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The Bard 8407-069 transformer is an OEM control power transformer used in Bard wall mounted packaged HVAC equipment to step down incoming high voltage to 24VAC for the unit’s low voltage controls. Rated at 50VA with a 400/480V primary and 24VAC secondary, it helps provide stable power for components like contactors, relays, and control boards so the system can operate reliably. If your unit has lost 24-volt control power or shows symptoms tied to a failing transformer, replacing it with the correct Bard 8407-069 is the best way to restore proper control voltage and maintain factory-correct fit and wiring compatibility.