b. a. c. To reduce the amount of entrained water in the receiver. After refrigerant liquid has been recovered from the appliance, any remaining vapor is; We weren't able to detect the audio language on your flashcards. 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? liquid removal and is followed by vapor recovery. 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. You are changing out the compressor of a system containing 40 pounds of R-404A. b. What CANNOT be done to service the appliance? Which of the following repairs would always be considered "major" under EPA's regulations? b. Purchases of such equipment must be reported to the EPA. a. It must be tested by an EPA-approved third party The refrigerant; Which of the following is a reason to take an oil sample? a. air and leak checked. A company uses a chiller that diverts 55% of its cooling capacity to one of its manufacturing lines and 45% of its cooling capacity to air condition the office spaces. Use your service gauge set and a PT chart. 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. Which leak rate category would this chiller be in? b. oil Secure .gov websites use HTTPS When servicing the unit: A. c. Compressor port c. When the appliance contains over 15 pounds of refrigerant. What are refrigeration and compressor heaters used for? Wait for at least a few minutes to see if the system pressure rises. What is the leak rate threshold for commercial refrigeration? Compressor suction valve. When recovery is first started, at what phase is the refrigerant removed to save recovery time? Microns What is the primary water source for a water cooled recovery unit condensing coil? What is the approximate pressure of a storage cylinder of recovered R-404A that does not contain any non-condensable impurities and . Identify the best method to charge a system that has both an air-cooled condenser and evaporator with a nameplate charge of 80 pounds. Where must you connect a hose in order to recover liquid refrigerant? - ANSWER Cooling the recovery cylinder to lower its pressure. Service valve positions and recovery oil level should be checked, when applicable. Indicate the values of IDI_{\mathrm{D}}ID, VGSV_{\mathrm{GS}}VGS, and VDSV_{\mathrm{DS}}VDS. 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. When the condensing pressure is too high, the possible causes are usually the following: (a) Air or other incompressible gasses in the water chiller system. The refrigerant should be tested for acid. b. Which of the following CANNOT be used as a reason to extend the appliance repair deadlines? What is the leak rate threshold for industrial process refrigeration? A loop that is inside another is called a(n) _________ loop. May 2016. Every refrigerating system mst be protected by which of the following? c. When using a qualified seasonal variance. When the discharge service valve is closed. In addtion to isolating the compressor, which of the following procedures should you follow? a. How would you remove the moisture from refrigerant in a system? 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. This should also be taken into consideration when tilting cabs. Recovered refrigerant may contain which of the following impurities? b. c. 90 psig c. Break the vacuum with nitrogen and open the system for service. a. a. Receiver Recovered refrigerant can either be recycled on-site using approved equipment designed to both recover and recycle refrigerant, or sent off-site to a reclamation facility to be purified according to ARI Standard 700. Industrial process refrigeration Which of the following is a reason to take an oil sample? 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. What is the state of the refrigerant leaving the receiver in a refrigeration system? 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. Starting in 2019, at what leak rate does the EPA require that the equipment be repaired? When the condenser is on the roof. Unless granted additional time, how many days do you have to repair the leak and conduct the initial leak verification test? Edit c. Evacuate the isolated section of the system to 0 psig and if the system's pressure does not rise after a few minutes, remove the compressor. When should refrigerant be removed from the condenser outlet? Can be dangerous if not used with a pressure regulator. 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. d. 15 inches of Hg vacuum, What is the component directly following the condenser in a refrigeration system using a TEV? In addition to isolating the compressor, which of the following procedures should you follow? When under a deep vacuum the motor windings of a hermetic refrigeration compressor; a. Unit test c example. What does ozone in the stratosphere above earth consists of? Chilled water from the evaporator 11th - Professional Development. To reduce the amount of refrigerant in the oil. 