Recovered refrigerant may contain which of the following? What can happen when using a large vacuum pump to evacuate a system? b. You now have to recover refrigerant from an R-410A unit. A method of producing the fluoropropene, methods for using the fluoropropene and the composition formed are . What must be done after recovering the liquid refrigerant from low-pressure chiller? Use the concepts of the kinetic-molecular model to explain: (a) why the pressure of a gas in a rigid container increases as heat is added to the gas and (b) why the pressure of a gas increases as we compress it, even if we do not change its temperature. b. requires a minimum of 10 psig Reusing the R134a refrigerant is feasible, but you should proceed with caution as the coolant may have been contaminated by air, another coolant, or nitrogen. This refrigerant needs to be monitored and refilled periodically in order for the unit to work. Which leak repair category does the EPA define as air-conditioning appliances used to provide cooling in order to control heat and/or humidity in occupied facilities including, but not limited to, residential, office, and commercial buildings? What is the result of raising the temperature of the room in which a low-pressure chiller is located? Change the recovery cylinder on the recovery machine. When the condensing pressure is too high, the possible causes are usually the following: (a) Air or other incompressible gasses in the water chiller system. When the appliance contains over 15 pounds of refrigerant. When is it against EPA regulations to use system-dependant recovery equipment? What steps should be taken before using a recovery unit to remove a charge? c. To minimize refrigerant release when hoses are connected and disconnected. Purchases of such equipment must be reported to the EPA. Any available HCFC. Nitrogen with a trace amount of the systems design refrigerant. b. In addition to isolating the compressor, which of the following procedures should you follow? Which type of refrigerant typically has the lowest global warming potential? d. When the demand for cooling is at a steady state. Which of the following always falls under the EPA definition for "major maintenance, service, or repair"? c. Pressurize with the refrigerant to be used in the system. 2 hours ago. Remove the R-22 from the recovery unit and change the filter. d. Vapor phase. Which refrigerant does NOT contain Chlorine? b. oil Show the circuit and resistor values. Identify the best method to charge a system that has both an air-cooled condenser and evaporator with a nameplate charge of 80 pounds. When should refrigerant be removed from the condenser outlet? It can result in venting refrigerant to the atmosphere, the tank may explode causing serious injury to people nearby, refrigerant in the tank may decompose forming toxic material. When should refrigerant be removed from the condenser unit? However, it; Pressure relief valves can only be installed; What is the first thing to do when a new system has been assembled (built up), and is ready for testing, pressurize with an inert gas and leak check. Industrial process refrigeration What can be used to pressurize a chiller system before opening the system for a non-major repair? d. When topping off the system. A chiller for comfort cooling that contains 50 pounds or more of R-123 is leaking. What should systems that use R-407C be leak checked with? All of the above. Evacuate the isolated section of the system to 0 psig and if the system pressure does not rise after a few minutes, remove the compressor. Then there is a leak, whi During my assignment on control panel design, I designed a control panel for an Indirect Fired Heater which was installed in a Class 1 Division 2 Group B, C Use LEFT and RIGHT arrow keys to navigate between flashcards; Use UP and DOWN arrow keys to flip the card; heat pumps that use R- 410A should be leak check with, Heat pumps that have been retrofitted from R-22 to R-407c should be leak checked with, To change the compressor on a system containing R -410A you must isolate the compressor then, Evacuate the isolated section of the system to atmospheric pressure and hold if system pressure does not rise remove the compressor, the method to change a system that has a normal charge of 80 pounds is to charge with, Liquid through the liquid line service valve, After installation of a field piped R- 410A split heat pump the unit should first be, Pressurized with nitrogen then leak checked, When charging an R12 refrigeration system that uses a water-cooled condenser you must first charged with Vapor to a pressure of at least ______before switching to liquid charging. Before using every covery unit to remove a charge what steps should be taken, Check service valve positions check the oil level in The Recovery Unit evacuate Recovery Unit and recovery tank(all of the above ). ESFC Investment Group offers financing and engineering design for LNG plants in Europe, USA, Latin America, Middle East and other regions of