When is a manifold gauge set used?

A manifold gauge set is a crucial tool in HVAC (Heating, Ventilation, and Air Conditioning) services that can be used for multiple functions regarding refrigerants. The primary purposes of the manifold gauge set include discharging, charging, and evacuating systems.

When charging a system, the manifold gauge set allows technicians to connect to the refrigerant lines, measure pressure, and ensure that the correct amount of refrigerant is added to the system. This is vital for ensuring efficient operation and proper cooling capacity.

During evacuating, the manifold gauge set is used to create a vacuum inside the refrigerant lines and the system. This process removes any moisture or contaminants that could harm the system's performance. The gauges help monitor the levels of vacuum to ensure they reach the desired specifications.

For discharging, the manifold gauge set enables technicians to safely remove refrigerant from the system. This is necessary when servicing or disposing of old units, as proper refrigerant handling is essential for environmental compliance and safety.

Given these various applications, it is clear why the manifold gauge set is versatile and integral to multiple aspects of HVAC work, making the choice of "all answers are correct" accurate.