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8406-069 OBSOLETE
- Diff. Press. Sw. .63" Open On Fall
Bard part 8406-069 is an OEM differential pressure switch set to open on a falling pressure differential at 0.63 inches water column, commonly used as an airflow proving or safety input in Bard commercial HVAC equipment where the control system needs to confirm proper air movement across key components. When this switch drifts out of calibration or fails to change state, the unit can lock out, alarm, or operate unreliably, so replacing it with the correct Bard factory part helps restore proper control logic and protect the system. Match the electrical terminals and tubing connections to your existing switch, and verify the setpoint and sequence against the unit wiring diagram or service manual before startup.
Official replacement(s):
8406-079
- Diff. Press. Sw. .63" Open On Fall