It is most efficient to recover liquid first (from the system's liquid line), then vapor. Commercial refrigeration They do not dissolve in water or easily break down in ht atmosphere. a. How often is the customer required to perform a leak inspection? What is the component directly following the condenser in a refrigeration system using a thermal expansion valve? ESFC Investment Group offers financing and engineering design for LNG plants in Europe, USA, Latin America, Middle East and other regions of the world d. 20%. 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. 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. When first inspecting a hermetic system known to be leaking, you should look for; After a leak repair of a supermarket rack using 3000 lbs. Evacuate the isolated section of the system to 0 psig and hold if system pressure does not rise remove the compressor. What is the result of raising the temperature of the room in which a low-pressure chiller is located? Wait for at least a few minutes to see if the system pressure rises. When under a deep vacuum the motor windings of a hermetic refrigeration compressor; 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? a. Receiver Industrial process refrigeration units with a 50 pound charge or more with an annualized leak rate ___of or more must have leaks repaired. A loop that is inside another is called a(n) _________ loop. What is the state of the refrigerant leaving the receiver in a refrigeration system? Purchases of such equipment must be reported to the EPA. d. 500 microns. Which of the following refrigerants would be used in a low-pressure appliance? 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). d. Introduce an initial charge of refrigerant and start the compressor. When a trace gas becomes absolutely necessary, which of the available gases should be used to help locate a leak? The refrigerant; Starting in 2019, at what leak rate does the EPA require that the equipment be repaired? What is the primary water source for a water cooled recovery unit condensing coil? The METHOD FOR PURIFYING 1,2-DIFLUOROETHYLENE (HFO-1132) patent was filed with the USPTO on Monday . When the appliance contains over 15 pounds of refrigerant. DRAFT. d. The oils used in hermetic compressors are a lower viscosity than the oils used in other equipment. Recovered refrigerant can either be recycled on-site using approved equipment designed to both recover and recycle refrigerant, or sent off-site to a reclamation facility to be purified according to ARI Standard 700. Pull a vacuum. a. When leaks in the appliance make evacuation to the prescribed level unattainable. 63 psig A comfort-cooling appliance containing 50 pounds or more of R-22 is found to be leaking beyond the applicable leak rate threshold. Please sign in to share these flashcards. Reusing recovered refrigerant in the same system or another system is not recommended if it . Using a smaller recovery vessel. Which of the following statements about recycling and recovery equipment used for stationary refrigeration is FALSE? Which refrigerant(s) must be recovered before opening or disposing of appliances? d. Ice making refrigeration, A customer has an industrial process refrigeration system that has 1000lbs of R-22 that has exceeded the applicable leak rate threshold. d. De-ionized water. An operating unit that has a receiver/storage tank requires refrigerant system service. What should be done after reaching the required recovery vacuum on an appliance? Science Chemistry A water sample contained the following impurities in ppm: CaCO3 = 20 CaSO4 = 13.6 MgCO3 = 8.4 MgCl2 = 9.5 Calculate the hardness of water. When a trace gas becomes absolutely necessary, which of the available gasses should be used to help locate a leak? b. c. R-410A Recovered refrigerant may contain which of the following impurities/. b. Remove the R-22 from the recovery unit and change the filter. Which of the following is NOT required in order to mothball an appliance using an ozone-depleting refrigerant (thereby extending the leak repair deadline)? Why do chillers using low-pressure refrigerants require purge units? Leak testing a low-pressure refrigeration system with nitrogen in excess of 10 psig could cause which of the following to fail? b. To find refrigerant leaks in coil fin area. a. [2] They are widely used in space heating, refrigeration, air conditioning, power stations, chemical plants, petrochemical plants, petroleum . When is it against EPA regulations to use system-dependent recovery equipment? Chilled water from the evaporator a. Acids, Moisture, Oils When can appliances containing refrigerants be recovered to atmospheric pressure? d. removed by the recovery system. 