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EPA 608 TYPE 3 EXAM|| 2024-2025 QUESTIONS AND 100% CORRECT ANSWERS ALREADY GRADED A+|| LA, Exams of Nursing

EPA 608 TYPE 3 EXAM|| 2024-2025 QUESTIONS AND 100% CORRECT ANSWERS ALREADY GRADED A+|| LATEST AND FULLY COVERED VERSION 2025 WITH EXPERT VERIFIED SOLUTIONS|| ASSURED PASS!!!

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Download EPA 608 TYPE 3 EXAM|| 2024-2025 QUESTIONS AND 100% CORRECT ANSWERS ALREADY GRADED A+|| LA and more Exams Nursing in PDF only on Docsity!

EPA 608 TYPE 3 EXAM|| 2024-2025 QUESTIONS AND 100% CORRECT ANSWERS ALREADY GRADED A+|| LATEST AND FULLY COVERED VERSION 2025 WITH EXPERT VERIFIED SOLUTIONS|| ASSURED PASS!!! On low pressure chillers, moisture typically enters the refrigerant system through air leaks from areas with gaskets or fittings The maximum test pressure for leak testing a low pressure centrifugal is: 10 psig Leak test and repair the chiller to reduce refrigerant loss from a pruge unit on CFC11 chiller ... A hydrostatic tube test kit is used to: determine if a tube leaks Commercial and industrial process refrigeration systems must be repaired when the leak rate exceeds of the charge per year. 35% Refrigerant recovery typically start, with liquid recovery it is faster.

A rupture disc on a recovery vessel for a low pressure refrigerants relieves at: 15 psig According to ASHRAE Guideline 3-1996, if the pressure in a system rises from 1 mm Hg to a level above during a standing vacuum test, the system should be checked for leaks. 2.5 mm Hg The primary water source for a recovery unit condensing coil is. local municipal water supply When recharging a refrigeration system with R-11, what vaporpressure is necessary in the shells before changing with liquid? 16.9" Hg vacuum After recovering the liquid refrigerant you must: recover the vapor refrigerant

According to the EPA there is approximately refrigerant vapor left in an average 350 ton R-11 chiller at 0 psig pressure once all the R-11 liquid has been removed. 100 pounds Charging refrigerant liquid into a refrigeration system when it is under a 29 inch Hg vacuum can cause the: system water to freeze A system does not have to be evacuated all the way to the required level when: leaks in the appliance make evacuation to the prescribed level unattainable Which of the following repairs would ALWAYS be considered "major" under EPA's replacement of evaporator coil Under EPA's regulation's is used to pressurize a low pressure chiller for the purpose of opening the system for a non-major repair? warming the refrigerant If you are using a recovery machine manufactured AFTER 11- 15 - 93 you must evacuate an low pressure appliance to before making a major repair. 25 mm of Hg absolute

After reaching the required recovery vacuum on a chiller, you should Wait for at least a few minutes to see if the system pressure rises, indicating that there is till refrigerant in a liquid form or in the oil The pressure corresponding to 32 F for R- 123 20 inches of HG vacuum When evacuating a system, the use of too large a vacuum pump can cause? trapped water to freeze Refrigerant-11 at a pressure of 17 inches HG vacuum has a saturation temperature of: 35F During the evacuation of a system containing large amounts of moisture you can prevent freezing of this moisture by increasing the pressure with gas Nitrogen

ASHRAE standard 15-1994 requires that each machinery room must activate an alarm and mechanical ventilation beofre refrigerant concentrations exceed: the threshold limit valve and time weighted average The typical design burst pressure for a rupture disk on a low pressure centrifugal air-conditioning system is set at 15 psi Heat pumps that have been retrofitted from R22 to R407C should be leak checked with: pressurized nitrogen When a new system has been assembled, the first thing to do is: pressurize the system with inert gas and leak check EPA regulations require that leaking commercial or industrial process refrigeration equipment must be repaired when the leak rate exceeds of the charge per year. 35%