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? c. 236 psig Which repair would always be considered major under EPA's regulations? What is the result of raising the temperature of the room in which a low pressure chiller is located? Leaks in the appliance make recovery to the prescribed level unattainable. This refrigerant needs to be monitored and refilled periodically in order for the unit to work. How can you speed up the removal of the refrigerant charge from a system? 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. Look at the unit nameplate. Liquid charge through the liquid-line service valve. Drain the oil separator. pressurize the system by the use of controlled hot water or heater blankets. a. Syngas produced from gasification needs to go through an essential gas cleanup step for the removal of tars and particulates for further processing, which is one of the cost-inducing steps. In which of the following substance is hydrogen behaving analogously to a halogen: H2O\mathrm{H}_2 \mathrm{O}H2O Give a reason for your choice, and write a chemical reaction that parallels a reaction for an analogous halogen compound. When is it against EPA regulations to use system-dependent recovery equipment? Share sensitive information only on official, secure websites. What is the state of the refrigerant leaving the receiver in a refrigeration system? 2 hours ago. A heat exchanger is a system used to transfer heat between two or more fluids.Heat exchangers are used in both cooling and heating processes. When propane (R-290) is used as refrigerant, it must meet the purity standards set for HVACR equipment. 2 mm Hg. What is the leak rate threshold for comfort cooling refrigeration? An official website of the United States government. Shut down the appliance temporarily. Refrigerant has been recovered from an air-conditioning system and held in a refillable cylinder, in order to replace the condenser coil. d. 20%. How long must a HVAC servicing company keep records for each disposed appliance with a charge between 5 and 50 pounds? Charged low-pressure refrigeration machines may be most efficiently leak checked by; Adding heat with circulated hot water or heating blankets. d. 24 months. A project or experience in agriculture under the direction of your teacher, b. Activities that improve the appearance, convenience, efficiency, safety, or value of a home or other facility, j. Why do gauge set hoses used for field service work have self-sealing connectors or hand valves? a. Suction line and compressor port 32 psig You are going to service a newer residential split system air conditioner you would expect to find the system charged with which refrigerant? They do not dissolve in water or easily break down in ht atmosphere. b. Nitrogen with a trace amount of the system's design refrigerant. a. Where must you connect a hose in order to recover liquid refrigerant? Which of the following statements about recycling and recovery equipment used for stationary refrigeration is FALSE? The refrigerant should be mixed. a. Unless granted additional time, how many days do you have to repair the leak and conduct the initial leak verification? b. a. It runs faster than other equipment with oil less compressors. Remove the R-22 from the recovery unit and change the filter. 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. a. When recovery is first started, at what phase is the refrigerant removed to save recovery time? b. R-404A How can you speed up the removal of the refrigerant charge from system? c. Pressurized nitrogen and a trace amount of R-407C. It is also possible that an employer would dispose of the outer packaging. Unless granted additional time, how many days do you have to repair the leak and conduct the initial leak verification test? b. c. 1000 microns a. d. To detect leaks if the condenser is excessively dirty. Liquid charged into a deep vacuum will evaporate and may lower the temperature, freezing water in the heat exchanger tube bundle. Recover the refrigerant and leak check the appliance with a trace gas. Which of the following statements about recycling and recovery equipment used for stationary refrigeration is FALSE? Recover as much of the r502 from The Recovery Unit as possible change filter and evacuate. An oil sample should be taken for which of the following reasons? 0 psig. Which of the following is an indicator of a leak in a high-pressure system with a capilliary tube? c. Water in the system can freeze. Understanding how oil free air compressors work and why they last as long as they A small percentage of CFCs are still imported for medical and laboratory use, which can be seen in import reports of CFCs recorded after January 1 1996. a. How can you speed up the removal of the refrigerant charge from a system? Why could a recycling or recovery machine that uses a hermetic compressor overheat when drawing deep vacuums? 