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INSTALLATION
HC SERIES BOILERS HC 13-50, HC 23-84, HC 29-106, HC 33-124, HC 20-125, HC 33-160
EXTERNAL LOW WATER CUT OFF DEVICE
DC Series Boiler Only - An external low water cut-off device is not required if the
boiler is only being used as a direct domestic hot water unit.
If an external low water cut-off device is required, an electronic probe style device
is recommended.
• The low water cut-off device must be installed in the boiler supply water
piping, with a tee connection, at a level above the top of the boiler.
• The low water cut-off device must be wired in series with the 120Vac power
supply so that when the device trips on a low water condition the power
supply to the boiler is interrupted.
NOTE
A hot water boiler installed
above radiation level or as
required by the Authority
Having Jurisdiction, must be
provided with a low water cut-
off device at the time of boiler
installation. If a low water
cut-off is not factory installed,
instructions shall be provided
for the installation and wiring
of a low water cut-off.
Figure 34: External Low Water Cut Off Device
Figure 34a: Alternate Low Water Cut Off Device Location
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