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6 | Technical Characteristics and Dimensions
2.6
Electrical diagram
Fig. 2
Electrical diagram
[1] Servo valve (normally open)
[2] Diaphragm valve
[3] Gas valve for pilote burner (normally closed)
[4] Ionisation detector
[5] Igniter electrode
[6] Flue gas safety device
[7] Temperature limiter
[8] Igniter unit
[9] LED indicator for failure
[10] LED indicator for burner status
[11] ON/OFF switch
[12] Hydrogenerator
2.7
Function
This gas heater is equipped with automatic electronic ignition
which simplifies its operation.
▶ To do so, just turn on the switch (Fig. 3).
After this procedure, automatic ignition occurs whenever a hot
water tap is opened. First, the pilot burner is lit and
approximately four seconds afterwards the main burner. The
6 720 607 845 (2015/05)
pilot burner flame is then extinguished after a short period of
time.
This is a way of saving a great amount of energy as the pilot
burner only operates for the minimum necessary time to ignite
the main burner, in contrast to conventional systems which
operate permanently.
Air in the gas supply pipe when the heater is
started up may cause ignition to fail.
If this happens:
▶ Close and open the hot water tap to repeat the ignition
process until all the air has been purged.
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