EPA 608 Universal Certificate Actual Exam| Complete Solutions |Verified Questions & Answers |100 out of 100| Latest 2026–2027 Edition

EPA 608 Universal Certificate Actual Exam| Complete Solutions |Verified Questions & Answers |100 out of 100| Latest 2026–2027 Edition Q: (TF)CFCs readily decompose in the lower atmosphere and consume enormous quantities of the OZONE in the process. Answer True Q: (TF)As part of the EPA's Clean Air Act as well as its subsequent amendments, the sale of regulated refrigerants to certified technicians is restricted. Answer True Q: (TF)HCFC Refrigerants decompose much faster than CFC Refrigerants. Answer True Q: (TF)Under Section 608 of the Clean Air Act, only two types of refrigerant releases are permitted. Answer False Q: (TF)As of January 1, 1996, CFC refrigerants and any refrigerant that contained a CFC, such as R-502, can no longer be legally manufactured in or imported into the US. Answer True Q: (TF)Carbon Dioxide depletes ozone and does not act as a greenhouse gas. Answer False Q: (TF)CFC and HCHC refrigerants are less likely to reach the stratosphere than other chrorine-containing compounds because they dissolve in water and readily break down in the atmosphere. Answer False Q: (TF)Since the liquid-recovery process is significantly faster than vapor recovery, liquid recovery will reduce the amount of time required to complete the recovery process. Answer True Q: (TF)In most instances, it is recommended that a sample of the contaminated refrigerant be analyzed at an appropriate testing facility to determine the extent of the impurities in the refrigerant. Answer True Q: (TF)Cylinders of compressed gases shall be transported in a vertical position, unless loaded into suitably secured racks, or otherwise secured in an upright position. Answer False Q: (TF)Many refrigerants have low boiling points and can cause instant frostbite if liquid touches the skin. Answer True Q: (TF)Record-keeping for systems that contain refrigerant charges between 5 pounds and 50 pounds must be maintained for a minimum of ten years. Answer False Q: (TF)When soldering and brazing, always use Oxygen for pressurization. Answer False Q: (TF) As per EPA regulations, refrigerant cannot change ownership. Answer True Q: (TF)When refrigerant is being recovered from a disabled air-conditioning or refrigeration system, it is a violation of federal guidelines to leave the recovery process unattended. Answer True Q: (TF)Checking continuity must be done when a circuit is energized. Answer False Q: (TF)For proper vacuum level measurement, a vacuum gauge should be located as close to the vacuum pump as possible. Answer False Q: (TF)The UV solution that is added to a system for a ultraviolet leak detection should circulate for at least 24 hours before attempting to locate system leaks. Answer True Q: (TF)When using a system-dependent (passive) recovery system on an appliance with an operating compressor, run the compressor and recover the refrigerant from the low side of the system. Answer False Q: (TF)Whenever dry nitrogen from a portable cylinder is used in a service procedure, always install a relief valve in the downstream line at the inlet of the condenser. Answer True Q: (TF)When Thermostatic expansion valves (TXV) is used in a refrigeration system, the receiver should always be installed in the liquid line at the inlet of the condenser. Answer False Q: (TF)Non-condensables, if not removed from a system, will cause lower discharge pressures. Answer False Q: (TF)Generally, it is appropriate to evacuate high-pressure systems with large leaks to atmospheric pressure. Answer True Q: (TF)The ASHRAE Guideline 3-1990 states that if the pressure in a system rises from 1 mm HG to a level above 2.5 mm HG during a standing vacuum test, the system should be checked for leaks. Answer True. Q: is classified as a hydrochlorofluorocarbon (HCFC) refrigerant, as it contains hydrogen, chlorine, fluorine, and carbon. Answer R-22 Q: A service technician can earn different certifications. Answer Four Q: Common refrigerants are R-22 and R-123. Answer HCFC A molecule is made up of two carbon atoms surrounded by six hydrogen atoms. Answer Methane It is a violation of the Clean Air Act to change refrigerant oil at higher than psig. Answer 5 have the highest ODPs and are the most harmful to the OZONE layer. Answer CFCs Carbon dioxide is the baseline substance that contributes to global warming and has a GWP of . Answer 1 The definition of is to reprocess refrigerant to a new product specifications, as outlined by AHRI-700 standards. Answer Reclaim To minimize the problems associated with future refrigerant