EPA Test 2023 with 100% correct questions and answers

Date technicians servicing small appliances must have been EPA certified? November 14, 1994 Date when technicians must have been certified to the EPA that they have equipment capable of meeting ARI 740 recovery requirements August 12, 1993 All recovery devices manufactured before ________________, for use with small appliances must be capable of recovering 80% of refrigerant whether or not the compressor is operational. Alternatively, the system can be recovered to 4-inches of mercury vacuum. November 15, 1993 Small appliance recovery equipment manufactured on or after ___________________, must be certified (by an EPA approved laboratory) to be capable of recovering 80% of the refrigerant when the system's compressor has failed, or 90% of the refrigerant when the system's compressor is operational. Alternatively, the system can be recovered to 4-inches of mercury vacuum. November 15, 1993 Small appliances manufactured after __________________, must be equipped with a process stub. The process-stub is a straight piece of tubing that is entered using a piercing access valve. November 15, 1993 What refrigerant is currently being used as a replacement for CFC-12 in household refrigerants: however, it is not a drop-in replacement? HFC-134a EPA regulations define it as one manufactured, charged, and hermetically sealed at the factory and containing 5 pounds or less of refrigerant. "small appliance" Recovery devices can capture liquid and/or vapor refrigerant without the assistance of components in the air conditioning or refrigeration equipment. "Self-contained" recovery devices are so named because they depend on components of the system; that is, they capture refrigerant with the assistance of components in the air conditioning or refrigeration equipment they are emptying. "System-dependent" System-dependent recovery equipment CANNOT be used when the appliance contains over? 15 pounds of refrigerant This is a gas that consists of 3 atoms of oxygen in each molecule. The Ozone This is about 7-28 miles above the earth and it is made of Ultra Violet light (UV) The Stratosphere Refrigerants that contain _________________ but not ________________ do not break down in the lower atmosphere not even a hundred years later. Chlorine, Hydrogen A thinning in the Ozone layer. "Ozone Hole" When ozone depletion occurs, more _______________________ penetrates to the Earth's surface. Ultra Violet (UV) radiation CFC Chlorine, Fluorine, Carbon HCFC Hydrogen, Chlorine, Fluorine, Carbon Since they contain no Hydrogen, _____________ are chemically very stable, even when released into the atmosphere, but since they contain Chlorine, ____________ are damaging the ozone layer high above the Earth's surface. CFC _________ , _________ were commonly used before Montreal protocol regulations. R-11, R-12 ____________ is unstable and breaks down before reaching the higher atmosphere, not as damaging to the ozone layer. Potentially! HCFC These three are HCFC's R-22, R-123 and R-124 This greenhouse gas contains no Chlorine at all. Hydrofluorocarbon (HFC) This new HFC is already replacing R-12 and R-134a HFC-134a On this date: Mandatory use of certified recycling equipment when servicing automotive (not commercial/residential/industrial) air conditioning. January 1, 1992 On this date: The Clean Air Act calls for a phase-out of CFC/HCFC production, prohibits CFC/HCFC venting, and requires the EPA to set standards for recovery, recycling, and reclamation of refrigerants. July 1, 1992 On this date: All persons opening appliances (except for small appliances and motor vehicle A/C) for maintenance, service, or repair, and all persons disposing of appliances, except for small appliances, must have at least one piece of certified, self-contained recovery equipment available at their place of business. July 13, 1993 Since ___________________ , refrigerant recovery devices must be equipped with low-loss fittings, which are fittings that are used to connect the recovery device to an appliance and which can be either manually closed of which closes automatically when disconnected to prevent loss of refrigerant from hoses. November 15, 1993 Recovery equipment manufactured after _____________________ that is used during maintenance, service, or repair must be certified by an EPA-approved laboratory. November 15, 1993 Since __________________________ , technicians serving refrigerant hardware must be certified in refrigerant recovery and the sale of refrigerants has been restricted to technicians certified in refrigerant recovery. November 14, 1994 Since ____________________________ , CFCs can no longer be legally manufactured or imported into the United States. Supplies of CFC refrigerant for equipment servicing can ONLY come from recovery, recycling, and reclamation. December 31, 1995 Since ______________________ , it has been illegal to vent any refrigerant including substitutes for CFC, HCFC and HFC