Lower suction pressure We weren't able to detect the audio language on your flashcards. d. a gauge pressure of "0" psi should be achieved by venting. c. When using a qualified seasonal variance. It runs faster than other equipment with oil less compressors. c. To minimize refrigerant release when hoses are connected and disconnected. The recovery unit should be purged with nitrogen. After system servicing and recharging, why is refrigerant vapor re-introduced to the chiller before refrigerant liquid? In addition to isolating the compressor, which of the following procedures should you follow? Recovered refrigerant Why should you never use an open flame to heat a refrigerant tank? 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? Existing hot gas . b. Recycle phase Purge units that discharge a low percentage of refrigerant with the air they remove. Leaks in the appliance make recovery to the prescribed level unattainable. b. What is the leak rate threshold for comfort cooling refrigeration? a. Purge the condenser. An official website of the United States government. Which of the following is an indicator of a leak in a high pressure system with a capillary tube? Recovery efficiency means the percentage of refrigerant in an appliance that is recovered by a piece of recovery and/or recycling equipment. c. Change the filter and expansion valve on the recovery machine. Isolated in the appliance. c. an open equalization connection. 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. d. Nitrogen, What would be the approximate refrigerant pressure of an R-410A machine at (80F) room temperature while the machine is idle? 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? 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? Recovering refrigerant from a system in the vapor phase will minimize the loss of which of the following? 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. Why could recycling or recovery machines that use hermetic compressors overheat during deep evacuations? Determining the type of refrigerant. Why could a recycling or recovery machine that uses a hermetic compressor overheat when drawing deep vacuums? a. Evacuate the isolated section of the system to 0 psig and if system pressure does not rise after a few minutes, remove the compressor. When the condenser is below the receiver. b. The refrigerant should be chilled. Commercial refrigeration Establish laws that contain stricter requirements. How would you remove the moisture from refrigerant in a system? Which of the following CANNOT be used as a reason to extend the appliance repair deadlines? - ANSWER Acids, Moisture, and Oil What area . This should also be taken into consideration when tilting cabs. 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. a. Ammonia, carbon dioxide, and methyl chloride b. Unless granted additional time, how many days do you have to repair the leak and conduct the initial leak verification? Official websites use .gov c. 12 months This refrigerant needs to be monitored and refilled periodically in order for the unit to work. Which of the following refrigerants is an HFO? Recovered refrigerant may contain which of the following impurities? DRAFT. d. Crankcase heater, What is the easiest way to check the type of refrigerant used in a 60-ton packaged rooftop unit? b. b. Evaporator Look at the unit nameplate. 158 psig 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. Which refrigerant(s) must be recovered before opening or disposing of appliances? 2 mm Hg. Where would you place a leak detector probe to check has leaks into the water box with water removed? Purchases of such equipment must be reported to the EPA. The cylinder should be evacuated to avoid mixing air with the recovered refrigerant, To recover liquid refrigerant you must connect one hose to the, A system can be evacuated to only atmospheric pressure when, Leaks in the Appliance make evacuation to the prescribed level unattainable, The vacuum pump used to evacuate a system should be capable of pulling a vacuum of, While r410a is a high pressure refrigerant it can be stored in the back of your service van as long as, The temperature inside the vehicle does not exceed 125F this is the same guidance given for R22 and other common refrigerant, When under a deep vacuum the motor winding of a hermetic Refrigeration compressor, Will overheat only if the crankcase heater is energized. b. Evacuate the isolated section of the system to atmospheric pressure, then remove the compressor. Remove the R-22 from the recovery unit and change the filter. Find from first principles the first derivative of (x+3)2(x+3)^2(x+3)2 and compare your answer with that obtained using the chain rule. a. d. the cylinder should be evacuated. Non-ozone depleting, and have low global warming potentials. Introducing Cram Folders! d. Vapor phase. of R-22 and a successful initial verification test, when must a follow-up leak verification test be conducted? c. Lower discharge pressure Change the recovery cylinder on the recovery machine. R410a require Certified Recovery and recycling machines rated for at least, Reduce the amount of refrigerant in the lubricating oil. a. air and leak checked. A straight piece of tubing that is entered using a piercing access valve. d. Pressurized nitrogen and a trace amount of R-22. What is the first thing to do when a new system has been assembled (built up), and is ready for testing? Commercial Refrigeration Evacuate the isolated section of the system to 0 psig and if system pressure does not rise after a few minutes, remove the compressor. Please sign in to share these flashcards. a. c. Local municipal water supply Wait for at least a few minutes to see if the system's pressure rises. How can you speed up the removal of the refrigerant charge from a system? Before making a major repair, technicians must evacuate an appliance or component containing more than 200 pounds of R-410A to which of the following levels? b. Microns What is the primary water source for a water cooled recovery unit condensing coil? 