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Applications Manual
System # 21
Heatronic Internal Wiring
Bosch Controls
Dry contacts
Outdoor
Sensor
Supply Sensor
Note: For Low Water Cutoff Wiring see
Appendix D of this manual
Wiring:
Low Voltage
Remove factory jumper from terminal #2 & #4
connect End Switch of Multi-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.
B
B
4
2
1
A
F
End
switch
Supply Sensor
External Boiler
Junction box
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)
Thermostats
T T
T T
T T
Zone 1
Zone 2
Zone 3
Zone 4 relay
N/O Com N/C
End
Zone 1
Zone 2
switch
1
2
3
4
1
2
3
2-wire
3-wire
Zone
Zone
valve
valve
L
N
white
mains
120v/60 hz
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
2
1
Bosch Greenstar | 47
Tank
Aquastat
Zone 4
priority
off
T T
Zone 4
on
24 VAC
Transformer
Zone 3
Zone 4
4
1
2
3
4
1
2
3
4
4-wire
Zone
valve
L
N
L
N
black
red
ch pump
storage
for unmixed heating
tank pump
(Not Used)
4
3
5
2
6
1
max
Data subject to change
Neutral
Ground
120 Vac
reset
eco
4
e
6
max
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