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Lennox SL297NV Gas Furnace Yearly Maintenance

The Lennox SL297NV Gas Furnace Yearly Maintenance should only be performed by a licensed professional service technician (or equivalent).

MaintainX

04/26/2021

Lennox SL297NV Gas Furnace Yearly Maintenance

The Lennox SL297NV Gas Furnace Yearly Maintenance should only be performed by a licensed professional service technician (or equivalent).

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 service technician (or equivalent). D

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 maintenance could result in dangerous operation, serious injury, death,

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

Annually (before heating season) inspect furnace venting system, vent cap, heat exchanger, and burners for corrosion, deterioration, or deposits of debris. Remove any obstructions.

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 conduct a combustion analysis. The technician will also inspect the indoor blower, burner flames, electrical connections 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 injury or death.

Electrical

Check all wiring for loose connections.

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

Check amp-draw on the blower motor.

Motor Nameplate

Actual

Call your Lennox service technician if the unit will not operate. Before calling, always check the following to be sure service is required:

Check that electrical disconnect switches are ON.

Check room thermostat for proper setting.

Replace any blown fuses or reset circuit breakers.

Gas valve should be ON.

Air filter should not be plugged, which will limit air flow.

Is gas turned on at meter?

Is manual main shut-off valve open?

Record the model and serial number of the furnace. These numbers are on the unit nameplate, which is located on the blower deck below the combustion air inducer.

Serial Number

Model Number

Safety Precautions

If you discover any of the following, shut down your unit, and contact a Lennox dealer for an inspection by a licensed professional service technician (or equivalent).

If you repeatedly hear any new or unfamiliar sounds while your unit is operating, there may be a problem. For example, poorly performing burners can produce unfamiliar noises.

If you smell any unusual odors, your unit may be operating improperly. For example, units can give off unfamiliar odors if components are required to operate in abnormal conditions.

Look for visible signs of a malfunctioning unit. Examples include unusual amounts of condensate on windows inside your house, visibly burnt components or unusual dirt or rust accumulations on the vent pipe or in the unit.

If you experience headache, nausea, fatigue, or dizziness, the cause could be exposure to carbon monoxide gas. This is often misdiagnosed as the flu because symptoms are similar.

If you suffer from flu-like symptoms that are exaggerated at home, but seem to subside while you are away from the house, exposure to carbon monoxide could be the cause.

WARNING: Do not use this furnace if any part has been underwater. A flood-damaged furnace is extremely dangerous. Attempts to use the furnace can result in fire or explosion. Immediately call a licensed professional service technician (or equivalent) to i

Your vigilance may pay off in early detection of a problem before either personal injury or property damage occurs.

Do not hesitate to contact a qualified service technician as an investment in your well being.

Planned Service

At the beginning of each heating season, and to comply with the Lennox Limited Warranty, your system should be checked as follows by a licensed professional service technician (or equivalent).

Check wiring for loose connections, voltage at indoor unit and amperage of indoor motor.

Check the condition of the belt and shaft bearings if applicable.

Inspect all gas pipe and connections for leaks.

Check the cleanliness of filters and change if necessary (monthly).

Check the condition and cleanliness of burners and heat exchanger and clean if necessary.

Check the cleanliness of blower assembly and clean the housing, blower wheel and blower motor if necessary.

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

Inspect the rubber hoses connected to the pressure switches for cracks or loose connections, replace as necessary.

Remove the rubber hoses from the cold end header box and inspect for any blockage, clean as needed. If strainers are installed in the hoses remember to remove and clean before reinstalling the hoses.

Evaluate the heat exchanger integrity by inspecting the heat exchanger per the AHRI heat exchanger inspection procedure. This procedure can be viewed at www.ahrinet.org

Ensure sufficient combustion air is available to the furnace. Fresh air grilles and louvers (in the room where the furnace is installed) must be properly sized, open and unobstructed to provide combustion air.

Inspect the furnace intake and exhaust pipes to make sure they are in place, structurally sound, without holes, blockage or leakage and the exhaust pipe is sloped toward the furnace.

Inspect terminations to ensure they are free of obstructions and are structurally sound. Inspect the furnace return air duct connection to ensure the duct is sealed to the furnace

Check for air leaks on supply and return ducts and seal where necessary.

