Question 86Refrigeration & AC - 1st Asst/Chief

The correct answer is D) excessive condenser cooling water flow. In a refrigeration system, low compressor head pressure can be caused by excessive condenser cooling water flow. When the condenser cooling water flow is too high, it can overcool the refrigerant in the condenser, leading to a lower pressure in the compressor discharge line. This reduces the overall pressure differential across the system, resulting in low compressor head pressure. The other options are incorrect because: A) excessive refrigerant in the system would cause high compressor head pressure, not low; B) insufficient condenser cooling water flow would cause high compressor head pressure; and C) air in the refrigeration system would also cause high compressor head pressure, not low.