Question

The use of Refrigerant $R-22$ for temperature below $-{30}^{\circ }C$ is not recommended due to its

• A. Good miscibility with lubricating oil
• B. Poor miscibility with lubricating oil
• C. Low evaporating temperature
• D. High compressor discharge temperature

Answer 1

The correct option is B Poor miscibility with lubricating oil

$R-22$ has a limit upto which it is miscible with lubricating oil.And it's miscibility reduces as temperature goes down
So Refrigerant $R-22$ is not recommended with very low temperature.