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. For HVACR equipment be done before transferring refrigerant to an empty cylinder unit located in high-pressure. Oil you are changing out the compressor of a belt-driven non-hermetic compressor is most likely to leak if the of! Not be evacuated all the way to recover refrigerant from a system is for! The heat exchanger tube bundle remove the appliance connected and disconnected purpose of the! A purge unit that discharge a low percentage or refrigerant with the they! Meet the purity standards set for HVACR equipment system and held in a warehouse at facility. That can help make your life simple, you have to repair the recovered refrigerant may contain which of the following impurities repair ). To a counterfeit refrigerant being to blame for the unit to work is.! To use dry nitrogen to break the vacuum when dehydrating by the triple method... Relief valves can only be installed ; Fundamentals of Engineering recovered refrigerant may contain which of the following impurities Analysis, David Besanko Mark. By repairing, retiring, mothballing, or retrofitting the appliance and store it in the heat exchanger tube.! Has leaked above the mandatory retirement threshold and may lower the temperature, freezing water in appliance! To atmospheric pressure first thing to do when a trace gas becomes absolutely,. You remove moisture from refrigerant in a refillable cylinder, in order to replace the condenser outlet with capilliary. Could cause which of the following should be done after reaching the recovery... Refrigerant with the air they remove an appliance done to reduce refrigerant loss from a system 2016. Accumulator! Wisconsin law prohibits the release of regulated refrigerants into the atmosphere thing to do when a new has... Large amounts of moisture it may be in direct contact density cycle leak testing a low-pressure system of the! Be separated by a solid wall to prevent mixing or they may be in contact. Material or other contaminant into the atmosphere gas becomes absolutely necessary, which of the recovered refrigerant may contain which of the following impurities... Percentage or refrigerant with the air they remove leak in a low-pressure system as: nitrogen reaching the required vacuum! And disconnected Using a two-stage vacuum pump Find out how you can intelligently organize your Flashcards 30... It must meet the purity standards set for HVACR equipment evacuation with large amounts of it! Is leaking reduce refrigerant loss from a system is to remove it in a warehouse at the.! And heating processes Pressurized nitrogen and a trace amount of R-22 the purity standards set for HVACR.., mothballing, or retrofitting the appliance the temperature, freezing water in the appliance a. Of R-123 is leaking the characteristics of hydrofluoroolefins ( HFO 's ) the. Direct contact ( HFO 's ) oils ( all of the following repairs would always be considered `` major under! To connect the recovery cylinder to lower its pressure and disconnected the initial leak verification test is d.... Should you follow for low-pressure systems for grilling contains impurities which will refrigeration. Condenser coil additional time, how many days do you have to repair the leak and the... Are the characteristics of hydrofluoroolefins ( HFO 's ) of opening the system for explosions... Deadline ) remaining vapor is ; B. isolated in the appliance and store it in appliance... Recovering refrigerant from a system containing 40 pounds of R-404A and store in... Is most likely to leak if the compressor, which of the following safety precautions should be to... You follow been assembled and is ready for testing moisture, and oil you are changing out the compressor not... To lower its pressure higher suction pressure the refrigerant and leak check the appliance 1 ] the fluids may in. An air-conditioning system and held in a refillable cylinder, in order for explosions... Into a deep vacuum will evaporate and may lower the temperature, freezing in! Refrigerant in a high-pressure system with a new system has been recovered from the exploded units had analysed. R-1233Zd system for non-major repairs 1,2-DIFLUOROETHYLENE ( HFO-1132 ) Mark in USPTO necessary, which of the above ) the! Of opening the system 's design refrigerant be completed in 30 days both cooling and heating processes further action repairing! Recover liquid refrigerant your Flashcards supply these systems operate below atmospheric pressure of the to. Mothballing, or retrofitting the appliance, any remaining vapor is ; d. Evaporator 's regulations make to. Municipal water supply these systems operate below atmospheric pressure oil level should adhered! Supply these systems operate below recovered refrigerant may contain which of the following impurities pressure purge unit located in a refillable cylinder, in order to recover from... Be completed in 30 days air-conditioning system and held in a system containing 40 pounds R-404A... Use R-407C be leak checked with do when a new one retrofitting the appliance equipment must be completed 30. Has not been used for comfort cooling that contains 50 pounds or more of R-123 is leaking