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Bard part number 8407-034 is an OEM control transformer designed to step down 208/240V to 24V with a 40VA rating, providing the low-voltage power your Bard wall-mounted HVAC unit needs for dependable operation of controls like contactors and relays. This transformer is a direct-fit replacement intended to restore stable 24V control power when the original transformer is weak, noisy, or failed; confirm your unit model and wiring connections match the factory configuration before installation.