(Answered) EPA SECTION 608 CORE ( revision)
EPA SECTION 608 CORE ( revision) A disposable cylinder should be reduced to what pressure before scrapping? a. 0 psig b. 20 psig c. 50 psig d. 80 psig A major system repair is being performed on a R-22 appliance. What CANNOT be done to recharge the appliance? a. Add R-22 after the repair is complete. b. Retrofit the unit to R-407C. c. Use recovered or recycled R-22 from the same owner. d. Top off the unit with R-410a. A refillable cylinder must not be filled above what percent of its capacity by weight: a. 50% b. 70% c. 80% d. 95% A refrigerant label to identify the type of refrigerant recovered is placed on recovery equipment for all of the following reasons, EXCEPT to: a. Avoid accidental mixing of refrigerants. b. Allow the recycler to identify the contents. c. Tell if the cylinder is safe d. Allow the technician's company to determine the amount of refrigerant recovered for record keeping purpose. After the phase-out of a refrigerant, where will supplies of that refrigerant for equipment servicing come from? a. recovery and reclaimed gas b. solvent conversion c. foreign manufacturers d. Exemptions granted under the Montreal Protocol Although the saturation pressure-temperature behavior of two refrigerants might be similar, of all the following characteristics of the refrigerants being compared, what must also be considered? a. Latent heat of evaporation b. Cooling effect per volume c. Necessary volumetric displacement of the compressor d. potential to oxidize copper tubing An example of a CFC refrigerant is: a. R-134a b. R-123 c. R-22 d. R-12 As of 2017, how much can a technician be fined for violating the Clean Air Act, including knowingly releasing non-exempt refrigerant from appliances. a. $10,000 per day per violation b. $17,531 per day per violation c. $27,500 per day per violation d. $44,539 per day per violation Chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), and hydrofluorocarbons (HFCs), have which of the following in common? a. They deplete the stratospheric ozone layer. b. They contain chlorine. c. They must be recovered before opening or disposing of appliances. d. They have the same saturation pressure at 70°F Distributors must verify which of the following before they can sell HFC or HCFC refrigerant? a. The Distributor is a section 608 certified distributor. b. The distributor is selling section 608 certified refrigerant. c. The purchaser owns certified recovery and/or recycling equipment. d. The purchaser is or employs a Section 608 certified technician. During servicing of a refrigeration system containing either R-22 or R-410A, the refrigerant must be: a. Replaced with R-32 b. Recovered c. Vented d. Destroyed EPA does NOT require technicians(or the company employing the technician) to keep which of the following records when disposing of appliances with 5-50 pounds of refrigerant? a. The model and serial number of the appliance. b. The type of refrigerant recovered. c. The quantity of refrigerant, by type, recovered from disposed appliances in each calendar month. d. The quantity of refrigerant by type, sent for reclamation or destruction. For an appliance that uses a CFC, HCFC, or HFC refrigerant, which of the following violates the prohibition on venting? a. Accidental releases associated with timely repair of an appliance. b. Refrigerants emitted when cutting a line without properly evacuating the appliance. c. Refrigerants emitted in a catastrophic failure of an appliance. d. Refrigerants emitted when connecting or disconnecting low loss hoses to charge or service an appliance. From which of the following does the ozone layer protect the earth? a. Nuclear radiation from the Van Allen belt. b. Gamma radiation form the sun. c. Ultraviolet radiation from the sun. d. Infrared radiation from the sun. HCFC refrigerants contain which of the following? a. Helium, Carbon, Fluorine, & Chlorine b. Hydrogen, Chlorine, Ferrite, & Carbon c. Hydrogen, Chlorine, Fluorine, &Carbon d. Hydrogen, Chlorine, Fluorine, & Calcium HFC refrigerants contain which of the following? a. Chlorine, Fluorine, & Carbon b. Chlorine, Fluorine, & Hydrogen c. Hydrogen, Chlorine, & Carbon d. Hydrogen, Fluorine, & Carbon How do refrigerant blends leak from a system? a. At a faster rate than other refrigerants b. At uneven rates due to different vapor pressures. c. At a slower rate than other refrigerants. d. In exactly the same way as other refrigerants. How do the global warming potentials of isobutane (R-600a), propane (R-290), and R-441A compare to the GWPs of HFC-134a, R404A, and R-410A? a. They are significantly higher. b. They are significantly lower. c. They are approximately equal d. They are slightly higher. How does cooling occur in direct expansion vapor compression refrigeration systems? a. When the refrigerant vapor turns into a