Question #2: When sending used refrigerants to be reclaimed, you must use disposable refrigerant cylinders. When transporting used refrigerants, only recovery cylinders can be used.
Why must containers designated refillable by DOT be used for transporting recovered pressurized refrigerants?
Why are containers designated “refillable” by DOT used for transporting recovered pressurized refrigerant? To meet safety requirements. When evacuating a system, the hoses should be: As short in length and as large in diameter as possible.
What should a technician do if they discover that some R 410a was added to an R 22 system?
If you discover that R-410a was added to this system, you need to recover the mixture in a separate recovery tank. u must use a separate recovery cylinder for the other refrigerant. At the end of recovery service, technicians need to make sure that there is no liquid refrigerant trapped in the service hose.
How should Disposable Cylinders of refrigerants be discarded?
How should disposable cylinders of CFCs, HCFCs, and HFCs be discarded? Bleed any remaining refrigerant to ambient air and put the cylinders into a trash dumpster. Recover all remaining refrigerant, render the cylinders useless and recycle the metal.
What happens if you mix refrigerants?
Mixing refrigerants can have an adverse effect on air conditioning and refrigeration systems, resulting in reduced efficiency, performance, and longevity. And it can create a safety hazard for the technician who may not know exactly what type of refrigerant a system may contain.
When filling a charging cylinder the refrigerant that is vented off the top of the cylinder?
When filling a charging cylinder with a regulated refrigerant; The refrigerant vapor that is vented off the top of the cylinder must be recovered. If after installing a fitting for the purpose of recovering the appliances refrigerant, you find that the system pressure is 0 psig; Recovery is not required.
Why can technicians only charge used CFC HCFC or HFC refrigerant back into the evacuated appliance or into another appliance owned by the same owner?
Answer: Technicians can only charge used CFC, HCFC, or HFC refrigerants back into the same appliance or into another appliance owned by the same owner. … To make it easier to recover refrigerant, EPA regulations require appliances that do not have service valves to have a service aperture or process stub.
Which hydrocarbon refrigerant is approved for retrofit into existing household refrigerators?
Propane is proposed to be listed for use in household refrigerators and freezers and combination refrigerator/freezers subject to a charge limit of 57g in each circuit.
When retrofitting a motor vehicle AC system with a new refrigerant The technician must?
When retrofitting any system with such a device to use a new refrigerant, the technician must also install a high-pressure shutoff switch. This switch will prevent the compressor from increasing the pressure to the point where the refrigerant is vented.
When disposing of an empty or near empty disposable cylinder you should?
Refillable cylinders must be UL or DOT approved and must be hydrostacally tested and date stamped every five years. Before disposing of an empty or near empty disposable cylinder, the remaining refrigerant MUST be recovered. Atach the cylinder to the recovery unit and remove any remaining refrigerant.
When external portable containers are used for transfer of recycled refrigerant?
7.1 When external portable containers are used for transfer, the container must be evacuated at least 27 in of vacuum (75 mm Hg absolute pressure) prior to transfer of the recycled refrigerant. External portable con- tainers must meet DOT and UL standards.
What should a technician do if the refrigerant in a recovery cylinder is contaminated?
What should a technician do if the refrigerant in a recovery cylinder is suspected to be contaminated? Turn refrigerant in for reclamation. Before beginning a refrigerant recovery procedure, it is ALWAYS necessary to; Know the type of refrigerant that is in the system.
Which of the following is an HFC refrigerant?
Common HFC refrigerants are R-32, R- 125, R134a, R-143a, and R-152a. A blend that contains different HFCs is considered an HFC refrigerant. ODP (Ozone Depletion Potential) and low GWP (Global Warming Potential) and so offer a more environmentally friendly alternative to CFCs, HCFCs and HFCs.
Which refrigerants must be recovered before opening?
Chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) have which of the following in common? They must be recovered before opening or disposing of appliances. After 1995, supplies of CFC refrigerant for equipment servicing will come from; recovery and recycling.
When an HFC system with POE oil has been opened for a major system repair what is the minimum evacuation level that should be achieved before charging the system?
After making a major repair, the appliance should be dehydrated by evacuating the system to a minimum of 500 microns. This minimum level is required for HFC refrigerants with POE oil or any other refrigerant system.
Which oil is used with most HFC refrigeration applications?
Polyolester (POE) – the primarily synthetic oil for refrigeration systems using HFC refrigerants.
Which refrigerant can be purchased by someone who is not a section 608 certified technician?
The sales restriction is established by EPA regulations (40 CFR Part 82, Subpart F) under Section 608 of the Clean Air Act. Only EPA-certified technicians are allowed to purchase ozone-depleting substances (ODS) or non-ozone depleting substitutes used as refrigerants, with limited exceptions.
What is meant by evacuating the system?
Evacuation — The removal of water vapor and air from the system.
When installing any type of access fitting onto a sealed system?
When installing any type of access fitting onto a sealed system; the fitting should be leak tested before proceeding with recovery. Any person who opens an appliance for maintenance service or repair must have at least one self-contained recovery machine available at their place of business.
How is the pressure of a refrigerant cylinder containing saturated refrigerant determined?
The pressure of a refrigerant cylinder containing saturated refrigerant: Is determined entirely by the temperature of the refrigerant. The pressure of a saturated refrigerant can accurately be predicted: By comparing its temperature to the corresponding pressure on a pressure-temperature chart.
Can you mix R134a with R1234yf?
If you were to put R1234yf in a system designed for R134a, it looks like you’d end up with about a 10% loss of cooling capacity, but putting R134a into a R1234yf system would be a wash. It appears R1234yf oil is compatible with R134a (but not vice-versa), so shouldn’t be a problem there.
What refrigerant is compatible with R134a?
There are three refrigerants that can be used to replace R-134a: R-1234yf, R-152a and R-744.
What happens if you put the wrong refrigerant in your car?
You cannot mix refrigerant types, and putting the wrong refrigerant in your car will cause damage to the air conditioning system! If you’re not sure which kind of refrigerant your vehicle takes, DIY A/C charging may not be for you.