EPA Administrator Scott Pruitt has now signed the document allowing isobutane, propane and R441A to be used in new household refrigerators, freezers, and combination refrigerators and freezers under the USA’s Significant New Alternatives Policy (SNAP) programme. Show
Which refrigerant is used in household refrigerators?Modern refrigerators usually use a refrigerant called HFC-134a (1,1,1,2-Tetrafluoroethane), which does not deplete the ozone layer, instead of Freon. Which hydrogen refrigerant is approved for retrofit into existing household refrigerators?HFC-134a is the primary refrigerant currently used to retrofit CFC-12 systems. Which refrigerant does not need to be recovered? It is not mandatory to repair the leak on small appliances, but it is recommended to do so whenever possible. Co2 refrigerant R-744 (Carbon dioxide) is a very high-pressure refrigerant and generally does not need to be recovered. Why ammonia is not used in domestic refrigerator? That noise is the sound of high-pressure liquid refrigerant flowing through the expansion valve. Pure ammonia gas is highly toxic to people and would pose a threat if the refrigerator were to leak, so all home refrigerators don’t use pure ammonia. What should be done before transferring refrigerant to an empty cylinder?What should be done before transferring refrigerant to an empty cylinder? The cylinder should be evacuated to avoid mixing air with the recovered refrigerant. Definition Technicians maintaining, servicing, repairing or disposing of high pressure or very high-pressure appliances. What may be done to speed the recovery process?What may be done to speed the recovery process and ensure that all CFC, HCFC, or HFC refrigerant has been removed from a frost-free refrigerator? Turn on the defrost heater to increase the refrigerant’s temperature and vaporize any liquid. What is an approved refrigerant for new household freezers?Hydrocarbon (HC) refrigerants were introduced as potential replacements. These refrigerant grade hydrocarbons namely propane (R 290) and isobutane (R 600a) were on sale at premium prices. Subsequently, question is, what is an approved refrigerant for new household refrigerators freezers and combination refrigerator freezers? Which is hydrocarbon refrigerant is approved for retrofit? Which hydrocarbon refrigerant is approved for retrofit into existing household refrigerator? The current use of hydrochlorofluorocarbons (HCFCs) and hydrofluorocarbons (HFCs) as refrigerants will be phaseout and phasedown. Hydrocarbon (HC) refrigerants were introduced as potential replacements. When does the new refrigerant go into use? The EPA has approved the refrigerant for use in light commercial and residential applications for new equipment. This is why the major brands are already planning for new equipment in the future to use the “new-new” refrigerant on January 1 st, 2023 (which is the date the 2022 California Energy Code begins.) How are refrigerants used in a home system?Its versatility allows it to work in home systems ranging from small under-the-counter refrigerators to family-sized refrigeration/freezer systems with multiple cooling compartments. Regulations on the long-term use of refrigerants vary by region and application, and may change over time.
D. Hydrocarbons are not approved for retrofit applications
Equipment which is used to recover CFC,HCFC,and HFC refrigerant from small appliances for the purposeof disposal must meet what standard?A. Recover 95% or the refrigerant whether or not the compressor is operative.B. Recover 80% of the refrigerant with an inoperative compressor and 90% of the refrigerant with anoperative compressor.e. Recover 90% of the refrigerant with an inoperative compressor and 80% of the refrigerant with anoperative compressor.D. Recover 75% of the refrigerant within 5 minutes.
B. Recover 80% of the refrigerant with an inoperative compressor and 90% of the refrigerant with anoperative compressor.
Which of the following best describes low loss fittings, on refrigerant recovery devices used to recoverCFCs,HCFCs,and HFCs?A. They can be either manually closed or automatically closed when disconnected to prevent loss ofrefrigerant from hoses.B. They are used to connect the recovery device to an appliance and leak only small amounts ofrefrigerant during use.e. They are used to connect the recovery device to an appliance and must be discarded after each use.D. They eliminate oil loss during recovery
A. They can be either manually closed or automatically closed when disconnected to prevent loss ofrefrigerant from hoses.
What type of certification is required for persons recovering CFCs,HCFCs,or HFCs during maintenance,service, or repair of small appliances?A. Type II TechnicianB. Type III Techniciane. Type I Technician or Universal TechnicianD. Technician who has passed the core exam
e. Type I Technician or Universal Technician
For which of the following refrigeration systems/appliances would it be permissible to use a passiverecovery device for recovery of CFCs, HCFCs,and HFCs?A. A centrifugal air conditionerB. A reciprocating liquid chillere. A single compressor, large commercial walk-in freezerD. A domestic refrigerator
D. A domestic refrigerator
What is the maximum normal charge of HCFC or HFC refrigerant in an appliance that is allowed to usesystem dependent recovery equipment? ~A. 5 poundsB. 10 poundse. 15 poundsD. 50 pounds
What is the maximum allowable factory charge of refrigerant for Type I appliances using CFCs,HCFCs,orHFCs?A. 3 poundsB. 5 poundsC. 10 poundsD. 15 pounds (adsbygoogle = window.adsbygoogle || []).push({});
Any person who opens an appliance containing a CFC,HCFC,or HFC for maintenance, service or repairmust have at least one self-contained recovery machine available for use. The exception to this rule arepersons working on:A. small appliances.B. low-pressure appliances.C. high-pressure appliances.D. very high-pressure appliances.