Prior to replacing the condenser coil in a high pressure system, the refrigerant was recovered and stored in a refillable container. The refrigerant: can probably be charged back into the system R-410A requires recovery tanks rated for at least: 400 psig to recover liquid refrigerant you must connect one hose to the liquid line The primary water source for cooling the condenser of a water-cooled recovery unit is: local municipal water supply After refrigerant liquid has been recovered from a system, any remaining vapor is: condensed by the recovery system With an air-cooled condenser on the roof of a building and the evaporator on the first floor, recovery should first occur: from the liquid line entering the evaporator the recovery of refrigerant from a system as a vapor only will minimize the loss of: oil

When using recovery or recycling equipment that was made after 11- 15 - 93 you must evacute a system containing MORE than 200 pounds of CFC-12 to before making a major repair. 15 inches of HG vacuum When using recovery or recycling equipment that was made BEFORE 11- 15 - 93 technicians must evacuate a unit that has a normal charge of 10 pounds of CFC- 500 to before disposing of the system. 4 inches of HG vacuum To change the compressor on a system cantaining 40 pounds R-500 using a recycling machine that was manufactured AFTER 11- 15 - 93 you must isolate the compressor then: evacuate the isolated section of the system to 10 inches of vacuum and hold. If the system pressure does not rise, remove the compressor. Recycling and recovery equipment maufactured after 11- 15 - 93 does not need an oil separator ... A system can be evacuated to only atmospheric pressure when: leaks in the appliance make the evacuation to the prescribed level unattainable To change the compressor on a system containing R-410A, you must isolate the compressor then: Evacuate the isolated section of the system to atmospheric pressure and hold. If system pressure does not rise, remove the compressor. System- dependent recovery equipment CANNOT be used when: the appliance contains over 15 pounds of refrigerant Moisture is removed a system by: using a filter drier

When a unit is opened for servicing the should always be replaced filter drier The backseating of a suction shutoff valvee will close the: guage port When charging an R-12 refrigeration system that uses a water cooled condensor, you must first charge with vapor to a pressure of at least , before switching to a liquid charging. 35 psig A compressor heater is used to: reduce the amount of refrigerant in the lubricating oil While R-410A is a high pressure refrigerant, it can be stored in the back of your service van as long as: the temperature inside the vehicle does not exceed 125 degrees F. This is the same guidance given for R-22 and other common refrigerants. For what refrigerant is an equipment room refrigerant monitor required under ASHRAE standard 15? R- 123 A reciprocating compressor should not be energized if the discharge service valve has closed What factor affects the speed of evacuation? the size of the equipment the ambient temperature the amount of moisture in the system The evacuation of a system is a method of: dehydration When moisrture exists in an operating system which is likely to occur? Acid will form

The over-evacuation of a system: does not occur A system is considered dehydrated when: the vacuum indicator shows you have reached & held the required finished vacuum When evacuating a system the hoses should be: equal to or larger than the vacuum pump inlet connection When evacuating a system the hoses should be: short in length & as large in diameter as possible When operating refrigerant recovery or recycling equipment the following precautions should be taken safety glasses & gloves along with following equipment safety precautions The color code for refrigerant recovery cylinders is yellow tops with grey bodies Never use oxygen or compressed air to pressurize a sytem because: when mixed with compresser oil or some refrigerants it could explode When using any solvent, chemical, cleaner, chemical or refrigerant you should review MSDS (data sheets) Refrigerant vapors or mist should not be inhaled because they may cause heart irregularities & or unconsciousness When using recovery unit the fill level of the recovery tank can be controlled by mechanical float switch electronic shutt-off device weight what type of refrigerant is clorine free HFC's HCFC

