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FIGURE 43
Simplified Burner Removal:
1− Remove cover by loosening bot
tom screws (2) and removing
cover front screws (5).
2− Remove ignitor wire and sensor
wire. Remove gas valve and
manifold assembly.
3− Remove burner assembly.
2
3
1
PATCH PLATE
BARBED PRESSURE
SWITCH FITTINGS
BURNER MOUNTING
BRACKET
PATCH PLATE
UNIT VEST PANEL
30− Reinstall the burner box. Tighten the screws holding
the support bracket. It is important that the glass fiber
gasket not be damaged so it will provide a continuous
seal between the burner box and the vestibule panel.
31− Reconnect pressure switch tubing by connecting the
tubing from the burner box to the barb on the bottom
and the tubing from the combustion air blower to the
barb on the top. See figure 18.
Note−G32−75 units will have two pressure switches.
32− Reconnect the sensor and ignitor wires.
33− Reinstall top cap to unit.
34− Reinstall electrical connections to gas valve. Brown
wire to H1, yellow wire to C2 and orange wire to M. Re
connect wires to flame rollout switch.
NOTE − Unit is polaritysensitive. 120V supply wiring
must be installed correctly.
35− Reconnect main gas line to gas valve.
36− Reinstall field makeup 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 to burner box with screws.
39− Replace both upper and lower access panels.
40− Refer to instruction on verifying gas and electrical con
nections when reestablishing supply.
41− Following lighting instructions from installation manu
al, light and run unit for 5 minutes to ensure heat ex
changer is clean, dry and operating safely.
Cleaning the Burner Assembly
NOTE − Surgical mask and safety glasses should be
worn when cleaning heat exchanger and burners.
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 (5) screws from edges of burner box cov
er.
4 − Loosen two (2) 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 gas valve wires and disconnect them from valve.
7 − Mark and disconnect sensor wire from the burner box
at the SureLight control. Disconnect 2pin plug from
the ignitor at the burner box.
8 − Loosen two (2) 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 assembly aside.
Take care not to damage foam gaskets on each end of
the gas manifold.
10− Using a 1/4" nut driver, remove the burner mounting
screws from underneath the burners.
11− While supporting ignitor and sensor lines at the grom
met, grasp burners and simultaneously pull burners
and grommet out of the burner box.
12− Remove ignitor and sensor assemblies from burners
using a 1/4" nut driver to remove two screws from each
bracket.
13− Clean burner by running a vacuum with a soft brush at
tachment over face of burners. Visually inspect inside of
burners and crossovers for any blockage caused by for
eign matter. Remove any blockage.