New household refrigerators may be factory charged with any of the following refrigerants, EXCEPT;A. R-290B. R-450AC. R-600aD. R-404A
Which of the following refrigerants is very high pressure and generally does NOT need to be recovered?A. R-22B. R-134aC. R-404AD. R-744
What is the approximate pressure of a storage cylinder of recovered R-404A that does not contain anynon-condensable impurities and is stored in a room where the temperature is 80°F?A. 68 psigB. 72 psigC. 174psigD. 288 psig
Which condition can cause excessive pressure on the high side of a self-contained (active) recoverydevice?A. When the thermal expansion valve is stuck open.B. When the capacity of the recovery tank is larger than the charge size of the system.C. When there is a large volume of non-condensable gas in the refrigerant being recovered.D. When the system is set for no subcooling.
C. When there is a large volume of non-condensable gas in the refrigerant being recovered
Which of the following is an acceptable method or device presently used for monitoring the 80% fill levelt1in a recovery tank?A. Superheat when a capillary tube is present or sub-cooling when a thermostatic expansion valve isused.B. Refrigerant scale or tank internal float device.C. Refrigerant temperature measurement.D. Refrigerant pressure measurement.
B. Refrigerant scale or tank internal float device.
After installing and opening a piercing access valve, the recovery procedure cannot begin ifthe system isat what pressure?A. 75 psigB. 50 psigC. 30 psigD. 0 psig
Which of the following is a true statement regarding a refrigerant that can be used as a direct service'drop-in' substitute for R-22?A. R-134a used with a TEVB. R-41OA used with a TEV that has a MOP of 75psig.C. R-290 with a fixed orifice metering device.D. There is no such thing as a "drop-in" substitute. (adsbygoogle = window.adsbygoogle || []).push({});
D. There is no such thing as a "drop-in" substitute.
Before beginning a refrigerant recovery procedure, it is ALWAYS necessary to;A. allow the appliance to stabilize at room temperature.B. know the type of refrigerant that is in the system.C. remove the appliance to an outdoor location.D. disconnect the appliance from its power source
B. know the type of refrigerant that is in the system
Which condition requires accessing both the high and low side of the system for refrigerant recoverywhen using the system-dependent (passive) recovery process?A. When there is a leak in the system.B. When the compressor operates normally.C. When the compressor only runs at half speed.D. When the compressor does not run.
D. When the compressor does not run
Which recovery equipment maintenance practice should be performed on a regular basis?A. Check vacuum pump for any leaks.B. Check recovery device for refrigerant leaks.C. Check amperage draw of recovery device.D. Check amperage draw of vacuum pump.
B. Check recovery device for refrigerant leaks.
When a pungent odor is detected during a sealed system recovery and/or repair which of the following ismost likely?A. The refrigerant should not be recovered.B. A compressor burnout has occurred.C. It is the characteristic smell of the refrigerant.D. The refrigerant should be vented.
B. A compressor burnout has occurred.
After recovering refrigerant from a sealed system, if nitrogen is used to pressurize or blow debris out ofthe system, the nitrogen;A. must be recovered. €:B. may be vented to the ambient air.C. should be returned to the cylinder.D. should only be used if mixed with R-22
B. may be vented to the ambient air
Which refrigerants can be mixed in an appliance?A. R-22 and R-407CB. R-12 and R-134aC. R-407C and R-410AD. Refrigerants cannot be mixed (adsbygoogle = window.adsbygoogle || []).push({});
D. Refrigerants cannot be mixed
What acids can CFC and HCFC refrigerants decompose into at high temperatures (e.g. open flames,glowing metal surfaces, etc.)?A. Boric and chromic acidsB. Sulfuric and phosphoric acidsC. Hydrochloric and hydrofluoric acidsD. Phosphoric and dodecylbenzenesulfonic acid
C. Hydrochloric and hydrofluoric acids
What gases can CFC and HCFC refrigerants decompose into at high temperatures, (e.g., open flames,glowing metal surfaces, etc.)?A. Hydrazine gasB. Phosgene gasC. Helium gasD. Tetraethyl gas
A very large refrigerant leak can cause suffocation because refrigerants;A. smell strong and make breathing difficult.B. are lighter than air and cause dizziness.C. are heavier than air and displace oxygen.D. sting the nose and cause sneezing.
C. are heavier than air and displace oxygen
Permanent safety markings are NOT required on which of the following areas on household refrigeratorsusing HC refrigerants?A. On or near any evaporators and near any exposed refrigerant tubing.B. Near the machine compartment.C. On the inside ofthe refrigerator door.D. On the exterior of the refrigerator.
C. On the inside of the refrigerator door. |
What is an approved refrigerant for new household refrigerators freezers and combination refrigerator freezers?
Postagens relacionadas
direito autoral © 2024 estudarpara Inc.