contamination, it is recommended that appropriate be connected upstream of recovery units and recovery cylinders prior to filling. Answer Filter-Driers A cylinder must not be filled if the present date is more than years past the date stamped on the shoulder or collar of the cylinder. Answer Five Refrigerants classified as substances are considered the safest. Answer A1 The maximum allowable leak late for industrial process refrigeration is %. Answer 30 Bleeding dry through a system during the brazing process prevents oxidation and helps to ensure a clean, tight system. Answer Nitrogen. The timeframe for the mothballing process is extended to months if a system will be repaired or retrofitted with the exempt refrigerant. Answer 18 Recovery equipment intended for use with small appliances must be able to recover % of the appliance's refrigerant when the appliance's compressor is operating. Answer 90 During vapor refrigerant recovery, the refrigerant entering the recovery unit is compressed, condensed, and then discharged into the recovery tank, via the . Vapor Port. gauges connect directly to a system, enabling the technician to measure and observe a system's pressures (or vacuum) without having to use a gauge manifold. Stub A allows precise measurement of refrigerant charge, with accurate adjustment for varying temperature conditions. Charging Cylinder is used to purge refrigerant lines during the brazing process. Nitrogen is considered a replacement for R-12 in household refrigerators, only after proper retrofit procedures have been followed. R-134 If a new appliance is charged with a flammable refrigerant, the aperture or process tubes on the appliance must be color-coded . Red Technicians working with must provide a special set of hoses, gauges, a vacuum pump, a recovery or recovery/recycling machine, and oil containers to be used with that refrigerant only. R-134a System- dependent recovery equipment cannot be used when an appliance contains more than pounds of refrigerant. 15 When leak testing a low-pressure, centrifugal system with nitrogen, do not exceed psig. 10 Before charging with liquid, a refrigeration system with R-11 requires a vapor pressure of " HG vacuum in the shells. 16.9 (TF)Technicians, as well as the companies they work for, who violate the laws as set forth in EPA's Section 608 regulations are subject to a number of disciplinary actions, including loss of certification, fines amounting to as much as $44,539 per day per violation, and court appearances. True (TF)A service technician must become Type III certified to be Type I and Type II certified. False (TF)The EPA is a terminal certification. True (TF)The EPA is in charge of creating and enforcing regulations regarding ozone depletion, the ultimate phase-out of CFC and HCFC refrigerants, and other environmental issues directly related to the Montreal Protocol. True (TF)As of November 14, 1974, all individuals who preform installation, service, maintenance, or repair functions on air-conditioning and refrigeration equipment must be certified. False The EPA Section 608 Technician Certification examination is a -question, closed-book exam examination comprised of four sections. 100 To pass a given section of the certification exam, the candidate must obtain a minimum score of % in that section. 72% In 1876, Karl Paul Gottfried built the first practical using liquid ammonia as the coolant. Refrigerator. As of 2019, nations operate under Article 5 of the Montreal Protocol to resolve the global problem of stratospheric ozone depletion. 196. In 1930, were developed. Chlorofluorocarbons Refrigerant is a nontoxic, nonflammable, noncorrosive refrigerant with a boiling point (at atmospheric pressure) of about -20 degrees F. R-12 The Type certification is for servicing small, factory-sealed appliances that contain a refrigerant charge of 5 lb or less. 1 Section 608 of the Clean Air Act provides certification exceptions for apprentices who are registered with the Department of Labor Both R-11 and R-12 are refrigerants classified as CFCs as they are comprised solely of chlorine, fluorine, and . Carbon The , which was signed by representatives from 24 nations in 1987, documents the process of resolving the global problem of stratospheric ozone depletion. Montreal Protocol Type certification is for servicing or disposing of medium-, high-, or very high pressure systems that include residential and commercial air-conditioning and refrigeration systems as well as some industrial process refrigeration equipment. 