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1.4.3 Operation of the storage
water heater.
Normal operation
When there is a demand for heat a
waiting period of about 1 second elapses
before the built-in spark generator and
pilot gas valve are switched on. The
ignition sparks ignite the pilot burner
and the resulting ame is detected
by the ionisation electrode. Almost
immediately after the pilot ame is
detected, sparking stops and the main
gas valve is openend. The main burner
is lit by the pilot ame. The unit is now in
operation. When the temperature of the
water in the unit reaches the temperature
that is set with the thermostat, the
thermostat switches and disconnects
the electrical heat demand signal to the
burner controller. The gas valves are
then closed.
Ignition failure
If the ame is not established within
the safety period the automatic ignition
controller locks out. The safety period is
about 25 seconds. Lock-out is indicated
by the lamp in the RESET-button on
the control panel. The unit has to be
manually reset by pushing the reset
button. If the ame is lost during normal
run, the automatic ignition controller
repeats the start sequence.
1.4.4 Combustion products
discharge safety device
The heater has been tted with a
combustion products discharge safety
device. It is the function of the safety
device to prevent ue gases from the
water heater entering the room where
the water heater has been placed,
instead of passing through the ue to
outside atmosphere. The gas supply
is disconnected as soon as the device
is activated by hot gases owing
over the sensor. After the cause of
the re-entry of ue gases has been
traced the device can be put back into
operation by pressing its reset button.
If this failure occurs frequently, this
indicates that the ue suffers from down
draught conditions. It is recommended
that a competent person carry out the
necessary remedial action.
Important
The combustion products discharge
safety device should never be put out
of operation.
Re-entry of ue gasses to the building
could be harmful and cause poisoning
or death.
7


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