R-22 R-123 R- 124

it is necessary to place a refrigerant label on: a frigerant cylinder that is being returned for reclaiming DOT requires youdo this when transporting cylinders attach DOT classification tags It is illegal to knowingly release refrigerant during the service, maintenance, repair or disposal of appliances with the exception of de minimis releases The type of oil that is most commonly used in stationary refrigertion applications with HFC-134a refrigerant is: ester oil The high pressure guage on service manifold sets has a contiuous scale, usall calibrated to read from: 0 - 500 psi. When a systemwill not hold a vacuum after it has been evauated, then: the system may be leaking

Long hoses between the unit & the recovery machine should not be used because they cause: excessive pressure drop increased recovery time increased emissions According to ASHRAE's 1992 refrigerant safety classification, which designations is the most safe A- 1 You can determine a safe pressure for leak testing a system from the: low side testpressure data-plate valve A cyclinder with a grey body and yellow top is designed to hold: recovered refrigerant Which refrigerant has the highest ozone depletion potential CFC's R-134a is a HFC refrigerant In genreal blended refrigerants should be charged: as a liquid refrigerant that enters the compressor, under normal operating conditiona is a: low pressure vapor refers to the process of cleaning refrigerant by oil seperation 7 single or multiple passes through filter driers which reduce moisture and acidity? Recycling When a system will not hold a vacuum after it has been evacuated then: the system may be leaking When dealing with small systems, how many refrigerants may be recovered into the same cylinder? one To obtain accurate vacuum readings during system evacuation, the system vacuum guage should be located:

as far from the vacuum pump as possible When evacuating a system, the hoses should be: equal to or larger than the vacuum pump inlet connection A system is dehydrated to: remove water & water vapor Measuring the system's final vacuum is always done with the system isolated & the vacuum pump off When using nitrogen to pressurize a system you should: only charge with nitrogen vapor Use to remove ice from a sight glass alcohol spray After refrigerant liquid transfer between recovery unit & the system being emptied ou need to avoid trapping: liquid refrigerant between service valves Which refrigerant will not damage the stratospheric zone HFC's Systems charged with R410A should be leaked checked with? pressurized nitrogen is the process of removing refrigerant in any condition from storing it in an external container without necessary testing or processing it in any way Recovering Which gas causes the least damage to the enviroment during a leak check? dry nitrogen A system is dehydrated to: remove water and water vapor Disposable refrigerant containers are used for refrigerent Virgin

Reusable refrigerant containers that are normally under pressure above 15 psig, must be hydrostatically tested and date stamped every: 5 years When using nitrogen to pressurize a system, you should always: Charge through a pressure regulator Whenever dry nitrogen from a portable cyclinder is connected to a system, what item is of most importance to consider for safety? there is a relief valve in the downstream line from the pressure regulator Which refrigerant will not damage the stratospheric ozone HFC A ternary refrigerant blend is a part mixture 3 Refrigerant leaves the condenser of an operating system as a: high pressure liquid Refrigerant that has been recovered can be returned to: the same system or other systems owned by the same person without restriction When dehydrating a system, the system can be heated to: decrease the dehydrating time Non-Azeotropic refrigerants leak from a system in uneven amounts due to different vapor pressures Reclaim is the process that returns refrigerant to the new- product specifications and that requires chemical analysis. Recovery equipemnt used for the service or repair of small appliances must be certified by an EPA approved lab if the recovery equipment was made after November 15, 1993 Recovery devices made before 11- 15 - 93 and are used for recovery of refrigerant from small appliances must be capable of: recovering 80% of the refrigerant whether or not the compressor is operating or achieving a 4 inch