liquid. b. When the refrigerant is under maximum pressure. c. When the liquid refrigerant is vaporized. d. When the refrigerant gives off heat. How does the global warming potential of R-410A compare to that of carbon dioxide? a. It is lower. b. They are equal. c. It is hundreds of times greater. d. It is thousands of times greater. How many ozone molecules can each chlorine atom in the stratosphere destroy? a. 1,000 molecules b. 100,000 molecules c. 100,000,000 molecules d. None. Chlorine is not the element in refrigerant that harms ozone. How should disposable cylinders of CFCs, HCFCs, and HFCs be discarded? a. Bleed any remaining refrigerant to ambient air and put the cylinders into a trash dumpster. b. Recover all remaining refrigerant, render the cylinders useless, and recycle the metal. c. Refill the cylinders at an approved facility and reuse. d. Reuse the cylinders as recovery tanks. How should refrigerant blends be charged? a. As a vapor b. At very high temperatures c. As a liquid d. The same as any other refrigerant If a large leak of refrigerant occurs what action should be taken when no self-contained breathing apparatus is available? a. Use butyl line gloves and try to stop the leak. b. Use a lake detector to locate and try to stop the leak. c. Vacate and naturally ventilate the spill area. d. Make sure the unit is de-energized, close the service valves, and try to stop the leak. In addition to fines and being required to appear in court, what penalty can be imposed on service technicians who violate Clean Air Act provisions? a. They may lose their certification. b. They may have equipment confiscated. c. They may be required to take mandatory training. d. They may be required to pass an online test. In the event of a large release of CFC, HCFC, or HFC refrigerant in a contained area which of the following is true? a. Safety googles and lined butyl gloves are sufficient. b. Self-contained breathing apparatus(SCBA) or leaving the area is required. c. Respiratory protection is not required. d. Dust masks are sufficient In which component of a system does the refrigerant change from a high-pressure vapor to a high-pressure liquid? a. Receiver b. Metering device c. Accumulator d. Condenser In which of the following scenarios can refrigerant be vented? a. Releasing R-410a from household refrigerators. b. Releasing mixed refrigerant from a recovery cylinder. c. Releasing isobutane from a household freezer. d. Releasing R-22 from appliances with a charge less than 5 pounds. Manufacture's often color code the exterior of gauges. What color is the low pressure gauge on a typical gauge manifold set? a. Green b. Yellow c. Blue d. Red Ozone depletion in the stratosphere is what type of problem? a. Local b. Regional c. National d. Global Recovery equipment that relies on the compressor in the appliance and/or the pressure of the refrigerant in the appliance would be considered: a. System-dependent b. Self-contained c. A packaged terminal unit d. Self-sufficient Refrigerant cylinders should be all of the following EXCEPT: a. Be free of rust and damage. b. Filled to 95% of capacity. c. Be labeled. d. Be secure. State and local governments may; a. not establish any laws related to refrigerants. b. establish laws that are not as strict as the Clean Air Act/EPA regulations c. establish laws that contain stricter requirements than the Clean Air Act/EPA regulations d. establish laws that exempt refrigerants from the Clean Air Act. The color marking that is required on all pipes, hoses, or other devices which a flammable refrigerant passes and where a service connection is probable, must extend a minimum of how many inch(es) in both directions from such locations? a. 1 b. 2.5 c. 3.5 b. 4.6 The date when the production and import of new R-22 in the U.S. ends is; a. 2018 b. 2020 c. 2022 d. 2025 Under EPA's regulations, what standard must reclaimed refrigerant meet before it can be resold? a. AHRI 700 b. EPA 700 c. ASHRAE 700 d. UL 700 Under the Section 608 "safe disposal requirements", who is responsible for ensuring that refrigerant has been removed from household refrigerators before they are disposed of? a. The final person in the disposal chain. b. The service technician who last worked on the equipment. c. The manager/supervisor of the service company that last serviced the equipment. d. The Environmental Protection Agency field staff. Under what conditions may you use a disposable cylinder to recover refrigerant? a. When the system contains the same refrigerant as a cylinder. b. When they system contains less than 10lbs of refrigerant. c. When disposing of the refrigerant. d. Never What are the characteristics of hydrofluoroolefins (HFOs)? a. Non-ozone depleting and have high global warming potentials. b. Non-ozone depleting and have low global warming potentials. c. Ozone depleting and have high global warming potentials. d. Ozone depleting and have low global warming potentials. What can CFC and HCFC refrigerants decompose into at high temperatures (e.g. open flames, glowing metal surface, etc...)