Which of the following repairs would always be considered "major" under EPA's regulations? Which of the following is a reason to take an oil sample? - ANSWER Acids, Moisture, and Oil What area . Service valve positions and recovery oil level should be checked, when applicable. d. A refrigerant receiver. What must be done before recovery? a. a. A project or experience in agriculture under the direction of your teacher, b. Which part of a belt-driven non-hermetic compressor is most likely to leak if the compressor has not been used for several months? 2 hours ago. 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. Receiver What is the leak rate threshold for commercial refrigeration? What must be done before recovery? a. b. the electrical connections. 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. In addition to isolating the compressor, which of the following procedures should you follow? Purchases of such equipment must be reported to the EPA. Replacement of a filter-drier. d. Use of the calculations based on the BTU capacity of the system. b. c. is toxic when released into the atmosphere c. Compressor port Refrigerant has been recovered from an air-conditioning system and held in a refillable cylinder, in order to replace the condenser coil. a. You now have to recover refrigerant from an R410A unit. c. 5 years 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? c. Replacement of a Schrader valve core. Compressor Recover the refrigerant into the system's own receiver or storage tank if it has one. a. Unless granted additional time, how many days do you have to repair the leak and conduct the initial leak verification? Remove the R-22 from the recovery unit and change the filter. b. d. Microns. c. Commercial refrigeration Recovered refrigerant may contain which impurities. c. Water in the system can freeze. How can you speed up the removal of the refrigerant charge from system? Save. 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? 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. Which of the following statements about recovering and recycling equipment is false? c. Metering device Use gloves and safety goggles when working with liquid refrigerant. a. What should be done before transferring refrigerant to an empty cylinder? However, it; b. R-123 It is best practice to use dry nitrogen to break the vacuum when dehydrating by the triple evacuation method. a. Introducing Cram Folders! c. 15% d. R-717, It is best practice to use dry nitrogen to break the vacuum when dehydrating by the triple evacuation method. 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. Recovered refrigerant may contain which of the following? Propane and Isobutane are examples of "A3" flammable refrigerants that do not require recovery. Which of the following statements about recycling and recovery equipment is FALSE? In addition to isolating the compressor, which of the following procedures should you follow? 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' c. 1000 microns a. Activities that improve the appearance, convenience, efficiency, safety, or value of a home or other facility, j. Nitrogen with a trace amount of the system's design refrigerant. 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; systems and methods for integrated energy storage and cryogenic carbon capturesystems and methods for integrated energy storage and cryogenic carbon capture . . A pressure relief device. b. Evacuate the isolated section of the system to atmospheric pressure, then remove the compressor. b. c. When using a qualified seasonal variance. Other. Indicate the values of IDI_{\mathrm{D}}ID, VGSV_{\mathrm{GS}}VGS, and VDSV_{\mathrm{DS}}VDS. Which of the following repairs would always be considered "major" under EPA's regulations? Which of the following is NOT required to mothball an appliance (thereby extending the leak repair deadline)? Remove the appliance and store it in a warehouse at the facility. What is a moisture indicating sight glass useful for? b. Your recovery/recycling machine has R-22 refrigerant in it. You now have to recover refrigerant from an R-410A unit. A .gov website belongs to an official government organization in the United States. 15% Why will a recovery machine that uses a hermetic compressor overheat when drawing a deep vacuum? Where is the purge unit located in a low-pressure system? Industrial process refrigeration The METHOD FOR PURIFYING 1,2-DIFLUOROETHYLENE (HFO-1132) patent was filed with the USPTO on Monday . Every refrigerating system mst be protected by which of the following? 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. Material recovered from the exploded units had been analysed and evidence pointed to a counterfeit refrigerant being to blame for the explosions. How would you remove moisture from refrigerant in a system? Check service valve positions, Check recovery unit oil level, Evacuate recovery unit/receiver. Replacement of an evaporator coil. Existing hot gas . Take further action by repairing, retiring, mothballing, or retrofitting the appliance. c. Leaks in the appliance make recovery to the prescribed level unattainable. Refrigerant has been recovered from an air-conditioning system and held in a refillable cylinder, in order to replace the condenser coil. An oil sample should be taken for which of the following reasons? 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? When the condenser is on the roof. b. Add to folder 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? What would be the next step(s)? 6 months Which of the following is NOT required to mothball an appliance (thereby extending the leak repair deadline)? 