Question 193Refrigeration/AC - Assistant Engineer70% to pass
In an operating, water-cooled, multi-box refrigeration system, both low discharge and high suction pressures are being simultaneously experienced. The probable cause for this condition is which of the following?
AI Explanation
The correct answer is D) discharge relief valve leaking back to the suction side.
In a properly functioning refrigeration system, the discharge pressure should be higher than the suction pressure. If the discharge relief valve is leaking back to the suction side, it would allow high-pressure refrigerant from the discharge side to flow back to the suction side, resulting in both low discharge pressure and high suction pressure simultaneously.
The other options are incorrect because: A) improper superheat adjustment would not cause both low discharge and high suction pressures; B) a fouled condenser would result in high discharge pressure and low suction pressure; and C) an overcharge of refrigerant would typically result in high discharge and suction pressures.
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