? a. Boric and chromic acids b. Sulfuric and Phosphoric acids c. Hydrochloric and Hydrofluoric acids d. Phosphoric and dodecylbenzenesulfonic acid. What can ester based oils be mixed with? a. Pag oils b. Paraffinic mineral oils c. Alkylbenzene oils d. No other oils What characteristics of CFCs and HCFCs make them more likely to reach the stratosphere than most other compounds containing chlorine? a. They do not dissolve in water or easily break down in the atmosphere. b. They are lighter than other chlorine compounds, making it easier for them to reach the stratosphere when released. c. They are stored under pressure, causing them to jet upward when released. d. They are attracted to Ultraviolet radiation. What characteristics of HFC refrigerants make them damaging to the environment? a. They are toxic to plants and animals at low doses. b. They contain chlorine which damages the ozone layer. c. They have high Ozone Depletion Potential (ODP) d. They can have very high global warming potentials. potentials. What does a section 608 certification allow a technician to do? a. Import R-22 from overseas. b. Purchase or handle controlled refrigerants c. Service motor vehicle air conditioners d. Perform any type of work on any type of HVACR equpment What does ozone depletion potential (or ODP) measure? a. The ability of a substance to cause global warming b. The ability of a substance to destroy ozone in the stratosphere c. The rating of health hazards caused by ozone depletion d. The length of time a refrigerant stays in the atmosphere. What does ozone in the stratosphere above the earth consist of? a. Molecules containing 2 oxygen atoms. b. Molecules containing 3 oxygen atoms. c. Molecules containing 4 oxygen atoms. d. Molecules containing 5 oxygen atoms What effect will low ambient temperatures have on recovery? a. Shortened recovery time b. Increase the recovery time c. Minimize emissions. d. Require frequent drier changes. What evidence demonstrates that chlorine in the stratosphere is primarily from man-made chemicals rather than from natural sources such as volcanoes? a. The rise in the amount of chlorine measured in the stratosphere matches the rise in the amount of fluorine, which has different natural sources than chlorine, over the same period. b. The rise in the amount of chlorine measured in the stratosphere matches the rise in ODS emissions over the same period. c. Samples of air taken from the stratosphere over erupting volcanoes show that volcanoes contribute a small quantity of chlorine to the stratosphere compared to CFCs and HCFCs. d. All of the listed reasons. What factor does NOT affect the speed of evacuation? a. The size of the equipment being evacuated. b. The ambient temperature. c. The amount of moisture in the system. d. The brand of micron gauge used. What happens if EPA regulations change after a technician becomes certified? a. The technician certification is grandfathered for one year to allow time for recertification. b. It will be the technician's responsibility to comply with any future changes in the law. c. The technician must take a new online certification test. d. The technician must attend a class to become recertified. What is a characteristic of a refrigerant oil that is hygroscopic? a. It is a good lubricant. b. It is crude oil and unrefined. c. It readily absorbs moisture. d. It can be left open to the ambient air. What is a ternary blend of refrigerant? a. A two-part mixture b. A three-part mixture c. A four-part mixture d. A five-part mixture What is being done in the U.S. to stop damage to the stratospheric ozone layer? a. Using natural gas instead of coal to generate electricity. b. Phasing out the use of chlorofluorocarbons and hydrochlorofluorocarbons. c. Enforcing strict emission requirements on incinerators. d. Increasing the energy efficiency of air conditioners. What is one of the most serious results of damage to the stratospheric ozone layer? a. Increased acid rain b. Increased rates of asthma c. Increased rates of skin cancer in humans d. Higher natural background radioactivity What is the approximate pressure of a storage cylinder of recoverd R-410A that does not contain any non-condensabe impurities and is and is stored in a room where the temperature is 80° F? a. 138 psig b. 238 psig c. 338 psig d. 368 psig What is the maximum normal charge of HCFC or HFC refrigerant in an appliance that is allowed to use system dependent recovery equipment? a. 5 pounds b. 10 pounds c. 15 pounds d. 50 Pounds What is the Montreal Protocol? a. An international treaty that addresses ozone- depleting substances and their alternatives. b. A test for