2 John Gorrie developed the first successful mechanical refrigeration system in the US and is credited with being the inventor of . Mechanical Cooling As part of the as well as its subsequent amendments, the EPA has set in place certification requirement for recycling, reclaiming, and recovery equipment as well as the service technicians who operate these pieces of equipment. Clean Air Act (TF)Per Section 608 of the Clean Air Act, recovery and recycling equipment manufactured after November 15, 2003, must be equipped with low-loss fittings. False (TF)The EPA allows individual purchasers, large purchasers, or contractors to authorize other non-certified employees to purchase or accept delivery of refrigerants. True (TF)Hydrofluorocarbons contain chlorine. False (TF)HFO refrigerants are as flammable as HC refrigerants. False (TF)After a refrigerant has been phased out, existing supplies can still be used in addition to refrigerant that has been recovered and reclaimed. True (TF)In an R-125 molecule, one carbon atom is surrounded by two hydrogen atoms and five fluorine atoms. False (TF)HCFC refrigerants decompose much faster than CFC refrigerants. True (TF)The DuPont numbering system is used with azeotropes and near-azeotropic blends. False (TF)Different refrigerant oil types should not be mixed. True (TF)The Clean Air Act Amendments of 1990 state that it is illegal for technicians to vent OZONE-depleting substances into the atmosphere. True (TF)Under Section 608 of the Clean Air Act, only two types of refrigerant releases are permitted. False (TF)Naturally occurring hydrofluoroolefins include methane, ethane, propane, and butane. False (TF)Refrigerant blends are mixtures created by combining four or more single-compound refrigerants in various combinations. False Only technicians certified under Clean Air Act Section 609 (MVAC - Motor Vehicle Air Conditioning) can purchase refrigerants in cylinders and tanks that are designed to hold less than lbs. 20 are comprised solely of hydrogen and carbons. Hydrocarbons An molecule is made up of two carbon atoms surrounded by six hydrogen atoms. Ethane The , which is Section 612 of the EPA's Clean Air Act, reviews and evaluates the human health and environmental risks associated with substitute refrigerants and other industry-used chemical substances. Significant New Alternatives Policy program is scheduled for total phase-out in 2020. R-22 When using the DuPont numbering system, the leftmost digit of a refrigerant number represents one less than the number of atoms in the molecule. Hydrogen A is any group of five chemically related, nonmetallic elements that include fluorine, chlorine, bromide, iodine, and astatine. Halogen The term " " refers to the refrigerant state where both vapor and liquid refrigerant are present in a closed vessel. Saturated quantities of refrigerant are permitted to be released in the course of making good-faith attempts to recapture and recycle or safely dispose of refrigerant. Diminimus are composed of various combinations of chlorine, fluorine, and carbon. CFCs do not contain chlorine and therefore do not destroy OZONE. HFOs Refrigerants are classified not only by the elements that make up the refrigerant but also by the liquid saturation pressure of the refrigerant as measured at degrees F. 104 , the most viable HCFC replacement for R-11, will be phased out from new-equipment use after 2020, with total phase-out in 2030. R-123 When using the DuPont refrigerant numbering system, the rightmost digit represents the number of atoms in the molecule. Fluorine are hydrocarbons that have either some or all of their hydrogen atoms replaced with a halogen. Halocarbons To prevent from occurring, near-azeotropic refrigerant blends should only be removed from a cylinder as a liquid. Fractionization Polyalkylene glycols, also known as PAGs, are incompatible with . Chlorine Common refrigerants are R-11, R-12, R-113, R-114, and R-115. CFCs blends are refrigerant blends that do not behave as a single-compound refrigerants and follow a pressure/temperature relationship where there are multiple temperatures for each pressure at which the saturated refrigerant is present. Near-Azeotropic A quick way to work with the DuPont numbering system is to simply add to the refrigerant number. 