281 Issue 1 - Service Manual - BX3
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3.6 Burner
The burners are known as “In-shot” burners. They consist of a venturi, which helps to draw air
into the top of the burner, near the injectors. This is known as primary air and is used for gas
mixing before combustion occurs. Once the gas and primary air leave the burner port, at the exit
of the burner, combustion begins, and secondary air is added to the flame from the suction force
developed from the combustion fan. There is a cross lighting gallery near the burner exit, which
allows for cross ignition between each adjacent burner.
3.7 HCDSI24 -1 Control Board
The HCDSI24 -1 control is a single printed circuit board (PCB) assembly, mounted within a
plastic enclosure.
The controller provides status and diagnostic information directly through the use of a Green
LED indicator. An additional Red LED provides direct indication of the pressure switch status.
HCDSI 24 -1 Control Board
2 amp
fuse
Ignition coil
LED’s
24 Volt AC Connections
Ignition Plug
240Vac connection.
