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The Bard CMA-28 Low Ambient Control Kit is an OEM fan cycling control used on select Bard wall mounted packaged air conditioners to help maintain stable cooling operation when outdoor temperatures drop. This control cycles the condenser fan based on refrigerant pressure so the system can keep proper head pressure in cooler weather, which helps reduce nuisance low pressure issues and supports reliable cooling during shoulder season or low ambient applications. If you are replacing a failed low ambient control or adding low ambient capability to a compatible R-410A Bard unit, CMA-28 is the correct factory style component to restore proper condenser fan control and cold weather cooling performance. Confirm compatibility by matching the part number and checking your unit model and wiring diagram before ordering.