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Winterizing and Condensate Trap Care
1 - Turn o power to the furnace.
2 - Have a shallow pan ready to empty condensate
water.
3 - Remove the clean out cap from the condensate trap
and empty water. Inspect the trap then reinstall the
clean out cap.
Cleaning the Burner Assembly
1 - Turn o 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 ame 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 ame 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.
Repair Parts List
The following repair parts are available through Lennox
dealers. When ordering parts, include the complete fur-
nace model number listed on the CSA nameplate -- Ex-
ample: ML193UH045XE36B-01. All service must be
performed by a licensed professional installer (or
equivalent), service agency, or gas supplier.
Cabinet Parts
Upper access panel
Blower access panel
Top Cap
Control Panel Parts
Transformer
Integrated control board
Door interlock switch
Blower Parts
Blower wheel
Motor
Motor mounting frame
Motor capacitor
Blower housing cuto plate
Heating Parts
Flame Sensor
Heat exchanger assembly
Gas manifold
Combustion air inducer
Gas valve
Main burner cluster
Main burner orices
Pressure switch
Ignitor
Primary limit control
Flame rollout switches
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