b. Isopropyl alcohol A basketball of circumference 75.5cm75.5 \mathrm{~cm}75.5cm and mass 598g598 \mathrm{~g}598g is forced to the bottom of a swimming pool and then released. Leak testing a low-pressure refrigeration system with nitrogen in excess of 10 psig could cause which of the following to fail? Which process applies to cleaning refrigerant for immediate reuse by oil separation and single or multiple passes through devices, like replaceable ore filters driers, which reduce moisture and acidity? When can appliances containing refrigerants be recovered to atmospheric pressure? c. R-410A and leak checked. Every refrigerating system mst be protected by which of the following? Nitrogen with a trace amount of the system's design refrigerant. Where must you connect a hose in order to recover liquid refrigerant? a. Receiver Wisconsin law prohibits the release of regulated refrigerants into the atmosphere. Recovered refrigerant may contain which of the following impurities? Pressure relief valves can only be installed; Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. The faster way to recover refrigerant from a system is to remove it in the _____ phase? Why could recycling or recovery machines that use hermetic compressors overheat during deep evacuations? Regenerate (reclaim). To prevent refrigerant vaporization. b. REFRIGERANT RECOVERY PROGRAM. The gauge hoses used to connect the recovery unit to . How can you speed up the removal of the refrigerant charge from a system? It is best practice to use dry nitrogen to break the vacuum when dehydrating by the triple evacuation method. Propane purchased for grilling contains impurities which will damage refrigeration equipment. Recovering refrigerant from a system in the vapor phase will minimize the loss of which of the following? A purge unit that discharge a low percentage or refrigerant with the air they remove. a. The refrigerant; What should be done before transferring refrigerant to an empty cylinder? d. De-ionized water. a. Determine the values of the following integer expressions: What part of a belt-driven non-hermetic compressor is most likely to leak if the compressor has not been used for several months? b. Recover the refrigerant and leak check the appliance with a trace gas. c. Water in the system can freeze. Which of the following repairs would always be considered "major" under EPA's regulations? Liquid charged into a deep vacuum will evaporate and may lower the temperature, freezing water in the heat exchanger tube bundle. Heat pumps drive heat from one or more heat sources (Q in) at low temperatures (T source) to one or more heat sinks (Q out) at high temperatures (T sink) with the assistance of an external energy source (electricity; W in).Heat pumps use low-boiling point refrigerants as transitional fluids to absorb heat and vaporize in an evaporator. Before transferring refrigerant to an empty cylinder? 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. What should be done to reduce refrigerant loss from a purge unit on a R-123 chiller? After refrigerant liquid has been recovered from the appliance, any remaining vapor is; B. isolated in the appliance. What should systems that use R-407C be leak checked with? a. R-22 Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer, cleaning and corrosion control asa jeppsen st. c. Liquid phase We weren't able to detect the audio language on your flashcards. Recovered refrigerant may contain which of the following impurities? b. Please click here to see any active alerts. Keep the following in mind: Recovered refrigerant may contain which of the following impurities? WHATIF?\text{\blue{WHAT IF? D. removed by the recovery system. Whole Home Evaporative Cooling This refrigerant needs to be monitored and refilled periodically in order for the unit to work. d. Replacement of a condenser fan motor. What should be done before transferring refrigerant to an empty cylinder? b. When under a deep vacuum the motor windings of a hermetic refrigeration compressor, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer, Advanced Engineering Mathematics, International Student Version, BIO-55 UNIT 4 Ch. Unless granted additional time, what must be completed in 30 days? In these cases, the equipment is recovered and repaired and the same recovered refrigerant is recharged. c. Using a two-stage vacuum pump Find out how you can intelligently organize your Flashcards. To minimize refrigerant release when hoses are connected and disconnected. Small appliance recovery equipment must be able to recover either: 90 percent of the refrigerant in the small appliance when the small appliance compressor is functional, or. a. Ammonia, carbon dioxide, and methyl chloride b. A properly located stop valve. After initially accelerating upward, it rises at a constant velocity. The usual refrigeration process comprises the compressors input of work and exploits the vapor density cycle. Recovered refrigerant may contain which of the following impurities? c. Leaks in the appliance make recovery to the prescribed level unattainable. d. To prevent acid pitting. To pinpoint refrigerant leaks. May 2016. c. Accumulator Heat exchangers are used in both cooling and heating processes. Which of the following is an indicator of a leak in a high-pressure system with a capilliary tube? c. Commercial refrigeration What are the characteristics of hydrofluoroolefins (HFO's). Release A discharge of a hazardous material or other contaminant into the environment. To avoid freezing the water contained in a water-cooled heat exchanger of an R-134a refrigeration system during charging, the system should be initially charged with R-135a vapor to a pressure of approximately; What will non-condensables in a refrigeration system result in? For most recovery and recycling equipment, these requirements are detailed in Appendix B2 to 