HVAC plumbing issues can occur in both the heating and cooling seasons. In winter, high-efficiency, two-stage furnaces produce condensation in the heating process. During summer, however, it’s the central air conditioner that generates the most condensation and the greatest potential for HVAC plumbing issues.
Condensation forms as warm, moist indoor air flows through the AC evaporator coil inside the indoor air handler. During hot summer weather, a typical air conditioner produces between 5 and 20 gallons of condensate daily. Water from the coil drips into the condensate drain pan that's installed beneath the air handler, then flows into a household drain line. In some installations, a condensate pump removes water from the drain pan.
Condensate-Drainage Issues
Plumbing issues caused by condensate may originate at several points in the air-conditioning process:
A crack or hole in the condensate drain pan
A clogged drain line, often caused by algae or mold growth originating in the drain pan, which causes the pan to overflow
A defective condensate pump
Coil Icing
Icing forming in the AC evaporator coil reduces system airflow and may eventually trigger an automatic system shutdown. Ice accumulation often extends outside the coil. As melting occurs when the system shuts down, water may not be contained by the pan, causing water damage around the indoor air handler.
Preventing HVAC Plumbing Issues
To minimize the potential for water damage due to plumbing issues, take these preventive measures:
Schedule annual professional maintenance by a qualified HVAC contractor. This service includes checking proper function of the AC drain components, including the condensate drain pan and drain line. If mold or algae growth is causing clogs, the pan and drain line can be cleaned and treated with germicidal solutions to kill mold and algae, as well as prevent recurrence.
Resolve causes of evaporator-coil icing. These include maintaining proper system airflow with regular monthly air-filter replacement. Because low refrigerant charge may also trigger coil ice, annual AC preventive maintenance, including checking and verifying the refrigerant level, is also recommended.
For more advice about HVAC plumbing issues, contact the professionals at Air Assurance.
