Engine: Refrigeration AC

1. A refrigerators, freezers, room air conditioners and central air conditioners
2. B systems manufactured and hermetically sealed having a capacity of five pounds (2.27 kg) or less of refrigerant
3. C any appliance charged with less than two pounds (0.91 kg) of refrigerant
4. D any appliance charged with less than ten pounds (4.54 kg) of refrigerant

Tip: press A-D to answer