1 When a nitrogen/refrigerant mixture is used for leak detection, no more than a of refrigerant can be used. Trace (TF)Ozone creation and decay are natural, dynamic processes. True (TF)The binds between chlorine and oxygen atoms in a chlorine monoxide molecule are stronger than the bonds between two oxygen atoms in an oxygen atoms in an oxygen molecule. False (TF)As the CO2 level in the atmosphere decreases, the amount of heat emitted by the Earth decreases. False (TF)Routine system maintenance can help reduce the consumption of electrical energy which contributes to global warming. True (TF)In the upper atmosphere, OZONE is a protective barrier that acts to deflect and defuse the sun's intense and harmful ultraviolet radiation. True (TF)The chemicals most often blamed for the destruction of the OZONE shield are CFCs. HCFCs, and halons. True OZONE is a molecule made up of oxygen atoms. Three atoms have the ability to break up OZONE molecules in a process similar to natural OZONE depletion. Chlorine The amount of heat transferred from the Earth's surface to the atmosphere is affected by the content in the atmosphere. Carbon Dioxide Natural occurs when ultraviolet rays from the sun break an oxygen atom free from an OZONE molecule. Depletion Global Warming is caused by the increase of and other gases in the Earth's atmosphere. CO2 The of a refrigerant indicates a refrigerant's ability to function as a greenhouse gas. GWP R-744 is , which does not deplete OZONE and has a very low global warming potential. Carbon Dioxide (TF)In most cases, the refrigerant recovered from a system is still in usable condition. True (TF)Reclaiming procedures often are preformed on the job site or at a local service shop. False (TF)The major difference in recovery units are usually in their size, weight, rate of refrigerant transfer, and safety devices that reduce the possibility of injury to inattentive operators. True (TF)Reclaiming is complicated and often involves processes that can include extensive filtering, drying, and distillation, as well as chemical processes to strip the refrigerant of impurities. True It is the service technician's responsibility to store recovered refrigerant in a properly evacuated approved storage tank specified for that particular type of refrigerant. Department of Transportation The definition of is to remove a refrigerant in any condition from a system and store it in an external container without necessarily testing or processing it in any way. Recovery If oil loss is a concern during refrigerant recovery, such as when the system compressor is not being replaces, refrigerant should be recovered in the state. Vapor EPA regulations prohibit the sale of CFCs and HCFCs that do not meet the minimum standards of AHRI- . 700 Refrigerant can be recovered in the or the vapor state. Liquid The definition of is to clean a refrigerant for reuse by oil separation and single or multiple passes through devices, such as replaceable filter-driers that reduce moisture, acidity, and particulate matter. Recycle is required when the contamination of refrigerant is so severe that the refrigerant does not meet industry standards and when recycling is not a viable option. Reclamation (TF)One-trip refrigerant cylinders cannot be refilled under any circumstances. True (TF)If a recovery tank is empty and at atmospheric pressure, it is recommended that the tank be turned upside down with the vapor valve open. True (TF)Each refrigerating machinery room shall have a tight-fitting door or doors opening outward, self-closing if they open into a building, and adequate in number to ensure freedom for persons to escape in an emergency. True (TF)All reusable cylinders should be stamped with the month and year of the last cylinder inspection and test. True (TF)Refrigerant cylinders must never be weighed during the filling process to ensure safety. False (TF)Per ASHRAE Standard Addendum d 11.2.94, each entrance to a refrigerating machinery room shall be provided with a legible permanent sign, securely attached and easily accessible, reading "Machinery Room -- Authorized Personnel Only." True The Pressure in a cylinder must be reduced to a maximum of psig before disposing of the cylinder. 0 Only fill a refrigerant cylinder to a maximum of % of the container's capacity. 80 On systems that contain flammable refrigerants, the process tubes and piping that extend one inch in either direction of the access point must be color-coded to indicate the flammable nature of the refrigerant contained in the system. Red Disposable, non-returnable cylinders are available in capacities ranging from , depending on the refrigerant type and the manufacturer. 15 Pounds to 50 Pounds U.S. Department of Transportation (DOT) Specification covers the transportation of refrigerant cylinders. 39 Per ASHRAE Standard addendum d, it shall be the duty of the person in charge of the premises on which a refrigerating system containing more than that will be developed when more than one relief device or fusible plug operates shall be considered. 