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Bard part 8406-102 is an OEM air pressure (draft) switch set to 0.28 in. w.c. with a tolerance of plus or minus 0.05, designed to open on a falling pressure signal to help protect the unit when airflow or venting conditions are not correct. In Bard wall-mount HVAC equipment, this switch is commonly used as a safety proving device that works with the control circuit to prevent unsafe operation if the required pressure is not maintained. For a trouble-free repair, match the rating and wiring connections exactly and confirm the correct part number by unit model and serial before ordering.
* Orders less than $50 may incure a minimum order fee.