Bosch KBR35-3A - Wiring

Common applications of KBR boilers
31
Greenstar FS/Combi FS – 6 720 810 590 (2020/04)
5.2.2 Wiring
When using CZM100 and CRC100 or CRC200 controls the factory
installed jumper at terminal [2e] remains.
The LWCO jumper on terminal [2g] is removed when using a LWCO.
For LWCO function an external transformer is required
Fig. 15 Wiring
[1] High Voltage connection box
[1a] 120 V AC mains power (white plug)
[1b] DHW Storage tank circulator pump (red plug)
[1c] System circulator pump (black plug)
[2] Low Voltage connection box
[2d] BUS EMS connection
[2e] TT - Thermostat/On demand signal (pre-wired link) (dry
signal)
[2f] Out Sen - (Outdoor sensor, sold separately)
[2g] LWCO - (pre-wired link) (Low Water Cut Off switch, sold
separately)
[2h] DHW Sen - (Tank sensor)
[2k] Empty (future connectivity)
[3] CZM100 (Comfort Zone Manager 100)
[4] PZ1, PZ2 - Zone circulator pumps
[5] CRC100 or CRC200 Zone 1 (Comfort room controller)
[6] CRC100 or CRC200 Zone 2 (Comfort room controller)
12
BUSBUS
1212
BUS BUS
1 2
≤ 24 V
NL
120VAC
120V AC
NNLNLL
PZ2 PZ3PZ1
121
1 2
T0 24VAC
24VAC
3 41 2
VZ1
VZ1
3 41 2
VZ2
VZ2
3 4 1 2
VZ3
VZ3
≤ 24 V
PZ1
DHW Tank Pump
Rear of Greenstar boiler
NL
120 V AC
0
1
2
3
4
5
6
CZM100
1234
1
2
3
4
56
BUS
TT
out sen
DHW sen
LWCO
1
2
3
4
56
BUS
TT
Out Sen
DHW Sen
LWCO
N
L
3
4
1
a
b
c
d
e
f k
2
6
5
h
g
PZ2
NL
6720810590-71 .2Wo
TT
LWCO