55 To figure the maximum gross weight (MGW) of a tank, the tank's tare weight (TW) is added to % of the tank's water capacity (WC). 80 The classification of of a refrigerant is either A or B. Toxicity The information required by the on tagged refrigerants includes the date, refrigerant type, amount of refrigerant recovered, and the unit owner's information. Environmental Protection Agency (TF)If a system is a split-type system, where refrigerant must be field installed, the system 's total charge is determined by adding up the amount of refrigerant contained in each of the system's components and the interconnecting line set. True (TF)Any low-pressure refrigerant system may develop low side leaks that cause air to enter the machine and ultimately will cause significant amounts of refrigerant to be released though the purge unit. True (TF)The maximum allowable leak rate for comfort cooling is 20%. False (10%) (TF)Records of serviced appliances should include the quality of refrigerant (by type) that is added to, or recovered from, appliances being disposed of in each calendar month as well as any refrigerant surrendered for reclaiming or destruction. False (TF)The single most important and beneficial function that journey workers servicing HVACR equipment can perform in response to the issue of refrigerant leaks is being more attentive to locating and repairing leaks. True (TF)Good soldering and brazing techniques help to reduce refrigerant leaks. True If an appliance has an annual leak rate that exceeds %, the equipment owner must provide a report to the EPA that describes repair efforts for the system. 125% For comfort cooling applications, if it is determined that the 10% annual leak rate is exceeded, the equipment owner/operator has the legal obligation to have repairs made to the equipment within days 30 is the process of shutting a system down temporarily. Mothballing For commercial and industrial process refrigeration systems that exceed the maximum leak rates and contain more than pounds of an OZONE-depleting substance or substitute refrigerant, repairs must be made and leak inspections must be conducted every three months for one year to confirm the annual leak rate is below the maximum level. 500 process refrigeration systems include the equipment used for crop production, fuel extraction, and the manufacturing of commodities such as food products, machinery, chemicals, plastics, and electronics. Industrial Owners of appliances that contain or more pounds of refrigerant must keep service records documenting the data and type of service as well as the quality of refrigerant added. 50 (TF)All purchased recovery units must be registered with the EPA. False (TF)Vapor recovery is faster than liquid refrigerant recovery. False (TF)The two most common scenarios for vapor recovery are (1) to complete the recovery process once all the liquid refrigerant already has been recovered from the disabled system and (2) to minimize the loss of refrigeration oil from the disabled system. True (TF)The refrigerant recovery process requires testing, filtering, cleaning, and drying of the refrigerant. False (TF)When connecting hoses for a recovery process, use hoses that are as short as possible. True All contracting companies that service air-conditioning and/or refrigeration equipment must own at least one . Self-contained refrigerant recovery unit A " " system repair included the removal, repair, or replacement of a system compressor, condenser coil, evaporator coil or any other heat transfer. Major Technicians are required to recover refrigerant from air-conditioning and refrigeration equipment until established levels are reached in order to access the equipment's refrigerant circuit for maintenance, service, repair, or disposal. Vacuum The refrigerant recovery process can be sped up by lowering the in the recovery cylinder. Pressure In most cases, refrigerant recovery begins with the recovery of refrigerant. Liquid During the liquid refrigerant recovery, the vapor port on the recovery tank is open to the top of the tank, while the liquid port is connected to a that extends to the bottom of the tank. Dip Tube. (TF)Gauge manifolds are available only as analog gauges. False (TF)Never operate a system with both the low-side and high-side valves on the manifold open. True (TF)For the most part, refrigerant oils are not compatible with each other and every attempt should be made to prevent mixing oil types. True (TF)Gauge manifolds should be hung on the bulkhead in a van for storage at the end of a service call. False (TF)It is important that service technicians always use adjustable wrenches on valves with square stems. False (TF)An electric heat gun