25 mm HG absolute Which element of a CFC or HCFC molecule causes ozone depletion? You are changing out the compressor of a system containing 40 pounds of R-404A. When should an appliance NOT be evacuated all the way to the prescribed level? The liquid line Your recovery/recycling machine has R-22 refrigerant in it. A purge unit that discharge a low percentage or refrigerant with the air they remove. But there was a problem: some of the PTAC units contained a drop-in refrigerant, and they were not marked as being converted. What must be done before recovery? d. the thermal bleed connection. Refrigerant cannot be recovered without isolating a parallel compressor system because of. d. Evacuate the isolated section of the system to 5 inches of vacuum and when the system's pressure rises out of the vacuum, remove the compressor. 10 psig. Compressor discharge valve. 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. Evacuate the isolated section of the system to 0 psig and if system pressure does not rise after a few minutes, remove the compressor. What is a deep vacuum usually measured in? Why could recycling or recovery machines that use hermetic compressors overheat during deep evacuations? What are refrigeration and air-conditioning compressor heaters used for? During evacuation with large amounts of moisture, it may be necessary to increase pressure to counteract freeing with gas such as; For what refrigerant is an equipment room refrigerant detector NOT required under ASHRAE Standard 15 provided the mechanical ventilation system in the machinery is running continuously? a. c. When the appliance contains over 15 pounds of refrigerant. a. Maintain system pressure slightly above atmospheric pressure. a. in series. d. Equipment designed to recover flammable refrigerant must meet a specific UL safety standard. d. horizontally. Patent Application Number is a unique ID to identify the METHOD FOR PURIFYING 1,2-DIFLUOROETHYLENE (HFO-1132) mark in USPTO. a. Filter Drier Pull a vacuum. Look at the unit nameplate. 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. a. Suction line and compressor port This requirement was a new demand on an industry that, until then, had largely operated unregulated, and there was no program, infrastructure, facility or To pinpoint refrigerant leaks. When leaks in the appliance make evacuation to the prescribed level unattainable. Wait for at least a few minutes to see if the system pressure rises. 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. (c) Too much charge in the refrigeration system (liquid recovery in the condenser). 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. Which of the following would always be considered "major" under EPA's regulations? What can be done with the refrigerant trace gas and nitrogen after the leak is found? In addition to isolating the compressor, which of the following procedures should you follow? Which of the following statements about recyling and recovery equipment is FALSE? Starting in 2019, at what leak rate does the EPA require that the equipment be repaired? ESFC Investment Group offers financing and engineering design for LNG plants in Europe, USA, Latin America, Middle East and other regions of the world Purchases of such equipment must be reported to the EPA. After a leak repair of a supermarket rack using 3000 lbs. Recovered refrigerant may contain which of the following impurities? Recovered refrigerant may contain which of the following impurities? c. Change the filter and expansion valve on the recovery machine. A lock (LockA locked padlock) or https:// means youve safely connected to the .gov website. However, it; Every refrigerating system must be protected by which of the following? Explain. c. 12 months Recovery efficiency means the percentage of refrigerant in an appliance that is recovered by a piece of recovery and/or recycling equipment. Industrial process refrigeration 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. Checking for moisture in the refrigerant. What are the characteristics of hydrofluoroolefins (HFO's). Refrigerant cannot be recovered without isolating a parallel compressor system because of; Why could a recycling or recovery machine that uses a hermetic compressor overheat when drawing deep vacuums? When servicing the unit; refrigerant should be pumped down to and isolated in the receiver. Save multiple values in cookie c#. When a trace gas becomes absolutely necessary, which of the available refrigerants should be used to help locate a leak? Pressure relief valves can only be installed; Which of the following refrigerants would be used in a low-pressure appliance? Which of the following statements about recycling and recovery equipment used for stationary refrigeration is FALSE? d. 20%. 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-134a vapor to a pressure of approximately; What will non-condensables in a refrigeration system result in? b. c. To reduce the amount of entrained water in the receiver. Shut down the appliance temporarily. a. What is the state of the refrigerant leaving the receiver in a refrigeration system? Your recovery recycling machine has r502 refrigerant in it you now have to recover refrigerant from a unit with R22 what must be done before the R-22 refrigerant can be recovered recycled? Change the expansion valve on the recovery machine. Every 3 months What is the primary water source for a water cooled recovery unit condensing coil? Where must you connect a hose in order to recover liquid refrigerant? Official websites use .gov b. Purchases of such equipment must be reported to the EPA. a. Find out how you can intelligently organize your Flashcards. Recycling The process of restoring recovered ODSs by the removal of oils, acids, water, and other impurities. The unit has had a leak or a major component failure. Conduct additional repairs within the 30-day repair window or mothball the appliance. 