When recovering a different refrigerant type than the last refrigerant recovered using that specific recovery equipment, remove any refrigerant remaining in the recovery unit and change the unit ' s filter. c. To reduce the amount of entrained water in the receiver. What should be done after reaching the required recovery vacuum on an appliance? After refrigerant liquid has been removed from a system any remaining vapor is, In a refrigeration system with a TXV or other type of throttling device the component directly following the condenser is the. Shut down the appliance temporarily. What is the primary water source for a water-cooled recovery unit's condensing coil? - ANSWER Acids, Moisture, and Oil What area . When an appliance containing 50 pounds or more of a regulated refrigerant leaks refrigerant at an annual rate of 125% or more, what must be included on the leak inspection records submitted to the EPA? a. Which of the following repairs would always be considered "major" under EPA's regulations? 80 percent of the refrigerant in the small appliance when the compressor is not functional. A chiller used for comfort cooling that contains 50 pounds or more of R-123 is leaking. c. Water in the system can freeze. 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? d. requires a pressure regulator. To pinpoint refrigerant leaks. This refrigerant needs to be monitored and refilled periodically in order for the unit to work. Remove the R-22 from the recovery unit and change the filter. It is also possible that an employer would dispose of the outer packaging. d. horizontally. 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? When servicing the unit: A. a. Purge the condenser. An operating unit that has a receiver/storage tank requires refrigerant system service. 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. R40 called methyl chloride or chloromethane, is a hazardous chemical compound that is extremely flammable. Recovered refrigerant may contain which of the following impurities? Ice making refrigeration Introducing Cram Folders! Acids, Moisture, and Oil What area of a refrigeration system does oil foaming usually occur? You are changing out the compressor of a system containing 40 pounds of R-404A. b. d. 24 months. A company uses a chiller that diverts 55% of it cooling capacity to one of its manufacturing lines and 45% of its cooling capacity to air condition the office spaces. What steps should be taken before using a recovery unit to remove a charge? Pressure relief valves can only be installed: EPA regulations require that leaking industrial process refrigeration be repaired(or retrofitted or retired) when the leak rate exceeds; Where is the rupture disk located on a centrifugal chiller? a. Check to see if it has leaked above the mandatory retirement threshold. If a strong odor is detected during the recovery process. Which of the following refrigerants would be used in a low-pressure appliance? The recovery unit should be purged with nitrogen. Please select the correct language below. Which of the following statements about recycling and recovery equipment used for stationary refrigeration is FALSE? Which of the following statements about recycling and recovery equipment used for stationary refrigeration is FALSE? a. a. Your recovery/recycling machine has R-22 refrigerant in it. c. 90 psig Find out how you can intelligently organize your Flashcards. There were 300 units, each containing 2.5 pounds of R-22, and this 750 pounds of recovered refrigerant should have been worth more than $1,400. Recovered refrigerant Why should you never use an open flame to heat a refrigerant tank? c. 236 psig Use gloves and safety goggles when working with liquid refrigerant. a. The market is filled with different types of products that vary in features and specifications. d. Nitrogen, What would be the approximate refrigerant pressure of an R-410A machine at (80F) room temperature while the machine is idle? b. a. What should be done before transferring refrigerant to an empty cylinder? What steps should be taken before using a recovery unit to remove a charge? a. Purged to the atmosphere. An initial leak verification test failed after repairing a leak in a rack refrigeration system for a supermarket using an HCFC refrigerant. Heat exchangers are used in both cooling and heating processes. A fluoropropene composition comprising Z-1,3,3,3-tetrafluoropropene, E-1,3,3,3-tetrafluoropropene, 1,1,3,3,3-pentafluoropropene, 2,3,3,3-tetrafluoropropene, and optionally 1,1,1,3,3-pentafluoropropane wherein the 2,3,3,3-tetrafluoropropene being present in an amount of 0.00001 to 1.0%. 5% c. 10 inches of Hg vacuum 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. 0% average accuracy. How can you speed up the removal of the refrigerant charge from system? a. EPA regulations require that all appliances containing more than 50 pounds of refrigerant ,except for commercial and industrial process refrigeration, be repaired when the . It is best practice to use dry nitrogen to break the vacuum when dehydrating by the triple evacuation method. Official websites use .gov 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. 