EPA 608 Questions And Answers 100% Verified

EPA 608 Questions And Answers 100% Verified What are the typical uses of the center port of gauge set? - ANSWER Used during evacuation charging and recovery procedures. What color are the gauges on a manifold gauge set? - ANSWER Low pressure is blue High pressure is red. What are the typical ranges of pressure measurements used on the gauges of a manifold gauge set? - ANSWER High side is 0 to 500 PSIG; Low side is 0 to 350 PSIG and 0 to 30 in. Hg below atmospheric pressure. Is the refrigerant leaving a condenser at a high or low pressure? Is it a liquid or a gas? - ANSWER High pressure liquid. Is the refrigerant entering the expansion valve (variable metering device) a liquid or gas? - ANSWER Liquid high pressure. Is the pressure of the refrigerant entering the compressor high or low? - ANSWER Low pressure vapor. Where in a refrigerant circuit does a liquid boil to absorb heat? - ANSWER In the evaporator. The refrigerant in the suction line is a gas that has been heated above its saturation. What is this condition called? - ANSWER Superheated vapor. What can cause liquid refrigerant to migrate to a compressor crankcase? - ANSWER If the compressor is located in the coldest location in the circuit. List two conditions that can quickly damage a compressor that is starting to run? - ANSWER Operating while in a deep vacuum or when the service valves are closed. What system failures require taking an oil sample? - ANSWER A compressor burnout or if the unit has had a leak. Is flushing with refrigerant an acceptable tube cleaning method? - ANSWER No. In addition to preventing and repairing leaks - ANSWER what else should a technician do to conserve refrigerant? Recover and recycle used refrigerants. What factors affect the speed of an evacuation? - ANSWER Pump size hose length hose diameter size of system to be evacuated ambient temperature suction line size and the amount of moisture in the system. How should gauge set hoses be sized for use in evacuating a system? - ANSWER Use the shortest length and the largest diameter possible for the quickest evacuation. At least as large as the vacuum pump inlet. When evacuating - ANSWER what is the benefit of using short hoses with large diameters? Reduces emissions pressure drop and evacuation time. which connection determines the preferred size of hoses used with a vacuum pump? - ANSWER The vacuum pump inlet. As the capacity and suction hose size increase - ANSWER what happens to the time needed for an evacuation? Time is reduced. What purpose is served by heating a system during dehydration? - ANSWER To speed up moisture removal. Does a thorough evacuation remove moisture from a system? - ANSWER Yes. What can happen to oil in the compressor if the moisture is left in an operating system? - ANSWER The oil will form hydrofluoric and hydrochloric acids which will corrode the internal parts of the system. What is the result of over-evacuating a system? - ANSWER No damage will be done. How can a system be leak checked using a low pressure gauge? - ANSWER Vacuum reading will rise when vacuum pump is turned off. How close should the vacuum