Bosch ZBR16-3A Series Installation And Service Instructions Manual page 31

Fig. 12 Wiring
[1] PCB in heating boiler ZBR..-3A... with FW 200 installed on front
[2] White plug for mains power supply, 120 V AC, 60 Hz
( chapter 7.3.4, page 49)
[3] 120 V AC, 60 Hz
[4] Red plug for external DHW tank ( chapter 7.3.3, page 49)
[5] DHW pump
[6] Taco Circulator Relay (SR504)
[7] Pump heating zone 1
[8] Pump heating zone 2
[9] Outdoor temperature sensor
[10] LWCO (Low Water Cut Off, 24V AC Transformer required)
[11] DHW temperature sensor (connection with clear connector)
[12] External supply temperature sensor (connection with white plug)
Greenstar
3
2
LS NS
N L
70
6
5
4
B
B
4
2
N L
F
A
1
Common Applications of ZBR boilers | 31
70
Zone 1 Zone 2 Zone 3 Zone 4 Power
7 8
9
10
11
12
6 720 806 992-06.1O
6 720 806 992 (2015/03)