212 psig However, it; Every refrigerating system must be protected by which of the following? The motor relies on the flow of refrigerant through the compressor for cooling. An operating unit that has a reciever/storage tank requires refrigerant system service. 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? a. Which refrigerant does NOT contain chlorine? Repair leaks within 30 days from the date the leak was discovered. Introducing Cram Folders! You are changing out a compressor of a system containing 40 pounds of R-404A. 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"}}. can probably be charged back into the system. a. Retrofit the appliance with a substitute refrigerant c. Lower discharge pressure How often is the customer required to perform a leak inspection? d. When the appliance is leaking. d. 260 psig, What is the component directly following the condenser in a system using a thermal expansion valve? 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? (b) The condenser surface is too small. d. De-ionized water. Match the term with the following definitions. b. oil 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. a. Ammonia, carbon dioxide, and methyl chloride b. 10% Which of the following is a reason to take an oil sample? When under a deep vacuum the motor windings of a hermetic refrigeration compressor; Recovered refrigerant may contain which of the following impurities? Microns What is the primary water source for a water cooled recovery unit condensing coil? d. The oils used in hermetic compressors are a lower viscosity than the oils used in other equipment. a. air and leak checked. Where would you place a leak detector probe to check has leaks into the water box with water removed? Which of the following is NOT required to mothball an appliance (thereby extending the leak repair deadline)? 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? Which of the following is an indicator of a leak in a high-pressure system with a capillary tube? Which leak repair category does the EPA define as air-conditioning appliances used to provide cooling in order to control heat and/or humidity in occupied facilities including, but not limited to, residential, office, and commercial buildings? A pressure relief device. a. c. When the compressor is inoperative. When propane (R-290) is used as refrigerant, it must meet the purity standards set for HVACR equipment. a. What is the leak rate threshold for comfort cooling refrigeration? The refrigeration chemicals inside the equipment must be properly recovered using approved . What should be done to reduce refrigerant loss from a purge unit on a R-123 chiller? Which of the following would always be considered "major" under EPA's regulations? 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? Recovered refrigerant may contain which of the following impurities? 15% Why will a recovery machine that uses a hermetic compressor overheat when drawing a deep vacuum? Every 3 months A loop that is inside another is called a(n) _________ loop. b. Change the recovery cylinder on the recovery machine. Which of the following safety precautions should be adhered to for low-pressure systems? The outer packages are designed to remain in place from shipment to disposal, so it is possible and intended that the refrigerant supplied in DOT-39 cylinders spend the entire life-cycle inside the fiberboard outer packaging. 32 psig This should also be taken into consideration when tilting cabs. DRAFT. 7/29/2019 b5 Ac Refrigerant Syst Serv 1/2987-161Compressor/engine applicationsEngine Manufacturer Engine codeUSA/Canada1.8L T 5V Motronic 110 KW1.8L T 5V Motronic 110 & c. will be protected by its insulation if the compressor is started. The unit has a compressor burnout. 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? An oil sample should be taken for which of the following reasons? Purchases of such equipment must be reported to the EPA. What is the state of the refrigerant leaving the receiver in a refrigeration system? evacuate recovery unit-receiver. Acids, Moisture, Oils When can appliances containing refrigerants be recovered to atmospheric pressure? b. What is the evaporation temperature of R-134a at 0 psig? A low pressure chiller used for comfort cooling must be repaired if it has an annual leak rate of___ of the total charge. a. b. A purge unit that discharge a low percentage or refrigerant with the air they remove. d. The valve seats can freeze. The compressor should be calves off B. To reduce the amount of refrigerant in the oil. #2 EPA 608 Type II. NATE Industry Competency Exam: Commercial, 6. Compressor and gauge port Recovered refrigerant may contain which of the following impurities? A refrigerant label to identify the type of refrigerant recovered is placed on recovery cylinder for all of the following reasons, EXCEPT to: . How would you remove the moisture from refrigerant in a system? Using a smaller recovery vessel. a. a. What is meant by the term "highly efficient purge unit"? b. A. a. R40 was definitively identified as a contaminant. Evacuate the isolated section of the system to 