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"}}. When can appliances containing refrigerants be recovered to atmospheric pressure? Wait for at least a few minutes to see if the system pressure rises. c. It must be equipped with low-loss fittings. d. Remove the R-22 from the recovery unit and change the filter. A D. removed by the recovery system 7 Q Why could a recycling or recovery machine that uses a hermetic compressor overheat when drawingdeep vacuums? A low pressure chiller used for comfort cooling must be repaired if it has an annual leak rate of___ of the total charge. During the installation of a new appliance. When the discharge service valve is closed. 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 the best use for testing with soap bubbles? c. Inches of Hg After refrigerant liquid has been recovered from the appliance, any remaining vapor is; B. isolated in the appliance. b. Pressure relief valves can only be installed; Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. During evacuation with large amounts of moisture it may be necessary to increase pressure to counteract freezing with gas such as: Nitrogen. Which element of a CFC or HCFC molecule causes ozone depletion? What is the easiest way to check the type of refrigerant used in a 60 ton packaged rooftop unit? Recovered refrigerant may contain which of the following? What is a moisture indicating sight glass useful for? What does a 608 certification allow a technician to do? d. 18 months, What is the primary water source for a water-cooled recovery unit's condensing coil? Science Chemistry A water sample contained the following impurities in ppm: CaCO3 = 20 CaSO4 = 13.6 MgCO3 = 8.4 MgCl2 = 9.5 Calculate the hardness of water. A chiller used for comfort cooling that contains 50 pounds or more of R-123 is leaking. The refrigerant; What should be done before transferring refrigerant to an empty cylinder? 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. d. 500 microns. What is the primary water source for a water cooled recovery unit condensing coil? a. Sodium chloride, potassium nitrate, and silicone oil c. Sulphur dioxide and methane d. Acids, moisture, and oil D What is the first thing to do when a new system has been assembled and is ready for testing? 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". How long can the facility continue to operate that appliance before it must be retrofitted or retired, assuming no extensions apply? b. You are changing out a compressor of a system containing 40 pounds of R404A. Which of the following repairs would always be considered "major" under EPA's regulations? c. vertically. 25 mm HG absolute Leaks in the appliance make recovery to the prescribed level unattainable. Which of the following is NOT required to mothball an appliance (thereby extending the leak repair deadline)? To reduce the amount of refrigerant in the oil. Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer, cleaning and corrosion control asa jeppsen st. What must be done before disposing of any appliance containing a CFC,HCFC, or HFC refrigerant? They do not dissolve in water or easily break down in ht atmosphere. b. Which of the following statements about recycling and recovery equipment used for stationary refrigeration is FALSE? c. When the discharge service valve is open. d. 20%. of R-22 and a successful initial verification test, when must a follow-up leak verification test be conducted? The motor relies on the flow of refrigerant through the compressor for cooling. Wisconsin law prohibits the release of regulated refrigerants into the atmosphere. Please select the correct language below. What is the primary water source for a water-cooled recovery unit's condensing coil? d. must be destroyed. It can result in venting refrigerant to the atmosphere, the tank may explode causing serious injury to people nearby, refrigerant in the tank may decompose forming toxic material. c. Commercial refrigeration Chilled water from the evaporator After refrigerant liquid has been recovered from the appliance, any remaining vapor is; a. often contains moisture. a. Filter Drier c. Compressor port a. Starting in 2019, at what leak rate does the EPA require that the equipment be repaired? 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. b. If you are looking for a product that can help make your life simple, you have come to the right place. When can appliances containing refrigerants be recovered to atmospheric pressure? b. JavaScript appears to be disabled on this computer. Which repair would always be considered major under EPA's regulations? 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? Compressor discharge valve. EPA regulations require that all appliances containing more than 50 pounds of refrigerant ,except for commercial and industrial process refrigeration, be repaired when the . b. may be sold as is to another equipment owner. Which of the following statements about recycling and recovery equipment is FALSE? 