York S1-373-03481-717 Flame Wire Sensor 18AWG

The York S1-373-03481-717 Flame Wire Sensor 18AWG is a widely used component in many HVAC systems and its role is to sense a flame. This sensor is standard in gas-fired furnaces, boilers, and other combustion appliances, and is instrumental in advancing the safety as well as efficiency of these appliances. The sensor operates by periodically measuring the electric conductivity of a wire inserted into the combustion chamber. When the flame exists, these areas ionize the zone air, therefore raising electrical conductivity between the sensor wire and the grounded electrode. This variation in conductivity is picked by the control system to assert the presence of a stable flame.