Lennox EL16XC1: Maintenance

Your heating and air conditioning system should be inspected and maintained yearly (before the start of the cooling and heating seasons) by a licensed professional HVAC technician. You can expect the technician to check the following items. These checks may only be conducted by a licensed professional HVAC technician.

Inspect component wiring for loose, worn or damaged connections. Also check for any rubbing or pinching of wires. Confirm proper voltage plus amperage of outdoor unit.
Check the cleanliness of outdoor fan and blade assemblies. Check condition of fan blades (cracks). Clean or replace them, if necessary.
Inspect base pan drains for debris and clean as necessary
Inspect the condition of refrigerant piping and confirm that pipes are not rubbing copper-to-copper. Also, check the condition of the insulation on the refrigerant lines. Repair, correct, or replace as necessary.
Test capacitor. Replace as necessary.
Inspect contactor contacts for pitting or burn marks. Replace as necessary
Check outdoor fan motor for worn bearings/bushings. Replace as necessary
Inspect and clean outdoor coils, if necessary and note any damage to coils or signs of leakage

Inspect component wiring for loose, worn or damaged connections. Confirm proper voltage plus amperage indoor unit.
Inspect and clean or replace air filters in indoor unit.
Check the cleanliness of indoor blower and clean blower, if necessary.
Inspect the evaporator coil (Indoor) drain pans and condensate drains for rust, debris, obstructions, leaks or cracks. Pour water in pans to confirm proper drainage from the pan through to the outlet of the pipe. Clean or replace as necessary.
Inspect and clean evaporator (indoor) coil, if necessary.
Inspect the condition of the refrigerant lines and confirm that pipes are not rubbing copper-to-copper. Also, ensure that refrigerant pipes are not being affected by indoor air contamination. Check condition of insulation on the refrigerant lines. Repair, correct, or replace as necessary.
Inspect the duct system for leaks or other problems. Repair or replace as necessary.
Check for bearing/bushing wear on indoor blower motor. Replace as necessary.
Indoor unit inspections of gas- or oil-fired furnaces will also include inspection and cleaning of the burners, and a full inspection of the gas valve, heat exchanger and flue (exhaust) system.

Your technician should perform a general system test. He will turn on the air conditioner to check operating functions such as the startup and shutoff operation. He will also check for unusual noises or odors, and measure indoor/outdoor temperatures and system pressures as needed.
The technician will check the refrigerant charge per the charging sticker information on the outdoor unit.
Verify that system total static pressure and airflow settings are within specific operating parameters.
Verify correct temperature drop across indoor coil.