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8406-100 OBSOLETE
- Diff. Press. Sw. .73" Open On Fall
The Bard 8406-100 differential pressure switch is an OEM control component used to prove airflow by sensing a pressure difference in the unit, helping the system operate safely and reliably when the correct draft or airflow is present. This switch is set for 0.73 inches water column and is specified as open on fall, making it a common fit for Bard wall-mounted HVAC equipment that needs dependable airflow verification for proper sequence of operation. If you are troubleshooting nuisance shutdowns, filter-related airflow issues, or pressure-proving faults, replacing a worn or out-of-calibration switch with the correct Bard part number helps restore proper control logic and keeps your unit operating to factory specifications.
Official replacement(s):
8406-100BX
- Diff. Press. Sw. .73" - Boxed