Lennox XC21: Maintenance

At the beginning of each cooling season, the system should be checked as follows:

• Clean and inspect outdoor coil (may be flushed with a water hose). Ensure power is off before cleaning.

• Outdoor unit fan motor is factory-lubricated and sealed. No further lubrication is needed.

• Visually inspect all connecting lines, joints and coils for evidence of oil leaks.

• Check all wiring for loose connections.

• Check for correct voltage at unit (unit operating).

• Check amp draw on outdoor fan motor.

• Inspect drain holes in coil compartment base and clean if necessary

Indoor Unit

• Clean or change filters.

• Lennox blower motors are pre-lubricated and permanently sealed. No more lubrication is needed.

• Adjust blower speed for cooling. Measure the pressure drop over the coil to determine the correct blower CFM. Refer to the unit information service manual for pressure drop tables and procedure.

• Belt Drive Blowers - Check belt for wear and proper tension.

• Check all wiring for loose connections.

• Check for correct voltage at unit. (blower operating)

• Check amp draw on blower motor.

Indoor Coil

• Clean coil if necessary.

• Check connecting lines, joints and coil for evidence of oil leaks.

• Check condensate line and clean if necessary.

The outdoor unit must be properly maintained to ensure its proper operation.

• Outdoor Coil — The outdoor coil may be flushed with a water hose.

• Outdoor Coil (Coastal Area) — Moist air in ocean locations can carry salt, which is corrosive to most metal. Units that are located near the ocean require frequent inspections and maintenance. These inspections will determine the necessary need to wash the unit including the outdoor coil. Consult your installing contractor for proper intervals/procedures for your geographic area or service contract.