5°F to 16°F normal range

Key Benefits OEM Cross-Compatibility: Directly replaces thousands of original equipment relays

Professionals rely on this furnace safety limit switch for its rugged construction and reliable calibration within the combustion chamber environment

What is the purpose of the 1 to 30 degree F offset

Lennox 49W66 Control Board R-410A 5°F to 16°F normal rangeThe Lennox 49W66 Ignition Control Board is the heavy duty OEM replacement for legacy 790 311 and 102186 01 modules. Designed for direct spark ignition (DSI) systems, this 24VAC control board is a critical integrated component for Lennox GCS16 rooftop units and commercial series. It features a 30 second pre purge cycle and an 8 second ignition trial, providing precise timing to ensure safe combustion. As a veteran grade HVAC replacement part, it