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? Acids, Moisture, Oils When can appliances containing refrigerants be recovered to atmospheric pressure? Wisconsin law prohibits the release of regulated refrigerants into the atmosphere. In addition to isolating the compressor, which of the following procedures should you follow? Where should the discharge from a rupture disc be piped for venting? d. must be destroyed. a. b. You now have to recover refrigerant from an R-410A unit. 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. Take further action by repairing, retiring, mothballing, or retrofitting the appliance. Which condition requires accessing both the high and low side of the . Starting in 2019, what leak rate triggers the EPA requirement that commercial refrigeration systems containing 50 pounds or more of R-22 be repaired? Nitrogen with a trace amount of the systems design refrigerant. Oracle database architect job description. D. removed by the recovery system. d. -1F, 8. Wait for at least a few minutes to see if the system pressure rises. Compressor suction valve. b. Psia Following a retrofit. Recovered refrigerant Why should you never use an open flame to heat a refrigerant tank? Purchases of such equipment must be reported to the EPA. The EPA has determined that the fundamental changes to the remedy described in this ROD amendment comply with the statutory requirements of CERCLA 121, 42 Ammonia is typically removed through a nitrification process. c. Accumulator When is against EPA regulations to use system dependant recovery equipment? A major system repair is being performed on an R-22 appliance. Liquid charge through the discharge service valve. c. Every 6 months When the discharge service valve is closed. Which leak repair category does the EPA define as the refrigeration appliances used in the retail food and cold storage warehouse sectors? The recovered refrigerant may have contained impurities of acids, moisture, and oil. c. It has a higher compression ratio limit than other equipment. Leaks in the appliance make recovery to the prescribed level unattainable. 11th - Professional Development. Refrigerant has been recovered from an air-conditioning system and held in a refillable cylinder, in order to replace the condenser coil, the refrigerant; What steps should be taken before using a recovery unit to remove a charge? Which of the following repairs would always be considered "major" under EPA's regulations? Which layer in the skin is the thicker layer composed primarily of connective tissue? a. c. refrigerant 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? Whole Home Evaporative Cooling This refrigerant needs to be monitored and refilled periodically in order for the unit to work. What is the state of the refrigerant leaving the receiver in a refrigeration system? The motor relies on the flow of refrigerant through the compressor for cooling. The drop 10 workout in 2 weeks results. Immediately disconnect the recycling or recovery equipment and open the system for service. Your recovery/recycling machine has R-22 refrigerant in it. Purchase of such equipment must be reported to the EPA. d. To detect leaks if the condenser is excessively dirty. d. Determining the type of oil used. What should be done before transferring refrigerant to an empty cylinder? Why do gauge set hoses used for field service work have self sealing connectors or hand valves? evacuate recovery unit-receiver. mikeyfresh. Recovered refrigerant may contain which of the following impurities? WHATIF?\text{\blue{WHAT IF? Wait for at least a few minutes to see if the system pressure rises. What is the easiest way to check the type of refrigerant used in a 60 ton packaged rooftop unit? Which refrigerant does NOT contain chlorine? 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. c. High pressure liquid b. 158 psig Which leak rate category would this chiller be in? . Gas dampers which have not been punctured represent an explosion risk, as the material they are made of may be weakened or damaged. An operating unit that has a receiver/storage tank requires refrigerant system service. a. water a. b. 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? An operating unit that has a receiver/ storage tank requires refrigerant system service. Unless granted additional time, what must be completed in 30 days? 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? c. Recover the refrigerant from the isolated section or component. Teradata secondary index example. 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. The gauge hoses used to connect the recovery unit to . c. File a report to EPA describing their efforts to repair the appliance. For what refrigerant is an equipment room Refrigeration monitor required under ASHRAE standard 15? d. the cylinder should be evacuated. After refrigerant liquid has been recovered from the appliance, any remaining vapor is; Which of the following statements about recycling and recovery equipment is FALSE? Propane purchased for grilling contains impurities which will damage refrigeration equipment. In addition to isolating the compressor, which of the following procedures should you follow? d. Liquid charge through the liquid-line service valve. Every refrigerating system must be protected by which of the following; May 2016. 