critical for preventing heat exchanger fatigue and over-firing

Designed specifically as a natural gas pilot orifice with a 0

B—ensure broad compatibility

As a primary high limit control

Key Benefits for the Contractor: Thermal Protection: Rapidly drops steam temperature to form a protective condensate seal

Lennox 47K19 Defrost Sensor critical for preventing heat exchangerThe Lennox 47K19 Defrost Sensor is a critical OEM replacement part designed for high performance heat pump maintenance. Engineered for residential and commercial HVAC applications, this defrost tube thermostat monitors the temperature of the outdoor evaporator coil to prevent excessive ice accumulation. The 47K19 features a precise tube mount design that ensures accurate thermal feedback, initiating the defrost cycle by closing at 32 F and terminating