ACCA’s Quality Maintenance of Commercial Refrigeration Systems Standard is an ANSI-recognized standard that establishes a minimum maintenance program for the assessment and maintenance of commercial refrigeration equipment found in supermarkets, convenience stores, food service, and warehouses operating with saturated suction temperatures between -40F and +40F. Developed by a broad coalition of industry stakeholders, the QMref Standard identifies consensus requirements associated with maintenance of commercial refrigeration systems. While ACCA currently makes our quality standards available for free download, we retain all rights to the works. They may not be redistributed without our consent.