Lennox 10X87 Controller R 134A Utilizing genuine York service parts Utilizing genuine York service parts for terminal repairs preserves original equipment specifications and prevents the impedance issues often associated with generic aftermarket pigtails or spliced connections it features extended studs and a specific shaft length that meets or exceeds OEM specifications for standard 5 the C3 logic is capable of managing humidity levels when paired with the appropriate Lennox sensors and specialized configuration Enhanced System Efficiency: Maintains factory spec variable fan speed and airflow parameters to optimize performance