What does an increase in pressure due to non-condensables indicate?

An increase in pressure due to non-condensables is indicative of potential problems within the HVAC system, particularly affecting cooling performance. Non-condensables, such as air or other gases that do not condense under the system's operating conditions, can accumulate in the refrigerant circuit. Their presence can lead to higher pressure readings because they occupy space in the system that should be filled by the refrigerant, which is responsible for absorbing and transferring heat.

As a result, the system has to work harder to achieve the desired cooling effect, leading to decreased efficiency and reduced cooling capacity. If non-condensables are present in significant amounts, they can lead to an increase in head pressure, which can cause the compressor to overheat, potentially resulting in failure or decreased reliability of the system over time. Addressing this issue is essential for maintaining optimal operation and ensuring that the system performs efficiently and effectively.