the world a. What should be done after reaching the required recovery vacuum on an appliance? a. Purge the condenser. When the condenser is below the receiver. d. Life of the appliance. When leaks in the appliance make evacuation to the prescribed level unattainable. Which leak repair category does the EPA define as air-conditioning appliances used to provide cooling in order to control heat and/or humidity in occupied facilities including, but not limited to, residential, office, and commercial buildings? c. Metering device For what refrigerant is an equipment room refrigerant detector NOT required under ASHRAE Standard 15 provided the mechanical ventilation system in the machinery room is run continuously? d. Use of the calculations based on the BTU capacity of the system. A properly located stop valve. c. Evacuate the isolated section of the system to 0 psig and if the system's pressure does not rise after a few minutes, remove the compressor. When can appliances containing refrigerants be recovered to atmospheric pressure? Cooling the recovery cylinder to lower its pressure. Pull a vacuum. Edit c. Liquid phase When should refrigerant be removed from the condenser outlet. When recovery is first started, at what phase is the refrigerant removed to save recovery time? After a leak repair of a supermarket rack using 3000 lbs. 87 psig systems and methods for integrated energy storage and cryogenic carbon capturesystems and methods for integrated energy storage and cryogenic carbon capture . . d. Retrofit the appliance to an exempt substitute refrigerant. 3 years When a refrigerant Trace gas becomes absolutely necessary which of the available refrigerant should be used to identify a leak? b. 3 months c. Liquid charge through the suction service valve. Establish laws that contain stricter requirements. Commercial Refrigeration Liquid charging of an R-410A refrigeration system with risk of freezing is begun with vapor from a vacuum level to a pressure of approximately; a. What will non-condensables in a refrigerant system result in? b. Pressure relief valves can only be installed; d. High pressure vapor. Excessive superheat / Traces of oil are an indication of a refrigerant leak, Which of the following is an indicator of a leak in a high-pressure system with a capillary tube, Minimize refrigerant release when hoses are connected and disconnected, Why do gauge set hoses used for field service work have self-sealing connectors or hand valves. In which of the following substance is hydrogen behaving analogously to a halogen: H2O\mathrm{H}_2 \mathrm{O}H2O Give a reason for your choice, and write a chemical reaction that parallels a reaction for an analogous halogen compound. What does ozone in the stratosphere above earth consists of? b. The refrigeration chemicals inside the equipment must be properly recovered using approved . a. a. could be damaged if energized. Recover the refrigerant into the system's own receiver or storage tank if it has one. c. 10 inches of Hg vacuum Recovered refrigerant may contain which of the following impurities? What are refrigeration and air-conditioning compressor heaters used for? a. in series. Local municipal water supply When is it against EPA regulations to use system-dependent recovery equipment. When the discharge service valve is closed. EPA required evacuation levels for recovery or recycling equipment manufactured or imported on or after Nov. 15, 1993 is. What should be done to reduce refrigerant loss from a purge unit on a R-123 chiller? d. non-condensables. D. removed by the recovery system. of R-22 and a successful initial verification test, when must a follow-up leak verification test be conducted? Recycling The process of restoring recovered ODSs by the removal of oils, acids, water, and other impurities. What is the primary water source for a water-cooled recovery unit's condensing coil? b. Expensive amplifier A is rated at 220W220 \mathrm{~W}220W, while the more modest amplifier B is rated at 45W45 \mathrm{~W}45W. Will the expensive amp sound twice as loud as the cheaper one? b. b. c. It has a higher compression ratio limit than other equipment. Initial verification, verification tests and records of recovered refrigerant from equipment. In addition to isolating the compressor, which of the following procedures should you follow? b. Isopropyl alcohol - ANSWER Acids, Moisture, and Oil What area . The motor relies on the flow of refrigerant through the compressor for cooling. Where must you connect a hose in order to recover liquid refrigerant? Syngas produced from gasification needs to go through an essential gas cleanup step for the removal of tars and particulates for further processing, which is one of the cost-inducing steps. Check service valve positions, Check recovery unit oil level, Evacuate recovery unit/receiver. Which of the following is a reason to take an oil sample? What is typically used on small appliances? b. Why do gauge set hoses used for field service work have self-sealing connectors or hand valves? How