Lennox 23X17 Control Board 321894-708 Compatible with a broad range

Compatible with a broad range of non-corrosive refrigerants including R-22

Technical specs confirm its construction uses high-dielectric insulation to prevent voltage leakage and "ghost" signals that trip sensitive flame sensors

Once the temperature drops to the 250-degree Fahrenheit closing point

the installation of sump heater HTR15994 is necessary to manage refrigerant migration and ensure reliable startup

this is a direct-acting valve

Lennox 23X17 Control Board 321894-708 Compatible with a broad rangeThe Lennox 23X17 Control Board, also identified as the Lennox 620244 02, is an essential demand defrost control designed for high performance heat pump systems. Built to replace previous iterations such as the LEN620244 02, this board integrates multiple critical functions into a single 24V module, including demand defrost logic, a defrost relay, and an anti short cycle timed off control. It features a sophisticated pressure switch system lockout