Which instrument is used to measure refrigerant pressures in an HVAC system?

The manifold gauge set is the correct instrument used to measure refrigerant pressures in an HVAC system. This set typically consists of two gauges: one for measuring high-side pressure and the other for low-side pressure. These gauges allow technicians to determine the operational pressures within the refrigerant cycle, which is crucial for diagnosing system performance, charging refrigerants, and ensuring efficient operation.

The manifold gauge set is specifically designed for refrigerant systems, providing accurate readings that can help identify issues such as overcharging, undercharging, or system leaks. In contrast, a thermometer measures temperature, a multimeter is used for electrical measurements like voltage and resistance, and a vacuum pump is utilized for creating a vacuum in the system before charging it with refrigerant. Each of these tools plays a different role in HVAC maintenance, but the manifold gauge set is essential for monitoring refrigerant pressures.