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Cleaning the Heat Exchanger and Burners
NOTE - Use papers or protective covering in front of the
furnace during cleaning.
1 - Turn off both electrical and gas power supplies to fur-
nace.
2 - Remove flue pipe, top cap, flue chase and internal flue
pipe assembly from the unit.
3 - Label the wires from gas valve, rollout switches, prima-
ry limit switch and make-up box then disconnect them.
4 - Remove the screws that secure the combustion air in-
ducer/ pressure switch assembly to the collector box.
Carefully remove the combustion air inducer to avoid
damaging blower gasket. If gasket is damaged, it must
be replaced to prevent leakage.
gasket
flue chase
internal flue pipe
combustion air inducer
rollout switch
sensor
EL280DFE BURNER, C.A.I ASSEMBLY &
HEAT EXCHANGER REMOVAL
orifice plate
ignitor
burners
manifold and gas valve
5 - Remove the collector box located behind the combus-
tion air inducer. Be careful with the collector box gas-
ket. If the gasket is damaged, it must be replaced to
prevent leakage.
6 - Disconnect gas supply piping. Remove the screw se-
curing the burner box cover and remove cover. Re-
move the four screws securing the burner manifold
assembly to the vestibule panel and remove the as-
sembly from the unit.
7 - Remove screws securing burner box and remove burn-
er box.
8 - Remove screws from both sides, top and bottom of
vestibule panel.
9 - Remove heat exchanger. It may be necessary to
spread cabinet side to allow more room. If so, remove
five screws from the left side or right side of cabinet.
See FIGURE 23.
gasket
collector box
pressure switch
FIGURE 22
Page 27
heat exchanger
retention rings
cross over
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