Bard 9043-139 - 0.21 in. w.c. Pressure Switch

Bard part 9043-139 is an OEM low pressure switch rated at 0.21 in. w.c. (Bard reference 2074961) used as a safety proving device to confirm proper airflow or draft conditions before the unit is allowed to operate. When the switch does not make correctly at its designed setpoint, the equipment may lock out or trip safety diagnostics, so replacing it with the correct Bard-calibrated switch helps restore normal, reliable operation. Verify the setpoint and wiring or tubing connections match your unit’s service literature, since pressure switches are application-specific by model and revision.

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