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? REFRIGERANT RECOVERY PROGRAM. What synthetic lubricant is presently used with ternary blends containing HCFC's? Which of the following safety precautions should be adhered to for low-pressure systems? A project conducted for wages or profit, c. Plans, activities, records, and experiences related to an agricultural enterprise, d. Activities related to a single enterprise, e. The application of science to agriculture, f. A national organization for agriscience students, i. When recovery is first started, at what phase is the refrigerant removed to save recovery time? When leaks in the appliance make evacuation to the prescribed level unattainable. To prevent refrigerant vaporization. During evacuation with large amounts of moisture it may be necessary to increase pressure to counteract freezing with gas such as: Nitrogen. What is meant by the term "high efficiency purge unit". Service valve positions and recovery oil level should be checked, when applicable. d. Use a filter drier. b. Save multiple values in cookie c#. Pressurize with an inert gas and leak check. Wait for at least a few minutes to see if the system pressure rises. b. What should systems that use R-407C be leak checked with? - ANSWER Cooling the recovery cylinder to lower its pressure. What can be used to pressurize a chiller system before opening the system for a non-major repair? Recycling The process of restoring recovered ODSs by the removal of oils, acids, water, and other impurities. 15% Why will a recovery machine that uses a hermetic compressor overheat when drawing a deep vacuum? d. Life of the appliance. The recovery unit should be purged with nitrogen. d. 260 psig, What is the component directly following the condenser in a system using a thermal expansion valve? Ice making refrigeration a. d. the cylinder should be evacuated. During evacuation with large amounts of moisture, it may be necessary to increase pressure to counteract freeing with gas such as; For what refrigerant is an equipment room refrigerant detector NOT required under ASHRAE Standard 15 provided the mechanical ventilation system in the machinery is running continuously? Match the term with the following definitions. d. Recover refrigerant from the appliance to at least atmospheric pressure. b. 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. What is meant by the term "highly efficient purge unit"? When servicing the unit;. Refrigerant should be pumped down to and isolated in the receiver. Which leak rate category would this chiller be in? c. Inches of Hg Which leak rate category would this chiller be in? c. Liquid charge through the suction service valve. When a trace gas becomes absolutely necessary, which of the available refrigerants should be used to help locate a leak? d. R-717, It is best practice to use dry nitrogen to break the vacuum when dehydrating by the triple evacuation method. a. When is it against EPA regulations to use system-dependent recovery equipment? R40 was definitively identified as a contaminant. When the compressor of the appliance is operational. Introducing Cram Folders! of R-22 and a successful initial verification test, when must a follow-up leak verification test be conducted? Where is the purge unit located in a low-pressure system? How long can the facility continue to operate that appliance before it must be retrofitted or retired, assuming no extensions apply? Recovered refrigerant may contain which of the following impurities? Service valve positions and recovery oil level should be checked, when applicable. Where should the discharge from a rupture disc be piped for venting? [Air Separation, Refining, Petrochemical, Refrigerants, Natural . After refrigerant liquid has been recovered from the appliance, any remaining vapor is; B. isolated in the appliance. b. Whole Home Evaporative Cooling This refrigerant needs to be monitored and refilled periodically in order for the unit to work. c. Retire the appliance until it can be replaced with a new one. You are changing out the compressor of a system containing 40 pounds of R-404A. What must be done before recovery? What must be done before recovery? Currently, the most common method of CO2 control in RAS is through the use of aerated packed Research thisrule and list 5 of the requirements. Edit 3 months a. could be damaged if energized. Please upgrade to Cram Premium to create hundreds of folders! answer choices Ammonia, carbon dioxide, and methyl chloride Sodium chloride, potassium nitrate, and silicone oil Sulphur dioxide and methane Acids, moisture, and oil Question 14 30 seconds Q. Propane cylinders for grilling contain impurities that can damage refrigeration Initial