Question 80Refrigeration/AC - QMED70% to pass
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?
AI Explanation
The correct answer is C) 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, reduce the condenser's heat transfer efficiency, preventing the refrigerant from condensing properly and resulting in higher condenser pressure.
The other options are incorrect because a low level of Freon (A) would generally result in low system pressure, a partially blocked thermal expansion valve (B) would affect the evaporator rather than the condenser, and an evaporator coil in need of defrosting (D) would not directly impact the condenser pressure.
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