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Bard part 8620-218 is an OEM Economizer Relay Kit used in Bard wall-mounted HVAC equipment to switch economizer-related low-voltage control signals so the outdoor air (free cooling) sequence operates correctly when commanded by the unit controls or an external controller. Replacing a failed or intermittent economizer relay can resolve issues like an economizer that will not enable, will not shut off, or causes inconsistent damper operation, helping restore proper ventilation and economizer function without modifying factory wiring. As a genuine Bard kit, 8620-218 is intended to match the original electrical and control requirements for compatible Bard economizer applications; confirm fit by matching the part number to your unit model and wiring diagram before installation.