🔍 Key Concepts

• Refrigerant recovery during maintenance • Effect of temperature on pressure in a closed system (refrigeration cycle basics) • How changing temperature of the appliance or recovery cylinder changes refrigerant movement

💭 Think About

• Think about what happens to the pressure of a gas when you heat the container it is in versus when you cool it. • Which part do you want at a higher pressure and which at a lower pressure so refrigerant will naturally flow faster toward the recovery vessel? • How would chilling the recovery vessel versus heating the appliance affect the pressure difference between them?

✅ Before You Answer

• Review the relationship: increased temperature → increased pressure in a closed refrigerant system. • Consider whether greater pressure difference between the appliance and the recovery cylinder speeds up refrigerant flow. • Check if both actions (cooling one side and heating the other) work in the same direction or oppose each other in terms of moving refrigerant.