providing a reliable mechanical barrier in commercial and residential split systems

using this factory authorized part is preferred over field-fabricated jumpers to ensure HVAC system compatibility and high-performance signal integrity

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

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

featuring a mounting bracket type 6 and an aerated pilot design that provides non-linting operation to reduce nuisance service calls

York S1-7970-3281/A Limit Switch 320819-301 providing a reliable mechanical barrierThe 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