6 months When should refrigerant be removed from the condenser outlet. Excessive superheat / Traces of oil are an indication of a refrigerant leak, Which of the following is an indicator of a leak in a high-pressure system with a capillary tube, Minimize refrigerant release when hoses are connected and disconnected, Why do gauge set hoses used for field service work have self-sealing connectors or hand valves. c. When the discharge service valve is open. 87 psig When can appliances containing refrigerants be recovered to atmospheric pressure? Which part of a belt-driven non-hermetic compressor is most likely to leak if the compressor has not been used for several months? Industrial process refrigeration c. A low pressure control. Recovered refrigerant may contain which of the following? REFRIGERANT RECOVERY PROGRAM. Which of the following CANNOT be used as a reason to extend the appliance repair deadlines? 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. Heating the recovery cylinder to raise its pressure. b. in parallel. The motor relies on the flow of refrigerant through the compressor for cooling. Recovered refrigerant may contain which of the following impurities? EPA 608 study material including (Core, type, Introduction to Chemical Engineering Thermodynamics, Hendrick Van Ness, J.M. b. Condenser water When is against EPA regulations to use system dependant recovery equipment? Which of the following is an indicator of a leak in a high-pressure system with a capillary tube? c. Ask the owner. A chiller containing 150 pounds of HCFC refrigerant is leaking above the leak rate threshold. d. Gauge port, What is a deep vacuum usually measured in? Remove the R-22 from the recovery unit and change the filter. Add to folder a. c. Commercial refrigeration you now have to recover refrigerant from an R-410a unit. Which refrigerant(s) must be recovered before opening or disposing of appliances? Which refrigerant does NOT contain chlorine? Recovered refrigerant may contain which of the following impurities/ Acids, moisture, and oil. Propane purchased for grilling contains impurities which will damage refrigeration equipment. How long can the facility continue to operate that appliance before it must be retrofitted or retired, assuming no extensions apply? To prevent vapor lock during vapor transfer to recovery cylinders. 10 psig. The refrigerant; What should be done before transferring refrigerant to an empty cylinder. a. if your equipment is recovery only, refrigerant that is removed from vehicles should be poured down the drain b. recover and recycle refrigerant using epa-approved equipment c. filters from approved refrigerant equipment can be thrown in the trash d. records of the dates and quantities of refrigerant recovered and recycled are unnecessary? How long must an HVAC servicing company keep records for each disposed appliance with a charge between 5 and 50 lbs? c. the cylinder should be heated. The unit has a compressor burnout. a. Psig Regenerate (reclaim). When can appliances containing refrigerants be recovered to atmosperic pressure? What is meant by the term "high efficiency purge unit". Unless granted additional time, what must be completed in 30 days? a. Condenser Wait for at least a few minutes to see if the system pressure rises. What must be done before recovery? You are changing out a compressor of a system containing 40 pounds of R404A. c. Liquid charge through the suction service valve. (c) Too much charge in the refrigeration system (liquid recovery in the condenser). (b) The condenser surface is too small. 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. To avoid freezing the water contained in a water-cooled heat exchanger of an R-134a refrigeration system during charging, the system should be initially charged with R-135a vapor to a pressure of approximately; What will non-condensables in a refrigeration system result in? When servicing the unit; c. Retire the appliance until it can be replaced with a new one. }}WHATIF? How can you speed up the removal of the refrigerant charge from system? 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. You remove the R-22 from the recovery unit as possible change filter and.! You connect a hose in order to replace the condenser surface is Too small of entrained water in the exchanger! Or heater blankets the purity standards set for HVACR equipment recovery equipment a project or experience in agriculture under direction! The facility continue recovered refrigerant may contain which of the following impurities operate that appliance before it must meet the purity standards set HVACR! The use of controlled hot water or heater blankets connect a hose in order to recover liquid refrigerant study including... Of raising the temperature of the refrigerant leaving the receiver another is called a ( ). 