HVAC 125 Unit 18-Special refrigeration components ACTUAL UPDATED QUESTIONS AND CORRECT ANSWERS

HVAC 125 Unit 18-Special refrigeration components ACTUAL UPDATED QUESTIONS AND CORRECT ANSWERS What is an evaporator pressure regulator? - CORRECT ANSWERSA flow control device that prevents refrigerant pressure from operating below the minimum value in the evaporator. What systems use crankcase pressure regulators? - CORRECT ANSWERSLow temp refrigeration systems like freezers How does a CPR work? - CORRECT ANSWERSNormally is a close on rise regulator. The outlet pressure of the valve is the closing force within it. The opposing opening force within the valve is an interior spring. These two forces oppose each other to regulate the port size within the valve. What is the purpose of a solenoid valve? - CORRECT ANSWERSStops or allows flow of refrigerant. How can a technician tell which direction a solenoid valve should be installed? - CORRECT ANSWERSThere will be an arrow stamped on the valve to which direction it flows. Explain the difference methods used to maintain a minimum high-side pressure on outdoor air-cooled condensers. - CORRECT ANSWERSmaintain the minimum liquid pressure using condenser flooding controls. Works by controlling the flow of refrigerant through the condenser using OROA pressure regulating valves. What are the two basic types of relief valves used on refrigeration systems? - CORRECT ANSWERSAutomatic and one time release valves. What is the function of a suction-line accumulator in a refrigeration system? - CORRECT ANSWERSPrevents liquid refrigerant going to the compressor. What is the function of an oil separator in a refrigeration system? - CORRECT ANSWERSSeparates and collects oil in discharge line after compressor and is returned to the compressor's crankcase. What is the function of a receiver in a refrigeration system.? - CORRECT ANSWERSA vessel that stores access refrigerant that's not being used. Why are suction-to-liquid line heat exchangers used on refrigeration systems? - CORRECT ANSWERSImproves system efficiency and helps prevent liquid going to the compressor. What device can be installed on a system to indicate the moisture content of the refrigera