What is the best use for testing with soap bubbles? EPA regulations require that all appliances containing more than 50 pounds of refrigerant ,except for commercial and industrial process refrigeration, be repaired when the . Ice making refrigeration Which refrigerant(s) must be recovered before opening or disposing of appliances? Every refrigerating system must be protected by which of the following; Which of the following safety precautions should be adhered to for low-pressure systems? When the appliance contains over 15 pounds of refrigerant. c. Commercial refrigeration Recycle phase b. Which repair would always be considered major under EPA's regulations? A heat exchanger is a system used to transfer heat between a source and a working fluid. 10% Which of the following statements about recycling and recovery equipment is FALSE? In addition to isolating the compressor, which of the following procedures should you follow? What is the best use for testing with soap bubbles? During the installation of a new appliance. Which of the following refrigerants would be used in a low-pressure appliance? can probably be charged back into the system. Evacuate the isolated section of the system to 0 psig and if system pressure does not rise after a few minutes, remove the compressor. d. 90 psig. Recovered refrigerant may contain which of the following impurities? The refrigerant should be chilled. Which of the following is an HFC refrigerant. Industrial process refrigeration Which of the following repairs would always be considered "major" under EPA's regulations? a. Receiver Where would you place a leak detector probe to check gas leaks into the water box with water removed? 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? c. Comfort cooling How can you speed up the removal of the refrigerant charge from a system? Smith, Michael Abbott. What must be done before recovery? a. the compressor should be valved off. Leaks in the appliance make a recovery to the prescribed level unattainable. Chilled water from the evaporator answer choices Ammonia, carbon dioxide, and methyl chloride Sodium chloride, potassium nitrate, and silicone oil Sulphur dioxide and methane Acids, moisture, and oil Question 8 30 seconds Q. Refrigerant cannot be recovered without isolating a parallel compressor system because of; 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"}}. Patent Application Number is a unique ID to identify the METHOD FOR PURIFYING 1,2-DIFLUOROETHYLENE (HFO-1132) mark in USPTO. Pressure relief valves can only be installed; Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. Which of the following is a reason to take an oil sample? b. must be kept warm to operate properly. In addtion to isolating the compressor, which of the following procedures should you follow? A comfort-cooling appliance containing 50 pounds or more of R-22 is found to be leaking beyond the applicable leak rate threshold. a. 3 years Which of the following would always be considered "major" under EPA's regulations? Composed of stratified squamous epithelium? Service valve positions and recovery oil level should be checked, when applicable. Small appliance recovery and recycling equipment may be tested under these requirements or the ones detailed in Appendix C to 40 CFR 82, Subpart F. Recovery equipment standards vary depending on the size and type of air-conditioning or refrigeration appliance being serviced: EPA has approved the Air-Conditioning, Heating, and Refrigeration Institute (AHRI) and Underwriters Laboratories (UL)to certify recycling and recovery equipment. Liquid charged into a deep vacuum will evaporate and may lower the temperature, freezing water in the heat exchanger tube bundle. You now have to recover refrigerant from an R-410A unit. Pull a vacuum. Which of the following refrigerants would be used in a low-pressure appliance? A company uses a chiller that divers 55% of its cooling capacity to one of its manufacturing lines and 45% of its cooling capacity to air condition the office spaces. b. What are refrigeration and compressor heaters used for? 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 area of a refrigeration system does oil foaming usually occur? }}WHATIF? 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. Sodium chloride, potassium nitrate, and silicone oil c. Sulphur dioxide and methane d. Acids, moisture, and oil D What is the first thing to do when a new system has been assembled and is ready for testing? a. d. Nitrogen, What would be the approximate refrigerant pressure of an R-410A machine at (80F) room temperature while the machine is idle? Which of the following additions of refrigerant, when added to an appliance containing 50 or more pounds of an ozone-depleting refrigerant, triggers the requirement to calculate the leak rate? Both organizations can provide information on certified equipment. Which of the following statements about recyling and recovery equipment is FALSE? The market is filled with different types of products that vary in features and specifications. a. EPA 608 study material including (Core, type, Introduction to Chemical Engineering Thermodynamics, Hendrick Van Ness, J.M. What is the primary water source for a water cooled recovery unit condensing coil? a. You now have to recover refrigerant from an R410A unit. We'll bring you back here when you are done. A routine maintenance tasks which must be performed on refrigerant recycling machines is to, refrigerant should be removed from the condenser Outlet if the, when evacuating a system the use of a large vacuum pump could, On refrigeration units that use an open compressor the_____ is most likely to leak if the unit is not used for several months, The primary water source for cooling the condenser of a water cooled Recovery Unit is, when using recovery and recycling equipment manufactured BEFORE November 15th 1993 technicians must evacuate a unit that has a normal charge of 10 pounds of CFC 500 to ______ before disposing of the system, the evaporation temperature of R 410A at 100 PSIG is about, R 410 A requires recovery tanks rated for at least, During the evacuation of a system that contains large amounts of moisture it may be necessary to increase pressure in the system with_____ to counteract the freezing of the moisture, Prior to replacing the condenser coil in a high pressure system the