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8406-068 OBSOLETE
- DIFF. PRESS. SW. .38" OPEN ON
The Bard 8406-068 differential pressure switch is an OEM safety and proving control used in Bard wall-mounted HVAC equipment to verify proper airflow or pressure before allowing the unit to operate. With a 0.38 inch water column open-on-rise setpoint, this switch helps prevent nuisance operation and protects key components by ensuring the system sees the correct pressure signal through its tubing connections. When troubleshooting pressure faults, lockouts, or intermittent operation, replacing a weak or drifting switch with the correct Bard 8406-068 is a straightforward way to restore dependable pressure sensing and proper sequencing, provided the ports, hoses, and venting are also clean and correctly routed.
Official replacement(s):
8406-078
- Diff. Press. Sw. .38" Open On Fall