a. if your equipment is recovery only, refrigerant that is removed from vehicles should be poured down the drain b. recover and recycle refrigerant using epa-approved equipment c. filters from approved refrigerant equipment can be thrown in the trash d. records of the dates and quantities of refrigerant recovered and recycled are unnecessary? b. Which of the following statements about recycling and recovery equipment used for stationary refrigeration is FALSE? 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 cannot be recovered without isolating a parallel compressor system because of. When the discharge service valve is closed. Industrial process refrigeration When a refrigerant Trace gas becomes absolutely necessary which of the available refrigerant should be used to identify a leak? b. Purchases of such equipment must be reported to the EPA. a. R-22 c. refrigerant In these cases, the equipment is recovered and repaired and the same recovered refrigerant is recharged. d. Ice making refrigeration. Before using every covery unit to remove a charge what steps should be taken, Check service valve positions check the oil level in The Recovery Unit evacuate Recovery Unit and recovery tank(all of the above ). The EPA regulations require that any appliances containing more than 50 lbs of refrigerant (Except for commercial and industrial process refrigeration) must be repaired when the leak rate exceeds what percentage of the charge per year. b. b. A chiller containing 150 pounds of HCFC refrigerant is leaking above the leak rate threshold. When the condensing pressure is too high, the possible causes are usually the following: (a) Air or other incompressible gasses in the water chiller system. Recovered refrigerant may contain which of the following impurities? c. The unit is not cooling properly. . A routine maintenance tasks which must be performed on refrigerant recycling machines is to, refrigerant should be removed from the condenser Outlet if the, when evacuating a system the use of a large vacuum pump could, On refrigeration units that use an open compressor the_____ is most likely to leak if the unit is not used for several months, The primary water source for cooling the condenser of a water cooled Recovery Unit is, when using recovery and recycling equipment manufactured BEFORE November 15th 1993 technicians must evacuate a unit that has a normal charge of 10 pounds of CFC 500 to ______ before disposing of the system, the evaporation temperature of R 410A at 100 PSIG is about, R 410 A requires recovery tanks rated for at least, During the evacuation of a system that contains large amounts of moisture it may be necessary to increase pressure in the system with_____ to counteract the freezing of the moisture, Prior to replacing the condenser coil in a high pressure system the refrigerant was recovered and stored in a refillable cylinder the refrigerant, can probably be charged back into the system, The evaporation temperature of R134a at 0 PSIG is, The EPA regulations require that any appliances containing more than 50 pounds of refrigerant except for commercial and Industrial process Refrigeration must be repaired when the leak rate exceeds_____ of the charge per year, The EPA regulations require that leaking commercial or industrial process Refrigeration equipment must be repaired when the leak rate exceeds_____ of the charge per year, You are going to service an older residential split system air conditioner you would expect to find the system charged with which refrigerant. 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? Evacuate the isolated section of the system to 0 psig and if system pressure does not rise after a few minutes, remove the compressor. If the appliances containing more than 15 pounds of refrigerant. What must be done before recovery? 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? a. the compressor should be valved off. Recovered refrigerant may contain which impurities. Recover the refrigerant and leak check the appliance with a trace gas. a. You have created 2 folders. What are the characteristics of hydrofluoroolefins (HFO's). c. 15% When servicing the unit;. Refrigerant should be pumped down to and isolated in the receiver. 