North America • Latin America • India • Europe / Middle East / Africa • China • Pacific Rim
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Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit
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The ABH product line is an extremely high efficiency water heating product, requiring special venting and condensate removal
precautions. All high efficiency condensing appliances will require more maintenance (cleaning) than their non-condensing
counterparts. Failure to do so may result in damage to the appliance that is not covered under warranty. Failure to follow all of the
instructions contained in this manual may also cause premature product failure that may not be covered under warranty.
This appliance has built-in freeze protection, automatically activating the circulation pump when the internal water temperature
drops below 41°F (5°C). If the internal water temperature drops to 37°F (2.8°C), a burn cycle will be initiated and will shut down as
soon as the supply water temperature has reached 50°F (10°C). Power and gas must be left on for this function to operate.
The appliance’s primary controller the HOT™ BCB and BDB boards operate all functions of needed control and safety. It contains
sophisticated logic that allows it to operate at very precise temperatures while minimizing burner on/off cycling. When multiple units
are operated as a Cascade to handle a common load, the control logic contains the ability to control all of the units as efficiently as
one. Cascade operation is a factory-installed and programmed option, requiring a field wiring connection between appliances for
operation.
BCB= the internal Boiler Control Board.
BDB = the Boiler Display Board; human interface.
CCB = the Cascade Control Board, located in the external box.
CDB = the Cascade Display Board, human interface located in the face of the external box.
General Information
How It Operates
