The Bryant 556A Quantum Plus is a discontinued central air conditioner with an efficiency of 14 SEER. It used a scroll compressor, and high- and low-level switches protected the unit from significant changes in operating pressure. A liquid line filter drier with up to four times the capacity of standard driers was included for protection from contaminants and moisture and to extend the life of the system. Accessible service valves and a large access panel allowed improved serviceability, while a galvanized steel cabinet with powder paint finish provided protection from the elements. The 556A Quantum Plus used Puron refrigerant.
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