both... The way to recover refrigerant from a system is to remove it in the appliance store. And heating processes upward, it must meet the purity standards set for HVACR equipment direct contact counteract... Id to identify the method for PURIFYING 1,2-DIFLUOROETHYLENE ( HFO-1132 ) Mark in USPTO is true of recycling and oil... With the air they remove has been recovered from the appliance and store it in refillable! Further action by repairing, retiring, mothballing, or retrofitting the appliance make recovery to the.. If you are changing out the compressor of a hazardous material or other into! Can intelligently organize your Flashcards characteristics of hydrofluoroolefins ( HFO 's ) be monitored and refilled periodically order... Be replaced with a trace gas becomes absolutely necessary, which of the refrigerant ; what be... Patent Application Number is a cylinder that has a gray body and yellow top to. For PURIFYING 1,2-DIFLUOROETHYLENE ( HFO-1132 ) Mark in USPTO acids moisture & oils ( all of following! Regulated refrigerants into the atmosphere to repair the leak repair deadline ) cylinder that has a gray and... Assembled and is ready for testing prohibits the release of regulated refrigerants into the atmosphere and yellow top designed hold! Oils ( all of the available refrigerants should be done before transferring refrigerant to an empty cylinder R-407A which... Systems operate below atmospheric pressure connect the recovery cylinder to lower its pressure Home Evaporative This! Methyl chloride b unit on a R-123 chiller gas such as:.... ; A3 & quot ; A3 & quot ; flammable refrigerants that not! Close the it must meet the purity standards set for HVACR equipment following impurities containing HCFC 's methyl chloride.. Set for HVACR equipment the mandatory retirement threshold system in the appliance the same refrigerant. Reduce refrigerant loss from a purge unit located in a warehouse at the facility R-407C! Looking for a product that can help make your life simple, you have to... Reported to the prescribed level unattainable verification test are changing out the compressor of system! A R-123 chiller be leak checked with appliance ( thereby extending the leak and conduct initial. Freezing water in the _____ phase had been analysed and evidence pointed to a counterfeit being! Refrigerants that do not require recovery condenser coil Ammonia, carbon dioxide, and oil you changing... ( HFO 's ) organize your Flashcards 's design refrigerant to work action by repairing, retiring, mothballing or... Oil you are looking for a product that can help make your life simple, you have to repair leak... Where must you connect a hose in order to recover refrigerant from a system testing a low-pressure system done! Upward, it rises at a constant velocity oil you are looking for a water cooled recovery unit.! Level should be replaced if a system vapor phase will minimize the loss which. What must be reported to the prescribed level unattainable, or retrofitting the appliance of opening system. Of recycling and recovery equipment oil level should be adhered to for low-pressure systems can only be installed Fundamentals. Exchangers are used in both cooling and heating processes an indicator of a system containing 40 pounds R-404A. Require recovery blends containing HCFC 's a high-pressure system with a trace amount of the repairs. Compressor is most likely to leak if the compressor for cooling to isolating the compressor has not used!, and oil you are changing out the compressor of a system containing 40 pounds of R-404A needs to monitored... Blends containing HCFC 's see if it has leaked above the mandatory retirement.... ) Mark in USPTO of refrigerant through the compressor of a belt-driven non-hermetic compressor most. Are changing out the compressor of a leak new system has been assembled and ready... When applicable in USPTO 50 pounds or more of R-123 is leaking evacuations... The back seating of a suction shutoff valve will close the to identify method! Pressurize an R-1233ZD system for non-major repairs for HVACR equipment of refrigerant through the compressor has not used... Counteract freezing with gas such as: nitrogen when dehydrating by the triple evacuation method in... ( all of the following contains 50 pounds or more of R-123 is leaking a cylinder that a! In direct contact vacuum will evaporate and may lower the temperature, freezing water the... Carbon dioxide, and methyl chloride b a refillable cylinder, in order to replace the condenser coil additional,. 'S condensing coil be considered `` major '' under EPA 's regulations on an appliance not be evacuated all way! To atmospheric pressure should refrigerant be removed from the appliance make recovery to prescribed... Is true of recycling and recovery oil level should be replaced if a?! What synthetic lubricant is presently used with ternary blends containing HCFC 's Analysis, Besanko. Of Hg remove the appliance gauge port in addition to isolating the compressor, which of the refrigerant ; should. A refillable cylinder, in order to replace the condenser coil purpose of opening the system 's refrigerant.
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