Question 24Refrigeration & AC - 1st Asst/Chief

You are correct that the answer is B) excessive condenser cooling water flow. Low compressor head pressure in a refrigeration system is typically caused by excessive condenser cooling water flow. When the condenser cooling water flow is excessive, it can overcool the condenser, reducing the condensing temperature and pressure. This results in the compressor having to work harder to maintain the necessary pressure differential, leading to low compressor head pressure. The other options are incorrect because air in the system (A) would cause high compressor head pressure, excessive refrigerant (C) would cause high head pressure, and insufficient condenser cooling water flow (D) would cause high head pressure.