SC Refrigeration Practice Questions - South Carolina Refrigeration Contractor Examination Exam

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A technician wants to add a few pounds of a different ASHRAE 34 refrigerant blend into an existing circuit to 'top it off.' What does IMC 1102.2.1 require?

Any A1 refrigerants may be mixed freely Refrigerants with different ASHRAE 34 designations shall not be mixed, except where the equipment manufacturer permits a specified second refrigerant to improve oil return Mixing is allowed if the blend GWP is lower than the original charge Mixing is allowed after the system is evacuated to 500 microns

Correct Answer:

Refrigerants with different ASHRAE 34 designations shall not be mixed, except where the equipment manufacturer permits a specified second refrigerant to improve oil return

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