Question 194Refrigeration & AC - Assistant Engineer

The correct answer is B) excessive amount of non-condensable gases trapped in the condenser. If increasing the cooling water flow to a refrigeration condenser fails to lower the condenser pressure, the probable cause is likely due to an excessive amount of non-condensable gases trapped in the condenser. Non-condensable gases, such as air, can accumulate in the condenser and prevent the refrigerant from properly condensing, resulting in higher than normal condenser pressure. Increasing the cooling water flow would not be able to overcome this issue, as the non-condensable gases are the root cause. The other answer choices are incorrect because: A) a low level of Freon would not prevent the condenser from operating properly, C) an evaporator coil in need of defrosting would affect the low-pressure side of the system, and D) a partially blocked thermal expansion valve would affect the low-pressure side as well.