Question 22Refrigeration & AC - 1st Asst/Chief

The correct answer is B) The system is low on refrigerant. In a TXV controlled refrigeration system, a low refrigerant charge will cause excessively low pressure at the compressor suction. This is because the TXV regulates the flow of refrigerant into the evaporator based on the superheat at the evaporator outlet. With a low refrigerant charge, there is insufficient refrigerant in the system to maintain the proper pressure and temperature relationships, leading to low suction pressure at the compressor. The other options are incorrect because: A) The high pressure cutout would not affect the low suction pressure. C) The box solenoid valve being stuck open would not cause low suction pressure. D) Insufficient condenser cooling water would cause high, not low, suction pressure.