Bosch FS 100 - Appendix E: Wiring Hydrolevel Safgard 1100 Low Water Cut-Off to Greenstar Floor Boiler

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Bosch Greenstar Applications Manual
Bosch Thermotechnology Corp.Data subject to change
120 VAC
24 VAC
L
N
red
storage
tank pump
L
N
black
ch pump
for unmixed heating
L
N
white
mains
120v/60 hz
Ground
Neutral
120 V
Transformer
External Junction
Box on back of
Greenstar Floor
boiler
Low Voltage Junction
Box on back of floor
boiler
Hydrolevel Safgard 1100
Low Water Cut-Off
ŹInstall a 24VAC 20VA Transformer near the boiler
ŹFollow LWCO manufacturer’s instructions
ŹConnect the lead labeled BOILER GROUND (green) to the ground wire of the white plug in the boiler
junction box
ŹConnect the leads labeled 24V HOT(red) and 24V COMMON(white) to the external 24VAC transformer
(field supplied)
ŹAT the Low Voltage box on the rear of the boiler, remove the jumper acros the LWCO connections and
connect the leads labeled SWITCH CONTACT (yellow) to these connections.
Appendix E: Wiring Hydrolevel safgard 1100 Low Water Cut-Of
to Greenstar Floor Boiler
Main Power
Supply
Yellow
Yellow
Green
White
Red
BUS
TT
out sen
LWCO
DHW sen
1
2
3 4
5 6