PLUMBING
REGULATIONS
The plumbing must be in accordance with all relevant regulations and practices. It must include a gravity circuit with expansion pipe, open to the atmosphere. The central heating will be
GRAVITY CIRCUIT
The gravity circuit consists of the domestic hot water tank of 135 litres indirect cylinder, fixed in an upright position, recommended for hot water storage and it should be connected to the boiler by 28mm diame- ter flow and return piping. The pipes should not exceed 7.8 meters (25ft) in length and cylinder and pipework should be fully lagged. The shorter the run of pipe work the more effective the water heating.
There must be no gate valves on this circuit and it must have an expansion pipe exhausting to atmos- phere. Cylinder and pipe work should be lagged to minimise heat loss.
This diagram illustrates the basic principal of water heating systems and must not be regarded as a
working drawing.
Fig.9
WATER CIRCUIT TEMPERATURE
The return water temperature should be maintained at not less than 40°C so as to avoid condensation on the boiler and return piping. Fitting a pipe thermo- stat to the return pipe of the gravity circuit and wiring it into the pump control will ensure rapid circulation of the hot water.
In some circumstances it may be possible to over- heat the appliance and the water inside will boil. This will be evident by the sound of a knocking noise coming from the appliance and pipes around the house. If this occurs close off all air controls and manually start the central heating pump if fitted. Opening the oven doors and hotplate covers will help to release heat from the appliance. Be aware that steam and boiling water will be expended from any open vent from the heating system probably in the roof space at the expansion tank.
In the unlikely event that the appliance is not oper- ating in freezing conditions the water must be drained from the boiler to prevent frost damage.
OPERATING INSTRUCTIONS
Never use gasoline or gasoline type lantern fuel, kerosene, charcoal lighter fluid or similar liquids to start or ‘freshen up’ a fire in this heater. Keep all such liquid well away from the heater at all times. Operate stove only with fuelling door and ashpit doors closed. This heater is hot whilst in operation. Keep children, clothing and furniture a safe distance away.
PRIMARY AIR CONTROL
Fig.10
INJECTOR TEE
Where the gravity and central heating circuits join together to return to the stove we recommend the use of an injector tee connection, situated as close to the unit as possible. This type of tee encourages a stable flow of water through both circuits and helps to prevent priority being given to the stronger flow, which is most commonly the pumped central heating circuit.
Setting 0: Closed
Setting 4: Maximum Heat
Rotate the knob to the required setting. The num- bers are a guide only and experience will dictate the desired setting for comfort. The numbers indicate the degree of opening of the control flap from
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