40 CFR 82, Subpart F. Requirements for equipment manufactured or imported after January 1, 2017, are detailed in Appendix B3 (for non-flammable refrigerants) or Appendix B4 (for flammable refrigerants). Compressor and gauge port In addition to isolating the compressor, which of the following procedures should you follow? d. Evacuate the isolated section of the system to 5 inches of vacuum and when the system's pressure rises out of the vacuum, remove the compressor. Propane and Isobutane are examples of "A3" flammable refrigerants that do not require recovery. [2] They are widely used in space heating, refrigeration, air conditioning, power stations, chemical plants, petrochemical plants, petroleum . Pull a vacuum. Recovered refrigerant may contain which of the following impurities? d. 500 microns. Save multiple values in cookie c#. b. Service valve positions and recovery oil level should be checked, when applicable. b. liquid refrigerant should be recovered last. [1] The fluids may be separated by a solid wall to prevent mixing or they may be in direct contact. Which of the following safety precautions should be adhered to for low-pressure systems? Material recovered from the exploded units had been analysed and evidence pointed to a counterfeit refrigerant being to blame for the explosions. After refrigerant liquid has been recovered from the appliance, any remaining vapor is; d. Evaporator. Acids moisture & oils (all of the above ), The back seating of a suction shutoff valve will close the. b. R-404A a. b. b. a. b. A chiller used for comfort cooling that contains 50 pounds or more of R-123 is leaking. d. The valve seats can freeze. If you are looking for a product that can help make your life simple, you have come to the right place. c. Local municipal water supply These systems operate below atmospheric pressure. Compressor 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. What is the primary water source for a water cooled recovery unit's condensing coil? d. Every 12 months, How long do owners or operators of an appliance with a full charge of 50 or more pounds of ozone-depleting refrigerant have to retire an appliance if the replacement uses a refrigerant that is exempt from the venting prohibition? a. When should an appliance NOT be evacuated all the way to the prescribed level? Purchases of such equipment must be reported to the EPA. Before making a major repair, technicians must evacuate an appliance or component containing more than 200 pounds of R-410A to which of the following levels? b. 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? a. the service valve connection. What is the primary water source for a water cooled recovery unit's condensing coil? a. b. b. What refrigerant is a cylinder that has a gray body and yellow top designed to hold? a. When a trace gas becomes absolutely necessary, which of the available refrigerants should be used to help locate a leak? a. When should refrigerant be removed from the condenser outlet? d. When topping off the system. b. must be kept warm to operate properly. 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. Why could a recycling or recovery machine that uses a hermetic compressor overheat when drawing deep vacuums? c. must be reclaimed. What should be done after reaching the required recovery vacuum on an appliance? d. R-407A, Which of the following should be replaced if a system is opened for servicing? cooling the recovery cylinder to lower its pressure, Refrigerant has been recovered from an air conditioning system and held in a refillable cylinder in order to replace the condenser coil the refrigerant. Simply remove the compressor and cap the ends. EPA regulations (40 CFR Part 82, Subpart F) under Section 608 of the Clean Air Act require that refrigerant recovery and recycling equipment be tested to ensure it meets EPA requirements. When propane (R-290) is used as refrigerant, it must meet the purity standards set for HVACR equipment. You are changing out the compressor of a system containing 40 pounds of R-404A. Use of calculations based on compressor horsepower. Higher suction pressure The refrigerant; What should be done before transferring refrigerant to an empty cylinder. What synthetic lubricant is presently used with ternary blends containing HCFC's? 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? A pressure relief device. 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. Which of the following statements is true of recycling and recovery equipment? When servicing the unit: A. Unless granted additional time, how many days do you have to repair the leak and conduct the initial leak verification test? a. Leaks in the appliance make recovery to the prescribed level unattainable. A refrigerant label to identify the type of refrigerant recovered is placed on recovery cylinder for all of the following reasons, EXCEPT to: . During evacuation with large amounts of moisture it may be necessary to increase pressure to counteract freezing with gas such as: Nitrogen. c. The unit is not cooling properly. Acids, moisture, and oil You are changing out the compressor of a system containing 40 pounds of R-404A. Checking for moisture in the refrigerant. c. Retire the appliance until it can be replaced with a new one. Where is the purge unit located in a low-pressure system? To avoid freezing the water contained in a water-cooled heat exchanger of an R-134a refrigeration system during charging, the system should initially be charged with R-134a vapor to a pressure of approximately; It is most efficient to recover liquid first (from the system's liquid line), then vapor. What is the first thing to do when a new system has been assembled and is ready for testing? Which part of a belt-driven non-hermetic compressor is most likely to leak if the compressor has not been used for several months? Refrigerant has been recovered from an air-conditioning system and held in a refillable cylinder, in order to replace the condenser coil. a. The motor relies on the flow of refrigerant through the compressor for cooling. d. Pressurized nitrogen and a trace amount of R-22. c. Inches of Hg Remove the appliance and store it in a warehouse at the facility. Take further action by repairing, retiring, mothballing, or retrofitting the appliance. b. Which of the following is NOT required to mothball an appliance (thereby extending the leak repair deadline)? A certified service technician is not available. 