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The Bard 8201-159 is an OEM pilot duty DPDT relay with a 24 volt coil used in Bard wall mounted HVAC equipment to switch low voltage control signals reliably within the unit control panel. This relay is commonly applied in control functions such as blower and lockout or safety related circuits depending on the specific model and wiring diagram, so replacing it with the correct Bard part helps restore proper sequencing and dependable system operation. Confirm DPDT contact arrangement and coil voltage match your existing relay and verify application by model and serial number or the unit parts list before ordering.