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The Bard 8620-294 Enthalpy Sensor Kit is an OEM control accessory used on Bard wall mount and packaged equipment with economizer ventilation to help the controller evaluate outdoor air conditions for free cooling decisions. When an enthalpy sensor is drifting, damaged, or intermittently reading, economizer operation can become unreliable, causing poor ventilation control or missed economizer hours. Installing the correct Bard OEM kit helps restore proper sensor feedback to the economizer control so the unit can bring in outdoor air when conditions are suitable and lock out economizer operation when they are not. Confirm compatibility by matching the part number to your unit model and economizer control type before ordering.