vacuum under conditions of ARI 740-1993 EPA's definition of a small appliance includes: a device manufactored, charges & hermeticly sealed in factory with a charge of 5lbs or less Tech's with a type 1 small appliance certification are certified to recover refrigerant during the maintenance or repair of: PTAC's with 5lbs or less of refrigerant EPA requires that all small appliances be equipped with a service aperture or other device that is used when adding or removing refrigerant from the appliance. For small appliances this service port typically a straight piece of tubing, called a process tube that is entered using a piercing valve The EPA section 608 certification must be renewed every never It is an EPS regulation that any person who opens and appliance for maintenance, service or repair must have at least one self-contained recovery machine avalible at their place of buisiness. The only exception to this rule are persons working on small appliances The sale od CFC & HCFC refrigerants is: restricted to techs who are EPA certified in refrigerant recovery Anyone who recovers refrigeration during maintenance, service or repair of small appliances must be certified as either a universal Tech or a: Type 1 tech When recovering refrigerant from a household refrigerator who's compressor does not run, it is recommended that a low and high side access valves be installed because: it can help speed of recovery and required recovery effiency If you install an access fitting into a sealed system:

the fitting should be leak tested before proceeding with recovery Before beginning a refrigerant recovery procedure it is alway necessary to: determine the type of refrigerant in the system when recovering refrigerant into a non-pressurized container from a refrigerator with an improper compressor: it is necessary to heat & strike the compressor with a rubber mallet When checking for the existence of noncondensable gases inside a recovery cyclinder, why is it proper procedure to allow the temperature of the cyclinder to stabilize @ room temperature before taking a pressure reading? any comparisons to a pressure-temperature chart is only valid if both the pressure & temperature of the refrigerant are stable A recovery cyclinder which is 1/2 full of recovered R-410A @ 90*F, in the absence of non-condensables will be presurized to: 300 psig. When using , it is essential to take extra measures (heating/striking), to help release trapped refrigerant from the compressor oil. passive system-dependdent recovery devices on a small appliance with a non- operating compressor. According to the EPA which recovery equipment maintenance practice(s) should be preformed on a regular basis? check recovery device for refrigerant leaks On a small appliance with an operating compressor that has a completely plugged capillary tube, what is the minimum number of access valves that are needed to evacuate the refrigerant 1 valve on the high side Which refrigerant is most commonly used as a replacement for R-12 in new household refrigerators

R-134a Small amounts of refrigerant have no odor, therefor a pungent odor is detected during a system recovery &/or repair: a compressor burn-out has likely occurred If R-22 or R-12are exposed to high temperatures, these refrigerants can decompose to form: hydrochloric & hydroflouric acids Large spills of refrigerant can cause suffocation because: they are heavier than air & displace oxygen In the event of a large release of R-12 or R-22 in a contained area you should wear a "SCBA" or leave the area is required If a large leak of refrigerant occurs in an enclosed area 7 no self-contained breathing apparatus is available then you should Vacate & ventilate the spill area Portable refillable tanks or containers used to ship recovered refrigerants must meet what standards DOT Recovery or recycling equipment whaich was manufactured after 11- 15 - 93 and is used to recover refrigerant from small appliances prior to the disposal of the small appliance must be used: recover 80% of the refrigerant if the compressor isn;t working and 90% on one with a working compressor EPA regulations require the capture of at least 80% of the refrigerant from a small appliance with an non operating compressor is the tech is using: either type of recovery unit

A standard vacuum pump designed for evacuation & dehydration can: be only used as a recovery device in combination with a non pressurized container If you are recovering refrigerant from a frost free refrigirator you should: turn on the defrost heater to vaporize any trapped liquid Solderless piercing valves should not remain installed on refrigeration systems after completion of repairs because: they can leak over time A refrigerant that can be used as a direct service drop in subsitute for R-12 in a small appliance is: NONE When connecting your service manifold to check your system pressures it is always a good idea to: use equipment such as hand valves or seld sealing hoses to minimize release A recovery cylinder which is 1/2 full of recovered R-22 at normal room temperature about 75, in the absence of non-condensables, will be pressurized to: 75 psig A passive system-dependent recovery device for small appliances: captures refrigerant in a non-pressurized container When transporting refrigerants, the DOT regulation number 49 CFR requires to be recorded on the shipping papers for hazard class 2.2 nonflammable compressed gasses number of cylinders of each type of gas