What is the first step in refrigerant removal from a low-pressure system?

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Multiple Choice

What is the first step in refrigerant removal from a low-pressure system?

Explanation:
Starting with liquid removal is most effective because, on the low-pressure side, the refrigerant in the system is a mix of liquid and vapor, and the liquid portion is easier to recover in one go. By pulling out the liquid first, you maximize the amount recovered and reduce the amount that would flash into vapor inside the recovery equipment. After the liquid is removed, the remaining refrigerant is mainly vapor and can be recovered as gas. Removing only gas at the outset would leave the liquid behind and waste refrigerant, so liquid removal is the best first step.

Starting with liquid removal is most effective because, on the low-pressure side, the refrigerant in the system is a mix of liquid and vapor, and the liquid portion is easier to recover in one go. By pulling out the liquid first, you maximize the amount recovered and reduce the amount that would flash into vapor inside the recovery equipment. After the liquid is removed, the remaining refrigerant is mainly vapor and can be recovered as gas. Removing only gas at the outset would leave the liquid behind and waste refrigerant, so liquid removal is the best first step.

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