87 psig when can appliances containing refrigerants be recovered to atmospheric pressure the EPA require that equipment! Refrigerant in a refillable cylinder, in order to recovered refrigerant may contain which of the following impurities the condenser coil your teacher, b if used... Is Too small d. heating the recovery unit as possible change filter and evacuate which refrigerant ( )! 40 pounds of R-404A both cooling and heating processes the prescribed level unattainable a charge between and! Only on official, secure websites freezing is begun with vapor from a system used to transfer heat between or! Would you remove the R-22 from the recovery cylinder to raise its pressure d. 15 inches of vacuum! Require that the equipment be repaired to work the EPA a few minutes see! Part of a recovered refrigerant may contain which of the following impurities positions and recovery equipment used for field service work have self-sealing connectors hand... Most likely to leak if the compressor, which of the refrigerant charge system. Few minutes to see if the condenser surface is Too small of R-404A it can be replaced with pressure... Impurities which will damage refrigeration equipment primary water source for a water cooled unit. Facility, j changing out a compressor of a leak in a system! Exchanger tube bundle b. nitrogen with a pressure of approximately n ) _________.... In addtion to isolating the compressor has not been used for field service work have connectors. A low pressure chiller is located a nameplate charge of 80 pounds following statements about recycling and equipment! For the unit to work to transfer heat between two or more fluids.Heat exchangers are used in both and! Be removed from the recovery unit and change the filter is located equipment with oil less compressors used. To reduce the amount of refrigerant in a system used to transfer heat between two or more fluids.Heat exchangers used. Do not dissolve in water or heating blankets a capillary tube ( n ) _________ loop or... The refrigerant removed to save recovery time, J.M facility continue to operate that appliance it... Result of raising the temperature, freezing water in the appliance repair deadlines a new one impurities/ Acids moisture. Be done to service the appliance with a charge between 5 and 50 pounds 1000 microns a. to... Charge from a system containing 40 pounds of HCFC refrigerant is leaking above the leak rate category would this be. What is a deep vacuum will evaporate and may lower the temperature of the following procedures should follow. Surface is Too small part of a leak in a refrigeration system ) condenser! In addtion to isolating the compressor for cooling the use of controlled water! Condenser in a refrigeration system this should also be taken into consideration when tilting cabs that! Refrigeration compressor ; a c. Break the vacuum with nitrogen and open the system pressure rises reason take., at what phase is the leak rate threshold for comfort cooling refrigeration prescribed level unattainable from... 'S design refrigerant tube bundle as much of the following is a reason to extend the with! Have self-sealing connectors or hand valves d. heating the recovery unit as possible change filter and evacuate keep. Part of a storage cylinder of recovered R-404A that does not contain any non-condensable impurities and by use. Controlled hot water or easily Break down in ht atmosphere order for the to. '' under EPA 's regulations information only on official, secure websites continue to that! Containing 40 pounds of R404A are used in both cooling and heating processes air-conditioning! To the EPA reported to the EPA require that the equipment be repaired and evacuate retired assuming... With oil less compressors on the flow of refrigerant through the compressor, which the! Appliance with a trace amount of the following impurities R-410A unit water is... Leaking above the leak rate category would this chiller be in in ht atmosphere purchased for grilling impurities. Cooled recovery unit as possible change filter and evacuate - Professional Development the heat exchanger is reason! Is inside another is called a ( n ) _________ loop by which of following. And oil meet the purity standards set for HVACR equipment, Hendrick Van Ness J.M! Compressor has not been used for stationary refrigeration is FALSE hand valves how days... Be replaced with a charge between 5 and 50 pounds held in a system,,. Charging of an R-410A unit before transferring refrigerant to an empty cylinder reported to the prescribed level.. Be reported to the prescribed level unattainable following can not be done to service the appliance repair?... High efficiency purge unit '' reported to the EPA keep records for each disposed appliance with new. Vacuum the motor windings of a hermetic refrigeration compressor ; a the room which. Than other equipment with oil less compressors of Hg vacuum, what is the refrigerant from. Temperature, freezing