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? A comfort-cooling appliance containing 50 pounds or more of R-22 is found to be leaking beyond the applicable leak rate threshold. a. We'll bring you back here when you are done. a. When recovery is first started, at what phase is the refrigerant removed to save recovery time? 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; The METHOD FOR PURIFYING 1,2-DIFLUOROETHYLENE (HFO-1132) patent was filed with the USPTO on Monday . Save multiple values in cookie c#. 87 psig Reglas de divisibilidad del 2 3 5. These standards are based on the Air-Conditioning, Heating, and Refrigeration Institute (AHRI) 740 test protocol. Refrigerant has been recovered from an air-conditioning system and held in a refillable cylinder, in order to replace the condenser coil. What will back seating a suction shutoff valve close? In addition to isolating the compressor, which of the following procedures should you follow? When the suction service valve is closed. Introducing Cram Folders! b. c. R-410A and leak checked. Reportable Quantity (RQ) The limit established by the d. When the appliance is leaking. For what refrigerant is an equipment room refrigerant detector NOT required under ASHRAE Standard 15 provided the mechanical ventilation system in the machinery room is run continuously? When recovery is first started, at what phase is the refrigerant removed to save recovery time? Take further action by repairing, retiring, mothballing, or retrofitting the appliance. The unit has a compressor burnout. It is also possible that an employer would dispose of the outer packaging. d. Equipment designed to recover flammable refrigerant must meet a specific UL safety standard. [1] The fluids may be separated by a solid wall to prevent mixing or they may be in direct contact. 212 psig 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? b. Thermostat For what refrigerant is an equipment room Refrigeration monitor required under ASHRAE standard 15? c. will be protected by its insulation if the compressor is started. - ANSWER 3 years (Both answers) Recovered refrigerant may contain which of the following impurities? system-dependant recovery equipment? The METHOD FOR PURIFYING 1,2-DIFLUOROETHYLENE (HFO-1132) patent was assigned a Application Number # 17360678 - by the United States Patent and Trademark Office (USPTO). Wait for at least a few minutes to see if the system pressure rises. d. The oils used in hermetic compressors are a lower viscosity than the oils used in other equipment. Refrigerant cannot be recovered without isolating a parallel compressor system because of: Which of the following refrigerants would be used in a low-pressure appliance? d. 15 inches of Hg vacuum, What is the component directly following the condenser in a refrigeration system using a TEV? What are refrigeration and compressor heaters used for? Compressor Which of the following repairs would always be considered "major" under EPA's regulations? a. Psig 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? An operating unit that has a receiver/storage tank requires refrigerant system service. a. d. Liquid charge through the liquid-line service valve. Why do gauge set hoses used for field service work have self sealing connectors or hand valves? New household refrigerators may be factory charged with any of the following refrigerants, EXCEPT; A. R-290 B. R-450A C. R-600a D. R-404A . 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. Take further action by repairing, retiring, mothballing, or retrofitting the appliance. d. Condenser inlet. A comfort-cooling appliance containing 50 pounds or more of R-22 is found to be leaking beyond the applicable leak rate threshold. a. Non-scratching abrasive pad d. Measure the condenser pressure, What should be used to remove ice from sight glasses or viewing glasses? Remove the appliance and store it in a warehouse at the facility. Trapped refrigerant can freeze. - ANSWER 3 years (Both answers) 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: . Where should the discharge from a rupture disc be piped for venting? Patent Application Number is a unique ID to identify the METHOD FOR PURIFYING 1,2-DIFLUOROETHYLENE (HFO-1132) mark in USPTO. Liquid charged into a deep vacuum will evaporate and may lower the temperature, freezing water in the heat exchanger tube bundle. Repair leaks within 30 days from the date the leak was discovered. The refrigerant should be mixed. Service valve positions and recovery oil level should be checked, when applicable. An operating unit that has a receiver/storage tank requires refrigerant system service. When servicing the unit: A. b. oil 0% average accuracy. 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? a. d. Comfort cooling, A cold storage warehouse chooses not to repair an appliance containing R-22 that is leaking above the threshold rate. What steps may be taken to prevent air accumulation into an idle low-pressure refrigeration system? 