Lennox International Inc LENOX GAS FURNACE, ML180UH manual Filters, Maintenance

Filters

All ML180UH filters are installed external to the unit. Fil- ters should be inspected monthly. Clean or replace the fil- ters when necessary to ensure proper furnace operation. Replacement filters must be rated for high velocity airflow. Table 1 lists recommended filter sizes.

A filter must be in place when the unit is operating.

TABLE 1

Furnace	Filter Size
Cabinet Width	Side Return	Bottom Return
14−1/2"	16 X 25 X 1 (1)	14 X 25 X 1 (1)
17−1/2"	16 X 25 X 1 (1)	16 X 25 X 1 (1)
21"	16 X 25 X 1 (1)	20 X 25 X 1 (1)
24−1/2"	16 X 25 X 1 (2)	24 X 25 X 1 (1)

Maintenance

A licensed professional service technician (or equivalent) should inspect the complete system each season (heating and cooling). The following maintenance procedures should only be conducted by a licensed professional ser- vice technician (or equivalent). Do not attempt to service

the unit in any way.

WARNING

ELECTRICAL SHOCK, FIRE,

OR EXPLOSION HAZARD.

Failure to follow safety warnings exactly could result in dangerous operation, serious injury, death or property damage.

Improper servicing could result in dangerous opera- tion, serious injury, death, or property damage. Before servicing, disconnect all electrical power to furnace.

When servicing controls, label all wires prior to dis- connecting. Take care to reconnect wires correctly. Verify proper operation after servicing.

Venting System

WARNING

Asphyxiation Hazard

The exhaust vent for this furnace must be leak−free and must be securely connected to the furnace flue collar at all times.

For your safety and to fulfill the terms of the limited warranty, a licensed professional service technician (or equivalent) must annually inspect this furnace and its vent system.

Annually (before heating season) inspect furnace venting system, vent cap, heat exchanger, and burners for corro- sion, deterioration, or deposits of debris. Remove any ob- structions.

Inspect the furnace for obvious signs of deterioration. Inspect the furnace venting system to make sure it is in place, physically sound, and without holes, corrosion, or blockage.

Vent pipe must be clear and free of obstructions and must slope upward away from the furnace.

Inspect the furnace return air duct connection to ensure duct is sealed to the furnace and terminates outside the space containing the furnace.

Inspect the physical support of the furnace to guarantee that it is sound without sagging, cracks or gaps around base and it maintains seal between base and support.

Inspect the condensate drain and trap for leaks and cracks. The drain and trap must also be cleaned and the trap must be filled with water.

During a seasonal check the service technician will con- duct a combustion analysis. The technician will also in- spect the indoor blower, burner flames, electrical connec- tions and the venting system.

Blower

Check the blower wheel for debris and clean if necessary. The blower motors are prelubricated for extended bearing life. No further lubrication is needed.

WARNING

The blower access panel must be securely in place when the blower and burners are operating. Gas fumes, which could contain carbon monoxide, can be drawn into living space resulting in personal inju- ry or death.

Burner Flame

CAUTION

To ensure proper operation, a licensed professional service technician (or equivalent) should check the burner flame and conduct a combustion analysis annually.

Electrical

1 − Check all wiring for loose connections.

2 − Check for the correct voltage at the furnace (furnace operating).

3 − Check amp−draw on the blower motor.

Motor Nameplate__________Actual__________

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