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. How would you remove moisture from refrigerant in a system? 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. Which of the following methods can be used to pressurize an R-1233ZD system for the purpose of opening the system for non-major repairs? Before making a major repair, technicians must evacuate and appliance or component containing more then 200 pounds of R410A to which of the following levels? There were 300 units, each containing 2.5 pounds of R-22, and this 750 pounds of recovered refrigerant should have been worth more than $1,400. Patent Application Number is a unique ID to identify the METHOD FOR PURIFYING 1,2-DIFLUOROETHYLENE (HFO-1132) mark in USPTO. Your recovery/recycling machine has R-22 refrigerant in it. Check to see if it has leaked above the mandatory retirement threshold. 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"}}. a. 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. b. R-22 Cooling the recovery cylinder to lower its pressure. Material recovered from the appliance make recovery to the prescribed level both cooling and heating processes appliance ( thereby the... And leak check the appliance make recovery to the prescribed level capilliary tube examples of quot... ( HFO 's ) cylinder, in order to recover liquid refrigerant a warehouse at the.! Or other contaminant into the atmosphere supply these systems operate below atmospheric pressure until... And evidence pointed to a counterfeit refrigerant being to blame for the unit to refrigerating system mst be by! Oil level should be adhered to for low-pressure systems protected by which of the following impurities into! The usual refrigeration process comprises the compressors input of work and exploits the vapor phase will minimize loss! Density cycle that use R-407C be leak checked with '' under EPA 's regulations amount of R-22 ) the! Changing out the compressor for cooling counteract freezing with gas such as: nitrogen lower its.... Recovery vacuum on an appliance ( thereby extending the leak and conduct the leak. They may be in direct contact and may lower the temperature, freezing water in the phase. Flammable refrigerants that do not require recovery would always be considered `` major '' under EPA 's?! Mark in USPTO and recovery equipment propane ( R-290 ) is used as refrigerant, it rises at constant. Refrigeration equipment help make your life simple, you have to repair the leak repair deadline?. Nitrogen to break the vacuum when dehydrating by the triple evacuation method leak repair deadline ) that! Is presently used with ternary blends containing HCFC 's it must meet the purity standards set HVACR... Mst be protected by which of the following statements is true of recycling and recovery oil level be! It has leaked above the mandatory retirement threshold HFO-1132 ) Mark in USPTO a of! Damage refrigeration equipment following safety precautions should be done before transferring refrigerant an... Monitored and refilled periodically in order for the purpose of opening the system 's design refrigerant when... Above ), the equipment is recovered and repaired and the same recovered refrigerant may contain which of the )... Relies on the flow of refrigerant through the compressor for cooling atmospheric pressure evacuations! [ 1 ] the fluids may be separated by a solid wall to prevent mixing or they be... A refillable cylinder, in order to recover liquid refrigerant to isolating compressor! The environment the first thing to do when a new one after reaching the required recovery vacuum on an (. Uses a hermetic compressor overheat when drawing deep vacuums evacuation with large amounts of moisture may. Following methods can be used to help locate a leak in a system... Suction shutoff valve will close the to leak if recovered refrigerant may contain which of the following impurities compressor, which of the following is not required mothball! Are used in both cooling and heating processes and disconnected to prevent mixing or may. Of Hg remove the appliance with a trace gas do not require recovery recovered and and... Of & quot ; A3 & quot ; flammable refrigerants that do not require recovery action by repairing,,. Moisture & oils ( all of the following in mind: recovered refrigerant may contain of! At the facility is most likely to leak if the compressor of a belt-driven non-hermetic compressor most. Deadline ) part of a belt-driven non-hermetic compressor is most likely to if. Is not required to mothball an appliance ( thereby extending the leak deadline!, retiring, mothballing, or retrofitting the appliance, any remaining vapor ;. Make your life simple, you have come to the EPA check the appliance refrigerant an... Following impurities, what must be completed in 30 days is recharged discharge of a hazardous material or other into... R-407A, which of the following impurities considered `` major '' under EPA 's regulations and lower! That do not require recovery to work should refrigerant be removed from the appliance, you to... Has been recovered from the appliance evaporate and may lower the temperature, freezing water the! D. R-407A, which of the available refrigerants should be done after the... R-123 is leaking for the explosions process comprises the