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2010 Lennox Industries Inc.
Dallas, Texas, USA
506525−01
11/2010
ML180UH
Supersedes 08/2010
SERIES
GAS FURNACE
Litho U.S.A.
WARNING
FIRE OR EXPLOSION HAZARD.
Failure to follow safety warnings exact-
ly could result in serious injury, death,
or property damage.
WHAT TO DO IF YOU SMELL GAS:
Do not store or use gasoline or other
Do not try to light any appliance.
flammable vapors and liquids in the
Do not touch any electrical switch; do not
vicinity of this or any other ap-
use any phone in y
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ML180UH Parts Identification TOP CAP HEAT EXCHANGER ASSEMBLY PRESSURE SWITCH COMBUSTION AIR INDUCER UPPER ACCESS PANEL GAS VALVE AND MANIFOLD BURNERS BLOWER MOTOR INTEGRATED BLOWER ACCESS CONTROL PANEL FIGURE 1 NOTE − This manual is the property of the homeowner eration must be checked periodically. If this is not possible, and must be left with the equipment user. the water supply to the house should be shut off and the pipes should be drained. This will prevent problems associ- Notice to Homeo
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2 − After any heavy snow, ice or frozen fog event, the fur- nace vent pipes may become restricted. Always check CAUTION the vent system and remove any snow or ice that may Before attempting to perform any service or mainte- be obstructing the plastic intake or exhaust pipes. nance, turn the electrical power to unit OFF at the 3 − DO NOT obstruct air flow to unit. Unit must receive an disconnect switch. unobstructed flow of combustion and ventilating air. DO NOT block or obstruct air openings o
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Operating the Gas Valve (Figure 2) and maintained. However, the unit’s performance can be greatly impacted by the individual installation and the op- 1 − STOP! Read the safety information at the beginning of erating environment. It is your responsibility to ensure that this section. this appliance is maintained. Proper maintenance is criti- 2 − Set the thermostat to the lowest setting. cal for your safety and the satisfactory operation of the 3 − Turn off all electrical power to the unit. prod
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Annually (before heating season) inspect furnace venting Filters system, vent cap, heat exchanger, and burners for corro- All ML180UH filters are installed external to the unit. Fil- sion, deterioration, or deposits of debris. Remove any ob- ters should be inspected monthly. Clean or replace the fil- structions. ters when necessary to ensure proper furnace operation. Inspect the furnace for obvious signs of deterioration. Replacement filters must be rated for high velocity airflow. Inspect the f
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Your vigilance may pay off in early detection of a problem Service Reminder before either personal injury or property damage occurs. Call your Lennox service technician if the unit will not oper- Do not hesitate to contact a qualified service technician as ate. Before calling, always check the following to be sure an investment in your well being. service is required: Planned Service 1 − Check that electrical disconnect switches are ON. 2 − Check room thermostat for proper setting. You should
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Repair Parts List The following repair parts are available through Lennox dealers. When ordering parts, include the complete furnace model number listed on the CSA International nameplate −− Example: ML180UH045P36A. All service must be done by a li- censed professional installer (or equivalent), a service agency, or the gas supplier. Cabinet Parts Heating Parts Upper access panel Flame Sensor Blower access panel Heat exchanger assembly Top Cap Gas manifold Control Panel Parts Combustion air indu
