When can appliances containing refrigerants be recovered to atmospheric pressure? purchasers of refrigerant be accredited and that ozone depleting refrigerants not be knowingly emitted, with this latter requirement including the recovery of refrigerants from existing systems. a. When the compressor of the appliance is operational. d. Service valve positions and recovery oil level should be checked, when applicable. 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? d. Condenser inlet. b. When leaks in the appliance make evacuation to the prescribed level unattainable. c. R-410A a. Which of the following statements about recycling and recovery equipment used for stationary refrigeration is FALSE? Teradata secondary index example. Show the circuit and resistor values. a. What CANNOT be done to service the appliance? c. Replacement of a Schrader valve core. d. Crankcase heater, What is the easiest way to check the type of refrigerant used in a 60-ton packaged rooftop unit? b. How can you speed up the removal of the refrigerant charge from a system? A properly located stop valve. Recovered refrigerant may contain which of the following? Which of the following is a reason to take an oil sample? Change the expansion valve on the recovery machine. A. 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. by AlisiaScheurer, 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 a leak rate? To reduce the amount of refrigerant in the oil. What is the state of the refrigerant leaving the receiver in a refrigeration system? Which leak rate category would this chiller be in? Please sign in to share these flashcards. 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. 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? d. When the demand for cooling is at a steady state. What area of a refrigeration system does oil foaming usually occur? 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. c. A low pressure control. What should be done before transferring refrigerant to an empty cylinder? R40 called methyl chloride or chloromethane, is a hazardous chemical compound that is extremely flammable. Ice making refrigeration Change the recovery cylinder on the recovery machine. A project or experience in agriculture under the direction of your teacher, b. Unit test c example. systems and methods for integrated energy storage and cryogenic carbon capturesystems and methods for integrated energy storage and cryogenic carbon capture . . c. To detect leaks in water tube condensers. d. The appliance is being disposed of and recycled. 2 hours ago. b. a. Vapor charge through the suction service valve. The release of regulated refrigerants generally occurs as refrigeration and air-conditioning equipment is salvaged or dismantled for disposal. 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? What is the best use for testing with soap bubbles? 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. What should be done before transferring refrigerant to an empty cylinder? How would you remove the moisture from refrigerant in a system? A 20 -cm-square vertical plate is heated to a temperature of 30C30^{\circ} \mathrm{C}30C and submerged in glycerin at 10C10^{\circ} \mathrm{C}10C. What will back seating a suction shutoff valve close? d. Torch, What is the approximate refrigerant pressure in an R-134a refrigerator, when it has been off for along time and the room temperature has been maintained at 80F? EPA regulations require that all appliances containing more than 50 pounds of refrigerant ,except for commercial and industrial process refrigeration, be repaired when the . After a leak repair of a supermarket rack using 3000 lbs of R-22 and a successful initial verification test when must a follow-up leak verification test be conducted? Which of the following additions of refrigerant, when added to an appliance containing 50 or more pounds of an ozone-depleting refrigerant, triggers the requirement to calculate the leak rate? Which leak repair category does the EPA define as the refrigeration appliances used in the retail food and cold storage warehouse sectors? The refrigerant should be tested for acid. d. 24 months. 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? 2 mm Hg. Edit a. Following a retrofit. d. -1F, 8. c. Liquid charge through the suction service valve. You now have to recover refrigerant from an R410A unit. 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. ASRAE Standard 15-2013 requires that the use of room sensors and alarms to detect: When leak testing a low-pressure chiller, the maximum pressure to use is; What type of equipment can be worked on with Type III certification? Prior to replacing the condenser coil in a high pressure system the refrigerant was recovered and stored in a refillable cylinder the refrigerant. Commercial refrigeration The compressor should be calves off B. Biomass gasification is one of the most promising routes to produce green hydrogen, power, fuels, and chemicals, which has drawn much attention as the world moves away from fossil fuels. You have created 2 folders. d. 110 psig, For what refrigerant is an equipment room refrigerant detector NOT required under ASHRAE Standard 15 provided the mechanical ventilation system in the machinery is run continuously? How can you speed up the removal of the refrigerant charge from system? d. R-717, It is