Lennox International Inc SL280DFV manual Filters, Maintenance, Service Reminder

Turning Off Gas to the Unit

1 − Set the thermostat to the lowest setting.

2 − Turn off all electrical power to the unit if service is to be performed.

3 − Remove the upper access panel.

4 − Move switch on gas valve to OFF. Do not force. 5 − Replace the access panel.

Filters

SL280DFV filters are installed external to the unit. Filters should be inspected monthly. Clean or replace the filters when necessary to ensure that the furnace operates prop- erly. Replacement filters must be rated for high velocity air- flow. Table 1 lists recommended filter sizes.

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)

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 venting system to make sure it is in place, physically sound and without holes, corrosion, or blockage. The vent connector must be correctly posi- tioned and sloped upward. The vent connector must be physically sound, without holes or excessive corrosion.

Inspect the furnace return air duct connection. The duct must be sealed to the furnace and it must terminate outside the space containing the furnace.

Inspect the physical support of the furnace to guarantee that it is sound. The support must not sag and must not have cracks or gaps around the base of the furnace. There must be a seal between the furnace base and the support. During a seasonal check, the service technician will in- spect the indoor blower and the burner flames along with the venting system.

Blower

Check blower wheel for any debris and clean it, if neces- sary. The blower motor is pre−lubricated for extended bear- ing 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.

Service Reminder

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

1 − Check that electrical disconnect switches are ON.

2 − Check room thermostat for proper setting.

3 − Replace any blown fuses or reset circuit breakers.

4 − Gas valve should be ON.

5 − Air filter should not be plugged, which will limit air flow. 6 − Is gas turned on at meter?

7 − 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 below the burners.

Serial Number ________________________________

Model Number ________________________________

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