Lennox ML193UHE Series Unit Information page 48

40 - Secure burner assembly to vestibule panel using
four existing screws. Burners are self aligning to
center of clam shells.
41 - Reconnect gas supply line to gas valve.
42 - Reconnect flame roll-out switch wires.
43 - Reconnect sensor wire and reconnect 2-pin plug
from ignitor.
44 - Reconnect wires to gas valve.
45 - Replace the blower compartment access panel.
46 - Refer to instruction on verifying gas and electrical
connections when re-establishing supplies.
47 - 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.
48 - Replace heating compartment access panel.
Cleaning the Burner Assembly
1 - Turn off gas and electrical power to the furnace.
Remove heating compartment access panel.
2 - Disconnect the gas supply line from the gas valve.
3 - Disconnect and label wires from gas valve.
4 - Disconnect ignitor wiring at 2 circuit plug.
5 - Disconnect and label wires from rollout switch.
6 - Disconnect and label flame sensor wire.
7 - Disconnect and label ground wire from burner/
manifold assembly.
8 - Remove four screws that secures burner/manifold
assembly to vestibule. Remove the assembly and
make note not to allow ignitor plate to dislodge from
the assembly.
9 - Gently clean the face of the burners using the soft
brush attachment on a vacuum cleaner. Visually
inspect the inside of the burners and crossovers for
any blockage caused by foreign matter. Remove
any blockage
10 - Reinstall the burner/manifold assembly using the
existing four screws. Burners are self aligning to
center of clam shells.
11 - Reconnect ground wire.
12 - Reconnect flame sensor wire.
13 - Reconnect rollout switch wires.
14 - Reconnect ignitor wires.
15 - Reconnect gas valve wires.
16 - Reconnect gas supply line to gas valve.
17 - Refer to instructions on verifying gas and electrical
connections when re-establishing supplies.
18 - Follow instructions to place furnace in operation.
Run furnace 5 minutes to ensure burners are clean
and operating correctly.
19 - Replace heating compartment access panel.
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