Lennox 56K85 Control Board 321702-401 Featuring a robust brass body

Featuring a robust brass body and reliable EPDM diaphragm

Integrated auxiliary switch (SPDT) for precise end-of-stroke feedback and system sequencing

This model features a 1-1/8 inch ODF solder connection and a 9/16 inch port diameter

or sluggish response times during pressure changes

Precision Thermal Monitoring: Utilizes a high-accuracy 10K Ohm thermistor to provide real-time temperature feedback for precise system regulation

Lennox 56K85 Control Board 321702-401 Featuring a robust brass bodyThe Lennox 56K85 is a critical Integrated Modular Control (IMC) board designed specifically for managing the secondary gas valve in multi stage heating systems. This OEM Lennox replacement board (part number 56K85) serves as the Gas Vlv #2 control module, ensuring precise sequencing and timing for combustion cycles in heavy duty commercial rooftop units and high capacity furnaces. Built to withstand the thermal stresses of the cabinet environment, the