INSTALLATION AND OPERATION INSTRUCTIONS
5-4
HC SERIES BOILERS HC 13-50, HC 23-84, HC 29-106, HC 20-125, HC 33-160
11. Restore water pressure to the boiler.
12. Restore power to the boiler.
5.2.5 Vent High-Limit
This sensor has been installed to ensure the boiler is shut down safely if the heat
exchanger or the venting system becomes blocked.
The Vent Hi-Limit is located at the bottom of the heat exchanger just to the left of
the vent outlet and above the condensate tray. For access, remove the vent stack
and the condensate tray.
5.2.6 Domestic Hot Water Flow Sensor
Section Reserved for the DC Series Boilers.
5.2.7 Domestic Hot Water Sensor
Section Reserved for the DC Series Boilers.
5.2.8 Outdoor Sensor
An Outdoor Sensor is supplied with each boiler. The sensor should be mounted
on the north side of the building away from any direct sunlight. The sensor must
also be kept away from any heat sources such as exhaust fan outlets, dryer
outlets, mechanical room ventilation grills etc.
The Outdoor Sensor is a 12KΩ sensor with resistance values as listed in Table
12. If the sensor is not connected to the boiler, the boiler will operate at the Boiler
Supply Temperature set in the User Set Up menu and operate as a Set Point
load.
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