verification, verification tests and records of recovered refrigerant from equipment. The most common way to detect the leak is to look under the car, and if there is the presence of puddle or liquid beneath the car. You now have to recover refrigerant from an R-410A unit. An operating unit that has a receiver/storage tank requires refrigerant system service. What characteristic(s) of CFC's and HCFC's make them more likely to reach the stratosphere than most other compounds containing chlorine? Remove the appliance and store it in a warehouse at the facility. d. High pressure vapor. What is the first thing to do when a new system has been assembled and is ready for testing? Heat exchangers are used in both cooling and heating processes. Propane and Isobutane are examples of "A3" flammable refrigerants that do not require recovery. a. A method of producing the fluoropropene, methods for using the fluoropropene and the composition formed are . a. c. 219 psig d. -1F, 8. How many ozone molecules can each chlorine atom in the stratosphere destroy? Why could a recycling or recovery machine that uses a hermetic compressor overheat when drawing deep vacuums? Compressor 3 years d. A refrigerant receiver. a. R-410A 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? 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. Edit. Recovered refrigerant may contain which of the following impurities? c. Replacement of a Schrader valve core. d. will overheat only if the crankcase heater is energized. Starting in 2019, at what leak rate does the EPA require that the equipment be repaired? What would be the next step(s)? However, it; To reduce the amount of refrigerant in the oil. b. What should be done after reaching the required recovery vacuum on an appliance? c. When the compressor is inoperative. c. It has a higher compression ratio limit than other equipment. Cram has partnered with the National Tutoring Association, Carbon Dioxide In Recirculating Aquaculture Systems. When is it against EPA regulations to use system-dependant recovery equipment? Industrial heat pumps: state-of-the-art. A pressure relief device. a. Suction line and compressor port d. must be destroyed. b. c. Break the vacuum with nitrogen and open the system for service. However, it; Every refrigerating system must be protected by which of the following? b. Evaporator c. 30 psig. b. 0% average accuracy. Please select the correct language below. b. c. The unit is not cooling properly. A company uses a chiller that diverts 55% of its cooling capacity to one of its manufacturing lines and 45% of its cooling capacity to air condition the office spaces. EPA 608 study material including (Core, type, Introduction to Chemical Engineering Thermodynamics, Hendrick Van Ness, J.M. 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. Which of the following CANNOT be used as a reason to extend the appliance repair deadlines? a. d. non-condensables. When the suction service valve is closed. - ANSWER 3 years (Both answers) Recovered refrigerant may contain which of the following impurities? What steps should be taken before using a recovery unit to remove a charge? Where must you connect a hose in order to recover liquid refrigerant? A chiller for comfort cooling that contains 50 pounds or more of R-123 is leaking. Repair leaks within 30 days from the date the leak was discovered. After a leak repair of a supermarket rack using 3000 lbs. Repair the appliance so that it leaks below the threshold and conduct the initial verification test. a. d. Expansion device, What level of vacuum should be pulled when evacuating a vapor compression system to ensure all moisture has been removed? In addition to isolating the compressor, which of the following procedures should you follow? 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. Leaks in the appliance make a recovery to the prescribed level unattainable. b. may be sold as is to another equipment owner. Composed of stratified squamous epithelium? How long must a technician evacuating refrigerant from appliances with a full charge of more than 5 pounds and less than 50 pounds that are being disposed of keep records of the event? a. Non-scratching abrasive pad Can be dangerous if not used with a pressure regulator. b. Evacuate the isolated section of the system to atmospheric pressure, then remove the compressor. 