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3.11 OPERATIONAL INSTRUCTIONS
HOT WATER
Open the gas and water valves and ensure that all joints
are tight.
Place the on-off switch (Fig. 8, pos. 1) in the operating
position (chapter 5.3), so that the appliance is ready for
use.
When a hot water tap is opened, the water flow sensor
will send a signal to the control unit. This signal initiates
the following:
• The fan starts.
• Spark generator provides a spark at the burner and
then the gas valve opens.
• The burner ignites.
• The ionisation electrode ensures the flame is present.
• The water temperature is controlled automatically by
the sensors/controllers according to the temperature
selected.
SAFETY CUT-OFF WHEN SAFETY PERIOD IS
SURPASSED
The appliance attempts three starts before it safety
circuit locks out. A single start attempt lasts 5 seconds
followed by a 5 second break before having a new
attempt. The start up cycle will last a maximum of 35
seconds before the appliance locks out on flame failure.
In this case, if the attempts to ignite go on too long, the
security mechanisms prevent operation.
SAFETY CUT-OFF DUE TO EXCESSIVE WATER
HEATING
The control unit detects the water temperature via a NTC
sensor located in the hot water flow pipe and the
temperature sensor located in the heat exchanger. If it
detects an excessive temperature it provokes a safety
cut-off.
RESTARTING AFTER SAFETY CUT-OFF
To restart the appliance following a safety cut-off:
B Press the reset key (Fig. 8, pos. 2).
6 720 646 322 (2012/05)
APPLIANCE INFORMATION
11
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