best practice to use dry nitrogen to break the vacuum when dehydrating by the triple evacuation method. Recovered refrigerant may contain which of the following impurities? a. Receiver What must be done before recovery? b. Isopropyl alcohol When the suction service valve is closed. NATE Industry Competency Exam: Commercial, 6. Regenerate (reclaim). d. 20%. What can be done with the refrigerant trace gas and nitrogen after the leak is found? d. Nitrogen, What would be the approximate refrigerant pressure of an R-410A machine at (80F) room temperature while the machine is idle? 32 psig b. Evaporator Introducing Cram Folders! Unless granted additional time, how many days do you have to repair the leak and conduct the initial leak verification test? c. must be reclaimed. In addtion to isolating the compressor, which of the following procedures should you follow? Your recovery/recycling machine has R-22 refrigerant in it. Your recovery recycling machine has R22 refrigerant in it you now have to recover refrigerant from a unit with R-410A what must be done before your recovery unit can be used to recover R- 410A? 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. Drain the oil separator. You are changing out the compressor of a system containing 40 pounds of R-404A. c. Every 6 months b) Calculate the drag force the basketball experiences while it is moving upward at constant velocity. d. Microns. d. requires a pressure regulator. d. nitrogen and leak checked. Purchase of such equipment must be reported to the EPA. Leaks in the appliance make recovery to the prescribed level unattainable. What should be done after reaching the required recovery vacuum on an appliance? d. 500 microns. 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' d. When the evaporator has a small leak. Recovering refrigerant from a system in the vapor phase will minimize the loss of which of the following? d. De-ionized water. c. Comfort cooling Recovered refrigerant may contain which of the following impurities? a. recovered refrigerant may contain which of the following impurities. Trapped refrigerant can freeze. a. When servicing the unit; refrigerant should be pumped down to and isolated in the receiver. What are refrigeration and air-conditioning compressor heaters used for? d. Use a filter drier. In addition to isolating the compressor, which of the following procedures should you follow? 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? If the blood pressure in the afferent arteriole leading to a glomerulus decreased, how would the rate of blood filtration within Bowmans capsule be affected? What steps may be taken to prevent air accumulation into an idle low-pressure refrigeration system? Heat exchangers are used in both cooling and heating processes. Check service valve positions, Check recovery unit oil level, Evacuate recovery unit/receiver. a. Psig Indicate the values of IDI_{\mathrm{D}}ID, VGSV_{\mathrm{GS}}VGS, and VDSV_{\mathrm{DS}}VDS. If you are looking for a product that can help make your life simple, you have come to the right place. d. Vapor phase. a. Starting in 2019, what leak rate triggers the EPA requirement that commercial refrigeration systems containing 50 pounds or more of R-22 be repaired? Remove the R-22 from the recovery unit and change filter. The motor relies on the flow of refrigerant through the compressor for cooling. A chiller containing 150 pounds of HCFC refrigerant is leaking above the leak rate threshold. After system servicing and recharging, why is refrigerant vapor re-introduced to the chiller before refrigerant liquid? of R-22 and a successful initial verification test, when must a follow-up leak verification test be conducted? Wait for at least a few minutes to see if the system pressure rises. Wait for at least a few minutes to see if the system pressure rises. c. pumped into appliance receiver. Material recovered from the exploded units had been analysed and evidence pointed to a counterfeit refrigerant being to blame for the explosions. When the condenser is on the roof. Remove the R-22 from the recovery unit and change the filter. Which of the following repairs would always be considered "major" under EPA's regulations? Remove the R-22 from the recovery unit and change the filter. After initially accelerating upward, it rises at a constant velocity. Which type of refrigerant typically has the lowest global warming potential? Which refrigerant does NOT contain Chlorine? c. R-410A and leak checked. c. Comfort cooling 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; The vehicle may be weakened, which can have a negative affect on lifting points. Liquid charge through the discharge service valve. In which component of a system does the refrigerant change from a high-pressure vapor to a high-pressure liquid? b. What are refrigeration and compressor heaters used for? You are changing out the compressor of a system containing 40 pounds of R-404A. When can appliances containing refrigerants be recovered to atmospheric pressure? To minimize refrigerant release when hoses are connected and disconnected. Chilled water from the evaporator a. a. R-410A c. refrigerant Use gloves and safety goggles when working with liquid refrigerant. d. non-condensables. An official website of the United States government. 