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The Bard 8408-038 Freeze Protect Thermostat is an OEM low temperature safety control used on Bard wall mount and heat pump equipment to help prevent freeze related damage by monitoring coil or cabinet temperatures and signaling the unit controls to protect the system when conditions get too cold. This is the correct choice when you are replacing a failed or intermittent freeze stat, especially in applications that see cold outdoor air or low load operation where coil icing can occur. As with any control component, confirm the exact part number and wiring location in your Bard service literature or unit wiring diagram before ordering, since this thermostat has known superseding replacements depending on the model and revision.