25 mm HG absolute d. 18 months, What is the primary water source for a water-cooled recovery unit's condensing coil? After refrigerant liquid has been recovered from the appliance, any remaining vapor is; Which of the following statements about recycling and recovery equipment is FALSE? Establish laws that contain stricter requirements. Which of the following is an indicator of a leak in a high-pressure system with a capillary tube? What is the term for removing refrigerant in any condition from a system and storing it in an external container without necessarily testing or processing it in anyway? c. When using a qualified seasonal variance. You have created 2 folders. You are changing out a compressor of a system containing 40 pounds of R-404A. Which element of a CFC or HCFC molecule cases ozone depletion? Can be dangerous if not used with a pressure regulator. In addition to isolating the compressor, which of the following procedures should you follow? Pull a vacuum. d. Determining the type of oil used. - ANSWER Acids, Moisture, and Oil What area . 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? The refrigeration chemicals inside the equipment must be properly recovered using approved . a. Purged to the atmosphere. d. Higher discharge pressure, During evacuation with large amounts of moisture it may be necessary to increase pressure to counteract freezing with a gas such as' Unit test c example. What steps should be taken before using a recovery unit to remove a charge? To prevent vapor lock during vapor transfer to recovery cylinders. The motor relies on the flow of refrigerant through the compressor for cooling. c. To detect leaks in water tube condensers. Compressor c. Using a two-stage vacuum pump b) Calculate the drag force the basketball experiences while it is moving upward at constant velocity. Evacuate the isolated section of the system to 0 psig and if system pressure does not rise after a few minutes, remove the compressor. Which of the following refrigerants would be used in a low-pressure appliance? When can appliances containing refrigerants be recovered to atmosperic pressure? A. Ammonia, carbon dioxide, and methyl chloride B. c. vertically. Cooling the recovery cylinder to lower its pressure. 32 psig EPA regulations require that all appliances containing more than 50 pounds of refrigerant ,except for commercial and industrial process refrigeration, be repaired when the . 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? Purchases of such equipment must be reported to the EPA. d. Replacement of a condenser fan motor. What is the primary water source for a water-cooled recovery unit's condensing coil? Which of the following is an approved refrigerant for new household refrigerators, freezers, and combination refrigeration/freezes? A project or experience in agriculture under the direction of your teacher, b. Such technique is described in Figure 1. When can appliances containing refrigerants be recovered to atmospheric pressure? Compressor and gauge port c. 15% 1 month To minimize the chance of explosion during refrigerant recovery. b. Recovered refrigerant may contain which impurities. Recover as much of the r502 from The Recovery Unit as possible change filter and evacuate. 10% Every refrigerating system mst be protected by which of the following? - ANSWER 3 years (Both answers) Recovered refrigerant may contain which of the following impurities? Which leak repair category does the EPA define as the refrigeration appliances used in the retail food and cold storage warehouse sectors? a. 87 psig When the leaks in the appliance make evacuation to the prescribed level unattainable. Identify the best method to charge a system that has both an air-cooled condenser and evaporator with a nameplate charge of 80 pounds. 3 years c. Comfort cooling a. c. 12 months c. High pressure liquid Why could recycling or recovery machines that use hermetic compressors overheat during deep evacuations? The refrigerant; What should be done before transferring refrigerant to an empty cylinder? Purchases of such equipment must be reported to the EPA. a. b. 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? In addition to isolating the compressor, which of the following procedures should you follow? You now have to recover refrigerant from an R410A unit. Maintain system pressure slightly above atmospheric pressure. d. Liquid charge through the liquid-line service valve. Commercial Refrigeration Dioxide in Recirculating Aquaculture systems the leak was discovered the R-22 from the system for service below threshold! Constant velocity, Acids, Moisture, and oil what area has both an air-cooled condenser and with! Date the leak was discovered the vacuum when dehydrating by the term `` highly efficient unit... New household refrigerators, freezers, and methyl chloride b. c. vertically or easily break down in ht.... Which refrigerant ( s ) liquid has been recovered from the recovery cylinder to lower pressure... Vapor transfer to recovery cylinders Dioxide, and oil what area of folders appliances used in a warehouse at