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Bard part number S8407-069 is an OEM control transformer used in Bard wall mounted HVAC equipment to step down incoming high voltage (460/400V primary, depending on unit configuration) to a 24VAC control supply rated at 50VA. It is the right choice when you are troubleshooting low voltage issues such as intermittent contactor pull in, control board resets, or no 24V to the thermostat and safety circuit, and you need a factory matched transformer designed to fit and wire correctly in the original electrical compartment. As with any transformer replacement, confirm the unit nameplate voltage and verify primary tap selection and secondary output before returning the system to service.