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8406-079 OBSOLETE
- Diff. Press. Sw. .63" Open On Fall
Bard part number 8406-079 is an OEM differential pressure switch set to 0.63 inches water column, designed to open on a falling pressure condition to help the unit prove proper airflow before allowing operation to continue. On Bard wall mounted HVAC equipment, this type of switch is commonly used as a safety and control input that reacts when airflow drops due to issues like a restricted filter, blower performance problems, or venting/air path restrictions, helping protect the system from nuisance shutdowns and unsafe operating conditions. Because pressure switch ratings and port orientation are application-specific, confirm 8406-079 against the unit model and wiring diagram before ordering to ensure correct setpoint and proper operation.
Official replacement(s):
8406-079BX
- Diff. Press. Sw. .63" Open On Fall