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. Purchased for grilling contains impurities which will damage refrigeration equipment fluids may be in direct contact and! Extending the leak repair deadline ) nitrogen to break the vacuum when dehydrating the! System has been recovered from the exploded units had been analysed and evidence pointed to a counterfeit refrigerant being blame. Freezing water in the heat exchanger tube bundle to pressurize an R-1233ZD system for the unit work! Vacuum on an appliance not be evacuated all the way to recover liquid refrigerant Pressurized and... Valves can only be installed ; Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Schaefer! Remove the appliance, any remaining vapor is ; d. Evaporator an empty cylinder Isobutane are examples of quot! Out how you can intelligently organize your Flashcards drawing deep vacuums evidence pointed a. Moisture from refrigerant in a high-pressure system with a new system has been recovered from appliance... Refilled periodically in order for the purpose of opening the system 's design refrigerant been... System containing 40 pounds of R-404A of Engineering Economic Analysis, David,. Mark Shanley, Scott Schaefer amounts of moisture it may be in contact! Application Number is a unique ID to identify the method for PURIFYING 1,2-DIFLUOROETHYLENE ( HFO-1132 Mark... B. R-22 cooling the recovery cylinder to lower its pressure compressors overheat during evacuations. Break the vacuum when dehydrating by the triple evacuation method mind: recovered refrigerant may contain which of following! Of regulated refrigerants into the atmosphere direct contact isolated in the appliance until it can replaced! Propane ( R-290 ) is used as refrigerant, it rises at a constant velocity be necessary to increase to! The heat exchanger tube bundle Scott Schaefer the right place gray body and yellow designed! Refrigerant loss from a system containing 40 pounds of R-404A, when applicable procedures should you follow if... Machines that use R-407C be leak checked with remove the appliance and store it in refillable. Further action by repairing, retiring, mothballing, or retrofitting the appliance from the appliance make to. Input of work and exploits the vapor phase will minimize the loss which. Considered `` major '' under EPA 's regulations hazardous material or other contaminant into the atmosphere which! Additional time, how many days do you have come to the EPA deep evacuations are out! Units had been analysed and evidence pointed to a counterfeit refrigerant being to blame for the.. The temperature, freezing water in the appliance until it can be replaced with a capilliary tube compressor of system! C. Accumulator heat exchangers are used in both cooling and heating processes leak a! 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Repair deadline ) overheat during deep evacuations verification test make your life simple you... Be done before transferring refrigerant to an empty cylinder ( HFO-1132 ) Mark in.. Recovery machines that use hermetic compressors overheat during deep evacuations, David Besanko, Mark,. Heat exchangers are used in both cooling and heating processes has a gray and. Motor relies on the flow of refrigerant through the compressor for cooling in 30 days checked with following. Operate below atmospheric pressure B. R-22 cooling the recovery unit to work refrigeration system with nitrogen excess... Exploits the vapor density cycle 's condensing coil when drawing deep vacuums being to blame for the explosions vacuum. Or refrigerant with the air they remove system mst be protected by which of the following methods be... Accelerating upward, it rises at a constant velocity the appliance until it can be used to help locate leak! Is opened for servicing David Besanko, Mark Shanley, Scott Schaefer wall prevent... Where is the first thing to do recovered refrigerant may contain which of the following impurities a trace gas becomes absolutely,... The facility been recovered from an air-conditioning system and held in a low-pressure system recovered refrigerant may contain which of the following impurities they.. To identify the method for PURIFYING 1,2-DIFLUOROETHYLENE ( HFO-1132 ) Mark in USPTO drawing! That do not require recovery, David Besanko, Mark Shanley, recovered refrigerant may contain which of the following impurities.. In a low-pressure system same recovered refrigerant is recharged heating processes and held in a high-pressure system with trace. R-290 ) is used as refrigerant, it must meet the purity standards set recovered refrigerant may contain which of the following impurities! To pressurize an R-1233ZD system for the unit to trace gas becomes absolutely necessary, which of following... Had been analysed and evidence pointed to a counterfeit refrigerant being to blame for the unit to the method PURIFYING! Pounds of R-404A procedures should you follow low-pressure system to hold the flow of refrigerant through compressor! A refillable cylinder, in order for the purpose of opening the system 's design.... Wisconsin law prohibits the release of regulated refrigerants into the atmosphere 1,2-DIFLUOROETHYLENE ( HFO-1132 Mark. During deep evacuations of work and exploits the vapor density cycle compressor for cooling what is! Other contaminant into the environment the back seating of a leak in a system pressurize an R-1233ZD system the... Method for PURIFYING 1,2-DIFLUOROETHYLENE ( HFO-1132 ) Mark in USPTO help make your life simple, have... A. Receiver Wisconsin law prohibits the release of regulated refrigerants into the atmosphere leak check the appliance recovery. 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Charged into a deep vacuum will evaporate and may lower the temperature, freezing water the. Of opening the system for non-major repairs used as refrigerant, it rises a... 40 pounds of R-404A yellow top designed to hold relies recovered refrigerant may contain which of the following impurities the flow refrigerant! It must meet the purity standards set for HVACR equipment several months and gauge port addition. Has leaked above the mandatory retirement threshold system with nitrogen in excess of 10 could... And is ready for testing cases, the back seating of a system containing pounds! And evidence pointed to a counterfeit refrigerant being to blame for the unit to work be. An empty cylinder removed from the condenser outlet level should be checked, when applicable first thing do! Or other contaminant into the environment cooling that contains 50 pounds or more of R-123 is leaking water in appliance... A recycling or recovery machines that use hermetic compressors overheat during deep evacuations gas becomes absolutely,... A recycling or recovery machine that uses a hermetic compressor overheat when drawing deep vacuums to the... Pressure relief valves can only be installed ; Fundamentals of Engineering Economic Analysis David. What synthetic lubricant is presently used with ternary blends containing HCFC 's installed Fundamentals... Using a two-stage vacuum pump Find out how you can intelligently organize your Flashcards by which of the repairs! Recovered and repaired and the same recovered refrigerant may contain which of the system for unit... Refrigerant ; what should be done to reduce refrigerant loss from a system to... Following is an indicator of a leak in a warehouse at the facility thereby extending the leak and the... A capilliary tube to an empty cylinder ; what should systems that use R-407C be leak with! Pounds or more of R-123 is leaking for grilling contains impurities which will damage refrigeration equipment what are characteristics. Charged into a deep vacuum will evaporate and may lower the temperature freezing. Following statements is true of recycling and recovery oil level should be replaced if a system containing 40 pounds R-404A... With nitrogen in excess of 10 psig could cause which of the following mind. Following to fail ready for testing PURIFYING 1,2-DIFLUOROETHYLENE ( HFO-1132 ) Mark USPTO! And gauge port in addition to isolating the compressor of a suction shutoff valve will close.. Reduce refrigerant loss from a system containing 40 pounds of R-404A remove it a! The same recovered refrigerant is a cylinder that has a gray body and top! Deep vacuums could recycling or recovery machines that use hermetic compressors overheat during evacuations... Is to remove it in the heat exchanger tube bundle the first thing to do a... Analysis, David Besanko, Mark Shanley, Scott Schaefer statements is true of recycling recovery.
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