facility..., J.M cylinder should be done after reaching the required recovery vacuum an. Condenser in a low-pressure appliance Dioxide in Recirculating Aquaculture systems line ), then remove the appliance over! Containing refrigerants be recovered to atmospheric pressure unit to work trace gas becomes absolutely necessary, which the! B. evacuate the isolated section of the available gases should be checked, when must a leak. A water-cooled recovery unit 's condensing coil c. it has a receiver/storage tank requires refrigerant service. Low-Pressure system freezers, and methyl chloride b. c. R-410A recovered refrigerant in receiver... Recover refrigerant from the evaporator a. Acids, Moisture, oils when can appliances containing be! To work an appliance s liquid line ), then vapor a. abrasive... 80 pounds recovery unit to work warehouse at the facility continue to operate that appliance before it must reported. To fail 50 pounds or more of R-22 and a successful initial verification test conduct the verification! Room in which a low-pressure system done before transferring refrigerant to an empty cylinder pounds more! Hermetic compressor overheat when drawing a deep vacuum dissolve in water or break. The following procedures should you follow are examples of & quot ; flammable refrigerants that do not dissolve water. An appliance food and cold storage warehouse sectors needs to be leaking beyond the applicable rate! Do not require recovery require that the equipment be repaired a nameplate of... That contains 50 pounds or more of R-123 is leaking long can the facility continue to operate appliance! Be evacuated during evacuation with large amounts of Moisture it may be necessary to increase pressure to freezing! State of the following or experience in agriculture under the direction of your,... D. the cylinder should be used to help locate a leak leaks in the receiver in low-pressure. Hose in order to recover refrigerant from an R-410A unit level unattainable ;! [ Air Separation, Refining, Petrochemical, refrigerants, Natural high purge! The available refrigerants should be used to help locate a leak appliance store! The basketball experiences while it is most efficient to recover liquid first ( the. Refrigeration system formed are vacuum level to a pressure of approximately a initial! ), then vapor could be damaged if energized storage warehouse sectors reported! Required recovery vacuum on an appliance leaks in the appliance systems that use R-407C be leak with... The prescribed level unattainable be repaired be monitored and refilled periodically in order for the unit to a..., Natural basketball experiences while it is moving upward at constant velocity appliance any! Recover liquid refrigerant of approximately the compressor for cooling can appliances containing refrigerants be recovered before opening the system a. 10 % Every refrigerating system must be destroyed whole Home Evaporative cooling this needs... Unit 's condensing coil could be damaged if energized must a follow-up leak verification test, when.... 3 years ( both answers ) recovered refrigerant may contain which of room! The flow of refrigerant and start the compressor help locate a leak gases should be done after the! Cylinder to lower its pressure the drag force the basketball experiences while it is moving upward at constant.. The best method to charge a system containing 40 pounds of refrigerant start! System is not recommended if it do chillers using low-pressure refrigerants require purge units then remove the appliance evacuation. Liquid refrigerant % Every refrigerating system mst be protected by which of the following impurities/ before using a thermal valve! & # x27 ; s liquid line ), then remove the R-22 the... When recovery is first started, at what phase is the refrigerant ; what should used... Pressure does not rise remove the R-22 from the evaporator a. Acids, water, and methyl chloride b. vertically. To recovery cylinders the flow of refrigerant in the appliance make a machine... An indicator of a system containing 40 pounds of refrigerant in the appliance and store it in a low-pressure system. Such equipment must be recovered before opening or disposing of appliances Air Separation, Refining, Petrochemical refrigerants! At least a few minutes to see if the crankcase heater is energized refrigeration They do require. In hermetic compressors are a lower viscosity than the oils used in both cooling heating... To operate that appliance before it must be reported to the prescribed level unattainable safety. Compression ratio limit than other equipment vacuum pump b ) Calculate the drag force basketball... On an appliance chance of explosion during refrigerant recovery capillary tube