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The presence of non-condensables in a refrigeration system primarily leads to high-pressure issues. Non-condensable gases, such as air or other substances that do not condense within the system under its operating conditions, can accumulate in the condenser. This accumulation interferes with the normal condensing process by taking up space that should be occupied by the refrigerant.

As a result, the pressure within the condenser increases because the refrigerant cannot effectively condense. This elevated pressure can lead to various problems, such as reduced efficiency of the system, increased energy consumption, and potential damage to components due to the excessive pressure. Additionally, it may cause the system to operate at temperatures that exceed design limits, potentially resulting in more severe failures or safety risks.

Understanding this impact underscores the importance of maintaining proper system conditions and ensuring that non-condensable gases are minimized or removed from the system through proper maintenance practices.