while the included straight connector simplifies the installation process for field technicians

are calibrated to match original factory performance curves

this valve ensures stable modulation and tight shut-off in demanding hydronic applications

this unit provides 70 lb-in torque (8 Nm)

providing a reliable mechanical barrier in commercial and residential split systems

York S1-7970-3281/A Limit Switch 320819-301 while the included straight connectorThe 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