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3 - Clock gas meter to ensure that the unit is operating
at the specied ring rate. Check the supply
pressure and the manifold pressure. On two-stage
gas furnaces check the manifold pressure on high
re and low re. If manifold pressure adjustment is
necessary, consult the Service Literature for unit
specic information on adjusting gas pressure.
Not all gas valves are adjustable. Verify correct
temperature rise.
Pay attention to your furnace. Situations can arise be-
tween annual furnace inspections that may result in un-
safe operation. For instance, items innocently stored next
to the furnace may obstruct the combustion air supply.
This could cause incomplete combustion and the produc-
tion of carbon monoxide gas.
Repair Parts List
The following repair parts are available through Lennox dealers. When ordering parts, include the complete furnace mod-
el number listed on the CSA International nameplate -- Example: ML180UH045V36A. All service must be done by a
licensed professional installer (or equivalent), a service agency, or the gas supplier.
Cabinet Parts
Upper access panel
Blower access panel
Top Cap
Control Panel Parts
Transformer
Integrated control
Door interlock switch
Circuit Breaker
Blower Parts
Blower wheel
Motor
Motor mounting frame
Motor power choke (3/4 and 1 hp)
Blower housing cut-o 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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