Bosch ZBR16-3A Series Installation And Service Instructions Manual page 15

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Key to Fig. 7:
[1]
Ignition transformer
[2]
Boiler high limit dial
[3]
120 VAC connection
[4]
DHW tank primary pump or 3-way valve
[5]
External heating pump for unmixed heating circuit (secondary
2)
circuit)
or DHW recirculation pump
[6]
Fuse T 6.3 A (120 VAC)
[7]
DHW thermostat
[8]
External safety high limit or low water cut off (LWCO)
[9]
BUS connection, e.g. heating control
[10] Room thermostat – dry contact
[11] Outdoor temperature sensor
[12] Code plug
[13] Diagnostic interface
[14] ON/OFF switch
[15] Gas valve
[16] Fan
[17] Flue gas temperature limiter
[18] Supply temperature sensor
[19] Flame rod electrode
[20] Ignition electrode
[21] Boiler block temperature limiter
[22] DHW tank temperature sensor (NTC)
[23] Boiler circulator
[24] Additional supply temperature limiter
[25] External system supply temperature sensor
1) Set the service function 1.F, page 59
2) Set the service function 5.E,  page 62
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Information about the appliance | 15
6 720 806 992 (2015/03)

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