refirgerants. This is because the EPA has determined that all refrigerants contribute to global warming. November 15, 1995 The internal pressure of a cylinder with one ounce of liquid refrigerant is exactly the same as __________________ . a full cylinder Disposable and refillable cylinders also are regulated in their ____________ , _____________ , _____________________________ for use in transportation of refrigerants. design, fabrication, and testing by the D.O.T. Whenever a technician is working with unknown solvents, chemicals, or refrigerants, the technician should always __________________________ , which by law should be shipped by the manufacturer with these compounds. review the material safety data sheets Refrigerants are also _____________________________ and can displace the air in a room, leaving no breathing air in the room (leading to asphyxia). heavier than air _________________ and _________________ in refrigerants cause stratospheric ozone depletion. Chlorine, Bromine ________are chemically very stable; they do not dissolve or breakdown in water (so they are not removed by rain). Because of this chemical stability, ________ are able to reach the stratosphere. CFCs The ozone layer protects the Earth from ultraviolet radiation from the sun. _________________________________________________________________________ are some possible results of damage to the Earth's ozone layer. skin cancer, cataracts, suppression of the immune system, reduced crop yields, reduced marine life, increased degradation of polymers, and climate change Samples of air taken from the stratosphere over erupting volcanoes contribute only a small quantity of Chlorine to the stratosphere when compared to _________ . CFCs When addressing consumer complaints regarding additional service expense caused by recovery efforts, the technician needs to explain to the customer that ______________________________________________________________________________________________________ . recovery is necessary to protect human health and the environment, that it is required by federal law, and that you are duty bound to follow the law and protect the environment. Capturing and ultimately eliminating the use of chlorofluorocarbons is being done in the United States to ____________________________________ stop damage to the stratospheric ozone layer. State and local governments may establish laws that contain __________ regulations than the Clean Air Act/EPA regulations. stricter The ________________________ calls for the phase-out of CFC/HCFC production, prohibits refrigerant venting, and requires the EPA to set standards for recovery, recycling, and reclamation of refrigerants. Clean Air Act Disposing of disposable cylinders is accomplished by assuring that __________________ , that __________________ , and then __________________ all refrigerant is recovered, the cylinders are rendered useless, recycling the metal. Service technicians who violate Clean Air Act provisions can be __________ , _____________________ , ______________________________ . fined, lose their certification, and face federal charges and fines. An award of up to __________________ may be paid to any person supplying information that leads to a penalty against a technician who is intentionally venting refrigerant. $10,000 Violation of the Clean Air Act, including the knowing release of refrigerant during the maintenance, service, repair, or disposal of appliances, can result in fines up to ______________ per day per violation. $32,500 When using a vacuum pump, every effort should be made to reduce the pressure drop between vacuum pump and the system. Therefore the piping connection should be __________________ (using the largest diameter pipe that is practical). as short as possible Chlorofluorocarbons, hydrochlorofluorocarbons, hydrobromofluorocarbons (HBFCs) and halons are all controlled by the ______________________________ . Montreal Protocol Under EPA regulations, reclaimed refrigerants must meet ________________ standards for purity before it can be resold. ARI-700 All devices used for refrigerant recovery must meet ________________________________ . EPA evacuation standards ________________________________________ are assumed by the EPA to be the most effective method for locating the general area of small leaks. Electronic/ultrasonic testers Appliances containing refrigerant can be evacuated to atmospheric pressure instead of sub-atmospheric pressures when leaks in the appliance make evacuation to the EPA-prescribed level unattainable because air would be drawn into the recovery device from the surroundings. However, the appliances must always be evacuated to at least ____ psig. 0 A __________________________ must never be operated when the system is evacuated because the refrigerant flow is used for cooling, and in the absence of refrigerant, no cooling will occur, resulting in rapid motor burn out. hermetric compressor Never use ____________________ or __________________________ to leak-check hardware because some refrigerants, when mixed with air or oxygen, can explode. oxygen, compressed air Approved refrigerant recovery cylinders can be identified by _________________ and _______________ . yellow tops, gray bodies Reusable refrigerant containers that are under high pressure (above 15 psig at normal ambient temperature) must be hydrostatically tested and date stamped every _________________ . five years Never heat a refrigerant storage or recovery tank with an _________________________ because the tank may explode. open flame When first inspecting a hermetic system known to be leaking, you should look for traces of ________ because this is an excellent indication of leaks. oil When a refrigerant leak check trace gas becomes absolutely necessary, only an _________________________________ mixture can be used as the trace gas. HCFC-22 nitrogen Every refrigerating system and refrigerant cylinder must be protected by a ___________________________________ . pressure-relief device PSIG is the abbreviation for a unit of pressure measurement and it stands for _______________________________________________ . This is the scale normally used on American refrigerant pressure gauges. Atmospheric pressure is 0 PSIG Pounds per Square Inch Gauge PSIA is the abbreviation for another similar unit of pressure measurement and it stands for ___________________________________________ . Atmospheric pressure reading on a gauge, which displays in PSIA, is about 14.7 greater than the same pressure reading one pressure gauge which displays in PSIG. Pounds per Square Inch Absolute _____________________ means affinity for water, so _____________________ oils are oils with a high affinity for water. Hygroscopic __________________ is defined as the cleaning of refrigerant for reuse by oil separation and single or multiple passes through moisture absorption devices. Recycling ___________________ is defined as processing refrigerant to a level equal to new product specifications as determined by chemical analysis (testing to ARI-700 standards). Reclamation ___________________ is defined as transferring refrigerant in any condition from a system to a storage container without testing or purifying the refrigerant in any way. Recovery After completing the transfer of liquid refrigerant between the recovery unit and the refrigeration system, be careful to avoid trapping liquid refrigerant between service valves of the refrigerant hose because ___________________________________________________________________ . pressure can build up in the line and burst the hose When transporting cylinders containing used refrigerant, __________ requires __________ classification tags be attached. D.O.T. Refrigerant cylinders should be stored _______________ during shipping. vertically An accurate pressure reading of the refrigerant inside a recovery cylinder is necessary to determine if _________________________________________________________ are in the cylinder. excessive air or other non-condensable gases When a reclamation facility receives a tank of mixed refrigerant, ______________________________________________________________________________________________ , but typically a substantial fee is charged. it may refuse to process the refrigerant and return it at the owner's expense, or it may agree to destroy the refrigerant Recycling or recovery equipment using hermetric compressors has the potential to overheat when drawing deep vacuums because the compressor motor relies on ______________________________________ through the compressor for cooling. the flow or refrigerant When working with non-toxic refrigerants such as ___________________________________________ safety glasses and butyl-lined gloves should be used. R-134a, R-12, R-22 and R-500 The synthetic lubricant presently used with ternary blends is ________________________ . alkylbenzene A _____________ blend is a two-part mixture and a ______________ blend is a three-part mixture. binary, ternary _________________________________________ requires that all machinery rooms must activate an alarm and mechanical ventilation before refrigerant concentrations exceed the TLV-TWA (Threshold Limited Value - Time Weighted Average). ASHRAE Standard 15-1994 ____________ hoses between the unit and the recovery machine should not be used because they cause excessive pressure drop, increased recovery time and increased emissions. Long When servicing a small appliance for a leak repair, it is ________________________ to repair the leak but do so whenever possible. not mandatory A standard vacuum pump can only be used as a recovery device in combination with a __________________________________________ . non-pressurized container After installing and opening a piercing access valve,if the system pressure is _______ psig do not begin the recovery procedure because all the refrigerant has leaked out, and the air and moisture in the system would contaminate the recovery tank's refrigerant. 