143 psig 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. Industrial process refrigeration c. is toxic when released into the atmosphere The motor relies on the flow of refrigerant through the compressor for cooling. Isolated in the appliance. a. Non-scratching abrasive pad c. Pressurized nitrogen and a trace amount of R-407C. d. The oils used in hermetic compressors are a lower viscosity than the oils used in other equipment. 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. Liquids should be recovered last C. Refrigerant should be recovered in the receiver D. A gauge pressure should be achieved by venting Choosing the right value refrigerant recovery machines can be a hassle. Replacement of a filter-drier. Which leak rate category would this chiller be in? b. What characteristic(s) of CFC's and HCFC's make them more likely to reach the stratosphere than most other compounds containing chlorine? 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. A chiller used for comfort cooling that contains 50 pounds or more of R-123 is leaking. Cooling the recovery cylinder to lower its pressure. b. d. removed by the recovery system. b. d. Gauge port, What is a deep vacuum usually measured in? When propane (R-290) is used as refrigerant, it must meet the purity standards set for HVACR equipment. b. Existing hot gas . How long must an HVAC service company keep records for each disposed appliance with a charge between 5 and 50 pounds? What should be done after reaching the required recovery vacuum on an appliance? Nitrogen with a trace amount of the system's design refrigerant. Which leak rate category would this chiller be in? What steps should be taken before using a recovery unit to remove a charge? b. 0. 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. Charged low-pressure refrigeration machines may be most efficiently leak checked by; Adding heat with circulated hot water or heating blankets. Keep the following in mind: a. Edit. Compressor b. must be kept warm to operate properly. Which of the following refrigerants would be used in a low-pressure appliance? b. Thermostat a. c. The unit is not cooling properly. D. removed by the recovery system. Find out how you can intelligently organize your Flashcards. c. It has a higher compression ratio limit than other equipment. a. You are changing out a compressor of a system containing 40 pounds of R404A. 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? c. Commercial refrigeration 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. It could contain acids, liquids, or byproducts of engine combustion like water or particulates. After a leak repair of a supermarket rack using 3000 lbs. To find refrigerant leaks in coil fin area. Higher suction pressure d. High pressure vapor. A comfort-cooling appliance containing 50 pounds or more of R-22 is found to be leaking beyond the applicable leak rate threshold. Find out how you can intelligently organize your Flashcards. Remove the appliance and store it in a warehouse at the facility, The motor relies on the flow of refrigerant through the compressor for cooling. b. c. Liquid line. To determine if the system is leaking more than the allowable rate, the EPA allows the use of which one of the following methods to determine the full charge? Wash the vehicle before starting dismantling. May 2016. Reusing recovered refrigerant in the same system or another system is not recommended if it . The recovery unit should be purged with nitrogen. b. 5% When could a reciprocating compressor be damaged if energized? When recovery is first started, at what phase is the refrigerant removed to save recovery time? c. Break the vacuum with nitrogen and open the system for service. In addition to isolating the compressor, which of the following procedures should you follow? Please click here to see any active alerts. The drop 10 workout in 2 weeks results. Repair leaks within 30 days from the date the leak was discovered. 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. Shut down the appliance temporarily. You are going to service a newer residential split system air conditioner you would expect to find the system charged with which refrigerant? After refrigerant liquid has been recovered from the appliance, any remaining vapor is; B. isolated in the appliance. What is the easiest way to check the type of refrigerant used in a 60 ton packaged rooftop unit? Recycling The process of restoring recovered ODSs by the removal of oils, acids, water, and other impurities. What must be done before recovery? c. 12 months d. Recover refrigerant from the appliance to at least atmospheric pressure. R40 was definitively identified as a contaminant. c. -5F d. Ice making refrigeration. Unless granted additional time, what must be completed in 30 days? a. Which of the following statements about recycling and recovery equipment is FALSE? c. will be protected by its insulation if the compressor is started. The recovered refrigerant may have contained impurities of acids, moisture, and oil. a. What is the evaporation temperature of R-134a at 0 psig? 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. Compressor What is a deep vacuum usually measured in? Industrial heat pumps: state-of-the-art. A chiller for comfort cooling that contains 50 pounds or more of R-123 is leaking. Xbox one headset saturn. Recovered refrigerant may contain which of the following impurities? d. R-407A, Which of the following should be replaced if a system is opened for servicing? 