When should this plate be replaced

High Flow Capacity: Rated for systems up to 2000 CFM

Always verify the York replacement part number against your specific unit's data plate before installation

a complete burner lockout

Lennox 72L27 Thermostat 320735-701 When should this plate beThe Lennox 72L27 Defrost Thermostat is a critical safety and performance component designed for precise temperature regulation in Lennox heat pump systems. This heavy duty bimetal defrost sensor functions by monitoring coil temperatures and initiating the defrost cycle once frost accumulation reaches specific thresholds, typically closing at 42F and opening at 75F. Engineered for longevity in harsh outdoor environments, the 72L27 ensures the outdoor