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• DESCRIPTION AND OPERATION
These gas water heaters are equipped with:
A stainless steel burner which can operate with Butane/Propane-Natural.
A pilot which will operate with either Butane/Propane. Ignition is by
piezoelectric or by the battery powered electronic spark ignition.
A fully automatic soft start ignition system which needs no adjusting. This
prevents any black smoke being given off during the main burner ignition
process.
A thermocouple safety valve which shuts off the gas supply to both pilot and
main burner in the event of accidental flame failure.
An inter-ignition valve which cuts off the supply of gas to the burner during the
pilot ignition process, even if there is water circulating through the appliance.
A total shut-off valve which shuts off the supply of gas to the burner and the
pilot, even during the response time before the safety valve closes.
A water valve which modulates the supply of gas to the burner in proportion to
the flow of water through the appliance.
A gas economy feature which enables the supply of gas to the burner to be
reduced by up to 60%, this function can be used when the ambient
temperature of the water supply is high.
An automatic water flow regulator to provide a constant flow rate at the tap at
varying pressures (Min supply pressure 1.0b Max supply pressure 10.0b )
A water temperature selector.
A heat exchanger made from pure electrolytic copper.
A draught diverter hood.
OPERATION
Once the appliance has been turned on following the procedure given in section
A.2.2.B “Instructions for starting up the appliance” gas is supplied to the burner
whenever a hot water tap is turned on.
As water flows through the appliance a pressure differential is created within the
water control assembly. This in turn will cause the diaphragm and push rod to lift
opening the main burner gas valve
When the hot water tap is turned off, the water flow through the appliance ceases,
and the pressure differential created in the water control assembly diminishes
returning the diaphragm and push rod to the no flow position. This will allow the
main burner gas valve to close.
Whilst the appliance is in operation, even if there are pressure fluctuations in the
mains supply providing these fluctuations are within the minimum and maximum
operating pressures, the temperature of the water is maintained at all
times at the selected temperature due to the action of the “automatic water flow
regulator”
10


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