0 _______________________________________________________ are refrigerants used in some refrigerators built before 1950 and should not be recovered with current recovery hardware. sulfur dioxide, methyl chloride and methyl formate _________________________________ may be present in refrigerators used in small appliances in campers or other recreational vehicles and should not be recovered with current recovery devices. ammonia, hydrogen, and water Piercing-type valves are generally recommended for use only on _________________________________ tubing. copper and aluminum Before disposing of any appliance containing refrigerant, you must ________________ the refrigerant. recover When using a passive recovery device and the compressor does not function, both the ________________________________ should be accessed to assure all refrigerant is recovered. high and low side When filling a _________________________ , the refrigerant that is vented off the top of the cylinder must be recovered. charging cylinder During dehydration of a refrigeration system, the refrigeration system can be ________________ to decrease dehydration time. heated Do not inhale refrigerant vapors or mist in high concentrations because they can cause _______________________________________________ in some people. heart irregularities or unconscienceness Refrigerants are ________________ than air and can displace the air in a room, leaving no breathing air and leading to asphyxia. In most refrigerant accidents where death occurs, the major cause is oxygen deprivation. heavier Nitrogen gas is stored at ___________________________ ; always use a pressure regulator on the nitrogen cylinder. very high pressures A refrigerant leak detector should be used _____________ to check for leaks on a recovery device. daily Small amounts of refrigerant have no odor. When a pungent odor is detected during a sealed system recovery and/or repair, a ________________________________ has likely occurred. compressor burn-out At high temperatures (i.e., open flames, glowing metal surfaces, etc.0 _______ and _________ can decompose to form hydrochloric and hydrofluoric acids as well as phosgene gas. R-12, R-22 After recovering from a sealed system, if nitrogen is used to pressurize or blow debris out of the system, the nitrogen can be vented because _________________________________________________ . air is predominantly nitrogen Regulations, _________ , require the number of cylinders of each gas be recorded on the shipping paper for hazard class 2.2 nonflammable compressed gases. 49 CFR This section of the Clean Air Act prohibits individuals from knowingly venting ozone-depleting compounds used in refrigerant into the atmosphere. Section 608 Technicians releasing ______________________ quantities of refrigerant in the course of making good faith attempts to recapture and recycle or safely dispose of refrigerant are not subject to the prohibition. "de minimis" Refrigerants emitted in the course of normal operation of air conditioning and refrigeration equipment, as opposed to during the maintenance, servicing, repair, or disposal of this equipment, are ___________ subject to the prohibition. Thus, emissions due to leaks, which occur during normal operation of equipment, are permitted under the prohibition. NOT Mixtures of ____________________________ (and only __________________ mixtures) that are used as holding charges or as leak test gases are not subject to the prohibition because in these cases, the ozone-depleting compound is not used as a refrigerant. However, a technician may not avoid recovering refrigerant by adding nitrogen to a charged system! Before nitrogen is added, the mixture will be considered a refrigerant, and its release will be a violation of EPA regulation and subject to fine. Similarly, pure refrigerant released from any appliance, hardware, or device, is presumed to be a refrigerant, and their release will be a violation of EPA regulations and subject to fine. When changing refrigerant being used on a recovery or recycling device, the refrigerant in the recovery or recycling machine must be recovered (to the required evacuation level) and cannot be vented in the air! nitrogen and R-22, R-22-nitrogen Mixtures of nitrogen and any other refrigerant, except ______________ , are subject to the prohibition on venting. That means it is illegal to vent them into the atmosphere. HCFC-22 Since ___________________________ , HFCs and other refrigerants with a zero depletion factor (ODP) are also subject to the restriction on venting because they are "greenhouse gases," meaning they contribute to the global warming problem and must be recovered. November 15, 1995 Small releases of refrigerant that results from purging hoses or from connecting or disconnecting hoses to charge or service appliances will not be considered violations of the prohibition on venting. However, recovery and recycling equipment manufactured after November 15, 1993, must be equipped