Know Your Refrigeration Stuff? Prove It. (And Then Come Sell It Like a Pro.) Quick-fire quiz for the sharp minds in refrigeration: Can you break down the role of a compressor, condenser, expansion valve, and evaporator in your sleep?Know the difference between scroll, screw, and reciprocating compressors and when to use each?What happens when non-condensables sneak into a system? Can you explain the click apply for full job ..... full job details .....