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18-28-1107.7  Stop valves.
   All systems containing more than 6.6 pounds (3 kg) of a refrigerant in systems using positive-displacement compressors, shall have stop valves installed at the inlet of each compressor, compressor unit or condensing unit.
   Exceptions:
      1.   Systems that have a refrigerant pump out function capable of storing the entire refrigerant charge in a receiver or heat exchanger.
      2.   Systems that are equipped with provisions for pump out of the refrigerant using either portable or permanently installed recovery equipment.
      3.   Self-contained systems.