12V DC Brushless Central Air Conditioning Water Drainage Pump The central air conditioning drainage pump uses a float switch in the drain pan to detect the condensate water level. When the water reaches a preset height, the motor automatically activates to drive the impeller and pump the water out through the drain line, then shuts off once the water level drops — operating in a continuous automatic cycle. This 12V dc central air conditioning water drainage pump is designed for effective condensate drainage in ceiling cassette and central air conditioning systems. Its smart features and compact design deliver reliable performance and ease of installation, making it a valuable solution for HVAC professionals.