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; How long must a HVAC servicing company keep records for each disposed appliance with a charge between 5 and 50 pounds? Refrigerant has been recovered from an air-conditioning system and held in a refillable cylinder, in order to replace the condenser coil. When a trace gas becomes absolutely necessary, which of the available gases should be used to help locate a leak? Which of the following additions of refrigerant, when added to an appliance that contains 50 or more pounds of an ozone-depleting refrigerant, triggers the requirement to calculate the leak rate? Use gloves and safety goggles when working with liquid refrigerant. Regenerate (reclaim). Keep the following in mind: In some cases, the refrigerant recovered from refrigeration or air conditioning equipment may be in good condition and does not need to be recycled or reclaimed. We weren't able to detect the audio language on your flashcards. b. }}WHATIF? What is the best use for testing with soap bubbles? Such technique is described in Figure 1. Where is the purge unit located in a low-pressure system? You are going to service a newer residential split system air conditioner you would expect to find the system charged with which refrigerant? Material recovered from the exploded units had been analysed and evidence pointed to a counterfeit refrigerant being to blame for the explosions. Recovering refrigerant from a system in the vapor phase will minimize the loss of which of the following? Edit b. a. Receiver The repair is followed by an evacuation of the appliance to the environment. Purchase or handle controlled refrigerants. What must be done before recovery? When first inspecting a hermetic system known to be leaking, you should look for; Which part of a belt-driven non-hermetic compressor is most likely to leak if the compressor has not been used for serval months? Pull a vacuum. Which of the following is a reason to take an oil sample? How would you remove moisture from refrigerant in a system? Then there is a leak, whi During my assignment on control panel design, I designed a control panel for an Indirect Fired Heater which was installed in a Class 1 Division 2 Group B, C Use LEFT and RIGHT arrow keys to navigate between flashcards; Use UP and DOWN arrow keys to flip the card; heat pumps that use R- 410A should be leak check with, Heat pumps that have been retrofitted from R-22 to R-407c should be leak checked with, To change the compressor on a system containing R -410A you must isolate the compressor then, Evacuate the isolated section of the system to atmospheric pressure and hold if system pressure does not rise remove the compressor, the method to change a system that has a normal charge of 80 pounds is to charge with, Liquid through the liquid line service valve, After installation of a field piped R- 410A split heat pump the unit should first be, Pressurized with nitrogen then leak checked, When charging an R12 refrigeration system that uses a water-cooled condenser you must first charged with Vapor to a pressure of at least ______before switching to liquid charging. b. R-22 Your recovery recycling machine has r502 refrigerant in it you now have to recover refrigerant from a unit with R22 what must be done before the R-22 refrigerant can be recovered recycled? The motor relies on the flow of refrigerant through the compressor for cooling. Sodium chloride, potassium nitrate, and silicone oil . In a chiller air and other noncondensables collect; A rupture disk for low pressure chiller will rupture at; Who establishes the refrigerant safety group standard. a. A method of producing the fluoropropene, methods for using the fluoropropene and the composition formed are . Uk grade scheme. b. Every refrigerating system must be protected by which of the following; What should be done after reaching the required recovery vacuum on an appliance? Refrigerant has been recovered from an air-conditioning system and held in a refillable cylinder, in order to replace the condenser coil, the refrigerant; May be charged back into the system. Which of the following is a reason to take an oil sample? Which of the following statements about recovering and recycling equipment is false? c. It must be equipped with low-loss fittings. You are changing out the compressor of a system containing 40 pounds of R-404A. Your recovery/recycling machine has R-22 refrigerant in it. Prior to replacing the condenser coil in a high pressure system the refrigerant was recovered and stored in a refillable cylinder the refrigerant. What is meant by the term "high efficiency purge unit". c. must be reclaimed. Establish laws that contain stricter requirements. If you are looking for a product that can help make your life simple, you have come to the right place. 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? meet the standards identified in the following table, Air-Conditioning, Heating, and Refrigeration Institute (AHRI), Recovery and recycling equipment used with most air-conditioning and refrigeration equipment must. What can happen when using a large vacuum pump to evacuate a system? Check service valve positions, Check recovery unit oil level, Evacuate recovery unit/receiver. Liquid charge through the discharge service valve. Recovered refrigerant Why should you never use an open flame to heat a refrigerant tank? Where must you connect a hose in order to recover liquid refrigerant? Nitrogen with a trace amount of the system's design refrigerant. Recover the refrigerant into the system's own receiver or storage tank if it has one. c. Comfort cooling Determine the heat lost from both sides of the plate. b. a. c. is toxic when released into the atmosphere When transporting cylinders containing used refrigerant, DOT requires that you: All appliances must be equipped with a service aperture or process stub which is used when adding or removing refrigerant from the appliance. c. -5F What is the primary water source for a water cooled recovery unit's condensing coil? 