To ensure an air-to-air heat exchanger is working properly, regular maintenance needs to be performed. The maintenance schedule will depend on the particular unit installed; refer to the owner’s manual for specific instructions.
Make sure the power to the unit is off before performing any maintenance. Begin with the filters. Clean or change the filters every 1-3 months, depending on the manufacturer’s recommendations. Washable filters should be cleaned by following the manufacturer’s recommendations.
When changing the filters, vacuum the area surrounding the filters. After cleaning the filters, check the outside air intakes to ensure nothing is blocking the screens and hoods. Inspect the condensation pan, and drain tubing. To be certain nothing is blocking the tubing, pour some water into the pan near the drain. If the water does not drain, the tubing will need to be cleaned.
Clean the heat exchanger core at least once each year. Make sure to follow the instructions in the owner's manual on the proper cleaning and maintenance of the core. Again, ensure the power is off before performing any maintenance. In addition to the core, the fans should be cleaned at least once each year. Wipe the blades clean, and oil the motor only if recommended by the manufacturer. Ask a heating, cooling, and ventilation professional to perform the maintenance if you are unsure of the process or cannot do the maintenance yourself.
Additional Related Information
Air-to-Air Heat Exchangers for Healthier Energy Efficient Homes
Why is Home Ventilation a Concern
Air-to-Air Exchanger Operation and Construction
