Question 49Refrigeration/AC - Assistant Engineer70% 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 C) 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 correct because in an air-cooled refrigeration system, the fan cycling control pressure switch is designed to regulate the fan speed based on the condenser pressure. When ambient temperatures are low, the condenser pressure will also be low, causing the pressure switch to decrease the fan speed to maintain the proper pressure in the refrigeration system. This helps to prevent overcooling and ensures efficient operation of the system.
The other options are incorrect because they do not accurately describe the function of the fan cycling control pressure switch in an air-cooled refrigeration system with a single fan driven by a multi-speed motor.
Related Questions
#47 Minor repairs may be performed on low-pressure refrigerant systems without recovering the refrigerant charge if the pressure in the system is raised to atmospheric. How may this be accomplished? #48 The most cost-effective method of recovering refrigerant from a low-pressure chiller with more than 500 lbs. of refrigerant and to meet EPA requirements is to recover the refrigerant using what protocol? #50 In a refrigeration system, the valve shown in the illustration is used for what purpose? Illustration GS-RA-14 #51 An arrow stamped on the valve body of a water regulating valve indicates which of the following? #52 The set point adjustment of the device shown in the illustration is made by rotating what component? Illustration GS-RA-14