If increasing the cooling water flow to a refrigeration condenser fails to lower the condenser pressure, the probable cause may be due to what condition?

Correct Answer: Option B — excessive amount of non-condensable gases trapped in the condenser

Non-condensable gases like air accumulate in the condenser upper shell, creating a partial pressure barrier that insulates the heat transfer surface. Regardless of increased cooling water flow, these trapped gases prevent effective latent heat rejection, resulting in persistently elevated high-side discharge pressures.