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Bard 8406-091 is an OEM pressure switch set to open on a fall at 0.35 in. w.c. plus or minus 0.03, used as a safety and operating control in Bard HVAC equipment to prove proper system conditions before allowing continued operation. When the monitored pressure drops below the setpoint, the switch changes state to help prevent nuisance operation and protect key components, which is especially important on wall-mounted units that see airflow restrictions, icing conditions, or venting issues depending on application. If you are replacing a failed switch, match the part number and setpoint exactly and verify hose or tubing routing and electrical connections so the control reacts correctly under load.
* Orders less than $50 may incure a minimum order fee.