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Applications Manual
System # 17
Heatronic Internal Wiring
Bosch Controls
Dry contacts
Supply Sensor
Note: For Low Water Cutoff Wiring see
Appendix D of this manual
Wiring:
Low Voltage
Remove factory jumper from terminal #2 & #4
and connect to End Switch of Mult-Zone relay (dry
contacts only)
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.
End
End
switch
switch
B
B
4
2
1
A
Outdoor
Sensor
F
Outdoor Sensor
If using FW200 (Optional):
install FW200 on front of
boiler (see manual)
install outdoor air sensor
Follow FW200 Quick
Set-up guide in Appendix C
Supply Sensor
Application
Frost protection
Radiant floor heating
Panel radiator system
Cast Iron radiator system
Baseboard & convector system
Typical DHW temperatures
approx. 104 °F (40 °C)
approx. 122 °F (50 °C)
approx. 140 °F (60 °C)
T T
T T
T T
Zone 1
Zone 2
Zone 3
Zone 4 relay
N/O Com N/C
Zone 1
Zone 2
1
2
3
4
1
1
2
3
4
2-wire
3-wire
Zone
Zone
valve
valve
External Boiler Junction box
Line Voltage
Wire Main power supply (120 v) to White molex
of Boiler external junction box
Wire 120 Vac power supply to zone relay
3
2
1
Bosch Greenstar | 39
Zone 4
priority
off
T T
Zone 4
on
24 VAC
Transformer
Zone 3
Zone 4
2
3
4
1
2
3
4
4-wire
Zone
valve
L
L
N
black
white
ch pump
mains
for unmixed heating
120v/60 hz
(Not Used)
4
3
5
2
6
1
max
Data subject to change
Neutral
120 VAC
Ground
N
reset
eco
4
e
6
max
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