provides instant heat for defrosting coils. True (TF)Before an air-conditioning system is charged with refrigerant, it is important that the system be properly evacuated to a level of at least 50 microns. False A two-valve manifold has two valves and ports. Three A gauge manifold's system. REF gauge is used to charge, pressurize, and recover refrigerant from a Over-tightening the hose connections of a gauge manifold can damage the . O-Rings Used primarily in conjunction with servicing small appliances, a is used to help the service technician remove a line tap valve that has been installed on the process tube of the appliance. Pinch-Off Tool An ammeter is used to measure . current A is responsible for aiding in the removal of non-condensables and moisture from an HVACR system. Vacuum pump An leak detector utilizes a tracer oil solution that is injected into the refrigeration system and circulates with the refrigerant. Ultraviolet A tube is a curved, flattened piece of tubing that is sealed at one end, but open to the system pressure on the other end. Bourdon Both the VAC and the REF ports of a four-valve gauge manifold are referred to as the ports. Center fittings are required under EPA Section 608 regulations and failure to use them constitutes intentional refrigerant venting Low-Loss oil pumps are designed to allow refrigeration oil to be pumped into a compressor while the system is under pressure. Combination The process of involves expanding the end of a section of soft-drawn tubing so that it can accept another section of same-size tubing. Swaging The normal operating position for a system service valve is . Backseated When using electrical test instruments, resistance is measured in . Ohms Pressure testing should be done by pressurizing a system with . Nitrogen is the process of removing non-condensables, such as nitrogen, from a system, when dehydrating is the process of removing moisture. Degassing Electronic leak detectors cannot detect leaks in a system that has been pressurized with . Dry Nitrogen (TF)When servicing a small appliance, it is not mandatory to repair the leak, but it is strongly recommended that every effort be made to locate and repair all system leaks. True (TF)Refrigerators built before 1950 may have used methyl formate, methyl chloride, or sulfur dioxide as refrigerant and should not be recovered with current recovery devices. True (TF)When using a system dependent (passive) recovery process on an appliance with an operating compressor, run the compressor and recover the refrigerant from the low side of the system. False (TF)Refrigerants must not be mixed in a cylinder. True (TF)Whenever dry nitrogen from a portable cylinder is used in a service procedure, always install a relief valve in the downstream line from the pressure regulator. True (TF)Before beginning a refrigerant recovery procedure, it is always necessary to know the type of refrigerant in the system. True (TF)The speed of the refrigerant recovery procedure is affected by the ambient temperature, system size, length of refrigerant line set, system and recovery tank pressures, and the type of recovery unit used. True (TF)Passive recovery processes capture refrigerant into a pressurized container. False (TF)A storage cylinder of recovered R-22 at normal room temperature (about 75 degrees F) in the absence of non-condensables will be pressurized to 80 psi. False The EPA's definition of a "small appliance" includes products manufactured, charged, and hermetically sealed in a factory with pounds of refrigerant or less. 5 Certified technicians using recovery equipment to recover refrigerant from a small appliance with an inoperative compressor must have equipment capable of removing 80% of the appliance's refrigerant or achieving a inch vacuum under AHRI-740 standards. 4 A storage cylinder of recovered R-12 at normal room temperature (about 75 degrees F) in the absence of non-condensables, will be pressurized to psig. 75 An is an opening or access point in an appliance through which the system's refrigerant circuit can be accessed. Aperture piercing valves are for temporary use while recovering refrigerant. Clamp-On A storage cylinder of recovered R-500 at normal room temperature (about 75 degrees F) in the absence of non-condensables, will be pressurized to psig. 95 Never expose chlorinated or refrigerant to pen flames or glowing hot metal surfaces. Flourinated Since small amounts of CFC/HCFC refrigerant have no odor, when a pungent odor is detected during a sealed system recovery and/or repair, a has likely occurred. Compressor Burnout When recovering refrigerant from a system that has