0 psig and hold if system pressure does not rise remove the compressor. b. How long must an HVAC servicing company keep records for each disposed appliance with a charge between 5 and 50 lbs? When the appliance contains over 15 pounds of refrigerant. A heat exchanger is a system used to transfer heat between a source and a working fluid. To find refrigerant leaks in coil fin area. (c) Too much charge in the refrigeration system (liquid recovery in the condenser). d. Recycled refrigerant has been added to unit. When the condenser is on the roof. Purge units that discharge a low percentage of refrigerant with the air they remove. An official website of the United States government. a. En un movimiento circular uniforme, cules de las siguientes magnitudes son constantes: la rapidez, la velocidad instantnea, la aceleracin centrpeta, la magnitud de la fuerza neta? b. There FUNCTIONAL STEPS OF HOW OIL-FREE AIR COMPRESSOR WORK? The appliance is located in an area that is subject to radiological contamination. Take further action by repairing, retiring, mothballing, or retrofitting the appliance. What is meant by the term "high efficiency purge unit". b. c. Recover the refrigerant from the isolated section or component. You are changing out the compressor of a system containing 40 pounds of R-404A. d. Evaporator. b. requires a minimum of 10 psig In addition to isolating the compressor, which of the following procedures should you follow? The METHOD FOR PURIFYING 1,2-DIFLUOROETHYLENE (HFO-1132) patent was filed with the USPTO on Monday . d. 15 inches of Hg vacuum, What is the component directly following the condenser in a refrigeration system using a TEV? Before transferring refrigerant to an empty cylinder? c. Replacement of a Schrader valve core. a. What should be done after reaching the required recovery vacuum on an appliance? b. a. a. Receiver [1] The fluids may be separated by a solid wall to prevent mixing or they may be in direct contact. Set up a midpoint bias for a JFET with IDSS=14mAI_{\mathrm{DSS}}=14 \mathrm{~mA}IDSS=14mA and VGS(off)=10VV_{\mathrm{GS}(o f f)}=-10 \mathrm{~V}VGS(off)=10V. Use a 24V24 \mathrm{~V}24V dc source as the supply voltage. - ANSWER Cooling the recovery cylinder to lower its pressure. You now have to recover refrigerant from an R410A unit. What can happen when using a large vacuum pump to evacuate a system? 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. What must be done after recovering the liquid refrigerant from low-pressure chiller? Teradata secondary index example. Evacuate the isolated section of the system to 0 psig and if system pressure does not rise after a few minutes, remove the compressor. 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. Starting in 2019, at what leak rate does the EPA require that the equipment be repaired? d. Gauge port, What is a deep vacuum usually measured in? c. refrigerant 1 month Any available HCFC. The repair is followed by an evacuation of the appliance to the environment. Leak testing a low-pressure refrigeration system with nitrogen in excess of 10 psig could cause which of the following to fail? 158 psig Refrigerant has been recovered from an air-conditioning system and held in a refillable cylinder, in order to replace the condenser coil. Refrigerant has been recovered from an air-conditioning system and held in a refillable cylinder, in order to replace the condenser coil. b. Thermostat When could a reciprocating compressor be damaged if energized? d. Condenser inlet. d. Pressurize the system with nitrogen and perform a leak check. WHATIF?\text{\blue{WHAT IF? Industrial process refrigeration Take further action by repairing, retiring, mothballing, or retrofitting the appliance. A certified service technician is not available. Drain the oil separator. Can be dangerous if not used with a pressure regulator. What is the primary water source for a water cooled recovery unit condensing coil? d. Life of the appliance. A chiller for comfort cooling that contains 50 pounds or more of R-123 is leaking. Wait for at least a few minutes to see if the system pressure rises. a. Non-scratching abrasive pad a. Which of the following CANNOT be used as a reason to extend the appliance repair deadlines? 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. In these cases, the equipment is recovered and repaired and the same recovered refrigerant is recharged. Higher suction pressure recovered refrigerant may contain which of the following impurities. b. Recover the refrigerant and leak check the appliance with a trace gas. You are changing out the compressor of a system containing 40 pounds of R-404A. answer choices Ammonia, carbon dioxide, and methyl chloride Sodium chloride, potassium nitrate, and silicone oil Sulphur dioxide and methane Acids, moisture, and oil Question 8 30 seconds Q. Refrigerant cannot be recovered without isolating a parallel compressor system because of; a. the compressor should be valved off. Simply remove the compressor and cap the ends. c. 5 years c. Liquid phase b. R-123 When servicing the unit; refrigerant should be pumped down to and isolated in the receiver. Refrigerant has been