What is the effect of low discharge pressures on compressor performance?

Low discharge pressures can significantly affect compressor performance, and one of the key consequences is the potential for compressor damage. When the discharge pressure is too low, it often indicates that the refrigerant is not being compressed adequately. This can lead to a range of issues, including higher motor loads relative to the reduced refrigerant flow, overheating, and ultimately mechanical failure or burnout of the compressor.

In addition to potential damage to the compressor, low discharge pressures can create imbalances in the refrigerant cycle. While other factors may also contribute to poor performance—such as the temperature of the refrigerant returning to the compressor—damage is often the most severe and immediate risk. The compressor may be forced to work harder than necessary, leading to overheating and wear on internal components.

The focus on the potential for compressor damage highlights the importance of maintaining proper discharge pressure levels to ensure efficient operation and longevity of the HVAC system.