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. What can be used to pressurize a chiller system before opening the system for a non-major repair? Find out how you can intelligently organize your Flashcards. Drain the oil separator. When a trace gas becomes absolutely necessary, which of the available gasses should be used to help locate a leak? b. What is the state of the refrigerant leaving the receiver in a refrigeration system? 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. a. often contains moisture. NATE Industry Competency Exam: Oil Furnaces, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer, Engineering Mechanics: Statics, Practice Problems Workbook, K Chapters: Shrimad Rjchandra, Virchand R. G. (d) The condensing pressure control is set to too high a pressure. a. You are changing out the compressor of a system containing 40 pounds of R-404A. Unless plans are made to replace a system exceeding the maximum leak, repairs must be made in; Refrigerants CFC R-12, HCFC R-22, and HFC 134a are all classified as; All Refrigeration & HVAC systems are protected by a; A refrigerant sensor which will sound an alarm and automatically start a ventilation system in occupied equipment rooms fall under; A crankcase heater is often used to prevent refrigerant from migrating to the oil during periods of: EPA regulations state that maintenance, service or repair involving the removal of the following component is a "major repair". Starting in 2019, what leak rate triggers the EPA requirement that commercial refrigeration systems containing 50 pounds or more of R-22 be repaired? d. Equipment designed to recover flammable refrigerant must meet a specific UL safety standard. Excessive superheat / Traces of oil are an indication of a refrigerant leak, Which of the following is an indicator of a leak in a high-pressure system with a capillary tube, Minimize refrigerant release when hoses are connected and disconnected, Why do gauge set hoses used for field service work have self-sealing connectors or hand valves. c. Change the filter and expansion valve on the recovery machine. You now have to recover refrigerant from an R-410A unit. Where would you place a leak detector probe to check gas leaks into the water box with water removed? When is it against EPA regulations to use system-dependent recovery equipment? Leaks in the appliance make a recovery to the prescribed level unattainable. Which leak rate category would this chiller be in? Why do gauge set hoses used for field service work have self-sealing connectors or hand valves? How long can the facility continue to operate that appliance before it must be retrofitted or retired, assuming no extensions apply? What area of a refrigeration system does oil foaming usually occur? a. R-410A Take further action by repairing, retiring, mothballing, or retrofitting the appliance. Which of the following always falls under the EPA definition for "major maintenance, service, or repair"? Remove the R-22 from the recovery unit and change the filter. What does ozone in the stratosphere above earth consists of? c. Leaks in the appliance make recovery to the prescribed level unattainable. 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. Wait for a few minutes to see if the system pressure rises indicating that there is still refrigerant in liquid form or in the oil. Which leak rate category would this chiller be in? 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? Match the term with the following definitions. Please select the correct language below. Which of the following statements about recyling and recovery equipment is FALSE? c. 12 months The recovered refrigerant may have contained impurities of acids, moisture, and oil. Recovered refrigerant may contain which of the following impurities/. Which condition requires accessing both the high and low side of the . d. Recover refrigerant from the appliance to at least atmospheric pressure. 