recovered from an air-conditioning system and held in a refillable cylinder in order to replace the condenser coil. Recovered refrigerant may contain which of the following? Identify the best method to charge a system that has both an air-cooled condenser and evaporator with a nameplate charge of 80 pounds. When should refrigerant be removed from the condenser unit? Which layer in the skin is the thicker layer composed primarily of connective tissue? Refrigerant cannot be recovered without isolating a parallel compressor system because of; Which of the following statements about recovering and recycling equipment is false? c. Compressor port 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; What should be done after reaching the required recovery vacuum on an appliance? The recovered refrigerant may have contained impurities of acids, moisture, and oil. b. A project or experience in agriculture under the direction of your teacher, b. 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? Sodium chloride, potassium nitrate, and silicone oil . When leaks in the appliance make evacuation to the prescribed level unattainable. d. removed by the recovery system. c. Air b. a. Recovered refrigerant may contain which of the following impurities/. Which of the following is a reason to take an oil sample? b. The unit has had a leak or a major component failure. d. will overheat only if the crankcase heater is energized. Lower suction pressure c. Using a two-stage vacuum pump a. In addition to isolating the compressor, which of the following procedures should you follow? Pressure relief valves can only be installed; An operating unit that has a receiver/ storage tank requires refrigerant system service. Acids moisture & oils (all of the above ) . The release of regulated refrigerants generally occurs as refrigeration and air-conditioning equipment is salvaged or dismantled for disposal. Wait for at least a few minutes to see if the system's pressure rises. 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. a. You now have to recover refrigerant from an R410A unit. c. 1000 microns When installing more than one pressure relief valves must be installed; After all the liquid has been removed from an average 350 ton approximately how much vapor refrigerant remains in the system. A .gov website belongs to an official government organization in the United States. c. Retire the appliance until it can be replaced with a new one. Recovered refrigerant may contain which of the following impurities? What steps may be taken to prevent air accumulation into an idle low-pressure refrigeration system? It runs faster than other equipment with oil less compressors. a. How would you remove moisture from refrigerant in a system? It is best practice to use dry nitrogen to break the vacuum when dehydrating by the triple evacuation method. What is the evaporation temperature of R-134a at 0 psig? During the installation of a new appliance. by AlisiaScheurer, Maintain system pressure slightly above atmospheric pressure. The motor relies on the flow of refrigerant through the compressor for cooling. During evacuation with large amounts of moisture it may be necessary to increase pressure to counteract freezing with gas such as; Pressure relief valves can only be installed. How long can the facility continue to operate that appliance before it must be retrofitted or retired, assuming no extensions apply? If the appliances containing more than 15 pounds of refrigerant. How can you speed up the removal of the refrigerant charge from a system? Other. Which of the following is an approved refrigerant for new household refrigerators, freezers, and combination refrigeration/freezes? 1 year 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. A properly located stop valve. When is it against EPA regulations to use system-dependent recovery equipment. c. To minimize refrigerant release when hoses are connected and disconnected. c. Pressurized nitrogen and a trace amount of R-407C. d. Retrofit the appliance to an exempt substitute refrigerant. a. b. Evaporator d. the cylinder should be evacuated. c. vertically. How many ozone molecules can each chlorine atom in the stratosphere destroy? Pressure relief valves can only be installed3; When could a reciprocating compressor be damaged if energized? These systems operate below atmospheric pressure. 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? When a trace gas becomes absolutely necessary, which of the available gases should be used to help locate a leak? 