Question 90Refrigeration & AC - QMED

The correct answer is A) cooling mode. The key is that the actual box temperature of -18.0°C is higher than the microprocessor-controlled temperature setting of -28.9°C. This indicates that the cooling mode should be active in order to lower the box temperature down to the desired -28.9°C setting. The cooling mode will engage the refrigeration system to actively remove heat from the container and maintain the frozen cargo temperature. The other options are incorrect because: B) heating mode would be used to increase the temperature, which is not needed in this case; C) modulating cooling mode would be used to maintain a narrower temperature range, not the current wide gap; and D) air circulation mode alone would not actively cool the container to the set temperature.