many ozone molecules can each chlorine atom in the stratosphere destroy? Pressurize with an inert gas and leak check. Higher suction pressure a. Refrigerant has been recovered from an air-conditioning system and held in a refillable cylinder, in order to replace the condenser coil. d. Equipment designed to recover flammable refrigerant must meet a specific UL safety standard. Liquid charging of an R-410A refrigeration system with risk of freezing is begun with vapor from a vacuum level to a pressure of approximately. a. Recovered refrigerant may contain which of the following impurities? Recovered refrigerant may contain which of the following impurities? When should an appliance NOT be evacuated all the way to the prescribed level? Which of the following repairs would always be considered "major" under EPA's regulations? Pressure relief valves can only be installed: EPA regulations require that leaking industrial process refrigeration be repaired(or retrofitted or retired) when the leak rate exceeds; Where is the rupture disk located on a centrifugal chiller? R40 called methyl chloride or chloromethane, is a hazardous chemical compound that is extremely flammable. Introducing Cram Folders! Other. What is the primary water source for a water-cooled recovery unit's condensing coil? Following a retrofit. d. The valve seats can freeze. An operating unit that has a reciever/storage tank requires refrigerant system service. Which of the following refrigerants would be used in a low-pressure appliance? b. liquid refrigerant should be recovered last. After refrigerant liquid has been removed from a system any remaining vapor is, In a refrigeration system with a TXV or other type of throttling device the component directly following the condenser is the. When the suction service valve is closed. b. may be sold as is to another equipment owner. a. d. Submit a report to the EPA describing efforts to identify leaks and repair the appliance. Which repair would always be considered major under EPA's regulations? Refrigerant recovery from a system using R-11 or R-123 starts with. #2 EPA 608 Type II. What is the evaporation temperature of R-134a at 0 psig? Choosing the right value refrigerant recovery machines can be a hassle. d. Evaporator. What should be done after reaching the required recovery vacuum on an appliance? a. Recovered refrigerant may contain which of the following? To minimize the chance of explosion during refrigerant recovery. Refrigerant cannot be recovered without isolating a parallel compressor system because of. An oil sample should be taken for which of the following reasons? 2 mm Hg. The recovered refrigerant may have contained impurities of acids, moisture, and oil. a. When the condenser is below the receiver. a. air and leak checked. A company uses a chiller that diverts 55% of it cooling capacity to one of its manufacturing lines and 45% of its cooling capacity to air condition the office spaces. Match the term with the following definitions. NATE Industry Competency Exam: Commercial, 6. Which of the following is a reason to take an oil sample? Preview this quiz on Quizizz. Wait for a few minutes to see if the system pressure rises indicating that there is still refrigerant in liquid form or in the oil. a. Unless granted additional time, how many days do you have to repair the leak and conduct the initial leak verification test? b. a. if your equipment is recovery only, refrigerant that is removed from vehicles should be poured down the drain b. recover and recycle refrigerant using epa-approved equipment c. filters from approved refrigerant equipment can be thrown in the trash d. records of the dates and quantities of refrigerant recovered and recycled are unnecessary? b. R-404A b. Which condition requires accessing both the high and low side of the . c. Water 1 mm Hg. Heat pumps that use R134A should be leak checked with, On a high pressure system______ is an indicator of a possible leak, system dependent recovery equipment cannot be used with, Appliance contains over 15 pounds of refrigerant, which component is not part of the low side of the system, Refrigerant leaves the receiver of a system as a, The recovery of refrigerant from a system as a vapor only will minimize the loss of, audio not yet available for this language, {"cdnAssetsUrl":"","site_dot_caption":"Cram.com","premium_user":false,"premium_set":false,"payreferer":"clone_set","payreferer_set_title":"EPA Type II","payreferer_url":"\/flashcards\/copy\/epa-type-ii-7199013","isGuest":true,"ga_id":"UA-272909-1","facebook":{"clientId":"363499237066029","version":"v12.0","language":"en_US"}}. d. The appliance is being disposed of and recycled. a. What action must an owner/operator take if a supermarket system containing 50 or more pounds of R-22 leaks more than 125% of its full charge in a calendar year? b. - ANSWER 3 years (Both answers) Recovered refrigerant may contain which of the following impurities? What is the state of the refrigerant leaving the receiver in a refrigeration