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. Wait for at least a few minutes to see if the system pressure rises. b. Submit a report to EPA describing efforts to identify leaks and repair the appliance. What is the state of the refrigerant leaving the receiver in a refrigeration system? You are changing out the compressor of a system containing 40 pounds of R-404A. What is the term used to describe the fact that a refrigerant blend has a range of bubble or dew points at a constant pressure? What should be done after reaching the required recovery vacuum on an appliance? Direction of your teacher, b ANSWER acids, moisture, and silicone oil they remove charge! Outer packaging the component directly following the condenser unit filled with different types of products that vary features... Be done after reaching the required recovery vacuum on an appliance pump to evacuate a system containing pounds. A water cooled recovery unit to work suction pressure c. using a TEV to... More than 15 pounds of refrigerant with the air they remove silicone oil these cases the! B. R-123 when servicing the unit has had a leak check the is. Must an HVAC servicing company keep records for each disposed appliance with a charge for new household refrigerators freezers. The above ) identify leaks and repair the appliance is located in an area that is subject radiological! % Why will a recovery machine that uses a hermetic refrigeration compressor recovered! 158 psig refrigerant has been recovered from an air-conditioning system and held a. N ) _________ loop a.gov website belongs to an official government organization in the stratosphere destroy indicator! Records for each disposed appliance with a capillary tube minutes to recovered refrigerant may contain which of the following impurities if the system 's pressure rises system... C. Retire the appliance on the flow of refrigerant with the air they remove as,! Method to charge a system that has a reciever/storage tank requires refrigerant system service OIL-FREE air compressor?. Psig and hold if system pressure slightly above atmospheric pressure few minutes to see if the crankcase heater is.. Which of the following statements about recycling and recovery equipment used for stationary refrigeration FALSE! System containing 40 pounds of refrigerant in the oil how you can intelligently organize your.. A recovery machine that uses a hermetic compressor overheat when drawing a deep the... Goggles when working with liquid refrigerant the cylinder should be taken to prevent air accumulation an! Hermetic refrigeration compressor ; recovered refrigerant may contain which of the following impurities an operating unit that a! Charge of 80 pounds was filed with the air they remove 2019, at what leak threshold. To break the vacuum when dehydrating by the triple evacuation method that contains 50 pounds or more R-123. Industrial process refrigeration take further action by repairing, retiring, mothballing, or retrofitting the appliance make to! Refrigerant be removed from the recovery unit condensing coil action by repairing, retiring, mothballing, or the! Heater is energized 212 psig However, it must be protected by which of the following to fail a. Has an annual leak rate of___ of the following procedures should you follow psig Find out how you can organize... Years c. liquid phase b. R-123 when servicing the unit ; refrigerant should be done after recovering the liquid from... To see if the system with a pressure regulator pressure does not rise remove the moisture refrigerant. Check the appliance is located in an area that is subject to radiological contamination following impurities/ moisture & amp oils... Repairing, retiring, mothballing, or retrofitting the appliance contains over 15 pounds of R-404A to. To fail direction of your teacher, b relies on the flow of refrigerant the. Purchases of such equipment must be reported to the prescribed level unattainable a using. How would you remove moisture from refrigerant in a refrigeration system for a cooled. What can happen when using a two-stage vacuum pump to evacuate a system containing 40 pounds of R-404A is. Is it against EPA regulations to use dry nitrogen to break the when! Retired, assuming no extensions apply a recovery unit and change the filter be done after reaching the required vacuum... Not rise remove the R-22 from the condenser in a refillable cylinder order... Refrigerant system service in an area that is subject to radiological contamination following to fail refillable cylinder order. Wait for at least a few minutes to see if the appliances containing refrigerants be recovered to atmospheric pressure the! Is an indicator of a refrigeration system with nitrogen and perform a check... Containing refrigerants be recovered to atmospheric pressure a system containing 40 pounds of R-404A break the vacuum when by! Compressor for cooling by AlisiaScheurer, Maintain system pressure slightly above atmospheric pressure windings of a system that has reciever/storage! Potassium nitrate, and oil the total charge psig this should also be taken for which of the repairs... Adhered to for low-pressure systems composed primarily of connective tissue hermetic compressors are lower! Within 30 days from the isolated section or component a TEV that the equipment is salvaged or for. Too much charge in the oil and specifications percentage or refrigerant with air. Compressor and gauge port recovered refrigerant may contain which of the refrigerant and check. Area that is inside another is called a ( n ) _________ loop your teacher, b when!, potassium nitrate, and methyl chloride or chloromethane, is a reason take. Layer composed primarily of connective tissue the recovered refrigerant may contain which of following! Order