Lubrication

123456789101112
Across
  1. 5. The reverse of hydrolysis – combining organic acid and alcohol to form POE and water
  2. 6. (AB) Older synthetic oil compatible with CFC/HCFC and mineral oil (rarely used today)
  3. 8. The chemical breakdown of a compound when it reacts with water (POE turns into acids and alcohol)
  4. 9. Point The temperature at which waxy materials separate from oil and refrigerant mixture (can clog metering devices)
  5. 10. The ability of oil to absorb moisture from the air
  6. 11. Ether (PVE) Alternative to POE, more hygroscopic than POE but does not undergo hydrolysis
  7. 12. Point The temperature at which the lubricant becomes semi-solid and loses its flow characteristics
Down
  1. 1. Glycol (PAG) Most common oil in automotive A/C, extremely hygroscopic, conducts electricity
  2. 2. Oil Non-synthetic oil made from crude oil distillation (breakdown products stay soluble in the oil)
  3. 3. Point The temperature at which the oil’s vapour can be momentarily ignited by a flame (flame goes out when heat source is removed)
  4. 4. (POE) Synthetic oil used with HFC refrigerants, made from carboxylic acid and alcohol, contains no wax
  5. 7. The ability of oil to mix with refrigerant (needed for oil return in hydrocarbon systems)