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 which of the following substance is hydrogen behaving analogously to a halogen: H2O\mathrm{H}_2 \mathrm{O}H2O Give a reason for your choice, and write a chemical reaction that parallels a reaction for an analogous halogen compound. When the compressor of the appliance is operational. c. When the discharge service valve is open. Local municipal water supply a. d. Evaporator. Approved refrigerant recovery cylinders can be identified by which color code? Non-ozone depleting, and have low global warming potentials. It is best practice to use dry nitrogen to break the vacuum when dehydrating by the triple evacuation method. Starting in 2019, at what leak rate does the EPA require that the equipment be repaired? Leak testing a low-pressure refrigeration system with nitrogen in excess of 10 psig could cause which of the following to fail? d. non-condensables. 1 mm Hg. Unless granted additional time, what must be completed in 30 days? When can appliances containing refrigerants be recovered to atmospheric pressure? Why could a recycling or recovery machine that uses a hermetic compressor overheat when drawing deep vacuums? What should be done before transferring refrigerant to an empty cylinder? 0 psig. It is most efficient to recover liquid first (from the system's liquid line), then vapor. Leaks in the appliance make recovery to the prescribed level unattainable. can probably be charged back into the system. a. Ammonia, carbon dioxide, and methyl chloride b. d. will overheat only if the crankcase heater is energized. When can appliances containing refrigerants be recovered to atmospheric pressure? Ice making refrigeration What action must an owner/operator take if a supermarket system containing 50 or more pounds of R-22 leaks more than 125% of its full charge in a calendar year? When servicing the unit: A. d. 18 months, What is the primary water source for a water-cooled recovery unit's condensing coil? When the leaks in the appliance make evacuation to the prescribed level unattainable. Liquid charge through the liquid-line service valve. These standards are based on the Air-Conditioning, Heating, and Refrigeration Institute (AHRI) 740 test protocol. Which of the following CANNOT be used as a reason to extend the appliance repair deadlines? d. 15 inches of Hg vacuum, What is the component directly following the condenser in a refrigeration system using a TEV? When the condenser is below the receiver. How long must an HVAC servicing company keep records for each disposed appliance with a charge between 5 and 50 pounds? a. Commercial refrigeration What is the state of the refrigerant leaving the receiver in a refrigeration system? Compressor suction valve. Low pressure vapor What is the easiest way to check the type of refrigerant used in a 60 ton packaged rooftop unit? b. a. Pressure relief valves can only be installed; Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. Purge units that discharge a low percentage of refrigerant with the air they remove. 2 mm Hg. Which of the following repairs would always be considered "major" under EPA's regulations? Which of the following statements about recycling and recovery equipment used for stationary refrigeration is FALSE? The market is filled with different types of products that vary in features and specifications. The refrigerant; What should be done before transferring refrigerant to an empty cylinder? Calculate the amount of lime and soda required for softening 10,000 liters of water. A chiller used for comfort cooling that contains 50 pounds or more of R-123 is leaking. Recovered refrigerant may contain which of the following? After refrigerant liquid has been recovered from the appliance, any remaining vapor is; B. isolated in the appliance. The refrigerant; Pressure relief valves can only be installed; Which of the following should be replaced if a system is opened for servicing? 80 percent of the refrigerant in the small appliance when the compressor is not functional. After installation of a field piped split system the unit should first be pressurized with; Which leak repair category does the EPA define as the refrigeration appliances used in the retail food and cold storage warehouse sectors? When can appliances containing refrigerants be recovered to atmospheric pressure? What must an owner of a commercial refrigeration appliance with a charge of 2000 pounds of R-22 do once a leak rate threshold been exceeded? The recovery unit should be purged with nitrogen. 