Question 2Refrigeration & AC - QMED

The correct answer is B. With a condenser fitted with a single fan driven by a multi-speed electric motor, the fan speed would decrease under low ambient temperature conditions. This is because as the ambient temperature decreases, the head pressure in the refrigeration system also decreases. The fan cycling control pressure switch would then signal the multi-speed motor to reduce the fan speed to maintain the appropriate head pressure in the system. The other options are incorrect because: A) The fan would cycle off under high ambient conditions, not low; C) Multiple fan systems would increase the number of fans running under high ambient conditions, not low; and D) The fan speed would decrease under low, not high, ambient conditions.