Which of the following statements about converting a system from one refrigerant to another is incorrect ?
a. Synthetic and mineral oils are completely compatible.
b. A new metering device may be required.
c. Equipment capacity may change with the new refrigerant.
d. Gaskets and O-rings may have to be changed.
Question 2
If oil is not returning to the compressor, a possible cause is _____.
a. poorly designed refrigerant piping
b. oil viscosity
c. incorrect refrigerant type
d. that the oil is too miscible