What issue can non-condensables cause in a refrigeration system?

Non-condensables, such as air or other gases that do not condense under the operating conditions of a refrigeration system, can indeed lead to high discharge pressure. When non-condensable gases are present in the system, they take up space in the condenser that would otherwise be occupied by refrigerant vapor. As the refrigerant vapor passes through the compressor, the presence of these gases increases the amount of pressure required to compress the refrigerant effectively.

This elevated pressure can result in several issues. It can lead to decreased efficiency because the compressor has to work harder to achieve the same cooling effect, resulting in higher energy consumption. Additionally, high discharge pressures may push operating conditions beyond safe or optimal limits, potentially leading to mechanical failures in the compressor or other components of the system.

While inadequate cooling, low discharge pressure, and unit damage can also be concerns in refrigeration systems, the primary issue linked directly to the presence of non-condensables is the increase in discharge pressure, which can affect system performance and longevity.