Assessment: The technician first assesses the system to determine if there’s a need for a gas charge. This might involve checking the pressure levels in the system and inspecting for any leaks.

Leak Detection: If the refrigerant level is low, the technician will check for leaks in the system. Common areas for leaks include the outdoor and indoor units, as well as the connecting pipes.

Repair (if necessary): If leaks are detected, the technician will repair them before proceeding with the gas charge. This might involve replacing damaged pipes, tightening connections, or applying sealants.

Evacuation: Before adding new refrigerant gas, the technician evacuates any existing gas from the system using a vacuum pump. This removes any air and moisture that may have entered the system, ensuring optimal performance.

Charging: Once the system is evacuated, the technician adds the appropriate amount of refrigerant gas to the system according to the manufacturer’s specifications. This is typically done using a charging hose connected to the outdoor unit’s service valve.

Pressure Testing: After adding the refrigerant, the technician checks the pressure levels in the system to ensure they are within the recommended range.

Testing: Finally, the technician tests the system to ensure it’s cooling properly and that there are no further issues.