Page 47
38 - Reinstall gas valve manifold assembly. Reconnect
gas supply line to gas valve.
39 - Reinstall burner box cover if equipped.
40 - Reconnect plug to gas valve.
41 - Replace the blower compartment access panel.
42 - Follow lighting instructions on unit nameplate to light
and operate furnace for 5 minutes to ensure the fur
nace is operating properly.
43- Check all piping connections, factory and field, for gas
leaks. Use a leak detecting solution or other preferred
means.
CAUTION
Some soaps used for leak detection are corrosive to
certain metals. Carefully rinse piping thoroughly af
ter leak test has been completed. Do not use
matches, candles, flame or other sources of ignition
to check for gas leaks.
44 - Replace access panel.
Cleaning the Burner Assembly (if needed)
1 - Turn off electrical and gas power supplies to furnace.
Remove upper and lower furnace access panels.
2 - Disconnect the 2-pin plug from the gas valve.
3 - Remove the burner box cover (if equipped).
4 - Disconnect the gas supply line from the gas valve. Re
move gas valve/manifold assembly.
5 - -Loosen clamps and remove combustion air intake
flexible connector (if equipped).
5 - Mark and disconnect sensor wire from the sensor. Dis
connect plug from the ignitor at the burner box.
6 - Remove four screws which secure burner box assem
bly to vest panel. Remove burner box from the unit.
7 - Use the soft brush attachment on a vacuum cleaner to
gently clean the face of the burners. Visually inspect
the inside of the burners and crossovers for any block
age caused by foreign matter. Remove any blockage.
8 - Reinstall the burner box assembly using the existing
four screws. Make sure that the burners line up in the
center of the burner ports.
9 - Reconnect the sensor wire and reconnect the 2-pin
plug to the ignitor wiring harness.
10 - Reinstall combustion air intake flexible connector (if
equipped), secure using existing clamps.
11 - Reinstall the gas valve manifold assembly. Reconnect
the gas supply line to the gas valve. Reinstall the burn
er box cover.
12 - Reconnect plug to gas valve.
13 - Replace the blower compartment access panel.
14 - Refer to instruction on verifying gas and electrical con
nections when re-establishing supplies.
15 - Follow lighting instructions to light and operate fur
nace for 5 minutes to ensure that heat exchanger is
clean and dry and that furnace is operating properly.
16 - Replace access panel.
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