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Applications Manual
System # 19
Low Voltage Wiring
out sen
LWCO
BUS
TT
1
2
3
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
4
5
6
Thermostats
T T
T T
T T
T T
Zone 2
Zone 3
Zone 4
Zone 1
Zone 3
Zone 2
1
2
3
4
1
2
3
4
1
2
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
N
white
mains
120v/60 hz
Zone 4
priority
off
on
24 VAC
Transformer
Zone 4
3
4
1
2
3
4
Line Voltage
Wire Main power supply (120 v) to White molex
of Boiler
Wire System circulator to Zone Relay end switch
2
1
Bosch Greenstar | 43
L
N
black
ch pump
for unmixed heating
(Not Used)
Note: For Low Water Cutoff Wiring see
Appendix E of this manual
Neutral
Ground
120 V Line
3
4
5
2
6
1
max
Data subject to change
reset
eco
3
4
e
6
max
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