THIS APPLIANCE MUST NOT BE USED WITHOUT WATER
CONNECTED.
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.
All installations must be fitted with a drain tap at the lowest
point of the system.
Inhibitor
A corrosion inhibitor
MUST
be added to the heating system to
protect the heat exchanger and pipework. Inhibitor must also be
replaced if the system is drained after installation. As a
precaution, the heating system
MUST
also be flushed out prior
to the addition of the inhibitor to ensure any flux, debris is
removed.
In order to maximise the life of your boiler body, an electrical
thermal re-set low temperature boiler thermostat has been fitted
within the appliance, behind the LH side removable cover,
whose purpose is to isolate the electrical power from the water
circulator when the boiler thermostat falls below 60ºC (140ºF)
and thus minimise harmful condensation on the boiler surfaces.
The 3 core 0.75mm
2
cable lead from the appliance must be
connected to/from the water circulator as indicated on the
‘Typical Wiring Diagram’ in Fig. 6. Marked ‘Boiler Low
Temperature Return Thermostat’ - This switch is normally
closed during cooker operation and will open when the water
temperature falls preventing chilling of the boiler.
NOTE:
IF THERE IS A POSSIBILITY OF BOILING TAKING
PLACE A REVERSE ACTING THERMOSTAT SHOULD BE
FITTED TO THE DOMESTIC HOT WATER CYLINDER OR
BOILER PRIMARY FLOW PIPES, AND ELECTRICALLY
CONNECTED TO THE CENTRAL HEATING PUMP, THIS
WILL SWITCH THE PUMP ‘ON’ TO PREVENT BOILING. AT
LEAST ONE RADIATOR (USUALLY THE BATHROOM)
SHOULD
NOT
BE FITTED WITH A TRV (THERMOSTATIC
RADIATOR VALVE), TO ACT AS A HEAT LEAK, SHOULD
THE BOILER OVERHEAT AND THE PUMP FAIL TO START.
Tall chimneys may develop excessively high updraughts which
prevent the appliance operating correctly.
It is recommended that a proprietary brand adjustable flue
draught stabiliser having an openable cross sectional area of
182.5sq cm (6”ø pipe) be fitted above the flue pipe connection,
either in the brickwork or into a right angle ‘T’; fitting in the flue
pipe position that will not inconvenience appliance operation or
maintenance.
5
HIGH UPDRAUGHTS
BOILER - Control
CENTRAL HEATING AND
HOT WATER SYSTEM
