Constructed with a stainless steel base plate and a durable aluminum cover

Simplified Field Integration: Standardized terminal blocks allow for efficient wiring and faster commissioning during HVAC troubleshooting

By choosing a genuine Nortek Global HVAC part

Integrated Pressure Taps: Includes 1/8" NPT taps for easy measurement of inlet and outlet pressures during commissioning

this switch ensures the burners cycle off if the internal plenum temperature exceeds safe operational thresholds

Lochinvar & A.O. Smith 100297134 Flame Sensor 320788-703 Constructed with a stainless steelThe Lochinvar & A. O. Smith 100297134 Flame Sensor is a critical genuine OEM replacement part engineered for precision flame rectification in high efficiency gas fired systems. Designed for use in Lochinvar boilers and A. O. Smith water heaters, this sensor monitors the burner flame to ensure the ignition control module receives a continuous microamp signal. If the flame signal is lost or carries high resistance, the system initiates a safety lockout