with __________________ fittings. low-loss All appliances (except small appliances) manufactured after this date must be equipped with a service aperture. November 15, 1993 On this date. Persons servicing MVAC-like appliances have the option of becoming certified as Section 608 Type 2 technicians instead of becoming certified as Section 609 MVAC technicians. Persons servicing MVACs do not have this choice, they must be certified as Section 609 MVAC technicians if they perform the AC service for compensation. January 29, 1998 On this date the EPA changed the classification of refrigerants into three classes, High, Medium and Low Pressure, instead of only High and Low Pressure. March 12, 2004 Recovery and Recycling devices can be EPA certified for _____________________ refrigerant (they do not need to be able to recover more than one refrigerant). a single Oils that will be used with most HFC-134a refrigerant applications are ________________________________ oils. ester-based synthetic (POE) Replacement of an __________________________________________________ is always considered Major Repairs. evaporator coil, condenser coil, or compressor A __________________________________ refrigerant blend, sometimes referred to simply as a blend refrigerant, has a range of boiling points or condensing points throughout the evaporator and condenser, respectively; the terms used to describe this are "temperature glide" or "gliding-temperature." non-azeotropic (or zeotropic) Reusable containers for refrigerants that are under high pressure (above 15 psig) at normal ambient temperature must be hydrostatically tested and date-stamped every ________________ . five years A refillable refrigerant cylinder must not be filled above ___________ of its full capacity. 80% There is no direct "drop-in" refrigerant for any ______ or ________ refrigerant. CFC, HCFC A leak in a high-pressure system will result in the system charge being reduced, and this will cause _______________________________ . excessive superheat As defined by ______________________________________ , a sensor and alarm are required for non-toxic refrigerants (such as R-11, R-12, R-22, and R-134a), to sense oxygen deprivation. ASHRAE Standard 15 Technicians receiving a passing grade on the Type 2 examination are certified to recover refrigerant during the maintenance, service, or repair of ______________________________________ pressure equipment. Very-High, High, Medium _________________________________ Appliance (definition unchanged by the EPA's March 12, 2004 rule change): An appliance that uses refrigerants with a critical temperature below 104 F or with a liquid phase saturation pressure above 355 psia at 104 F. This category includes but is not limited to appliances using R-13, R-23, R-503. Very-High-Pressure _____________________________________ Appliance (prior to March 12, 2004, referred to by the EPA as a higher-pressure appliance): An appliance that uses a refrigerant with a liquid phase saturation pressure between 170 psia and 355 psia at 104 F. This definition includes but is not limited to appliances using R-22, R-401B, R-402A/B, R-404A, R-407A/B/C, R-408, R-409, R-410A, R-411A/B, R-502 and R-507A. High-Pressure _______________________________________ Appliance (prior to March 12, 2004, referred to by the EPA as a high-pressure appliance): An appliance that uses a refrigerant with a liquid phase saturation pressure between 45 psia and 170 psia at 104 F. R-114 appliances are at the low-pressure end since the saturation pressure of R-114 at 104 F is slightly above 45 psia. This definition includes but is not limited to appliances using R-12, R-114, R-124, R-134a, R-401C, R-406A and R-500. Medium-Pressure Non-condensable gases in a refrigeration system result in a ___________________ discharge pressure. higher When evacuating a system, the use of _________________________ of a vacuum pump could cause trapped water to freeze. too large The system vacuum gauge should be connected _______________________________ from the vacuum pump. as far as possible Vacuum lines (hoses) should be _______________________________ than the pump intake connection. equal to or larger A system is not dehydrated until a vacuum gauge shows you have ________________________ the required finished vacuum with the system isolated from the vacuum pump. reached and HELD The system vacuum level is measured with the system ____________________ . isolated When pressurizing a refrigeration system with nitrogen, always use a ________________________ and never charge with ________________________ (only charge with nitrogen vapor). pressure regulator, liquid nitrogen When corrosion build-up is found within the body of a __________________ , the valve must be replaced, NOT repaired. relief valve When evacuating a vapor compression system, the vacuum pump should be capable of pulling a vacuum of _________________ . 