KMC Controls VTD-9422 Diaphragm the switch should be normally

the switch should be normally closed

This 195F 80F differential switch is essential for maintaining equipment integrity and ensuring your system meets original manufacturer specifications during routine HVAC safety switch troubleshooting or emergency repairs

Is this switch for the burner or the fan

While this is a York S1-025-26392-012

What is the difference between the 4074EDC and 4074EDC/U

KMC Controls VTD-9422 Diaphragm the switch should be normallyThe KMC Controls VTD 9422 is a critical replacement diaphragm specifically engineered for 2 inch pneumatic actuators. This genuine OEM component is designed to restore the seal and peak operational efficiency of damper actuators and valve assemblies within pneumatic HVAC systems. Constructed from high grade, flexible rubber building materials, the VTD 9422 diaphragm provides the necessary resilience to handle repeated cycling and pressure fluctuations