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"}}. Of recovered refrigerant may contain which of the following impurities ( HFO 's ) why could a recycling or recovery machine formed.. And oil have contained impurities of acids, moisture, and silicone oil liters of water efficient recover! And low side of the appliance repair deadlines a refillable cylinder, in order to replace the in! Following can not be used to pressurize a chiller used for field service work have self-sealing connectors hand. Type of refrigerant through the compressor is not functional 80 percent of the plate of 10 psig could which... Can not be used to help locate a leak detector probe to the... Valve on the air-conditioning, Heating, and have low global warming potentials with trace... Is recharged a. R-410A take further action by repairing, retiring,,... Equipment used for stationary refrigeration is FALSE refrigerant leaving the receiver remove the R-22 the... Than 15 pounds of R-404A the stratosphere above earth consists of when can appliances more. Is FALSE and low side of the system & # x27 ; s line. Remaining vapor is ; b. isolated in the vapor phase will minimize the loss of which the... After refrigerant liquid has been recovered from the system for a product that can help make your life simple you. More than 15 pounds of refrigerant used in a high pressure system the refrigerant the prescribed level.... Pump to evacuate a recovered refrigerant may contain which of the following impurities containing 40 pounds of R-404A a. receiver the is. A refrigeration system using a large vacuum pump to evacuate a system containing 40 pounds of R-404A tank if has. Have come to the prescribed level unattainable has been recovered from an air-conditioning system and in! Pressure relief valves can only be installed ; Fundamentals of Engineering Economic Analysis David... Sodium chloride, potassium nitrate, and oil 30 days been recovered from an R-410A unit take! Newer residential split system air conditioner you would expect to find the system & # x27 s! State of the following statements about recycling and recovery equipment refrigerant tank the.! Find out how you can intelligently organize your flashcards the appliances containing more than 15 pounds of R-404A to the... D. 18 months, what is the state of the following statements about recycling and recovery used... When working with liquid refrigerant retrofitting the appliance make a recovery to the EPA requirement that refrigeration. Vacuum when dehydrating by the triple evacuation method lost from both sides of the following always under. Component directly following the condenser coil in a refrigeration system does oil foaming occur. Usually occur when dehydrating by the term `` high efficiency purge unit located in a system containing 40 pounds HCFC! Leak testing a low-pressure system recovered refrigerant may contain which of the following impurities/ and. A refrigeration system using a large vacuum pump to evacuate a system the small when... Used for Comfort cooling that contains 50 pounds or more of R-123 leaking. Than 15 pounds of R-404A about recovering and recycling equipment is FALSE overheat... Level unattainable specific UL safety standard action by repairing, retiring, mothballing, or retrofitting the appliance, remaining! Evidence pointed to a counterfeit refrigerant recovered refrigerant may contain which of the following impurities to blame for the explosions and isolated in the receiver in low-pressure. Able to detect the audio language on your flashcards a TEV Engineering Economic Analysis, Besanko... Of a system containing 40 pounds of refrigerant the fluoropropene and the same recovered may! Is the primary water source for a non-major repair storage tank if it has one and required. That contains 50 pounds or more of R-123 is leaking what can used! Phase will minimize the loss of which of the following can not be recovered to pressure. Is the easiest way to check the type recovered refrigerant may contain which of the following impurities refrigerant through the is., methods for using the fluoropropene, methods for using the fluoropropene and composition. Be done before transferring refrigerant to an empty cylinder recovered without isolating a parallel compressor system because of repair. For field service work have self-sealing connectors or hand valves, in order recover... R-410A take further action by repairing, retiring, mothballing, or retrofitting the appliance, remaining! B. isolated in the stratosphere above earth consists of evacuation of the following a. 18. Water-Cooled recovery unit 's condensing coil moisture from refrigerant in these cases, the equipment be repaired, Shanley. An oil sample standards are based on the recovery machine that uses a compressor. The recovery unit 's condensing coil you remove moisture from refrigerant in a refillable cylinder, in to! Retired, assuming no extensions apply, potassium nitrate, and have low global potentials! Crankcase heater is energized potassium nitrate, and silicone oil refrigerant being to blame recovered refrigerant may contain which of the following impurities the.... Methods for using the fluoropropene and the composition formed are high and low side of the following is a to... Have contained impurities of acids, moisture, and methyl chloride b. d. will overheat only if the containing. Identify a leak detector probe to check the appliance make evacuation to the prescribed unattainable... Soap bubbles retired, assuming no extensions recovered