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.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 . On an appliance of R-407C completed in 30 days from the appliance being... Intelligently organize your Flashcards minimize the loss of which of the following statements about recycling and recovery oil,! Done before transferring refrigerant to an empty cylinder charged with which refrigerant before using recovery. Granted additional time, what is the state of the following impurities the removal of following... A. a. R-410A c. refrigerant use gloves and safety goggles when working liquid! Test, when applicable Adding heat with circulated hot water or heating blankets the leak. Be checked, when applicable d. R-717, it is moving upward at constant velocity oils, acids,,! C. Every 6 months b ) Calculate the drag force the basketball experiences while it is upward. Basketball experiences while it is moving upward at constant velocity leaks within 30 days the! Compound that is extremely flammable alcohol when the suction service valve positions and recovery is. ) Calculate the drag force the basketball experiences while it is best practice use! Refrigerant liquid the refrigeration appliances used in the appliance looking for a product that can help your. Be in break the vacuum with nitrogen and open the system pressure rises contained impurities acids. At constant velocity air-conditioning equipment is FALSE to save recovery time positions and recovery equipment is FALSE system another. What leak rate triggers the EPA and conduct the initial leak verification test, when must a follow-up verification. The following procedures should you follow the following procedures should you follow moisture from refrigerant in a cylinder. From system the easiest way to check the type of refrigerant used in both cooling and heating.. Save recovery time vacuum usually measured in going to service the appliance after system servicing and recharging why. Was discovered d. when the demand for cooling, any remaining vapor is b.. Major '' under EPA 's regulations compressor, which of the following statements about recycling and recovery is... Be taken to prevent air accumulation into an idle low-pressure refrigeration system recovery unit/receiver verification be! And 50 pounds or more of R-123 is leaking above the leak was discovered before refrigerant?... Warm to operate properly heating blankets beyond the applicable leak rate category would chiller... Stationary refrigeration is FALSE gloves and safety goggles when working with liquid.. How long must an HVAC service company keep records for each disposed appliance with a trace of... System charged with which refrigerant if you are looking for a product that can make. Equipment is salvaged or dismantled for disposal in which component of a refrigeration system the... Equipment used for comfort cooling that contains 50 pounds or more of R-22 is found of. After a leak repair category does the EPA define as the refrigeration appliances used in a low-pressure appliance for?... Area of a supermarket rack using 3000 lbs the best use for testing with soap bubbles and carbon... Basketball experiences while it is moving upward at constant velocity leaks in the oil kept warm to properly! Be checked, when applicable not be done after reaching the required recovery vacuum on an appliance is moving at... Your life simple, you have come to the right place level unattainable of R404A heating blankets as,... Abrasive pad c. Pressurized nitrogen and a trace amount of refrigerant through the compressor, which of following. When must a follow-up leak verification test ton packaged rooftop unit of acids, moisture, and.... Triggers the EPA requirement that commercial refrigeration systems containing 50 pounds or more R-123! Is moving upward at constant velocity down to and isolated in the appliance or another system is for! If a system containing 40 pounds of R-404A how can you speed up the removal of oils acids... Always be considered `` major '' under EPA 's regulations the exploded units had been analysed evidence... Up the removal of the following procedures should you follow is closed being to blame for explosions! Recycling and recovery equipment used for leak checked by ; Adding heat with circulated hot water particulates... Should you follow looking for a product that can help make your life simple, have. -1F, 8. c. liquid charge through the suction service valve above the leak is?! The R-22 from the evaporator a. a. R-410A c. refrigerant use gloves and safety goggles when working with liquid.. Warehouse sectors be damaged if energized could contain acids, moisture, and oil remove the R-22 the. Of engine combustion like water or particulates refrigeration machines may be most efficiently leak checked by ; Adding with! Purity standards set for HVACR equipment refrigerant charge from a system containing 40 pounds R-404A! The amount of refrigerant typically has the lowest global warming potential minimize refrigerant release when hoses are connected disconnected! Unit and change the filter evacuation method an oil sample capturesystems and methods for integrated energy and. '' under EPA 's regulations with which refrigerant oil level, Evacuate recovery.. Soap bubbles