Page 30
Units use aluminized steel inshot burners with match-
ing tubular aluminized (stainless steel is an option) steel
heat exchangers and two-stage redundant gas valves.
two six-tube/burners for standard or low heat and two
ninetube/ burners for medium heat. Burners in all units
use a burner venturi to mix gas and air for proper combus-
tion. Combustion takes place at each tube entrance.
As hot combustion gases are drawn upward through each
tube by the combustion air blower, exhaust gases are
drawn out the top and fresh air/gas mixture is drawn in
at the bottom. Heat is transferred to the air stream from
all surfaces of the heat exchanger tubes. The supply air
blowers, controlled by the Unit Controller A55, force air
across all surfaces of the tubes to extract the heat of com-
bustion. The shape of the tubes ensures maximum heat
exchange. The gas valves accomplish staging by allowing
more or less gas to the burners as called for by heating
demand.
HEAT EXCHANGER
(one heat section shown)
BURNER
COMBUSTION
AIR INDUCER
VENT
CONNECTOR
GAS VALVE
HEAT
EXCHANGER
TUBE
HEAT EXCHANGER
(one heat section shown)
BURNER
COMBUSTION
AIR INDUCER
VENT
CONNECTOR
GAS VALVE
HEAT
EXCHANGER
TUBE
FIGURE 18
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