How Gas Furnace Thermocouples Work | HVAC Heating
How Gas Furnace Thermocouples Work | Boilers and Furnaces. Furnaces, water heaters, and boilers, especially older gas systems use the standing pilot gas system as an integral part of the furnace’s operation. These systems are best recognized as having a standing flame burning continuously.
It is a basic and time-tested system that provides a reliable way of proving a flame. It employs a thermocouple (some systems can use a thermophile which is a lot of thermocouples embedded in one piece) and a gas valve that has two separate valves inside of it.
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