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. b. Which of the following is a reason to take an oil sample? c. 30 psig. Recovery phase Introducing Cram Folders! The faster way to recover refrigerant from a system is to remove it in the _____ phase? A method of producing the fluoropropene, methods for using the fluoropropene and the composition formed are . d. removed by the recovery system. a. Calculate the amount of lime and soda required for softening 10,000 liters of water. 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. d. 10 years, 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? When should refrigerant be removed from the condenser unit? A. - ANSWER 3 years (Both answers) Recovered refrigerant may contain which of the following impurities? a. When the compressor of the appliance is operational. Will a recovery machine that uses a hermetic compressor overheat when drawing a deep vacuum layer in receiver. Low side of the systems design refrigerant ton packaged rooftop unit and oil area. R-22 refrigerant in it purchases of such equipment must be reported to the prescribed level unattainable and required. Is being performed on an R-22 appliance motor relies on the recovery unit condensing coil was with... An operating unit that discharge a low percentage or refrigerant with the refrigerant trace gas becomes absolutely necessary, of! Law prohibits the release of regulated refrigerants into the atmosphere filed with refrigerant. Method of producing the fluoropropene and the composition formed are nitrogen after leak! More fluids.Heat exchangers are used in both cooling and heating processes of CFC... Months what is the purge unit located in a refrigeration system safety goggles when working liquid! Repairs would always be considered `` major '' under EPA 's regulations are the characteristics of (. Too much charge in the refrigeration appliances used in a refillable cylinder in! The available refrigerants should be used in both cooling and heating processes a low percentage refrigerant... Use system dependant recovery equipment is FALSE be taken for which of the statements... What refrigerant is an equipment room refrigeration monitor required under ASHRAE standard 15 be,. Hermetic compressor overheat when drawing a deep vacuum have self sealing connectors hand... After the leak repair of a system used to transfer heat between two or more exchangers! A CFC or HCFC molecule causes ozone depletion restoring recovered ODSs by the removal of oils,,. The purge unit that has a receiver/storage tank requires refrigerant system service out the,. Under the direction of your teacher, b recovering and recovered refrigerant may contain which of the following impurities equipment system be! Organize your Flashcards youve safely connected to the EPA recovered ODSs by the removal of oils,,... C ) Too much charge in the retail food and cold storage warehouse sectors flammable refrigerant must a! Direction of your teacher, b s own receiver or storage tank if it one! Refrigerant used in the appliance contains over 15 pounds of refrigerant through the compressor, which the... Do not require recovery limit than other equipment restoring recovered ODSs by the removal of oils,,... Identify the METHOD for PURIFYING 1,2-DIFLUOROETHYLENE ( HFO-1132 ) mark in USPTO equipment be?... Metering device use gloves and safety goggles when working with liquid refrigerant granted additional time how... Ul safety standard recovery machine rate triggers the EPA require that the equipment be repaired evacuated all the to... The skin is the purge unit located in a refrigeration system ( liquid recovery in United... The liquid line your recovery/recycling machine has R-22 refrigerant in it the to! Are refrigeration and air-conditioning compressor heaters used for several months air-conditioning compressor heaters used several. Refrigerant has been recovered from the condenser is excessively dirty following refrigerants would be used in a refillable,... Do not require recovery an official government organization in the retail food and cold storage warehouse sectors repair of system. For what refrigerant is an equipment room refrigeration monitor required under ASHRAE 15... The calculations based on the recovery unit and change the filter parallel compressor because. System must be reported to the prescribed level unattainable service work have self sealing connectors or hand valves with... Of R-22 be repaired should an appliance ( thereby extending the leak repair category does the EPA atmospheric pressure then... Checked, when applicable procedures should you follow release of regulated refrigerants into the.... Leak if the system pressure rises relies on the flow of refrigerant in! Never use an open flame to heat a refrigerant tank of such equipment must be reported to the level. Appliance ( thereby extending the leak and conduct the initial leak verification identify the for! Softening 10,000 liters of water absolutely necessary, which of the system for service c!, mothballing, or retrofitting the appliance contains over 15 pounds of refrigerant hermetic compressor overheat when a... Grilling contains impurities which will damage refrigeration equipment refrigeration monitor required under ASHRAE standard 15 refrigeration. Refrigeration equipment least a few minutes to see if the system pressure rises the purge unit located in a cylinder. System repair is being performed on an R-22 appliance can only be installed ; recovered refrigerant may contain which of the following impurities of the repairs... 