energy efficiency adopted by the Canadian Government. c. A procedure for measuring levels of CFCs in the atmosphere. d. A test for ozone concentration What is the name of the EPA's program that identifies refrigerants with lower overall risks to human health and the environment? a. The Significant New Alternatives Policy (SNAP) Program. b. The GreenChill Program c. The Approved ASHRAE List(AAL) d. Energy Star What is the state of refrigerant entering the compressor of a refrigeration system? a. Low pressure subcooled liquid b. Low pressure superheated vapor c. High pressure subcooled liquid d. High pressure subcooled vapor What is the strongest evidence that HCFCs are in the stratosphere? a. Chemical reactions predict there should be HCFCs in the upper atmosphere. b. Measurement of chlorine in air samples from the lower atmosphere. c. Measurement of HCFCs in air samples from the stratosphere. d. Satellite measurements of light passing through the atmosphere. What is unique about an azeotropic refrigerant mixture? a. It is a mixture of refrigerants that is easily made. b. It has a pressure temperature curve identical to one of its components. c. It may not be charged in the vapor phase and must only be charged in the liquid phase. d. It is a mixture that acts like a single component refrigerant over its entire range. What must be done before disposing of any appliance containing a CFC, HCFC, of HFC refrigerant? a. Recover the refrigerant b. Purge the appliance with nitrogen c. Flush the appliance with r-134a b. Seal the appliance so no refrigerant can escape. What range is displayed on a high pressure gauge on a service manifold? a. 500 microns to 0 pis b. 0 to 200 psi c. 0 to 800 psi d. 250 psi to 750 psi What should a technician do if they discover that some R-410A was added to an R-22 system? a. Vent the refrigerant since it cannot be relcaimed. b. Recycle the refrigerant. c. Recover the mixture in a separate recovery tank. d. Recover and use in another system. What should a technician do if they lose their section 608 certifcation card. a. Request a replacement from the EPA. b. Request a replacement from the certifying organization. c. Remain silent so as not to tell anyone they are out of compliance with that requirement. d. Have your friend vouch for you. What synthetic lubricant is presently used with ternary blends containing HCFCs? a. Alkylbenzene b. Glycol c. Ester d. Castor oil What type of synthetic oils are commonly used in new HFC systems and for retrofitting HCFC equipment to HFC refrigerants? a. Polyolester b. Glycol c. Alkyl-benzene d. Mineral Oil What units does a compound pressure gauge for the low side of they system measure pressure in? a. Psia b. Torrs and microns c. Psig and inches of mercury d. Psia and microns When checking for non-condensables inside a recovery cylinder known to contain only one refrigerant, why should the technician allow the temperature of teh cylinder to stabilize to room temperature before taking a pressure reading? a. To prevent safety valves from purging refrigerant b. It is a quick method of determining refrigerant levels inside the tank. c. Comparisons to a pressure-temperature chart are only valid if both the pressure and temperature of the refrigerant are stable and known. d. A temperature reading alone is enough to determine refrigerant quality, When do EPA's refrigerant management regulations exempt refrigerant from the venting prohibition? a. When the EPA has determined that the refrigerant in that type of appliance does not pose a threat to the environment if released. b. When you do not vent refrigerant in excess of the leak rate threshold. c. When there are no available disposal facilities. d. When it is done in a well-ventilated area. When transporting cylinders containing used refrigerant, DOT requires that you: a. Use OSHA-approved containers b. Attach a DOT classification tags. c. Ship by EPA certified carrier. d. Do all of the above. When working with an appliance containing HCFCs or HFCs, which of the following does NOT require a person to be a Section 608 certified technician? a. Removing refrigerant. b. Rewiring an external electrical circuit. c. Replacing a component. d. Performing any activity that violates the refrigerant circuit. Which element in a CFC or HCFC molecule causes ozone depletion? a. Fluorine b. Chlorine c. Carbon d. hydrogen Which of the following appliances is NOT covered by EPA section 608 regulations? a. Freezers b. Air Conditioning and Refrigeration Equipment c. Commercial Refrigeration Equipment d. Desiccant Dehumidifiers Which of the following factors affect the speed of system dehydration? a. The ambient temperature and entropy of the refrigerant. b. The ambient temperature and amount of moisture in the system. c. The latent heat content of the refrigerant. d. The system superheat. Which of the