Question 2Refrigeration/AC - QMED70% to pass
As shown in the illustrated refrigeration system piping schematic diagram with the various accessories and controls and equipped with an air-cooled condenser with high side pressure controls, what statement is true concerning the fan cycling control pressure switch? Illustration GS-RA-39
AI Explanation
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.
Related Questions
#1 The set point adjustment of the device shown in the illustration is made by rotating what component? Illustration GS-RA-14 #3 If it is necessary to increase the operating head pressure of the refrigeration system using the device shown in the illustration, what should be done? Illustration GS-RA-14 #4 In a refrigeration system that is not protected by a water failure switch, if the cooling water to the condenser fails, what will be the result for protective purposes? #5 Excessive moisture being collected in the purge unit of a low-pressure refrigeration system could indicate which probable condition?