What does a triple evacuation require?

A triple evacuation process requires evacuating the system to a level of 28 inches of mercury and charging it to 0 psig three times. This procedure helps ensure that any moisture, contaminants, or air within the refrigeration system are thoroughly removed.

The purpose of the initial evacuation to 28 inches of mercury is to create a vacuum that allows water vapor or other non-condensable gases to be effectively drawn out of the system. The subsequent charging to 0 psig removes any residual pressure, which aids in any further moisture removal during repeated evacuation cycles. By repeating this process three times, the technician enhances the thoroughness of the evacuation, which is essential for the reliable and efficient performance of the refrigeration system, especially when it comes to preventing issues like corrosion or freezing.

This method is particularly important in systems where moisture control is critical, as water can lead to long-term damage and reduced efficiency. Hence, going through the triple evacuation guarantees a cleaner and more stable environment for the refrigerant after the charging phase.