Your recovery/recycling machine has r-22 refrigerant in it. you now have to recover refrigerant from a unit with r-410a. what must be done before your recovery unit can be used to recovery r-410a?
a) the recovery unit must be epa certified for use with r-410a. b) the recovery tank must be designed for the pressure of r-410a. c) the filter and lubricant in the recovery unit must be changed, and the recovery unit evacuatedd) all of the above