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I-OH (01-20) PN120390R7
Outer Exhaust Door Panel
DETAIL A
Exhaust Box Cover
Heat Exchanger Tubes
DETAIL B
DETAIL C
Access Door Cover
Large Outer Door Panel
Combustion Chamber and
Heat Exchanger Passages
DETAIL A
DETAIL B
DETAIL C
MAINTENANCE—CONTINUED
Maintenance Procedures—Continued
Clean Combustion Chamber/Heat Exchanger and Flue Pipe—Continued
Figure 19. Exhaust Box
4. Remove two vertical pieces of woven gasket and leave horizontal gasket pieces still attached to vent pipe side
of opening.
5. On end of heater opposite burner, remove screw—using flat-head screwdriver—at bottom center of large outer
6. Remove large outer door panel—while supporting it—by lifting upward and outward on handle. Access door cover
7. Remove nuts that secure access door cover and pull cover directly forward off welded studs. Combustion chamber
and heat exchanger passages (see
Figure 20. Combustion Chamber/Heat Exchanger
8. Remove woven gasket material.
NOTE: If a furnace brush is not available, a cleaning rake may be fabricated as shown in