Red Seal Gasfitter — Class A Practice Exam

Why are manifold gauges used in gasfitting?

1. To monitor ambient temperature

2. To measure refrigerant pressures and diagnose issues in gas systems

3. To calibrate pressure sensors

4. To test for gas leaks

The correct answer is: To measure refrigerant pressures and diagnose issues in gas systems

Manifold gauges are essential tools in gasfitting because they are specifically designed to measure refrigerant pressures in systems and help diagnose issues related to gas intake or flow. By connecting to the service ports of a gas system, these gauges provide valuable readings of both the low- and high-side pressures, allowing a technician to assess the operational efficiency and identify any irregularities in the system's performance. This diagnostic capability is crucial for ensuring that gas systems operate safely and effectively. Monitoring refrigerant pressures helps in determining if the system is overcharged, undercharged, or has other issues that could lead to inefficiency or failure. The ability to accurately measure pressures ultimately aids in making informed decisions for system maintenance and repair, confirming the critical role that manifold gauges play in the gasfitting process.