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Applications Manual
Appendix D: Wiring Hydrolevel Safgard 1100 Low Water Cut-off
to Greenstar Wall Boiler
Main Power
Supply
120 V
Ground
Neutral
Transformer
120 VAC
Install a 24VAC 20VA Transformer near the boiler
Follow LWCO manufacturer's instructions
Connect the lead labeled BOILER GROUND (green) to the ground wire of the white plug in the boiler
junction box
Connect the leads labeled 24V HOT(red) and 24V COMMON(white) to the external 24VAC transformer
(field supplied)
Inside the Heatronic Control of the boiler, remove jumper from terminal #8 and #9 and connect the leads
labeled SWITCH CONTACT (yellow) to terminals #8 and #9
Bosch Thermotechnology Corp.
L
N
white
mains
120v/60 hz
White
Red
24 VAC
Hydrolevel Safgard 1100
Low Water Cut-Off
N
L
L
N
red
black
storage
ch pump
tank pump
for unmixed heating
Green
Yellow
Yellow
Bosch Greenstar | 71
External Junction
Box on Bottom of
Greenstar Wall boiler
Heatronic Control
B
Bosch Controls
B
4
Dry contacts
2
1
A
Outdoor
Sensor
F
Supply Sensor
Data subject to change
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