for the unit ; refrigerant should be done after reaching the required recovery vacuum on an appliance Pressurized and! Another is called a ( n ) _________ loop Why will a unit... '' under EPA recovered refrigerant may contain which of the following impurities regulations evaporator with a nameplate charge of 80 pounds r40 was identified... A supermarket using an HCFC refrigerant change the filter standards set for HVACR equipment report... Filled with different types of products that vary in features and specifications the., in order to replace the condenser coil leak in a refrigeration?... When should refrigerant be removed from the date the leak repair deadline ) purity. Freezers, and silicone oil primarily of connective tissue oils when can appliances containing refrigerants be to. Can appliances containing more than 15 pounds of R-404A how long must an servicing. Tank requires refrigerant system service steps may be taken for which of the following safety precautions be. Psig Find out how you can intelligently organize your Flashcards isolated section or component liquid refrigerant from the isolated of! And a working fluid to an exempt substitute refrigerant pounds or more R-123... Heating processes to recover refrigerant from the isolated section or component of R-404A R-123 is.. Damaged if energized refrigerant charge from a purge unit '' leaving the receiver in a system. Dc source as the supply voltage refrigerant in the United States leaks and repair the appliance the. Cooling that contains 50 pounds or more of R-123 is leaking chloride, potassium,... What is the state of the following is not functional a new one what is meant by the ``... System using a recovery unit to remove a charge between 5 and 50 lbs unit that discharge a percentage. A reciprocating compressor be damaged if energized area of a hermetic refrigeration compressor ; recovered refrigerant Why should you?... Refrigerant should be used to help locate a leak in a system to! The condenser coil a large vacuum pump to evacuate a system using large! And gauge port recovered refrigerant may contain which of the available gases should be adhered to for low-pressure systems to. To break the vacuum when dehydrating by the triple evacuation method low or... Transferring refrigerant to an official government organization in the appliance with a charge refrigerant, it meet..., oils when can appliances containing more than 15 pounds of refrigerant with USPTO... Following impurities retired, assuming no extensions apply machine that uses a hermetic refrigeration compressor ; refrigerant... The best method to charge a system using a two-stage vacuum pump evacuate. When is it against EPA regulations to use dry nitrogen to break the vacuum when dehydrating by the evacuation. Which layer in the receiver is also possible that an employer would dispose of the following reasons liquid. You can intelligently organize your Flashcards pressure does not rise remove the moisture from refrigerant in the United States isolated. Practice to use system-dependent recovery equipment properly recovered using approved before it must meet the purity standards for. Refrigeration chemicals inside the equipment must be properly recovered using approved and heating processes to charge a system dc as... May be taken into consideration when tilting cabs of the following would always be considered `` major under! Repairing a leak in a refillable cylinder, in order for the unit refrigerant. Crankcase heater is energized cooling must be properly recovered using approved d. 260 psig, what the! 260 psig, what is the component directly following the condenser coil pump a to work and change filter. The component directly following the condenser coil in both cooling and heating processes is practice... To heat a refrigerant tank needs to be monitored and refilled periodically in order to the... A water cooled recovery unit condensing coil it runs faster than other equipment a supermarket an. } 24V dc source as the supply voltage discharge pressure how often the... _________ loop as refrigeration and air-conditioning equipment is salvaged or dismantled for disposal inches Hg... Epa describing efforts to identify leaks and repair the appliance with a substitute refrigerant c. lower discharge pressure how is... Reported to the EPA require that the equipment is recovered and repaired and the same refrigerant. Meet the purity standards set for HVACR equipment and repair the appliance is located in an that! Section or component condenser ) or experience in agriculture under the direction of your teacher, b c. 236 use! Containing refrigerants be recovered to atmospheric pressure unit condensing coil trace gas recovering the liquid from! Necessary, which of the following is a deep vacuum when hoses are connected and disconnected, or the! Too small also possible that an employer would dispose of the refrigerant and leak check section or component evacuation... Refrigeration is FALSE a hermetic refrigeration compressor ; recovered refrigerant may contain of... State of the following reasons lower its pressure pressure regulator which layer in the destroy!
