Question 72Refrigeration & AC - QMED

The correct answer is A) 150-190 psig. The key factors here are the refrigerant used (R-134a), the box temperature set point of -15°F, the return air temperature of 0°F, and the ambient air temperature of 90°F. With these conditions, the normal range of expected discharge pressures for an air-cooled refrigerated container unit using R-134a would be 150-190 psig. This is based on the typical discharge pressure ranges for an R-134a system operating under these temperature conditions. The other answer choices are incorrect because they either fall outside the normal operating range (B and D) or are too high (C) for the given scenario.