(True or False) Recover, recycle and reclaim are the only three legal ways refrigerant can be...

(True or False) Recover, recycle and reclaim are the only three legal ways refrigerant can be removed from an A/C or refrigeration system

Expert Solution

True :Recover, recycle and reclaim are the only three legal ways refrigerant can be removed from an A/C or refrigeration system

Types of Recovery Schemes:

The key to a quick recovery procedure is to get the liquid out first, then get the remaining vapor out. There are three different ways to remove refrigerant from the system: push-pull recovery; liquid recovery; and vapor recovery (the most common).

• Push-pull: This is a method of removing bulk liquid from a system using the pressure differential created by the recovery machine. It is commonly used on systems with a receiver tank; those with greater than 20 pounds of refrigerant; or when transferring refrigerant from one tank to another. Push-pull generally does not work on smaller systems, because there is no bulk liquid reservoir from which to create a siphon.

Before getting started using the push-pull recovery method, make sure the system doesn’t have a reversing valve that will not allow a solid column of liquid to form, and that it doesn’t have an accumulator. If either of these components exists within the system, the push-pull method cannot be used. You will need to use the liquid or vapor recovery method.

• Liquid recovery: With the advent of oil-less compressors and constant-pressure regulator valves, liquid recovery has become the preferred method, recommended by most recovery equipment manufacturers. Liquid recovery is performed the same way as standard vapor recovery. The only difference is that you connect to the high side of the system. Recovering liquid is ideal for recovering large amounts of refrigerant, such as when you transfer refrigerant, or if the system you are servicing allows you to recover liquid.

After completing the transfer of liquid refrigerant between a recovery unit and a refrigeration system, avoid trapping liquid refrigerant between the service valves.

• Vapor recovery: Vapor is drawn from the refrigeration unit into the recovery system. It passes through the compressor to the condenser, where cooling occurs. Once cooled to a sufficient temperature, the gas turns to liquid and proceeds into the storage tank. Refrigerant recovery systems operate on a temperature-pressure relationship. A lower temperature facilitates a lower pressure, therefore allowing for faster and more efficient operation.

Vapor recovery can be approximately 75-80 percent of the entire recovery process. So it’s important to use a recovery machine with a high vapor recovery rate, in addition to being good at recovering vapor at high temperatures.

Manojponduru answered 2 years ago

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