NOTE - After any heavy snow, ice or frozen fog event the furnace vent pipes may become restricted. Always check the vent system and remove any snow or ice that may be obstructing the plastic intake or exhaust pipes.

Inspect the furnace return air duct connection to ensure the duct is sealed to the furnace.

Check for air leaks on supply and return ducts and seal where necessary.

Check the condition of the furnace cabinet insulation and repair if necessary.

Perform a complete combustion analysis during the furnace inspection to ensure proper combustion and operation. Consult Service Literature for proper combustion values.

Verify operation of CO detectors and replace batteries as required.

Perform a general system test. Turn on the furnace to check operating functions such as the start-up and shut-off operation.

Check the operation of the ignition system, inspect and clean flame sensor.

Check microamps before and after.

Check controls and safety devices (gas valve, flame sensor, temperature limits).

Consult Service Manual for proper operating range. Thermal Limits should be checked by restricting airflow and not disconnecting the indoor blower. For additional details, please see Service and Application Note H049.

Verify that system total static pressure and airflow settings are within specific operating parameters.

Clock gas meter to ensure that the unit is operating at the specified firing rate for each stage of operation.

Check the supply pressure and the manifold pressure on both low fire and high fire. If manifold pressure adjustment is necessary, consult the Service Literature for unit specific information on adjusting gas pressure.

Not all gas valves are adjustable. Verify correct temperature rise.

CAUTION: As with any mechanical equipment, personal injury can result from contact with sharp sheet metal edges. Be careful when you handle this equipment.

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: SL297UH040NV36B. All service must be done by a licensed professional inst

Cabinet Parts

Upper access panel

Blower access panel

Top Cap

Control Panel Parts

Transformer

Integrated control

Door interlock switch

Blower Parts

Blower wheel

Motor

Motor mounting frame

Blower housing cutoff plate

Heating Parts

Flame Sensor

Heat exchanger assembly

Gas manifold

Combustion air inducer

Gas valve

Burner assembly

Pressure switch

Ignitor

Primary limit control

Rollout switches

Source: Lennox

Please note that any procedure, checklist, or other document available in the MaintainX Procedure Hub is provided for general education and information only and does not constitute legal, medical, or financial advice. MaintainX makes the materials available AS IS and AS PROVIDED, without warranties of any kind. By downloading or using any such materials, you assume the risk that they may not be appropriate for your specific situation and agree that you are solely responsible for any such use, including compliance with applicable law and with meeting any conditions of product warranties.

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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 service technician (or equivalent). D

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 maintenance could result in dangerous operation, serious injury, death,

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

Annually (before heating season) inspect furnace venting system, vent cap, heat exchanger, and burners for corrosion, deterioration, or deposits of debris. Remove any obstructions.

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 conduct a combustion analysis. The technician will also inspect the indoor blower, burner flames, electrical connections 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 injury or death.

Electrical

Check all wiring for loose connections.

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

Check amp-draw on the blower motor.

Motor Nameplate

Actual

Call your Lennox service technician if the unit will not operate. Before calling, always check the following to be sure service is required:

Check that electrical disconnect switches are ON.

Check room thermostat for proper setting.

Replace any blown fuses or reset circuit breakers.

Gas valve should be ON.

Air filter should not be plugged, which will limit air flow.

Is gas turned on at meter?

Is manual main shut-off valve open?

Record the model and serial number of the furnace. These numbers are on the unit nameplate, which is located on the blower deck below the combustion air inducer.

Serial Number

Model Number

Safety Precautions

If you discover any of the following, shut down your unit, and contact a Lennox dealer for an inspection by a licensed professional service technician (or equivalent).

If you repeatedly hear any new or unfamiliar sounds while your unit is operating, there may be a problem. For example, poorly performing burners can produce unfamiliar noises.

If you smell any unusual odors, your unit may be operating improperly. For example, units can give off unfamiliar odors if components are required to operate in abnormal conditions.

Look for visible signs of a malfunctioning unit. Examples include unusual amounts of condensate on windows inside your house, visibly burnt components or unusual dirt or rust accumulations on the vent pipe or in the unit.