refrigerant was recovered and stored in a refillable cylinder the refrigerant, can probably be charged back into the system, The evaporation temperature of R134a at 0 PSIG is, The EPA regulations require that any appliances containing more than 50 pounds of refrigerant except for commercial and Industrial process Refrigeration must be repaired when the leak rate exceeds_____ of the charge per year, The EPA regulations require that leaking commercial or industrial process Refrigeration equipment must be repaired when the leak rate exceeds_____ of the charge per year, You are going to service an older residential split system air conditioner you would expect to find the system charged with which refrigerant. b. Wait for at least a few minutes to see if the system pressure rises. An operating unit that has a reciever/storage tank requires refrigerant system service. When is against EPA regulations to use system dependant recovery equipment? There FUNCTIONAL STEPS OF HOW OIL-FREE AIR COMPRESSOR WORK? Which layer in the skin is the thicker layer composed primarily of connective tissue? In addition to isolating the compressor, which of the following procedures should you follow? d. Microns. Other. Which of the following is NOT required to mothball an appliance (thereby extending the leak repair deadline)? The motor relies on the flow of refrigerant through the compressor for cooling. Liquid charge through the liquid-line service valve. c. The unit is not cooling properly. Every month c. Liquid charge through the suction service valve. NATE Industry Competency Exam: Commercial, 6. c. Water in the system can freeze. b. b. Psia d. -1F, 8. Please sign in to share these flashcards. Following a retrofit. When the condenser is below the receiver. Which of the following is an indicator of a leak in a high-pressure system with a capilliary tube? There are two acceptable procedures for recovering refrigerant contained in oil: Evacuate (or pressurize) the refrigeration appliance, or isolated portion, to a pressure no greater than 5 psig and then remove the oil; or Drain the oil into a system receiver to be evacuated (or pressurized) to a pressure no greater than 5 psig. Which of the following CANNOT be used as a reason to extend the appliance repair deadlines? d. Expansion device, What level of vacuum should be pulled when evacuating a vapor compression system to ensure all moisture has been removed? b. in parallel. Please click here to see any active alerts. Which of the following is a reason to take an oil sample? When is it against EPA regulations to use system-dependent recovery equipment? It is also possible that an employer would dispose of the outer packaging. What is the first thing to do when a new system has been assembled and is ready for testing? An initial leak verification test failed after repairing a leak in a rack refrigeration system for a supermarket using an HCFC refrigerant. Recovering refrigerant from a system in the vapor phase will minimize the loss of which of the following? To reduce the amount of refrigerant in the oil. Recovered refrigerant may contain which of the following impurities? Microns What is the primary water source for a water cooled recovery unit condensing coil? d. When the demand for cooling is at a steady state. d. horizontally. Replacement of an evaporator coil. What should be done before transferring refrigerant to an empty cylinder? When can appliances containing refrigerants be recovered to atmospheric pressure? When should refrigerant be removed from the condenser outlet. Acids, Moisture, and Oil What area of a refrigeration system does oil foaming usually occur? c. To minimize refrigerant release when hoses are connected and disconnected. c. is toxic when released into the atmosphere EPA no longer requires that persons servicing stationary air-conditioning and refrigeration equipment certify that they have acquired refrigerant recovery or recycling equipment and that they are complying with the applicable requirements. Wisconsin law prohibits the release of regulated refrigerants into the atmosphere. After a leak repair of a supermarket rack using 3000 lbs. Recovered refrigerant may contain which of the following impurities? a. b. the electrical connections. Purchases of such equipment must be reported to the EPA. 2 mm Hg. Use gloves and safety goggles when working with liquid refrigerant. Which of the following CANNOT be used as a reason to extend the appliance repair deadlines? c. Replacement of a Schrader valve core. Please upgrade to Cram Premium to create hundreds of folders! When the discharge service valve is closed. a. ASRAE Standard 15-2013 requires that the use of room sensors and alarms to detect: When leak testing a low-pressure chiller, the maximum pressure to use is; What type of equipment can be worked on with Type III certification? Leaks in the appliance make recovery to the prescribed level unattainable. b. 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. What should be done after reaching the required recovery vacuum on an appliance? b. When under a deep vacuum the motor windings of a hermetic refrigeration compressor; Introducing Cram Folders! The release of regulated refrigerants generally occurs as refrigeration and air-conditioning equipment is salvaged or dismantled for disposal. b. b. The outer packages are designed to remain in place from shipment to disposal, so it is possible and intended that the refrigerant supplied in DOT-39 cylinders spend the entire life-cycle inside the fiberboard outer packaging. For what refrigerant is an equipment room refrigerant detector NOT required under ASHRAE Standard 15 provided the mechanical ventilation system in the machinery is run continuously? The motor relies on the flow of refrigerant through the compressor for cooling. a. How long must owners and operators of regulated appliances normally containing 50 or more pounds of HCFC refrigerant keep records of leak inspections, initial leak verification, and follow-up verification tests? Industrial process refrigeration What is the state of the refrigerant entering the compressor of a refrigeration system? Microns what is the thicker layer composed primarily of connective tissue d. Expansion,... Outer packaging the best use for testing with soap bubbles to ensure moisture. 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