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Electrical Diagram; 2.10 Function - Bosch WR11B series Installation Manual And Operating Instructions

Gas instantaneous water heater
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8 | Technical Characteristics and Dimensions
2.9

Electrical diagram

Fig. 3
Electrical diagram
1
Servo valve (normally open)
2
Diaphragm valve
3
Main valve (normally closed)
4
Ionisation detector
5
Igniter electrode
6
Flue gas safety device
7
Temperature limiter

2.10 Function

This gas heater is equipped with automatic electronic
ignition which simplifies its operation.
B To do so, just turn on the switch ( Fig. 6).
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 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.
6 720 648 592 (2011/06)
8
Igniter unit
9
LED indicator for battery charge level
10
LED indicator for burner status
11
ON/OFF switch
12
Batteries, 1.5V
13
Microswitch
Air in the gas supply pipe when the heater is
started up may cause ignition to fail.
If this happens:
B Close and open the hot water tap to repeat the
ignition process until all the air has been purged.

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