Lennox XC25 – Maintenance

Outdoor Unit
Maintenance and service must be performed by a qualified installer or service agency. At the beginning of each cooling season, the system should be checked as follows:

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

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

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

4. Check all wiring for loose connections.

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

6. Check amp draw on outdoor fan motor.

7. Inspect drain holes in coil compartment base and clean if necessary.

NOTE – If insufficient heating or cooling occurs, the unit should be gauged and refrigerant charge should be checked.

Outdoor Coil
It may be necessary to flush the outdoor coil more fre­quently if it is exposed to substances which are corrosive or which block airflow across the coil (e.g., pet urine, cotton­ wood seeds, fertilizers, fluids that may contain high levels of corrosive chemicals such as salts)
– 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.

Indoor Unit
1. Clean or change filters.

2. Lennox blower motors are factory-lubricated and per­manently sealed. No more lubrication is needed.

3. 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.

4. Check all wiring for loose connections.

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

6. Check amp draw on blower motor.

Indoor Coil
1. Clean coil if necessary.

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

3. Check condensate line and clean if necessary.

Locations with Possibility of Heavy Snow or Freezing Rain Accumulation
Heavy snow and/or freezing rain can interfere with the per­formance of the outdoor fan assembly. Lennox recommends use of the optional snow guard (X8782) in these areas.