The Beverage Air 502-070A fan thermostat monitors temperature conditions within compatible commercial refrigerators and controls fan operation according to the equipment's design. Its temperature-responsive switching function works within the refrigeration control circuit to manage the connected fan as operating conditions change. Purple and yellow leads identify the wiring configurat... https://partsfe.com/thermostat-fan-for-beverage-air-part-502-070a/1-502-070A.html