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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 reĆestablishing supply.
41 - Following lighting instructions from installation
manual, light and operate unit for 5 minutes to ensure
heat exchanger is clean, dry and operating safely.
Cleaning the Burner Assembly
1 - Turn off electrical and gas power supplies to furnace.
Remove upper and lower furnace access panels.
2 - Disconnect the gas supply line from gas valve. DeĆ
pending on gas plumbing installation, the gas manĆ
ifold 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 has a key hole on each side, so screws do
not need to be removed. Remove the cover and set it
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 asĆ
sembly aside. Take care not to damage foam gasĆ
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 - Install the ignitor on the opposite side of the
burner from the metal button protrusions. Screws
that attached the ignitor bracket must be installed
from the same side as the ignitor and through the
bracket to engage in the smaller holes located in the
burner. The correct burner orientation is with metal
button protrusions always pointing up.
15 - Reinstall the burner ignitor assembly in the burner
box so that grommet groove fits back into sheet metĆ
al notch and makes a good seal. The burners sit on
top of the burner box flanges. Make certain that the
screws 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 panĆ
el screws. Make sure the foam gaskets are providing
a seal around each end of the gas manifold. All gas
orifices should be engaged. If at this point the burnĆ
ers were mounted in the wrong holes, this needs to
be corrected. The saddle brackets on the gas manĆ
ifold 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 form a sandwich
around the lip. Reinstall burner box cover.
18 - Reinstall the 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 - Reconnect gas valve wiring. Brown wire to HI yellow
wire to C and orange wire to M.
21 - Reinstall the 2Ćpin ignitor plug at the burner box. ReĆ
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 connecĆ
tion test procedures from installation manual.
25 - Replace upper access panel.
