4
PART 1. GENERAL INFORMATION
PART 1. GENERAL INFORMATION
A. HOW IT OPERATES
The EVO 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. If the internal water
temperature drops to 37°F, a burn
cycle will be initiated and will shut
down as soon as the supply water
temperature has reached 50°F.
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.
