"These requirements cover nonelectrical refrigerant-containing components and accessories@ intended for field installation in accordance with the Safety Code for Mechanical Refrigeration@ ANSI/ASHRAE 15@ in refrigeration systems@ air conditioning equipment@ or both@ charged with the refrigerants identified for use in the component or accessory. The requirements also apply to components and accessories intended for use by manufacturers in factory-assembled systems or units@ in which case the component or accessory is also judged under the requirements for the individual system or unit. These requirements do not apply to: a) Electric valves and electric refrigeration controllers@ hermetic refrigerant motor-compressors@ tubing fittings such as flare or compression type fittings@ and the like@ which are covered in or as part of separate@ individual requirements. b) Electrical components of assemblies incorporating these refrigerant-containing components or accessories@ and c) Pressure vessels bearing the ASME Code ""U"" symbol which are within the Scope of the ASME Boiler and Pressure Vessel Code@ Section VIII."