A central air system uses the same ductwork, fan, and controls as the forced-air furnace, so some of the maintenance requirements are the same.
A qualified service technician should also:
Inside unit
- Inspect and clean evaporator coil, drain pan, and condensate drain lines
- Inspect control box, wiring, and connections for wear or damage
- Ensure insulation on tubing is intact
Outside unit
- Inspect for proper refrigerant level
- Clean dirt, leaves, and debris from inside cabinet
- Inspect base pan for restricted drain openings-remove obstructions as necessary
- Inspect coil and cabinet-clean as needed
- Inspect fan motor and fan blades for wear and damage-on older models lubricate as needed
- Inspect control box, wiring, and connections for wear or damage
- Inspect compressor and tubing for damage
- Ensure penetrations through the house are properly sealed
Additional Recommendation
Additionally, there are many things that home owners can do to keep their air conditioners operating efficiently and safely:
- As with the furnace, air filters need to be changed per manufacturer’s recommendations. Restricted airflow can cause evaporator coil to freeze up, reducing efficiency and potentially damaging components.
- The area around the outside unit must be kept free of foliage or anything that can block airflow to the unit.
- The coils of the outside unit can get clogged from leaves, dust, or other debris, thus reducing efficiency. Periodically spraying with a hose can ensure proper operation.
- Window units require filters to be cleaned, drain lines to be clear and held away from siding, and proper sealing between the window and the unit.
- Ductless and high velocity systems also have filters that need cleaning or replacing.
FREQUENTLY ASKED QUESTIONS
Inspecting and cleaning the evaporator coil is crucial because a dirty coil can reduce airflow, increase energy consumption, and even cause the compressor to fail. A clean coil ensures efficient heat transfer, reduces the risk of frost buildup, and helps maintain the overall performance of the air conditioner. It’s recommended to clean the coil annually, or as needed, depending on the usage and environmental conditions.
Failing to inspect control box wiring and connections can lead to electrical issues, such as short circuits, overheating, or even fires. Worn or damaged connections can also cause the air conditioner to malfunction, resulting in reduced performance, increased energy consumption, or complete system failure. Regular inspection and maintenance of control box wiring and connections can help prevent these issues and ensure safe and reliable operation.
The refrigerant level in an air conditioner has a direct impact on its performance and efficiency. Low refrigerant levels can cause the compressor to work harder, leading to increased energy consumption, reduced cooling capacity, and even compressor failure. Conversely, overcharging can also lead to reduced performance and efficiency. It’s essential to inspect the refrigerant level regularly and adjust it as necessary to ensure optimal performance and prevent damage to the equipment.
Cleaning dirt, leaves, and debris from the outside unit of an air conditioner is essential to ensure proper airflow and heat transfer. A clean unit allows for efficient heat dissipation, reduces the risk of overheating, and helps maintain the overall performance of the air conditioner. Additionally, cleaning the outside unit can also help prevent rust and corrosion, extending the lifespan of the equipment.
Inspecting the base pan of an air conditioner for restricted drain openings is crucial to prevent water accumulation, which can lead to rust, corrosion, and even electrical issues. Restricted drain openings can cause water to accumulate in the base pan, leading to premature equipment failure. Regular inspection and cleaning of the base pan can help prevent these issues and ensure safe and reliable operation of the air conditioner.
