What are manometers specifically used for in HVAC?

Manometers are specifically designed to measure the pressure of gases by utilizing a liquid column, typically water or mercury, within a transparent tube. This device operates based on the hydrostatic pressure principle, where the height difference of the liquid column correlates directly to the pressure of the gas being measured. In HVAC applications, accurate pressure readings are critical for system diagnostics, performance evaluation, and to ensure that appliances operate safely and efficiently.

The other options do not align with the primary function of manometers. While temperature measurement, airflow direction, and system efficiency calculations are essential aspects of HVAC system analysis, they rely on different types of instruments. For instance, thermometers are used for temperature changes, anemometers determine airflow direction, and efficiency is often calculated through various metrics and performance indicators rather than pressure measurements by a manometer. Thus, understanding the specific utility of a manometer helps HVAC professionals reliably assess and manage gas pressures in their systems.