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D-GAS HEAT COMPONENTS
1-Heat Exchanger FIGURE 9
HEAT EXCHANGER ASSEMBLY
BURNER
COMBUSTION
AIR INDUCER
VENT
CONNECTOR
GAS VALVE
HEAT
EXCHANGER
TUBE
FIGURE 9
LDT units use stainless steel steel inshot burners with tu-
bular stainless steel heat exchangers and two-stage re-
one eleven tube/burner for high heat, one nine tube/burn-
er for medium heat and one six tube/burner for standard
heat.
LDT078 units use one eight tube/burner for medium heat
and 0ne six tube/burner for standard heat. Burners in all
units use a burner venturi to mix gas and air for proper
combustion.
Combustion takes place at each tube entrance. As hot
combustion gases are drawn upward through each tube
by the combustion air inducer, exhaust gases are drawn
out the top and fresh air/gas mixture is drawn in at the bot-
tom. Heat is transferred to the air stream from all surfaces
of the heat exchanger tubes. The supply air blower forces
air across the tubes to extract the heat of combustion. 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.
2-Gas Heat Exchanger Inserts (Some LDT Units)
-
changers in tubes one and three. Medium and high heat
exchangers do not require inserts. See FIGURE 10. In-
serts are used to maintain even temperature distribution
through the heat exchanger. Temperature distribution can
-
changer tubes and the blower deck opening.
3-Burner Box Assembly FIGURE 11
sensing electrode, gas valve and combustion air blower.
valve are directly controlled by ignition control. Ignition
Unit Controller.
Burners
All units use cluster type inshot burners. Burners are
factory set and do not require adjustment. A peep hole
with cover is furnished in the heating access panel for
panel in place.
Burners can be removed for service as an assembly.
Burner maintenance and service is detailed in the
SERVICE CHECKS section of this manual.
STANDARD HEAT (130,000BTUH)
INSERTS (2)
INSERT LOCATION
FIGURE 10
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