experienced a compressor burn-out, the technician should watch for signs of contamination in the because the system will have to be flushed if contaminants are present. Oil In the event of a "large" refrigerant release in a confined area, a is required. SCBA (TF)Pressurizing a system with dry nitrogen is the most desirable option for pressurizing a system. True (TF)In a building that has an air-cooled condenser on the roof and evaporator on the first floor, recovery should begin from the liquid line entering the evaporator. True (TF)The state of refrigerant leaving the receiver of a refrigeration system is a low-pressure liquid, so this is often the best place to recover refrigerant. False (TF)When a thermostatic expansion valve (TXV) is used in a refrigeration system, the receiver should always be installed in the liquid line at the inlet of the compressor. False (TF)Never energize a reciprocating compressor if the discharge service valve is open. False (TF)Once the leak detection process has been completed, nitrogen and trace refrigerant can be released to the atmosphere. False (TF)Before using a recovery unit, always check the service valve positions, the recovery unit's oil level, and evacuate and recover and remaining refrigerant from the unit's receiver. True (TF)Quick couplers, self-sealing hoses, and hand valves should be used (as low-loss fittings) to minimize refrigerant release when hoses are connected and disconnected. False (TF)A technician must isolate a parallel compressor system to avoid an open equalization connection from preventing refrigerant recovery. True The equipment covered under EPA Section 608 Type II includes those systems that operate with a refrigerant that has a liquid saturation pressure above ____ psig at a temperature of 104 degrees F. 30 Newly installed residential air-conditioning systems likely will be using refrigerant . R-410a R-12 at a room temperature of 72 degrees F will have a pressure of approximately psig. 74 Refrigeration units using an open compressor, especially one that has not been operating for several months, are likely to leak from the . Rotating Shaft Seal When evacuating a vapor compression system, the vacuum pump should be capable of pulling microns of vacuum, which is the minimum evacuation level that should be reached before charging a system. 500 The should be replaced when any system is opened for servicing. Filter-Drier On most hermetic compressors, the valve is internal and cannot be inspected. Pressure Relief (TF)The annual leak rate is determined by comparing the amount of refrigerant added to a system over the course of a year to the system's total charge. True (TF)Introducing liquid into a deep vacuum will cause a refrigerant to freeze and may lower temperatures enough to freeze water in tubes. False (TF)Generally, it is appropriate to evacuate high-pressure systems with large leaks to atmospheric pressure. True (TF)The most efficient method of leak checking a charged low-pressure refrigeration unit is to decrease the system's pressure using controlled cold water. False (TF)The ASHRAE Guideline 3-1990 states that if the pressure in a system rises from 1 mm HG to a level above 2.5 mm Hg during a standing vacuum test, the system should be checked for leaks . True When leak testing a low pressure, centrifugal system with nitrogen, do not exceed psig. 10 An average 350 ton R-11 chiller at 0 psig still contains of vapor after all the liquid has been removed. 100 Before charging with liquid, a refrigeration system with R-11 requires a vapor pressure of " Hg vacuum in the shells. 16.9 Non-condensables are removed from a system by the system's . Purge Unit A temperature of degrees F should be attained when removing oil from a low-pressure system. 130 On low-pressure chillers, the is the safety pressure relief valve. Rupture Disc A test kit is used to determine if heat exchanger tubes are leaking. Hydrostatic When removing from a refrigeration system, the system water pumps, the recovery compressor, and the recovery condenser water all should be on. Vapor Between a heat pump and an air conditioner, what's the primary difference? Reversing valve When the leak rate exceeds the charge per year, EPA regulations require that leaking commercial or industrial process refrigeration equipment be repaired. 30% Blue color on manifold gauge set is low pressure gauge Red color on manifold gauge set a is high pressure gauge Stratospheric Ozone Depletion ODP Global Warming Pontential GWP CFC, includes R-11 and R-12 Chloeodluorocarbon has the highest ozone depletion Hydrochlorofluorocarbon R-22 and R-123 HCFC, hydrogen makes them alittle less ha