500 microns Recovering refrigerant from a system in the ____________________ will minimize the loss of oil from the system. vapor phase Removal of the refrigerant charge from a system can be accomplished more quickly by ____________________ the recovery tank. cooling For the industrial process and commercial refrigeration sector, a 35% leakage rate or more (35% loss of charge/year) is defined as a ____________________________ , while for all other refrigeration systems with a charge of 50 pounds or more, a ________________________ is defined as a leakage rate of 15% (15% loss of charge/year). substantial leak Pressure relief valves must NEVER be ____________________________ , but are commonly installed in parallel. installed in series Substantial Leaks on systems that are normally charged with more than 50 pounds of refrigerant (after June 14, 1993) must be repaired within _________________ after discovery of the leak. 30 days Technicians servicing appliances that contain __________________________________ of refrigerant must provide the owner with an invoice that indicates the amount of refrigerant added to the appliance. Owners of appliances that contain _____________________________ of refrigerant must keep service records documenting the date and type of service, as well as the quantity of refrigerant added. 50 or more pounds If a large leak of refrigerant occurs, such as from a filled cylinder in an enclosed area, and no self-contained breathing apparatus is available, then the area should ___________________________ . be vacated and ventilated Technicians receiving a passing grade on the ________________ (low-pressure) appliance examination are certified to recover refrigerant during the maintenance, service, or repair of low-pressure equipment (CFC-11, HCFC-123). Only ______________ or Universal certified technicians could recover refrigerant from these units. TYPE 3 When leak testing a low-pressure centrifugal with nitrogen, the maximum test pressure is _____________ because pressure relief devices are typically set at 15 psig. 10 psig Because CFC-11 and HCFC-123 systems operate below atmospheric pressure, system leaks result in air and other contaminates leaking INTO (rather than out of) the system. A device that removes air and other non-condensable gases from the top of the condenser of a centrifugal refrigeration system during operation is called a ______________________ . purge unit Under EPA's regulations, __________________ can be used to pressurize a low-pressure system for the purpose of opening the system for a non-major repair. Use of __________________ to pressurize the system is also a suggested lea-test method. hot water Refrigerant is added to a centrifugal machine through the _________________________________ . evaporator-charging Water must be circulated through a ________________ during refrigerant evacuation to prevent freezing of the water in the evaporator heat exchanger. chiller When recharging an _________ system, the first step is to charge the unit with refrigerant vapor to avoid liquid evaporation and potential freezing problems. This is accomplished by charging the system with vapor until the refrigeration saturation temperature is above 32 F. To account for pressure-gauge accuracy errors, a saturation temperature of approximately 35 F is suggested. R-11 A ___________________________________ is used to determine if tubes in the evaporator or condenser are leaking. hydrostatic tube test When checking for leaks in the _______________________ or ___________________________________ , you can drain the water from the water box and place the refrigerant detector at one of the water box access fittings or drain plugs. evaporator, condenser of a chiller On a chiller that operates at pressures below ___________________________________ , such as R-11 chillers, leaks cause non-condensable gases to enter the system. This causes the purge unit to vent some refrigerant as it vents these non-condensables. fixing leaks will reduce refrigerant loss from the purge unit. atmospheric pressure According to ______________________________________________ if the pressure in a system rises from 1 millimeter of mercury (1 mm Hg) to a level above 2.5 mm Hg during a standing vacuum test, the unit should be checked for leaks. ASHRAE Guideline 3-1990 During ________________________________ from a chiller, it is best to recover the liquid first, before beginning vapor recovery, so as to minimize the evaporation of liquid refrigerant (which could freeze the water in the water boxes) refrigerant recovery During _________________________________ from a water chiller, the chiller's water pumps should be on to avoid freezing the water in the water boxes. (Evaporation of any remaining liquid refrigerant could cause stagnant water in the water box to freeze.) vapor recovery _____________________ oil before removing it reduces the amount of refrigerant trapped in the oil. heating A _______________________________ can meet EPA standards even if it only recovers one type of refrigerant. recovery device