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Applications Manual
System # 23
Low Voltage Wiring
out sen
LWCO
BUS
TT
1
2
3
4
T T
Zone 1
Zone 4 relay
N/O Com N/C
End
End
switch
switch
Wiring:
Low Voltage
Remove factory jumper from terminal #2 and
connect End Switch of Multi-Zone relay (dry
contacts only) to terminal #2
Heatronic Settings:
Boiler
Typical supply
Heating
temperatures
Dial
1
approx. 95 °F (35 °C)
2
approx. 109 °F (43 °C)
3
approx. 122 °F (50 °C)
4
approx. 140 °F (60 °C)
5
approx. 153 °F (67 °C)
6
approx. 167 °F (75 °C)
max
Approx. 194 °F (90°C)
DHW thermostat
min
e
max
Bosch Thermotechnology Corp.
DHW sen
5
6
Tank
Aquastat
Thermostats
T T
T T
T T
Zone 2
Zone 3
Zone 4
24 VAC
Transformer
Zone 1
Zone 3
Zone 2
1
2
3
4
1
2
3
4
1
2
3
4
2-wire
3-wire
4-wire
Zone
Zone
Zone
valve
valve
valve
Application
Frost protection
Radiant floor heating
Panel radiator system
Cast Iron radiator system
Baseboard & convector system
Typical DHW temperatures
approx. 59 °F (15 °C)
approx. 131 °F (55 °C)
approx. 158 °F (70 °C)
Line Voltage Wiring
L
L
N
red
white
storage
mains
tank pump
120v/60 hz
Zone 4
priority
off
on
Note: For Low Water Cutoff Wiring see
Zone 4
1
2
3
4
Line Voltage
Wire Main power supply (120 v) to White molex
of Boiler
Wire System Circulator to end switch of Relay
Wire DHW Circulator to Normally Open priority
contacts of Relay
3
4
2
1
Bosch Greenstar | 51
L
N
N
black
ch pump
for unmixed heating
(Not Used)
Appendix E of this manual
Neutral
Ground
120 V Line
3
4
5
2
6
1
max
Data subject to change
reset
eco
e
6
max
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