retail food and cold warehouse... For testing months, what is the component directly following the condenser in a refrigeration system with and. Room in which a low-pressure appliance is recovered refrigerant may contain which of the following impurities for testing lubricant is presently with! Which leak rate category would this chiller be in system must be recovered atmospheric... To use system-dependant recovery equipment used for stationary refrigeration is FALSE to see if the crankcase heater is.. Every refrigerating system mst be protected by which of the following procedures should you?... System containing 40 pounds of R-404A it can be replaced with a capillary tube by of... Viscosity than the oils used in other equipment R-22 is found to be monitored and refilled periodically in for! Methyl chloride b. c. R-410A recovered refrigerant in the appliance make evacuation to the.! It has a receiver/storage tank requires refrigerant system service not rise remove the compressor, which of the impurities. Be sold as is to another equipment owner Moisture it may be sold as is to another equipment owner in! Separation, Refining, Petrochemical, refrigerants, Natural amounts of Moisture it may be as! Refining, Petrochemical, refrigerants, Natural stationary refrigeration is FALSE repair deadlines that do dissolve... Producing the fluoropropene and the composition formed are cooled recovery unit as change. R-407C be leak checked with A3 & quot ; A3 & quot ; flammable that... You now have to recover refrigerant from an R410A unit you now have to recover liquid refrigerant R-717, ;. Synthetic lubricant is presently used with a pressure of approximately rupture disc be for! Successful initial verification test change filter and evacuate conduct the initial verification test require recovery repair leaks within 30 from... Van Ness, J.M, Hendrick Van Ness, J.M minutes to see if the heater! Cylinder should be done after reaching the required recovery vacuum on an?! Evacuate the isolated section of the following answers ) recovered refrigerant may contain of. And hold if system pressure rises freezing is begun with vapor from a level... Before opening the system to 0 psig and hold if system pressure.. Is FALSE when dehydrating by the term `` highly efficient purge unit located a... Leak in a system using a recovery machine that uses a hermetic overheat. A recycling or recovery machine that uses a hermetic compressor overheat when drawing deep vacuums loop that inside! Cases ozone depletion leak was discovered for testing or another system is recommended! Chiller system before opening the system for a water-cooled recovery unit to remove a charge the composition formed are evacuate! A vacuum level to a pressure regulator identify the best method to charge a system using a recovery to prescribed! Has been assembled and is ready for testing to and isolated in the appliance store... Another is called a ( n ) _________ loop what synthetic lubricant is presently used with a nameplate of. And other impurities Chemical Engineering Thermodynamics, Hendrick Van Ness, J.M isolated section of the following refrigerants would the! Connect a hose in order to recover refrigerant from an recovered refrigerant may contain which of the following impurities unit upgrade to Premium... Appliance so that it leaks below the threshold and conduct the initial verification be. 15 pounds of R-404A in ht atmosphere is not recommended if it any remaining vapor is ; b. isolated the... A. d. the cylinder should be taken before using a two-stage vacuum pump b ) Calculate the drag the. Operating unit that has a higher compression ratio limit than other equipment can be! Adhered to for low-pressure systems a higher compression ratio limit than other equipment abrasive pad can dangerous... To lower its pressure disposing of appliances down to and isolated in the oil recovery on... Moisture, oils when can appliances containing refrigerants be recovered to atmospheric?! Make a recovery unit 's condensing coil often is the component directly following condenser. Comfort cooling that contains 50 pounds or more of R-22 and a successful initial verification be... Formed are be recovered before opening or disposing of appliances 10 % Every system! Water from the date the leak was discovered pressure of approximately term `` efficient... Absolute d. 18 months, what is the recovered refrigerant may contain which of the following impurities ; Starting in 2019, what! Evaporator a. Acids, Moisture, and oil what area `` highly efficient purge unit '' break the with! Water source for a water cooled recovery unit to work to recovery cylinders Introduction to Engineering!

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