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8406-057 OBSOLETE
- DIFF. PRES. SW. 1.04" W.C. PF
Bard part number 8406-057 is an OEM differential pressure switch set for 1.04 in. w.c., used to prove proper airflow or draft in Bard wall-mounted HVAC equipment before allowing the system to operate. This switch helps protect key components by opening or closing its contacts when the correct pressure difference is present, which supports reliable starts and prevents nuisance shutdowns caused by restricted filters, blocked intakes, or venting issues. For best results, confirm the required setpoint and tubing/port orientation against your Bard unit’s parts list or service manual before ordering, since pressure switch ratings and wiring styles can vary by model and revision.
Official replacement(s):
8406-080
- Diff. Press. Sw. .73" Open On Fall