NV C-21 Refrigeration And Air Conditioning Practice Questions - Nevada C-21 Refrigeration And Air Conditioning Contractor Examination Exam

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Per UMC 2018 Chapter 11, a positive-displacement C-21 system containing more than 6.6 pounds of refrigerant shall have stop valves:

Only at the liquid-receiver drain Nowhere; stop valves are prohibited on refrigerant lines Only on the condenser water piping At the inlet and discharge of each compressor, compressor unit, or condensing unit, and at each liquid receiver (with listed exceptions)

Correct Answer:

At the inlet and discharge of each compressor, compressor unit, or condensing unit, and at each liquid receiver (with listed exceptions)

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