If you experience headache, nausea, fatigue, or dizziness, the cause could be exposure to carbon monoxide gas. This is often misdiagnosed as the flu because symptoms are similar.

If you suffer from flu-like symptoms that are exaggerated at home, but seem to subside while you are away from the house, exposure to carbon monoxide could be the cause.

WARNING: Do not use this furnace if any part has been underwater. A flood-damaged furnace is extremely dangerous. Attempts to use the furnace can result in fire or explosion. Immediately call a licensed professional service technician (or equivalent) to i

Your vigilance may pay off in early detection of a problem before either personal injury or property damage occurs.

Do not hesitate to contact a qualified service technician as an investment in your well being.

Planned Service

At the beginning of each heating season, and to comply with the Lennox Limited Warranty, your system should be checked as follows by a licensed professional service technician (or equivalent).

Check wiring for loose connections, voltage at indoor unit and amperage of indoor motor.

Check the condition of the belt and shaft bearings if applicable.

Inspect all gas pipe and connections for leaks.

Check the cleanliness of filters and change if necessary (monthly).

Check the condition and cleanliness of burners and heat exchanger and clean if necessary.

Check the cleanliness of blower assembly and clean the housing, blower wheel and blower motor if necessary.

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

Inspect the rubber hoses connected to the pressure switches for cracks or loose connections, replace as necessary.

Remove the rubber hoses from the cold end header box and inspect for any blockage, clean as needed. If strainers are installed in the hoses remember to remove and clean before re­installing the hoses.

Evaluate the heat exchanger integrity by inspecting the heat exchanger per the AHRI heat exchanger inspection procedure. This procedure can be viewed at www.ahrinet.org

Ensure sufficient combustion air is available to the furnace. Fresh air grilles and louvers (in the room where the furnace is installed) must be properly sized, open and unobstructed to provide combustion air.

Inspect the furnace intake and exhaust pipes to make sure they are in place, structurally sound, without holes, blockage or leakage and the exhaust pipe is sloped toward the furnace.

Inspect terminations to ensure they are free of obstructions and are structurally sound. Inspect the furnace return air duct connection to ensure the duct is sealed to the furnace

Check for air leaks on supply and return ducts and seal where necessary.

NOTE - After any heavy snow, ice or frozen fog event the furnace vent pipes may become restricted. Always check the vent system and remove any snow or ice that may be obstructing the plastic intake or exhaust pipes.

Inspect the furnace return air duct connection to ensure the duct is sealed to the furnace.

Check for air leaks on supply and return ducts and seal where necessary.

Check the condition of the furnace cabinet insulation and repair if necessary.

Perform a complete combustion analysis during the furnace inspection to ensure proper combustion and operation. Consult Service Literature for proper combustion values.

Verify operation of CO detectors and replace batteries as required.

Perform a general system test. Turn on the furnace to check operating functions such as the start-up and shut-off operation.

Check the operation of the ignition system, inspect and clean flame sensor.

Check microamps before and after.

Check controls and safety devices (gas valve, flame sensor, temperature limits).

Consult Service Manual for proper operating range. Thermal Limits should be checked by restricting airflow and not disconnecting the indoor blower. For additional details, please see Service and Application Note H­04­9.

Verify that system total static pressure and airflow settings are within specific operating parameters.

Clock gas meter to ensure that the unit is operating at the specified firing rate for each stage of operation.

Check the supply pressure and the manifold pressure on both low fire and high fire. If manifold pressure adjustment is necessary, consult the Service Literature for unit specific information on adjusting gas pressure.

Not all gas valves are adjustable. Verify correct temperature rise.

CAUTION: As with any mechanical equipment, personal injury can result from contact with sharp sheet metal edges. Be careful when you handle this equipment.

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: SL297UH040NV36B. All service must be done by a licensed professional inst

Cabinet Parts

Upper access panel

Blower access panel

Top Cap

Control Panel Parts

Transformer

Remove the rubber hoses from the cold end header box and inspect for any blockage, clean as needed. If strainers are installed in the hoses remember to remove and clean before reinstalling the hoses.

Consult Service Manual for proper operating range. Thermal Limits should be checked by restricting airflow and not disconnecting the indoor blower. For additional details, please see Service and Application Note H049.