Lennox International Inc G32Q5-100, G32Q3-100, G32Q5-125, G32Q3-75 Cleaning the Bumer Assembly

34 - Reconnect widng to gas valve. Brown wire to "HI," yellow wire to "C" and orange wire to "M." Reconnect wires to name roll-out switch.

NOTE - Unit is polarity-sensitive. 120V supply wiring must be installed correctly

35 - Reconnect main gas line to gas valve. Use second wrench on gas valve to avoid transferring torque to the gas manifold.

36 - Reinstall field make-up box if removed.

37 - Reinstall exhaust pipe/flue collar and secure flue col- lar to the unit top cap using existing screw. Insert the bottom of the flue collar into the top of the flue transi- tion and tighten hose clamp.

38-Reinstall intake pipe fitting on burner box with screws.

39 - Replace both upper and lower access panels.

40 - Refer to instruction on verifying gas and electrical connections when re-establishing supply.

41-Following lighting instructions from installation manual, light and run unit for 5 minutes to ensure heat exchanger is clean, dry and operating safely.

Cleaning the Bumer Assembly

1 - Turn off electrical and gas power supplies to furnace. Remove upper and lower furnace access panels.

2 - Disconnect the gas supply line to gas valve. Depend- ing on gas plumbing installation, the gas manifold may move aside enough that breaking the union may not be necessary.

3 - Remove five screws from edges of burner box cover. 4 - Loosen two screws on bottom of burner box front.

The cover is key holed at these screw point so screws do not need to be removed. Pull off cover and set aside.

6 - Mark all gas valve wires and disconnect them from valve.

7 - Mark and disconnect sensor wires from the burner box at the ignition control. Disconnect 2-pin plug from the ignitor at the burner box.

8- Loosen two screws at the gas manifold support bracket.

9 - Pull on the left side of the gas manifold and follow with tension to the right side. The manifold support bracket will be free of the mounting screws on the vestibule panel. Set the gas manifold/gas valve as- sembly aside. Take care not to damage foam gas- kets on each end of the gas manifold.

10-Using a 1/4 inch nut driver, remove the burner mounting screws from underneath the burners.

11 -While supporting ignitor and sensor lines at the grommet, grasp burners and simultaneously pull burners and grommet out of the burner box.

12 - Remove ignitor and sensor bracket assemblies from

burners using a 1/4 inch nut driver to remove two screws from each bracket.

13 - Clean burner by running a vacuum with a soft brush attachment over face of burners. Use burner brush to clean inside of burners. Visually inspect inside of burners and crossovers for any blockage caused by foreign matter. Remove any blockage.

14 - Reinstall ignitor and sensor bracket assemblies on burners.

NOTE - Ignitor must be installed on the opposite side of the burner from the metal button protrusions. Screws which attached the ignitor bracket must be installed from the same side as the ignitor and through the bracket to en- gage in the smaller holes located in the burner. The cor- rect burner orientation is with metal button protrusions al- ways pointing up.

15 - Replace burner ignitor assembly back into burner box so that grommet groove fits back into sheet met- al notch and makes a good seal. The bumers sit on top of the burner box flanges. Make certain that the screws from underneath the box pass through the

larger holes in the flange and engage in the smaller holes in the burner. Reinstall the two screws.

16 - Reinstall the gas manifold/gas valve assembly by first inserting the right hand side of the gas manifold into the burner box. Swing left side of manifold into box while engaging support bracket to vestibule pan- el screws. Check that foam gaskets are providing a seal around each end of the gas manifold.All gas ori- rices should be engaged. If at this point the burners were mounted in the wrong holes, this needs to be

corrected. The saddle brackets on the gas manifold should be flush with the front surfaces on the burner box sides.

17 - inspect the dual layered metal pieces at the front lip of the cover. These pieces must sandwich around the metal. Reinstall burner box cover.

18 - Reinstallthe screws to secure the burner box cover.

Make sure screws are tight to ensure a leak tight burner box. Tighten the two screws underneath the

box. Again, inspect the grommet to ensure a tight seal.

19 - -tighten the two screws holding the manifold bracket to the vestibule panel.

20 - Reinstallthe electricalconnections to the gas valve.

Brown wire to "HI" yellow wire to "C" and orange wire to "M."

21 - Reinstall the 2-pin ignitor plug at the burner box. Re- install sensor line to ignition control spade connector.

22 - Reconnect gas line to gas valve.

23 - Replace lower access panel.

24 - Following lighting instructions and gas line connec- tion test procedures from installation manual.

25 - Replace upper access panel.

Page 26