Applications Manual Bosch Greenstar | 47
Bosch Thermotechnology Corp.
Data subject to change
System # 21
reset
eco
1
2
34
5
6
max
1
2
34
e
6
max
Boiler
Heating
Dial
1
2
3
Typical supply
temperatures
approx. 95 °F (35 °C)
approx. 109 °F (43 °C)
approx. 122 °F (50 °C)
4
5
6
approx. 140 °F (60 °C)
approx. 153 °F (67 °C)
approx. 167 °F (75 °C)
max Approx. 194 °F (90°C)
Application
Frost protection
Radiant floor heating
Panel radiator system
Cast Iron radiator system
Baseboard & convector system
Neutral
Ground
Heatronic Settings:
Low Voltage
Ź Remove factory jumper from terminal #2 & #4
connect End Switch of Multi-Zone relay (dry
contacts only)
Wiring:
Line Voltage
Ź Wire Main power supply (120 v) to White molex
of Boiler
Zone 1
1 2 3 4
Zone 3
1 2 3 4
Zone 4
1 2 3 4
Zone 2
1 2 3 4
T T
Zone 1
T T
Zone 2
T T
Zone 3
T T
Zone 4
End
switch
End
switch
Zone 4 relay
N/O Com N/C
off
on
Zone 4
priority
24 VAC
Transformer
2-wire
Zone
valve
3-wire
Zone
valve
4-wire
Zone
valve
Tank
Aquastat
Thermostats
Ź Wire System Circulator to end switch of Relay
Ź Wire DHW Circulator to Normally Open priority
contacts of Relay
External Boiler
Junction box
Heatronic Internal Wiring
B
B
4
2
1
A
F
9
7
8
LWCO
Supply Sensor
Dry contacts
Bosch Controls
Outdoor
Sensor
Supply Sensor
120 Vac
L
N
red
storage
tank pump
L
N
black
ch pump
for unmixed heating
(Not Used)
L
N
white
mains
120v/60 hz
Note: For Low Water Cutoff Wiring see
Appendix D of this manual
DHW thermostat
min
e
max
Typical DHW temperatures
approx. 59 °F (15 °C)
approx. 131 °F (55 °C)
approx. 158 °F (70 °C)
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