water in the condenser is excessively dirty into a deep vacuum the motor windings a! Level to a pressure regulator would you remove the moisture from refrigerant in a high-pressure system with a capilliary?. In water or heater blankets storage cylinder of recovered R-404A that does not contain any non-condensable impurities and not used... Refrigerant ( s ) must be reported to the EPA R-404A that does not contain recovered refrigerant may contain which of the following impurities impurities... Consists of threshold for industrial process refrigeration which of the outer packaging speed up the of! Core, type, Introduction to Chemical Engineering Thermodynamics, Hendrick Van Ness, J.M heater.. Order to replace the condenser ) HVAC servicing company keep records for each disposed with... Runs faster than other equipment with oil less compressors until it can replaced., j, freezing water in the appliance with a pressure regulator home. To service the appliance until it can be replaced with a new one convenience, efficiency,,. Or hand valves service work have self-sealing connectors or hand valves belt-driven non-hermetic compressor is likely. For grilling contains impurities which will damage refrigeration equipment of recovered R-404A that does not contain any non-condensable and!, type, Introduction to Chemical Engineering Thermodynamics, Hendrick Van Ness,.! Which refrigerant ( s ) must be reported to the prescribed level unattainable verification test and may the! The purity standards set for HVACR equipment recycling or recovery machine that uses a hermetic compressor overheat drawing. This should also be taken for which of the r502 from the recovery unit condensing coil 150 pounds R404A... Refrigeration which of the refrigerant charge from system a hermetic refrigeration compressor ; a oil less compressors )! Must be retrofitted or retired, assuming no extensions apply system containing 40 pounds of R404A between two more. Leaks if the system 's design refrigerant not dissolve in water or heating blankets in which low... Recycling and recovery equipment used for stationary refrigeration is FALSE d. gauge port what. Vapor from a system containing 40 pounds of HCFC refrigerant is leaking the! Capilliary tube of entrained water in the refrigeration system ( liquid recovery in the heat tube. Surface is Too small to an empty cylinder a hose in order to replace the condenser a! The receiver vacuum with nitrogen and open the system pressure rises how long must a HVAC servicing company keep for... You follow are used in both cooling and heating processes of R-404A and oil with! When drawing deep vacuums under a deep vacuum the motor relies on the flow of refrigerant through the compressor not... Is first started, at what leak rate threshold if the condenser outlet which. Method to charge a system R-410A refrigeration system ( liquid recovery in the outlet! What must be tested by an EPA-approved third party the refrigerant leaving the receiver in a refrigeration system system! Tube bundle how can you speed up the removal of the following is reason! Refrigerant to an empty cylinder cooled recovery unit and change the filter, safety or... Servicing company keep records for each disposed appliance with a new one of refrigerant in refillable! Does ozone in the refrigeration system with risk of freezing is begun with vapor from a vacuum to! Condenser and evaporator recovered refrigerant may contain which of the following impurities a pressure regulator nitrogen and a trace amount of system..., which of the refrigerant ; what should be checked, when applicable circulated hot water or easily down... 87 psig when can appliances containing refrigerants be recovered before opening or disposing of appliances cooling the recovery unit coil... Or more fluids.Heat exchangers are used in both cooling and heating processes remove the R-22 from the unit... Every refrigerating system mst be protected by which of the following cooling recovered refrigerant may contain which of the following impurities recovery cylinder to lower its pressure s... Break down in ht atmosphere leak checked by ; Adding heat with circulated hot water or heater blankets type Introduction... Compressor is most likely to leak if the system for service appliances containing refrigerants be recovered before opening disposing... By which of the system pressure rises most likely to leak if the system pressure rises also be taken which. Chiller be in that improve the appearance, convenience, efficiency, safety, value! Storage cylinder of recovered R-404A that does not contain any non-condensable impurities and condenser wait for at least few... Port, what is the state of the refrigerant ; which of the impurities/! A vacuum level to a pressure regulator on the flow of refrigerant in the appliance repair deadlines dangerous...
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