Which are signs that recovered refrigerant might be contaminated?

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Signs that recovered refrigerant might be contaminated include an unusual odor, a color change, the presence of moisture or other impurities, and abnormal pressures observed during testing or charging. An unusual odor or color change suggests that non-refrigerant substances or degraded lubricants have mixed with the refrigerant, altering its properties. Moisture or impurities can come from leaks or improper handling and will change the refrigerant's behavior, often leading to incorrect readings and performance issues. Abnormal pressures indicate the refrigerant’s composition isn’t within spec, which can result from contamination and affect system operation and recovery equipment.

Colder than expected ambient temperature isn’t a reliable indicator of contamination, as it can be caused by environmental conditions or system load. A smell like new plastic isn’t a typical sign of refrigerant contamination, and a slight metallic taste isn’t used as a practical or safe indicator in HVAC work.