Lennox 47K19 Defrost Sensor Common Questions: How often should

Common Questions: How often should I clean the Bunn 28122 air filter

Can this cover be used for vertical installations

meaning both power legs are disconnected when the coil is de-energized

For technicians performing routine maintenance or troubleshooting Reznor gas-fired unit heaters

For veteran technicians and building automation contractors

Lennox 47K19 Defrost Sensor Common Questions: How often shouldThe 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