1" water column for exact system balancing

Common Questions & Technical Support What does "Open on Rise" mean for this switch

Compact M-Series Design: The reduced physical footprint allows for easier installation in crowded reach-in or countertop appliance control manifolds

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

To optimize heat transfer

Lennox 49W66 Control Board R-410A 1" water column for exactThe 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