Oklahoma Service Technician Practice Exam

The pressure gauge is the essential tool used to check the refrigerant charge in an HVAC system because it measures the pressure of the refrigerant inside the system. By connecting the pressure gauge to the service ports of the system, technicians can determine the suction and discharge pressures. These readings help assess whether the refrigerant levels are adequate, which is crucial for the system’s efficiency and performance.

Understanding the pressures allows technicians to diagnose potential issues related to the refrigerant, such as overcharging or undercharging, which can lead to inefficient operation or damage to the system. The pressure readings can also provide insights on the overall health of the HVAC system and are often compared against manufacturer specifications to ensure proper functioning. This is why a pressure gauge is an indispensable tool for HVAC technicians when dealing with refrigerants.