5
Fig 6. Typical Wiring Diagram
Fig 5.
Typical Central Heating/Hot Water System
DESN 510184
DESN 510184
AIR SUPPLY
CENTRAL HEATING AND
HOT WATER SYSTEM
If the chimney is unlined, and there is any doubt about its
condition, it should be lined in accordance with Building
Regulations J/1/2/3.
PROVISION MUST ALWAYS BE MADE FOR
SWEEPING THE CHIMNEY.
IMPORTANT: CEMENT TYPE PIPES AND FITTINGS
MUST NOT BE USED WITHIN 2m OF THE COOKER.
CHIMNEYS OF PLAIN PIPE ARE NOT
RECOMMENDED BUT CERTAIN PROPRIETARY
MAKES OF INSULATED CHIMNEY ARE SUITABLE.
Provision must be made for additional ventilation. A
permanent unobstructed air vent having a minimum
effective area of 22cm
2
must communicate to outside air
or an adjacent room which in turn has a permanent vent
of at least the same size to outside air.
If a flue draught stabiliser is fitted in the flue this vent size
must be increased to a minimum 49cm
2
. If this appliance
is used with an additional appliance of a similar type then
the air supply must be adequate for both appliances in
accordance with Building Regulations.
Any air inlet grilles must be positioned so that they are
not liable to blockage.
Effect of Extractor Fan
It is not permissible to use an air extraction device in the
same room as the appliance unless ventilation is
provided to prevent any adverse effect on the flue.
The maximum water pressure is 1.75 bar.
The water capacity of the boiler is 12 litres.
It is recommended that a 190 litre 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
output connected to the boiler return pipe.
All installations must be fitted with a drain tap at the
lowest point of the system.
