Lennox EL296UHE Series Unit Information page 52

45 - Reconnect gas supply piping. Turn on power and
gas supply to unit.
46 - Follow lighting instructions on unit nameplate to
light and operate furnace for 5 minutes to ensure
the furnace is operating properly.
47 - Check all piping connections, factory and field, for
gas leaks. Use a leak detecting solution or other
preferred means.
48 - Replace heating compartment access panel.
CAUTION
Some soaps used for leak detection are corrosive
to certain metals. Carefully rinse piping thoroughly
after leak test has been completed. Do not use
matches, candles, flame or other sources of ignition
to check for gas leaks.
Cleaning the Burner Assembly (if needed)
1 - 1 - Turn off electrical and gas power supplies to
furnace. Remove upper and lower furnace access
panels.
2 - Disconnect the wires from the gas valve.
3 - Remove the burner box cover (if equipped).
4 - Disconnect the gas supply line from the gas valve.
Remove gas valve/manifold assembly.
5 - Mark and disconnect sensor wire from the sensor.
Disconnect wires from flame rollout switches.
6 - Disconnect combustion air intake pipe. It may be
necessary to cut the existing pipe to remove burner
box assembly.
7 - Remove four screws which secure burner box
assembly to vest panel. Remove burner box from
the unit.
8 - 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 blockage caused by foreign matter. Remove
any blockage.
9 - Reinstall the burner box assembly using the existing
four screws. Make sure that the burners line up in
the center of the burner ports.
10 - Reconnect the sensor wire and reconnect the 2-pin
plug to the ignitor wiring harness. Reconnect wires
to flame rollout switches.
11 - Reinstall the gas valve manifold assembly.
Reconnect the gas supply line to the gas valve.
Reinstall the burner box cover.
12 - Reconnect wires to gas valve.
13 - Replace the blower compartment access panel.
14 - Refer to instruction on verifying gas and electrical
connections when re-establishing supplies.
15 - Follow lighting instructions to light and operate
furnace for 5 minutes to ensure that heat exchanger
is clean and dry and that furnace is operating
properly.
16 - Replace heating compartment access panel.
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