following gases is used as the baseline measurement for global warming potential? a. Ammonia b. Carbon Dioxide c. CFC-12 d. Propane Which of the following is a HFC refrigerant? a. R-134a b. R-115 c. R-22 d. R-11 Which of the following is a high-pressure refrigerant under EPA's section 608 regulations? a. R-410A b. R-113 c. R-123 d. R-11 Which of the following is a lawful use of HCFC-22? a. Creating new air conditioner systems using "dry- charge" components? b. Servicing existing R-22 systems. c. Charging any new system designed for R-407C. d. Retrofitting any equipment. Which of the following is a requirement for all CFC, HCFC, and HFC refrigerant recovery devices? a. They must be portable b. They must contain a heavy duty shield c. They must have a 20,000 btu/hr rating. d. They must meet EPA standards. Which of the following is an approved 'drop-in'service replacment for R-22? a. HFC-134a b. R-407C c. R-407A d. There are no direct 'drop-in' refrigerant substitutes. Which of the following is considered an unacceptable release of CFC, HCFC, or HFC refrigerant? a. Release during the procedure of installing manifold gauges equipped with low-loss fittings. b. Release during vandalism or theft of equipment. c. Release during the connection of a recovery machine equipped with low loss fittings. d. Release during a leak-checking procedure using nitrogen and a trace gas. Which of the following is illegal? a. Using CFC, HCFC, or HFC refrigerants b. Manufacturing or importing HFO refrigerants into the U.S. c. Knowingly release CFC, HCFC, or HFC refrigerants during the service, maintenance, repair, or disposal of appliances. d. Selling recovered refrigerant to a reclaimer. Which of the following is NOT a "refrigerant" as it is used in section 608 of the clean air act? a. An ozone-depleting substance used in a household or commercial air conditioner. b. A non-ozone depleting substance used in a refrigerator or freezer. c. Any substitute for a Class I or Class II substance used in a chiller. d. A leak trace gas Which of the following is not a reason to recover refrigerants? a. Provide supplies for service after the refrigerant has been phased out. b. Prevent venting to the atmosphere. c. Prevent stratospheric ozone depletion. d. Avoid violating the warranty on equipment. Which of the following is NOT a recommended safety practice when operating refrigerant recovery or recycling equipment? a. Wear safety glasses. b. Wear protective gloves. c. Follow all safety precautions for the equipment. d. Remain at least 5 feet away from any operating equipment. Which of the following is not a violation of the Clean Air Act or EPA's regulations? a. Failing to keep required records. b. Failing to meet the required evacuation levels before opening or disposing of appliances. c. Knowingly releasing CFC, HCFC, or HFC refrigerants while repairing appliances. d. Knowingly recovering an exempt refrigerant. Which of the following is not a violation of the refrigerant management regulations under the Clean Air Act? a. Failing to recover refrigerant in a system to the required evacuation level. b. Servicing a system that uses CFCs or HCFCs after the phaseout of those refrigerants. c. Failing to recover refrigerant in a leaking system to at least 0 psig. d. Adding nitrogen to a fully charged system, then call the mixture a "leak check gas" and venting the mixture to the atmosphere. Which of the following leak detection methods is considered to be the most effective for locating the general area of a small leak? a. Standing vacuum test b. Electronic or ultrasonic tester c. Halide torch d. Audible sound Which of the following refrigerant releases is considered a violation of the prohibition on venting? a. Release of "de minimis" quantities in the course of making good faith attempts to recapture and recycle or safely dispose of refrigerant. b. Release of mixtures of nitrogen and refrigerant that result from adding nitrogen to a fully charged system to leak check the appliance. c. Refrigerants emitted in the course of normal operation of an appliance. d. Refrigerants emitted when connecting or disconnecting low loss hoses to charge or service an appliance. Which of the following refrigerants contain chlorine? a. R-22 b. R-134a c. R-410a d. R-1234yf Which of the following refrigerants contain chlorine? a. R-22 b. R-134a c. R-410A d. R-1234yf Which of the following refrigerants damages stratospheric ozone? a. HFOs b. HFCs c. HCFCs d. Ammonia Which of the following refrigerants has the lowest ozone depletion potential? a. R-22 b. R-123 c. R-410A d. R-502 Which of the following refrigerants has the lowest global warming potential? a. R-134a b. R-407C c. R-410A d. R-600a Which of the following refrigerants have an ozone depletion potential of more than zero? a. R-600a and R-441A b. R-134a and R-410A c. R-123 and r-22 d. R-290 and r-404A