Electrical Diagram; Function - Bosch WR 11 B Installation Manual And Operating Instructions

2.8

Electrical diagram

Fig. 2 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
[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
2.9

Function

This gas heater is equipped with
which simpli es its operation.
To do so, just turn on the switch (
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
automatic electr onic ignition
Fig. 5).
Technical Characteristics and Dimensions | 7
pilot burner ame is then exting
time.
This is a way of saving a great
burner only operates for the mi
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.
uished after a short period of
amount of energy as the pilot
nimum necessary time to ignite
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