What are the two evacuation methods commonly used?

The correct choice highlights the two commonly used evacuation methods as deep evacuation and triple evacuation.

Deep evacuation involves removing the maximum amount of refrigerant and moisture from the system, ensuring that any contaminants or moisture are eliminated. This method is particularly important when servicing systems that may have been exposed to non-condensables or have had leaks, as it helps restore the system to an optimal working condition by minimizing the risk of damage to the components.

Triple evacuation, on the other hand, takes the deep evacuation concept further by performing the evacuation process three times. This consists of vacuuming the system, then purging it with nitrogen to ensure all undesirable gases are displaced, and finally achieving a deep vacuum before closing the system. This thorough approach is crucial, especially in systems that have experienced severe issues or have been opened for extended periods.

Together, these two methods ensure that the HVAC system is functioning efficiently and extends its lifespan by adequately preparing it for service or refrigerant recharge.