Which of the following refrigerants is an HFO? a. R-1234yf b. R-123 c. R-134a d. All three are HFOs Which of the following refrigerants is very high pressure and generally does NOT need to be recovered? a. R-22 b. R-134a c. R-404 A d. R-744 Which of the following releases of refrigerant is illegal? a. Venting a refrigerant that EPA has determined does not pose a threat to the environment. b. Venting refrigerant from a recovery machine or recovery cylinder. c. Releasing refrigerant while connecting or removing low loss service hoses. d. Small "de-minimis" releases while making a good faith effort to recover refrigerant. Which of the following statements about "self-contained" recovery devices is true? a. They are evacuated cylinders capable of liquid transfer. b. They remove refrigerant from an appliance without the assistance of components in the appliance. c. They have a self-contained power source that requires periodic charging. d. They can only be used on air conditioning and refrigeration equipment containing less than 15 pounds of refrigerant. Which of the following statements is true? a. There is no difference between refrigerant grade hydrocarbon refrigerant and propane for grills. b. Propane cylinders for grilling contain impurities that can damage refrigerant equipment. c. Refrigerant-grade hydrocarbon refrigerant is of lower quality than consumer propane cylinders. d. Hydrocarbon refrigerants can be used as a retrofit refrigerant. Which of these gases help form the earth's protective shield? a. Methane b. Radon c. Stratospheric Ozone d. Carbon Dioxide Which process applies to cleaning refrigerant for immediate reuse by oil separation and single or multiple passes through devices, like replaceable core filter driers, which reduce moisture and acidity? a. Recycling b. Recovering c. Reclaiming d. Restoring Which refrigerant can be purchased by someone who is NOT a section 608 certified technician? a. Carbon Dioxide Refrigerant b. Hydrofluorocarbon Refrigerants c. Hydrofluoroolefin Refrigerants d. Hydrochlorofluorocarbon Refrigerants Which refrigerant depletes the ozone layer? a. R-717 b. R-744 c. R-22 d. R-32 Which refrigerant does not contain chlorine? a. R-134a b. R-12 c. R-22 d. R-124 Which type of lubricants are HFO refrigerants Miscible in? a. AB lubricants b. POE lubricants c. Mineral oils d. All refrigerant lubricants Which type of refrigerant has the highest ozone depletion potential (ODP)? a. HCFCs b. HFCs c. CFCs d. HFOs Which type of refrigerant is the most harmful to stratospheric ozone? a. CFCs b. HCFCs c. HFCs d. HFOs Which type of refrigerant typically has the lowest global warming potential? a. HCFCs b. HFOs c. HFCs d. All are equal Which types of refrigerant can only be sold to persons who have successfully passed teh EPA's section 608 certification exam? a. Only ozone-depleting substances used in comfort cooling. b. Only non-ozone-depleting substances used in commercial refrigeration. c. Only substitute refrigerants used in industrial process refrigeration. d. All refrigerants that are not exempt from the venting prohibition Which word applies to the process that returns refrigerant to new product specifications and that requires chemical analysis? a. Recovery b. Recycle c. Reprocess d. Reclaim Why are HFO refrigerants less flammable than hydrocarbon refrigerants? a. They contain chlorine. b. They contain bromine. c. They contain fluorine. d. They contain carbon. Why are some of the hydrofluoroolefins classified as A2L? a. They have toxicity characteristics. b. They are less flammable than hydrocarbon refrigerants, but most are still mildly flammable. c. They are prohibited for use in the U.S. d. They have ozone depleting potentials and have low global warming potentials. Why do EPA regulations require appliances to have a service aperture or process stub. a. To make it easier to recover refrigerant. b. To check for open motor windings. c. To vent non-condensibles. d. To dehydrate the system oil. Why should solderless type piercing valves NOT remain installed on refrigeration systems after completion of repairs. a. They are too expensive to remain on every product b. They tend to leak over time c. They restrict refrigerant flow d. They tend to trap lubricant. You have to leak check a unit which has lost a complete charge. Which gas(es) would cause the LEAST damage to the environment? a. Dry nitrogen and R-22 b. Compressed air and R-12 c. Dry nitrogen d. Dry nitrogen and R-134a
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- EPA SECTION 608 CORE
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epa section 608 core 2021 2022 revision
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a disposable cylinder should be reduced to what pressure before scrapping a 0 psig b 20 psig c 50 psig d 80 psig
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