York 3400-3151 Limit Switch it provides the mechanical flexibility

it provides the mechanical flexibility required to translate actuator torque into reliable blade positioning

Smith ProLine series equipment

01-inch square footprint provides a stable mounting surface that resists warping under thermal stress

While this is a standard LP orifice

Built for high-capacity applications

York 3400-3151 Limit Switch it provides the mechanical flexibilityThe York S1 3400 3151 Limit Switch is a critical safety component designed for high limit thermal protection in residential and commercial HVAC systems. This OEM replacement part is engineered to monitor furnace plenum temperatures, specifically calibrated with an open point of 175F and a close point of 125F. As an automatic reset limit switch, it eliminates the need for manual intervention once temperatures return to safe operating parameters.