40
Fig. 56 — Heat Exchanger Assembly
Burners and Igniters
MAIN BURNERS
To access burners, remove the control box access panel and slide
out burner partition panel. At the beginning of each heating
season, inspect for deterioration or blockage due to corrosion or
other causes. Observe the main burner flames and adjust, if
necessary.
Orifice projection
Refer to Fig. 57 for maximum projection dimension for orifice
face to manifold tube.
Fig. 57 — Orifice Projection
REMOVAL AND REPLACEMENT OF GAS TRAIN
See Fig. 52, 56, 58, and 59.
1. Shut off manual gas valve.
2. Shut off power to unit.
3. Remove the control box access panel.
4. Remove the control box high voltage cover.
5. Remove the screw at the base of the burner partition panel
(see Fig. 58) and slide out the panel.
6. Disconnect gas piping at unit gas valve.
7. Remove wires connected to gas valve. Mark each wire.
8. Remove igniter wires and sensor wires at the Integrated
Gas Unit Controller (IGC). (See Fig. 60.)
9. Remove the two screws attaching the burner rack to the
vestibule plate (see Fig. 56).
10. Slide the burner tray out of the unit (see Fig. 59).
11. Reverse the procedures outlined above to reinstall the
burner rack.
Heater Tube
Assembly
Seal Strips,
Sponge Rubber
Regulator
Gasket
Regulator
Retainer
Burner Assembly
Inducer Fan-motor Assembly
Flue Cover
Assembly
Vestibule
Plate
CAUTION
EQUIPMENT DAMAGE HAZARD
Failure to follow this CAUTION can result in premature wear
and damage to equipment.
When working on gas train, do not hit or plug orifice spuds.
Orifice
1.00 in.
(25.4 mm)
Manifold
Pipe
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