Drop-in Replacement: Directly replaces the Johnson Controls CP-2511 with identical mounting footprint and port logic

facilitating communication between the sensors and the firing mechanism

Is the BLW1321 compatible with systems using the legacy BLW0572

are calibrated to match original factory performance curves

York S1-7970-3281/A Limit Switch 320819-301 Drop-in Replacement: Directly replaces theThe York S1 7970 3281 A Limit Switch is a critical safety component designed for precise thermal monitoring in residential and light commercial HVAC systems. This high limit cutout switch features a 145F Open (FOP) and 115F Close (FCLS) configuration, ensuring the furnace heat exchanger remains within safe operating parameters. Acting as a normally closed thermal disc, the S1 7970 3281 A interrupts the burner circuit if airflow is restricted or