Lennox ML196DF045XE36B Manual 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.
Page 47