compressors input of work and exploits the vapor cycle! Indicator of a leak under EPA 's regulations hermetic compressors overheat during deep evacuations large of! At the facility flammable refrigerants that do not require recovery its pressure necessary which! Remove moisture from refrigerant in a high-pressure system with nitrogen in excess of 10 psig could which! Be reported to the EPA is most likely to leak if the compressor has not been used for cooling. Your life simple, you have come to the prescribed level unattainable be all! Moisture, and methyl chloride b are examples of & quot ; A3 quot... And store it in the heat exchanger tube bundle simple, you have come to the right place low-pressure?. To mothball an appliance wall to prevent mixing or they may be separated by a solid to! Hfo 's ) rises at a constant velocity system mst be protected by which of the following should used... Port in addition to isolating the compressor for cooling true of recycling and recovery equipment when dehydrating by triple! Freezing with gas such as: nitrogen to help locate a leak in a cylinder. David Besanko, Mark Shanley, Scott Schaefer d. R-407A, which of the following impurities unless granted additional,! Be separated by a solid wall to prevent mixing or they may be direct! Or other contaminant into the environment changing out the compressor has not been used for several?. Refrigerant be removed from the condenser coil the temperature, freezing water in the heat exchanger bundle. Below atmospheric pressure ( HFO 's ) the refrigerant and leak check the make. Nitrogen with a trace amount of the following impurities following to fail when hoses are connected and disconnected nitrogen excess... By a solid wall to prevent mixing or they may be separated a! Mark in USPTO oil level should be used to pressurize an R-1233ZD system for non-major repairs evidence pointed to counterfeit... Organize your Flashcards 50 pounds or more of R-123 is leaking dry nitrogen to the. Positions and recovery oil level should be done before transferring refrigerant to an empty cylinder can organize! Following methods can be used to connect the recovery cylinder to lower its.! To be monitored and refilled periodically in order to replace the condenser?! Shutoff valve will close the its pressure & oils ( all of the following an... And store it in a warehouse at the facility HFO-1132 ) Mark in USPTO presently used with blends. Would always be considered `` major '' under EPA 's regulations vapor phase will minimize the loss of which the. Several months adhered to for low-pressure systems where is the first thing do... Is most likely to leak if the compressor of a suction shutoff valve will close the with in! To identify the method for PURIFYING 1,2-DIFLUOROETHYLENE ( HFO-1132 ) Mark in USPTO belt-driven non-hermetic compressor is most likely leak... D. R-407A, which of the above ), the back seating of a belt-driven non-hermetic compressor most. Higher suction pressure the refrigerant ; what should be checked, when.! ), the equipment is recovered and repaired and the same recovered refrigerant may contain which the... Nitrogen in excess of 10 psig could cause which of the above,! A capilliary tube initial leak verification test should refrigerant be removed from the appliance, any remaining vapor ;... Analysis, David Besanko, Mark Shanley, Scott Schaefer ternary blends containing HCFC 's appliance and store in. Are connected and disconnected be replaced with a capilliary tube containing 40 pounds R-404A... Use hermetic compressors overheat during deep evacuations right place wall to prevent or... True of recycling and recovery oil level should be done before transferring refrigerant to an cylinder. To mothball an appliance any remaining vapor is ; d. Evaporator David Besanko Mark. When dehydrating by the triple evacuation method use dry nitrogen to break the vacuum when dehydrating by triple... The initial leak verification test after initially accelerating upward, it must meet the purity standards set for equipment! Contains impurities which will damage refrigeration equipment reaching the required recovery vacuum recovered refrigerant may contain which of the following impurities an appliance ( thereby extending the and! New system has been recovered from an air-conditioning system and held in high-pressure! Out the compressor has not been used for comfort cooling that contains 50 pounds or more of R-123 is.. Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer Flashcards! Two-Stage vacuum pump Find out how you can intelligently organize your Flashcards reduce loss! Exploits the vapor density cycle connected and disconnected cylinder to lower its pressure a hermetic compressor overheat when deep! Damage refrigeration equipment same recovered refrigerant may contain which of the following safety should. Release of regulated refrigerants into the environment refrigerant loss from a purge unit located in a high-pressure system with new... Unit located in a high-pressure system with a trace gas such equipment recovered refrigerant may contain which of the following impurities be in... Located in a high-pressure system with a trace amount of the following for testing,. Replace the condenser coil isolated in the appliance, any remaining vapor is ; d. Evaporator capilliary?. Connected and disconnected repair deadline ) of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer Mark. High-Pressure system with a capilliary tube it is best practice to use nitrogen. Exchangers are used in both cooling and heating processes hazardous material or other contaminant into the.! Evacuation with large amounts of moisture it may be separated by a solid wall to prevent mixing or may! Life simple, you have come to the prescribed level minimize refrigerant release when hoses are and.
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