Step Down Transformer; Burner Tray Assembly; Burner Tray; Burner - A.O. Smith PREFERRED BPD 400 Installation, Operation, Service, Maintenance, Limited Warranty

Gas-fired induced draft for domestic hot water
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STEP DOWN TRANSFORMER

The controls system utilizes a 120/24 VAC step down transformer.
Most of the control system utilizes 24 VAC for operation. See wiring
diagram for those components utilizing 24 VAC and 120 VAC.
P120/24 VAC STEP DOWN TRANSFORMER

BURNER TRAY ASSEMBLY

The appliance is equipped with a user friendly burner tray assembly.
The assembly consists of a burner tray for mounting the burners,
manifold and orifices along with the gas valve and pilot assembly. It
can be easily removed by sliding the assembly in and out like a drawer
due to slide mounts in the combustion chamber.
BURNER TRAY ASSEMBLY - NATURAL

BURNER TRAY

The burner tray holds the burners in place and is used to slide the
entire assembly into the combustion chamber.
BURNER TRAY
The appliance is equipped with 8 burners mounted in a burner tray
assembly. The burners are tubular in design with two rows of small slit
burner ports. The natural gas burners are made of aluminized steel and
the LP version is a stainless steel material.
TUBULAR BURNER ASSEMBLY

BURNER ORIFICE

The burner orifice regulates the input to the main burners.
BURNER ORIFICE

BLOWER ASSEMBLY

The blower assembly functions by pulling in air from the outside of the
unit to supply the main burners located in the combustion chamber for
proper combustion. The blower pulls the air through the combustion
chamber and flue tubes where the flue gases then exit the exhaust vent.
FASCO BLOWER ASSEMBLY
8

BURNER

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