Siemens DDC 540-378 AutoZero Module 321894-708 This valve features a 1-5/8"

This valve features a 1-5/8" mounting center

supporting both NO and NC logic in complex 24V control circuits

Keeping this field service kit in your truck ensures you can resolve PRV failures immediately

It is highly versatile

making it a versatile HVAC replacement part for contractors needing to restore system equilibrium without replacing the entire valve assembly

Siemens DDC 540-378 AutoZero Module 321894-708 This valve features a 1-5/8"The Siemens DDC 540 378 AutoZero Module is a high precision calibration component engineered for Siemens building automation systems. This module serves as the primary solution for mitigating sensor signal drift within analog input loops, ensuring that pressure and airflow transducers maintain a stable baseline. By automating the zero point adjustment, the 540 378 eliminates the need for frequent manual recalibration in VAV systems and air handling