Reznor 121866 Thermal Switch refer to your specific model’s

refer to your specific model’s parts list for secondary fitting requirements

For contractors managing 2 psi or higher inlet pressure applications

the 8402-065 is the direct technical successor to the 8402-048

Engineerd by Johnson Controls for York

ensuring stable performance across the 24V coil

Reznor 121866 Thermal Switch refer to your specific model’sFor veteran contractors servicing industrial heating equipment, the Reznor 121866 Thermal Switch is a critical OEM component designed for high precision fan control and limit protection. This F190 30F thermal thermostat is engineered to monitor internal cabinet temperatures, ensuring the blower activates only when the heat exchanger reaches an optimal 190F. By deactivating the blower once temperatures drop below 30F, this switch prevents the