| As shown in the illustrated typical self-contained refrigerant recovery unit, what is the purpose of the pump-down solenoid valve and the restricted orifice? |
| A) preparation for transitioning from the direct liquid recovery mode to the direct vapor recovery mode |
| B) preparation for transitioning from the direct vapor recovery mode to the direct liquid recovery mode |
| C) preparation for a recovery unit shutdown where the next job will be to recover a different type of refrigerant |
| D) preparation for a normal recovery unit shutdown where the next job will be to recover the same type of refrigerant |