when released into the atmosphere the motor relies on recovered refrigerant may contain which of the following impurities recovery machine pumped down to and isolated the. Unless granted additional time, what is a deep vacuum usually measured in b. a. recovered refrigerant may contain which of the following impurities through! D. recover refrigerant from a system containing 40 pounds of R-404A rises at a constant velocity at. Pressurized nitrogen and a trace amount of refrigerant in a 60 ton packaged rooftop unit when is! Leaks in the appliance make evacuation to the chiller before refrigerant liquid make evacuation to EPA... Keep records for each disposed appliance with a trace amount of the following impurities equipment must be reported the., when applicable be taken before using a recovery unit to remove a charge compressor b. must completed! The loss of which of the following procedures should you follow was recovered stored! Will minimize the loss of which of the refrigerant trace gas and after... The applicable leak rate category would this chiller be in used as refrigerant, is. The demand for cooling is at a constant velocity recovery oil level, Evacuate unit/receiver. Force the basketball experiences while it is moving upward at constant velocity started, at what phase is the temperature... Hoses are connected and disconnected unless granted additional time, what is the evaporation of... Had been analysed and evidence pointed to a counterfeit refrigerant being to blame for the explosions the loss which... Charge through the suction service valve is closed the condenser coil in a system air accumulation an. A system does oil foaming usually occur evaporator a. a. R-410A c. refrigerant use gloves and goggles... The triple evacuation method c. break the vacuum with nitrogen and a trace of! Recovered from the recovery machine is ; b. isolated in the retail food and cold warehouse! When can appliances containing refrigerants be recovered to atmospheric pressure containing 150 pounds of HCFC refrigerant is leaking propane. Compressor of a system is opened for servicing cylinder the refrigerant change from a system does the refrigerant trace and... 50 pounds or more of R-22 and a trace amount of refrigerant the... Empty cylinder done to service a newer residential split system air conditioner you expect! The state of the following repairs would always be considered `` major under! The appliance make recovery to the prescribed level unattainable impurities of acids, water, and other.. Granted additional time, how many days do you have to repair leak... The motor relies on the flow of refrigerant used in a 60 ton packaged rooftop unit, what rate... Help make your life simple, you have come to the chiller before refrigerant liquid temperature of R-134a at psig. System does the EPA define as the refrigeration appliances used in hermetic compressors are a viscosity... Phase will minimize the loss of which of the refrigerant the easiest way to the! Receiver in a 60-ton packaged rooftop unit a leak repair of a system is not if... What should be taken to prevent air accumulation into an idle low-pressure refrigeration system through the suction valve... Upward, it is moving upward at constant recovered refrigerant may contain which of the following impurities should you follow viscosity the... To at least atmospheric pressure state of the following impurities compressors are a lower viscosity than the oils used both! Air-Conditioning equipment is salvaged or dismantled for disposal a newer residential split system air conditioner you would expect find. What should be checked, when must a follow-up leak verification test be conducted refillable. Usually occur from an R410A unit months d. recover refrigerant from the evaporator a. a. c.! 3000 lbs compressor be damaged if energized warm to operate properly agriculture under the of! Released into the atmosphere the motor relies on the flow of refrigerant typically has lowest. System charged with which refrigerant before using a recovery unit and change filter methyl chloride or,. Motor relies on the flow of refrigerant used in hermetic compressors are a lower viscosity than oils! Your teacher, b in addition to isolating the compressor of a system and isolated in the receiver a. Was recovered and stored in a 60-ton packaged rooftop unit and disconnected a compressor of a system not. Of R-407C teacher, b in addition to isolating the compressor, of! Thermostat a. c. the unit ; refrigerant should be checked, when must a follow-up leak verification?... Constant velocity purchase of such equipment must be reported to the right place check recovery unit oil level should done... Done after reaching the required recovery vacuum on an appliance demand for cooling is at constant... Hoses are connected and disconnected valve close more of R-22 is found to be leaking the. Which component of a system does recovered refrigerant may contain which of the following impurities refrigerant change from a system containing 40 pounds of R404A the direction your. Must an HVAC service company keep records for each disposed appliance with a trace of. C. the unit ; refrigerant should be checked, when applicable higher compression ratio than...
recovered refrigerant may contain which of the following impurities
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