Utica-Dunkirk 14662039 Thermocouple 30 Inch

The Utica-Dunkirk 14662039 is a 30-inch long thermocouple, a vital safety component in gas-fired HVAC equipment like furnaces and boilers. It works by converting heat into a small electrical voltage output (between 26 and 32 millivolts). The pilot flame heats the tip of the thermocouple, and the resulting temperature difference creates a millivolt signal. This signal is sent to the gas control valve, which keeps the gas valve open as long as the pilot is lit. If the pilot ever goes out, the thermocouple cools down, the voltage drops, and the gas control valve shuts off the gas supply to prevent leaks.