5. Remove the screw and pull off the electrical connector from the gas valve, and disconnect the three-
(3) wire Molex plug from the the gas pressure switches.
6. Unscrew the four (4) bolts of the flange to separate the gas valve inlet from the gas line. Keep gasket
and bolts for re-assembly. (See l on Figure 38 .)
7. Remove the four 5/16" hex head bolts that attach the gas valve assembly to the mixing device. (See
j on Figure 38 .) These bolts should be first loosened slightly in a cross sequence to prevent
deformation of the mating parts.
8. Carefully move aside the gas valve assembly, and retain the O-ring for re-installing.
9. Remove the four (4) ¼" hex bolts that connect the mixing device to the air filter box. The gasket should
remain attached to the air filter box.
10. Remove the four (4) 10 mm hex bolts that attach the fan to the heat exchanger lid. An open-ended
wrench or socket is required.
11. With the mixing device still attached, remove the fan by pulling straight up ensuring that no wires are
caught and that the gas line remains in place. Place the removed components in a clean, dry area
12. Unplug the ignitor from the lid and place in a safe place.
13. Loosen the eight (8) 5 mm Allen lid fasteners securing the lid to the heat exchanger. Mark the
orientation of the lid onto the heat exchanger with a marker.
14. Carefully lift up on the lid and remove. Be careful not to damage the refractory insulation. Place the lid
and burner assembly in a clean dry area.
15. Carefully loosen the burner cap screws and remove. Keep the cap screws for re-installation.
16. Separate the burner from lid. Replace the burner gasket upon re-installaion.
17. Re-install the components in reverse order of the steps above.
Warning
After removing a burner, it is imperative that you perform a gap analysis on the ignitor.
6.3.3 Replacing the burner
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