CHIMNEY.
IMPORTANT
: CEMENT TYPE PIPES AND FITTINGS MUST
NOT BE USED WITHIN 2m. OF COOKER. CHIMNEYS OF
PLAIN PIPE ARE NOT RECOMMENDED BUT CERTAIN
PROPRIETARY MAKES OF INSULATED CHIMNEY ARE
SUITABLE.
Provision must be made for a permanent unobstructed air vent
having a minimum effective area of 182.5cm2 (28.25sq in)
communicated directly to outside air or an adjacent room which
itself has a permanent air vent of at least the flue size direct to
outside air.
Effect of Extractor Fan
Avoid if possible the installation of extractor fan in the same
room as the cooker. Compensating extra air inlets must be
introduced equivalent to the capacity of the fan when fitted.
It is recommended that a 190 litre (40 galls) indirect hot water
storage cylinder of the double feed type e.g. (Manufactured by
Albion Cylinders, complying with BS. 1566 Part 1:DF Type 10)
should be lagged and fixed vertically as near as possible to the
cooker.
The 28mm minimum diameter primary flow and return pipes
must not exceed 10m in length and pipes longer than 5m must
be lagged.
Ensure that the flow pipe has an open vent and rises
continuously from the boiler to the cylinder to ensure good
gravity circulation.
In combined systems, the water draw-off pipes to the taps must
be dead-leg connection from the vent/expansion pipe.
There are only two boiler tappings on this cooker and a typical
design layout is shown in Fig. 5.
An injector tee is provided which must be fitted to ensure
adequate primary flow circulation when the water circulator is
operating, otherwise there may be a lack of domestic hot water.
The heating flow and return pipes may be 22mm, the return
pipe being connected to the 28mm primary return by the
injector tee, and the tee outlet connected to the boiler return
pipe.
4
BOILER - Control
AIR SUPPLY
CENTRAL HEATING AND
HOT WATER SYSTEM
FLUE LAYOUTS
Fig. 5 Typical Central
Heating/Hot Water System
Fig.6 Typical Wiring Diagram
DESN 510284’A’
DESN 510285
