(1)Scope. The application of 522 CMR 9.00 is intended to ensure the safe design, construction, installation, operation, and inspection of every refrigeration and air conditioning system that comes within scope of M.G.L. c. 146, § 45A.(2)Purpose. The purpose of 522 CMR 9.00 is to provide reasonable safety for life, limb, health, and property by adopting such rules and regulations in accordance with nationally recognized standards of engineering practice which will properly influence future progress and development in refrigeration and air conditioning systems.(3)Requirements. The requirements of 522 CMR 9.00 shall apply to all refrigeration and air conditioning systems and appurtenances that come within the scope of M.G.L. c. 146, § 45A excluding the following:(a) Systems in railway trains;(b) Systems in motor vehicles;(c) Systems in private residences;(d) Systems in apartment houses of less than five apartments;(e) Systems under the jurisdiction of the United States;(f) Agricultural, horticultural or floricultural purposes; and(g) Systems having less than 20 tons capacity.(4)Field Inspections. All First Inspections shall be performed by an Authorized Inspector or a District Engineering Inspector before the refrigeration and air conditioning systems are put into service. Field inspections of refrigeration and air conditioning systems in Massachusetts shall be made annually thereafter by a District Engineering Inspector or an Authorized Inspector.Amended by Mass Register Issue 1321, eff. 9/9/2016.Amended by Mass Register Issue 1458, eff. 12/10/2021.