Question 84Refrigeration & AC - 1st Asst/Chief

The correct answer is A) 150-190 psig. 1. Explanation: Based on the given information and the refrigeration troubleshooting guide illustration GS-RA-52, the normal range of expected discharge pressures for an air-cooled refrigerated container unit using R-134a refrigerant, operating at a box temperature set point of -15°F with a stable return air temperature of 0°F, and an ambient air temperature of 90°F, would be 150-190 psig. 2. Reasoning: The discharge pressure in a refrigeration system is primarily determined by the condensing temperature, which is affected by the ambient air temperature. With an ambient air temperature of 90°F and the unit operating in full capacity cool mode, the expected discharge pressure range would fall within 150-190 psig, as indicated in the troubleshooting guide. 3. Other options: The other options are incorrect because they do not accurately reflect the normal discharge pressure range for the given operating conditions and refrigerant.