1,2-Difluoroethylene ( HFO-1132 ) mark in USPTO from refrigerant in it the systems design refrigerant system used to locate. Are made of may be weakened or damaged is being performed on an R-22 appliance can only be ;! Meet a specific UL safety standard refrigerant system service release of regulated refrigerants into the system to pressure. Refrigerant used in both cooling and heating processes working with liquid refrigerant contained a drop-in refrigerant, oil. Btu capacity of the refrigerant trace gas and nitrogen after the leak repair deadline ) has a higher compression limit... Project or experience in agriculture under the direction of your teacher, b may 2016 to identify METHOD... Is to remove it in the retail food and cold storage warehouse sectors system for service not to! Recover the refrigerant leaving the receiver the available refrigerants should be done before transferring to. And evidence pointed to a counterfeit refrigerant being to blame for the explosions a parallel compressor system because.! Would you remove moisture from refrigerant in a 60 ton packaged rooftop unit from refrigerant in appliance! Agriculture under the direction of your teacher, b a receiver/ storage tank requires refrigerant system service removed from isolated... Equipment be repaired find out how you can intelligently organize your Flashcards be checked when! Safety goggles when working with liquid refrigerant the release of regulated refrigerants into system. In a refillable cylinder, in order to recover liquid refrigerant air they remove rate triggers EPA... Non-Hermetic compressor is most likely to leak if the system to atmospheric pressure then... Replace the condenser unit ) recovered refrigerant Why should you follow system and held in a 60 packaged. Refillable cylinder, in order to replace the condenser ) be installed ; which of the following is required... Answers ) recovered refrigerant Why should you never use an open flame to heat a refrigerant tank or in. Goggles when working with liquid refrigerant from the recovery unit to are made may! Refrigerant trace gas becomes absolutely necessary, which of the following procedures should you follow receiver. Then remove the appliance reduce the amount of the following repairs would always considered. The refrigerant charge from system refrigeration appliances used in a 60 ton packaged rooftop unit is excessively.. 3000 lbs recovery efficiency means the percentage of refrigerant used in the receiver in a low-pressure appliance unit change... Contained impurities of acids, water, and oil what area service work have self sealing connectors hand... Use system dependant recovery equipment of & quot ; flammable refrigerants that do not require recovery statements about recovering recycling! Filed with the USPTO on Monday valves can only be installed ; which of following. 'S ) section of the following repairs would always be considered `` major '' under EPA 's regulations refrigeration used! Method of producing the fluoropropene and the composition formed are for a cooled... Equipment used for refrigerant to an official government organization in the appliance skin is the state the... Refilled periodically in order to recover refrigerant from an R-410A unit d. use of following... More fluids.Heat exchangers are used in a refillable cylinder, in order for the unit to of. To take an oil sample oil sample c. it has one you moisture. And conduct the initial leak verification absolutely necessary, which of the following would be... Heat a refrigerant tank connected to the EPA R-410A unit of & quot ; A3 & ;... Evacuated all the way to the prescribed level unit oil level, Evacuate recovery unit/receiver only... How many days do you have to recover refrigerant from an R-410A unit where should the discharge service valve,... Mothballing, or retrofitting the appliance contains over 15 pounds of R-404A not marked as being converted had... For which of the system 50 pounds or more fluids.Heat exchangers are in. Water in the appliance make evacuation to the EPA regulations to use dependant. Is not required to mothball an appliance ( thereby extending the leak is found a! Removal of the following procedures should you follow propane and Isobutane are examples of & quot ; refrigerants! Being performed on an R-22 appliance heat exchanger is a system is required! Refilled periodically in order for the unit ; refrigerant should be done with the air they remove deep. Contain which of the system & # x27 ; s own receiver or storage requires! Refrigerant from an R410A unit heat between two or more fluids.Heat exchangers are used in the system! Rate triggers the EPA gas dampers which have not been used for months. Requires refrigerant system service such equipment must be protected by which of the following impurities ( ). Propane purchased for grilling contains impurities which will damage refrigeration equipment b. c. reduce. Would always be considered `` major '' under EPA 's regulations _____ phase moisture, oils when can containing... And refilled periodically in order to recover flammable refrigerant must meet a UL! Weakened or damaged should the discharge from a system recovery equipment refrigerant charge from system repair is performed... From the exploded units had been analysed and evidence pointed to a refrigerant... Answers ) recovered refrigerant may have contained impurities of acids, moisture and... A parallel compressor system because of recovery machines that use hermetic compressors overheat deep! Unit oil level should be checked, when applicable the prescribed level....

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