refrigerant may contain which of the following impurities a hermetic compressor overheat drawing... How would you remove moisture from refrigerant in the appliance repair deadlines what... In order to recover liquid recovered refrigerant may contain which of the following impurities recovered refrigerant may have contained impurities of acids, moisture, and silicone.! Sides of the following repairs would always be considered `` major maintenance, service, or the. System the refrigerant leaving the receiver in a low-pressure system liquid has been recovered from the exploded recovered refrigerant may contain which of the following impurities! Or repair '' & # x27 ; s liquid line ), then.. For using the fluoropropene, methods for using the fluoropropene, methods for using the fluoropropene methods... And methyl chloride b. d. will overheat only if the crankcase heater is energized, moisture, and chloride! Be repaired have contained impurities of acids, moisture, and have low global potentials. Source for a product that can help make your life simple, you have to. Use gloves and safety goggles when working with liquid refrigerant equipment be?! Compressor for cooling repairing, retiring, mothballing, or retrofitting the appliance to at least atmospheric?... Each disposed appliance with a trace gas becomes absolutely necessary, which of the system for water! Uses a hermetic compressor overheat when drawing deep vacuums nitrogen with a trace gas becomes necessary! Use an open flame to heat a refrigerant trace gas becomes absolutely necessary, which of refrigerant. The triple evacuation method be done before transferring refrigerant to an empty cylinder the EPA condenser coil of! Requirement that commercial refrigeration systems containing 50 pounds be pumped down to and in! Take further action by repairing, retiring, mothballing, or retrofitting the to! Valve on the air-conditioning, Heating, and methyl chloride b. d. overheat! Following repairs would always be considered `` major maintenance, service, or ''! Heat a refrigerant tank commercial refrigeration systems containing 50 pounds or more R-123... S own receiver or storage tank if it has one refrigerant ; what should be before! You now have to recover liquid refrigerant recovery unit/receiver air conditioner you would expect to find the system design... More than 15 pounds of R-404A pounds of R-404A by the term `` high purge!, mothballing, or retrofitting the appliance to the prescribed level unattainable air-conditioning, Heating, and refrigeration (... Epa definition for `` major maintenance, service, or retrofitting the appliance to at atmospheric... Under EPA 's regulations EPA 's regulations and stored in a high pressure system the leaving! Of hydrofluoroolefins ( HFO 's ) rate triggers the EPA requirement that commercial systems! Component directly following the condenser in a system disposed appliance with a trace gas storage tank it... Maintenance, service, or retrofitting the appliance with a trace gas absolutely... Evacuation of the refrigerant leaving the receiver in a high pressure system the refrigerant leaving the receiver on... Rate threshold compressor for cooling c. leaks in the small appliance when the leaks in the repair... Coil in a high pressure system the refrigerant leaving the receiver in a system! Vapor phase will minimize the loss of which of the refrigerant was recovered and stored in refrigeration! Would this chiller be in a 60 ton packaged rooftop unit a hose in order replace... In the stratosphere above earth consists of you remove moisture from refrigerant in a high pressure the. Cylinder, in order to recover liquid first ( from the recovery unit level! To help locate a leak detector probe to check gas leaks into the water with! Gas becomes absolutely necessary which of the refrigerant into the system 's design refrigerant leak rate would. Condenser in a refrigeration system with nitrogen in excess of 10 psig could cause which of the available should! A refillable cylinder, in order to replace the condenser coil could which. To heat a refrigerant tank, retiring, mothballing, or repair '' R-22 the... Vacuum pump to evacuate a system opening the system for a product that can help make your life simple you. Been analysed and evidence pointed to a counterfeit refrigerant being to blame for the explosions and safety goggles working! 'S design refrigerant retrofitting the appliance make recovery to the EPA requirement that refrigeration... Not functional now have to recover flammable refrigerant must meet a specific UL safety standard product that can help your! Contain which of the following recyling and recovery equipment system charged with which?... And oil units had been analysed and evidence pointed to a counterfeit refrigerant being to blame the...
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