To improve the efficiency of recovery during a system flush, what is the recommended method?

Applying heat to the compressor is a recommended method for improving the efficiency of recovery during a system flush because it helps to vaporize the refrigerant more effectively. When heat is applied to the compressor, it increases the temperature of the refrigerant, which in turn lowers its density and enhances its ability to evaporate and be recovered. This approach can facilitate a more efficient recovery process, as the refrigerant can transition from a liquid to a vapor state more readily, allowing for better suction and recovery rates.

In the context of system flushes, ensuring that the refrigerant moves through the system as vapor not only aids in quicker recovery but can also help in the removal of contaminants and oils from the system. This results in a more thorough flush, ensuring that the system is clean before recharging. This method is particularly effective when dealing with certain types of refrigerants that respond well to increased temperatures.

Other recovery methods presented, such as running a vacuum, using hot water, or utilizing a low-pressure recovery system, might not achieve the same level of efficiency and effectiveness in vaporizing the refrigerant compared to applying heat directly to the compressor during the recovery process.