ESCO Light Commercial Refrigeration EXAM 100% CORRECT VERIFIED ANSWERS 2024/2025 GRADED, Exams of Electronic Technology

Download ESCO Light Commercial Refrigeration EXAM 100% CORRECT VERIFIED ANSWERS 2024/2025 GRADED and more Exams Electronic Technology in PDF only on Docsity! ESCO Light Commercial Refrigeration EXAM 100% CORRECT VERIFIED ANSWERS 2024/2025 GRADED In a dry type (direct expansion) evaporator, liquid refrigerant must boil away as close to the end of the coil as possible in order to: The difference between the temperature of the refrigerant boiling in the evaporator and the temperature at theevaporator outlet is known as: An expansion device that is stuck open will cause: When measuring evaporator superheat on a commercial system that has a long suction line, the pressure reading should be taken at the: Superheat measurements are best taken: Atechnician is checking the superheat on a multi-circuit evaporator and finds one of the circuits has a superheat that is higher than the others. This could be caused by: A TEV with an external equalizer is used on: Dry type evaporators operate most efficiently with a superheat setting of approximately: An evaporator used to chill liquids si operating with a normal superheat setting, but the system is not cooling the product properly. Which of the following is the most likely cause? What time interval is required between each superheat adjustment? Alow temperature evaporator used for cooling space or product refrigeration: The suction accumulator prevents flood back from which of the following: When a compressor service valve si back seated, which port is closed? When work on a refrigeration system is complete, the compressor service valves should be in this position: What type of oil is used with HFC refrigerant? On an expansion valve refrigeration system, a low pressure control can indirectly be used for: What valve is used to connect multiple evaporators of different temperatures to a single compressor? What valve is used to prevent evaporator pressure from fallingbelow a-set limit? What valve is used to control excessive pressure entering the compressor during a hot pull down? The oil return orifice inside a suction line accumulator is designed to: Why do suction line filter driers have two service ports? Athermostatic expansion valve (TV) that creates an unstable suction pressure si said to be: Head pressure control valves permit hot gas to travel directly to: Liquid slugging of the compressor can becaused by: A-severe evaporator freeze-up may cause: The oil separator is installed in the: If an oil separator is not used: If a system has a long suction line riser an oil trap should be installed; The relationship between low-side absolute pressure and high-side absolute pressure is called: Capacity control of a large compressor can be performed with: Vibration eliminators should be installed to the compressor crankshaft centerline. What (Ph) level is considered neutral and desired for ice machine or cooling towers applications; On a rack of multiple compressors, each compressor is controlled by: Which refrigerant line is most sensitive to improper sizing What is the most likely cause fo the following symptoms? The compressor shuts of on the oil pressure switch. Teh oil sight glass si 1/2 ful. Suction pressure si 3pig (R-502). Oil pressure is 70 psig. A Michigan serviceman is called to a supermarket on a cold winter day because all the frozen food is melting. Alow temperature rack of five compressors control the frozen food and ice cream units. Power supply is OK, but al compressors are of. Al five low pressure controls are open. The liguid receiver shows full. The hot gas discharge line is cold because the condenser is on the roof. What si the likely cause of the trouble? A string of five frozen food cases are operated by one compressor. All five cases are iced up. What is the likely problem? At what evaporator temperature does an ice maker begin to make ice? What device is used ot check for parallel misalignment of a motor coupling? Defrosting a low temperature evaporator can be accomplished by: A system that uses an Automatic Expansion Vvael (AEV) is not cooling enough and running continuously. The gauges reveal low head pressure, but the suction pressure is acceptable. This could be caused by