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8406-056 OBSOLETE
- DIFF. PRES. SWH. .81" W.C. PF
Bard part number 8406-056 is an OEM differential pressure switch rated at 0.81 inches water column (W.C.) that is used to prove airflow or pressure in Bard wall mounted HVAC equipment. When the correct pressure is present, the switch contacts change state to allow the unit sequence to continue, helping prevent nuisance lockouts caused by weak draft, restricted airflow, or blocked tubing. This replacement is selected to match Bard performance requirements, but pressure switches are application specific, so confirm the setpoint and electrical connection style against your unit model and wiring diagram before ordering.
Official replacement(s):
8406-078
- Diff. Press. Sw. .38" Open On Fall