What does a reading of 354.7 psia signify in HVAC?

A reading of 354.7 psia indicates an absolute pressure reading. In HVAC terminology, absolute pressure is measured relative to a perfect vacuum, meaning that it includes atmospheric pressure as part of its calculation. This measurement is important for various calculations and system evaluations, as it provides a more accurate representation of the pressure within a system than gauge pressure, which only considers atmospheric pressure.

Understanding pressure types is crucial in HVAC applications. When evaluating system performance, various pressure readings are necessary for determining whether a system is operating within the expected parameters, and absolute pressure is foundational in these calculations. Thus, a reading of 354.7 psia signifies that the pressure being measured is above a total vacuum, making it essential data for assessing system functionality.