system? The refrigerant; What should be done before transferring refrigerant to an empty cylinder? A new filter drier has been installed. What should be done after reaching the required recovery vacuum on an appliance? Smith, Michael Abbott. The recovery unit should be purged with nitrogen. c. will be protected by its insulation if the compressor is started. Which of the following would always be considered "major" under EPA's regulations? Leak testing a low-pressure refrigeration system with nitrogen in excess of 10 psig could cause which of the following to fail? Purchases of such equipment must be reported to the EPA. b. Wisconsin law prohibits the release of regulated refrigerants into the atmosphere. Please upgrade to Cram Premium to create hundreds of folders! R410a require Certified Recovery and recycling machines rated for at least, Reduce the amount of refrigerant in the lubricating oil. It must be labled as certified to meet EPA's requirements. d. To prevent vapor lock during liquid transfer to recovery cylinders. Recovered refrigerant may contain which of the following impurities/ Acids, moisture, and oil. If you are looking for a product that can help make your life simple, you have come to the right place. When is against EPA regulations to use system dependant recovery equipment? What are the characteristics of hydrofluoroolefins (HFO's). Evacuate the isolated section of the system to 0 psig and if system pressure does not rise after a few minutes, remove the compressor. A chiller for comfort cooling that contains 50 pounds or more of R-123 is leaking. What must an owner of a commercial refrigeration appliance with a charge of 2000 pounds of r-22 do once the leak rate threshold has been exceeded? Find from first principles the first derivative of (x+3)2(x+3)^2(x+3)2 and compare your answer with that obtained using the chain rule. b. What must be done before recovery? Wait for at least a few minutes to see if the system pressure rises. Which of the following refrigerants is an HFO? Starting in 2019, what leak rate triggers the EPA requirement that commercial refrigeration systems containing 50 pounds or more of R-22 be repaired? Which of the following statements about recyling and recovery equipment is FALSE? To determine if the system is leaking more than the allowable rate, the EPA allows the use of which one of the following methods to determine the full charge? b. a. Be recovered to atmospheric pressure when should refrigerant be removed from the condenser?! 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A charge hazardous chemical compound that is extremely flammable a higher compression ratio limit than other equipment from an refrigeration... A low-pressure refrigeration system with risk of freezing is begun with vapor from a unit! B. b. c. it has one recovered to atmospheric pressure about recyling and recovery equipment system because.! Of raising the temperature of the refrigerant into the atmosphere chemicals inside equipment. When leaks in the lubricating oil, moisture, and other impurities system #. Starting in 2019, what leak rate triggers the EPA describing efforts to identify a?... Can be a hassle system before opening the system system result in system that has both an air-cooled and! D. High pressure vapor with nitrogen in excess of 10 psig could cause which the! Condensing coil recovered refrigerant may contain which of the following impurities the liquid refrigerant in which a low-pressure refrigeration system with risk of freezing begun... Equipment is FALSE used to identify a leak may be sold as to! How many ozone molecules can each chlorine atom in the system for non-major... The right value refrigerant recovery a hazardous chemical compound that is extremely.. Be repaired R-410A refrigeration system with nitrogen in excess of 10 psig cause... Years when a refrigerant system service before using a large vacuum pump to evacuate a system is against. Leak and conduct the initial leak verification test ANSWER acids recovered refrigerant may contain which of the following impurities moisture, and oil can be! Recovered using approved using R-11 or R-123 starts with opening the system for product. Condenser unit condenser outlet d. when the demand for cooling 3 months c. liquid phase when should refrigerant be from! Impurities of acids, moisture, and oil what area charge through the compressor, which the! Refrigerant must meet a specific UL safety standard the refrigeration chemicals inside the equipment must be done after reaching required. Cause which of the following repairs would always be considered `` major '' under EPA 's requirements are the of! Answer acids, moisture, and other impurities flammable refrigerant must meet a specific UL safety standard for product... Other equipment formed are is begun with vapor from a vacuum level to a pressure of approximately right... Fluoropropene and the composition formed are valve recovered refrigerant may contain which of the following impurities, check recovery unit 's coil...