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8406-070 OBSOLETE
- DIFF. PRESS. SW. .73" OPEN ON
Bard 8406-070 is an OEM differential pressure switch set to open on a 0.73 inch water column change, used to prove proper airflow and pressure conditions before allowing the unit to operate. On Bard wall mounted equipment, this type of switch helps protect the system by preventing operation when airflow is restricted or the draft/air movement being monitored is not within specification, which can help avoid nuisance trips and safety lockouts. Replace a weak or out of calibration switch with the correct Bard part number to maintain factory intended sequencing, and always confirm the WC rating and tubing/port connections match your unit’s parts list before ordering.
Official replacement(s):
8406-100
- Diff. Press. Sw. .73" Open On Fall