What is the relationship between a rooftop unit and its refrigerant charge as it is shipped to the job site?

Rooftop units are typically designed to arrive at the job site with a factory-charged refrigerant. This means that the manufacturer has pre-filled the unit with the appropriate amount of refrigerant required for optimal performance and efficiency. The factory charging process ensures that the unit is ready to operate upon installation, which helps streamline the setup process for technicians and minimizes the chances of installation errors related to refrigerant levels.

By being factory-charged, the rooftop unit comes with the confidence that its refrigerant system has undergone quality control checks for the correct amount of refrigerant, which is crucial for the unit's performance. If a unit were shipped without refrigerant or with an insufficient amount, it could lead to inefficient cooling and potential system failures. While some variations may exist depending on the specific manufacturer or model, the standard practice remains that rooftop units generally arrive pre-charged, making option B the most accurate.