Lochinvar & A.O. Smith 100275527 Flue Sensor 321042-401 High-Altitude Compatibility: Designed to maintain

High-Altitude Compatibility: Designed to maintain accurate trip points in challenging venting environments

converting these readings into a precise 4

voltage should be verified against your specific controller (120V/60Hz is standard for the SN2 series)

Is the Danfoss 121L3277 a replacement for the 120U3277

Long-Term Reliability: Tested for over one million cycles with a replaceable ring packing design to extend the service life of the valve body

Lochinvar & A.O. Smith 100275527 Flue Sensor 321042-401 High-Altitude Compatibility: Designed to maintainThe Lochinvar & A. O. Smith 100275527 Flue Sensor with integrated grommet is a critical safety and monitoring component used across high efficiency condensing boilers and commercial water heaters. This negative temperature coefficient (NTC) thermistor provides real time flue gas temperature monitoring to the control board, ensuring the appliance operates within specified thermal limits and prevents heat exchanger damage. Designed as a direct