Lennox 21L14 Controller 321894-706 Durable Bimetallic Construction: Provides long-cycle

Durable Bimetallic Construction: Provides long-cycle life and consistent switching reliability under varied thermal loads

this unit is the engineered successor to the 11B79-2

Infrared Sensitivity: Optimized for IR scanners to provide stable flame signals on problematic fuels or high-refractory environments

this drain pan tube offers superior corrosion resistance compared to standard plastic alternatives

Lennox 21L14 Controller 321894-706 Durable Bimetallic Construction: Provides long-cycleThe Lennox 21L14 Controller (catalog number 106855 01) is a critical M4 W4 CORE Unit Controller Replacement kit designed for high performance management of Lennox commercial rooftop units and split systems. As a genuine OEM Lennox HVAC control board, it functions as the primary logic module, processing multi sensor inputs to execute precise HVAC system sequencing, ignition timing, and blower motor coordination. This integrated furnace control is