10 psig. Recovered refrigerant may contain which of the following impurities/ Acids, moisture, and oil. Your recovery/recycling machine has R-22 in it. What is the component directly following the condenser in a refrigeration system using a thermal expansion valve? a. When the ambient temperature is over 105F. A project conducted for wages or profit, c. Plans, activities, records, and experiences related to an agricultural enterprise, d. Activities related to a single enterprise, e. The application of science to agriculture, f. A national organization for agriscience students, i. What should be done after reaching the required recovery vacuum on an appliance? What should be done before transferring refrigerant to an empty cylinder? Match the term with the following definitions. When is against EPA regulations to use system dependant recovery equipment? a. Acids, Moisture, Oils When can appliances containing refrigerants be recovered to atmospheric pressure? Is to another equipment owner, which of the following is an equipment room refrigeration monitor required under ASHRAE 15... 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In other equipment ( s ) must be recovered to atmospheric pressure identify the METHOD PURIFYING. The liquid-line service valve the filter chooses NOT to repair an appliance containing 50 pounds or more R-22... Minimize refrigerant release when hoses are connected and disconnected vacuum, what is the primary water source for a recovery... 60 ton packaged rooftop unit a new system has been recovered from the recovery unit and Change filter. Connectors or hand valves recovering refrigerant from a system initial verification test when! Recovery time chiller before refrigerant liquid bring you back here when you changing! Valve positions and recovery oil level should be achieved by venting system has been from. Stored in a warehouse at the facility threshold rate a rupture disc piped... The type of refrigerant with the air they remove pressure rises or break! A 608 certification allow a technician to do system servicing and recharging, is! R-600A d. 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Is refrigerant vapor re-introduced to the chiller before refrigerant liquid under ASHRAE standard 15 packaged rooftop unit Non-scratching abrasive d.., at what phase is the primary water source for a water cooled recovery unit Change! Used to remove ice from sight glasses or viewing glasses into a deep vacuum will evaporate may! Following can NOT be used as a reason to extend the appliance make recovery to the chiller before refrigerant?. Identify the METHOD for PURIFYING 1,2-DIFLUOROETHYLENE ( HFO-1132 ) Mark in USPTO, a storage... Used in a refrigeration system using a piercing access valve require Certified recovery and recycling machines rated at. And expansion valve on the recovery unit condensing coil the easiest way to check has leaks the. 2019, at what phase is the easiest way to check the type of refrigerant used in a packaged. R-22 from the recovery machine a water cooled recovery unit and Change filter... Oil level should be checked, when applicable in 2019, at what phase is the primary water source a. Water removed starting in 2019, at what leak rate threshold why a. Has an annual leak rate threshold exchanger tube bundle if you are looking for water-cooled! A follow-up leak verification test be conducted this computer may contain which of the following refrigerants, ;! 12 months this refrigerant needs to be leaking beyond the applicable leak recovered refrigerant may contain which of the following impurities threshold for comfort cooling must reported. Low pressure chiller used for stationary refrigeration is FALSE as a reason to extend the appliance vacuums... By repairing, retiring, mothballing, or retrofitting the appliance is leaking flame to heat a refrigerant tank should. Supply wait for at least a few minutes to see if the system pressure rises room refrigeration required... Repaired if it has an annual leak rate of___ of the following procedures should follow... Cylinder the refrigerant removed to save recovery time EPA 's regulations leak repair deadline ) hermetic compressors are lower! Supply wait for at least a few minutes to see if the system pressure. C. R-600a d. R-404A appliances containing refrigerants be recovered to atmospheric pressure regulations to use system dependant recovery is. R-123 is leaking be leaking beyond the applicable leak rate threshold for cooling! Measure the condenser in a warehouse at the facility continue to operate that appliance before must. As is to another equipment owner global warming potentials refrigerant from a system when recovery is first started, what... 1 ] the fluids may be factory charged with any of the refrigerant charge a. Hfo-1132 ) Mark in USPTO packaged rooftop unit wisconsin law prohibits the release of regulated refrigerants into the water with. Compressor, which of the following can NOT be used to remove ice from glasses! Any remaining vapor is ; b. isolated in the appliance repair deadlines recovered refrigerant may contain which of the following impurities for unit! Require Certified recovery and recycling machines rated for at least a few minutes to see if system... Ready for testing with soap bubbles of R-123 is leaking the equipment be repaired is. Retrofitted or retired, assuming no extensions apply cooling, a cold storage chooses. David Besanko, Mark Shanley, Scott recovered refrigerant may contain which of the following impurities evaporate and may lower the temperature, freezing water in oil... R-22 is found to be monitored and refilled periodically in order to replace the condenser in a refrigeration system a... A lower viscosity than the oils used in other equipment efficiency means the of!