R-410A Refrigerant Certification

What is the primary safety concern when working with R-410A refrigerant?

• AHigh toxicity
• BExtreme flammability
• CHigh pressure
• DCorrosive properties

What color is the cylinder for R-410A refrigerant?

• AGreen
• BBlue
• CRose
• DYellow

Which type of lubricant is specified for use with R-410A?

• AMineral oil
• BPolyolester (POE) oil
• CAlkylbenzene oil
• DSilicone oil

Can R-410A be used as a drop-in replacement for R-22?

• AYes, with a new filter-drier.
• BYes, if the system is flushed first.
• CNo, R-410A systems have different components and operating pressures.
• DOnly in systems manufactured after 2010.

When charging an R-410A system, the refrigerant should be removed from the cylinder as a:

• ALiquid
• BVapor
• CMixture of liquid and vapor
• DGas at a specific temperature

What type of personal protective equipment (PPE) is required when handling R-410A?

• ASafety glasses and gloves
• BRespirator and face shield
• CHazmat suit
• DNone of the above

What is the primary difference between the service equipment used for R-410A and R-22?

• AThe color of the hoses
• BThe pressure rating of the equipment
• CThe type of fittings on the hoses
• DThe size of the recovery cylinder

A technician is checking the superheat on an R-410A system. The suction line pressure is 120 psig, and the suction line temperature is 50°F. What is the superheat?

• A5°F
• B10°F
• C15°F
• D20°F

How should R-410A cylinders be stored?

• AUpright and secured
• BOn their side
• CIn a warm, dry place
• DIn direct sunlight

What is the primary environmental benefit of using R-410A over R-22?

• ALower global warming potential (GWP)
• BZero ozone depletion potential (ODP)
• CHigher efficiency
• DLower toxicity

What type of metering device is commonly used in R-410A systems?

• ACapillary tube
• BThermostatic expansion valve (TXV)
• CAutomatic expansion valve (AXV)
• DFloat valve

A technician is checking the subcooling on an R-410A system. The liquid line pressure is 317 psig, and the liquid line temperature is 90°F. What is the subcooling?

• A5°F
• B10°F
• C15°F
• D20°F

What is the minimum evacuation level required for a deep vacuum on an R-410A system?

• A500 microns
• B1000 microns
• C1500 microns
• D2000 microns

What is the proper method for leak checking an R-410A system?

• APressurize the system with nitrogen and use an electronic leak detector.
• BPressurize the system with compressed air and use soap bubbles.
• CCharge the system with a small amount of R-410A and use a halide torch.
• DUse a dye that is compatible with POE oil.

What is the temperature glide of R-410A?

• A0°F
• B1°F
• C2°F
• D3°F

What is the primary hazard of venting R-410A into the atmosphere?

• AIt is a potent greenhouse gas.
• BIt is toxic.
• CIt is flammable.
• DIt is corrosive.

What is the purpose of a filter-drier in an R-410A system?

• ATo remove moisture and contaminants from the refrigerant.
• BTo increase the pressure of the refrigerant.
• CTo decrease the temperature of the refrigerant.
• DTo meter the flow of refrigerant.

A technician is servicing an R-410A system with a TXV. The superheat is too high. What is the most likely cause?

• AThe system is overcharged.
• BThe system is undercharged.
• CThe TXV is stuck open.
• DThe TXV is stuck closed.

What is the maximum pressure that an R-410A recovery cylinder should be filled to?

• A80% of its water capacity
• B90% of its water capacity
• C100% of its water capacity
• D110% of its water capacity

What is the name of the international treaty that regulates the production and consumption of ozone-depleting substances?

• AThe Kyoto Protocol
• BThe Paris Agreement
• CThe Montreal Protocol
• DThe Clean Air Act

What is the purpose of the accumulator in an R-410A system?

• ATo store liquid refrigerant to prevent it from entering the compressor.
• BTo store oil to ensure proper lubrication of the compressor.
• CTo increase the pressure of the refrigerant.
• DTo decrease the temperature of the refrigerant.

A technician is servicing an R-410A system with a fixed orifice metering device. The superheat is too low. What is the most likely cause?

• AThe system is overcharged.
• BThe system is undercharged.
• CThe metering device is restricted.
• DThe condenser coil is dirty.

What is the proper procedure for disposing of a disposable R-410A cylinder?

• ARecover any remaining refrigerant, render the cylinder useless, and recycle it.
• BVent the remaining refrigerant and throw the cylinder in the trash.
• CRefill the cylinder with another refrigerant.
• DUse the cylinder for storing compressed air.

What is the purpose of a recovery machine?

• ATo remove refrigerant from a system.
• BTo add refrigerant to a system.
• CTo clean refrigerant.
• DTo recycle refrigerant.

What is the pressure of R-410A at 70°F?

• A120 psig
• B150 psig
• C200 psig
• D250 psig

What should you do if you get liquid R-410A on your skin?

• AFlush the area with warm water.
• BApply a bandage.
• CSeek immediate medical attention.
• DAll of the above

What is the purpose of a sight glass in an R-410A system?

• ATo visually inspect the refrigerant for contaminants.
• BTo check the refrigerant charge.
• CTo measure the pressure of the refrigerant.
• DTo measure the temperature of the refrigerant.

A technician is servicing an R-410A system. The head pressure is too high. What is the most likely cause?

• AThe system is undercharged.
• BThe condenser coil is dirty.
• CThe metering device is restricted.
• DThe evaporator coil is dirty.

What is the proper way to transport a cylinder of R-410A in a vehicle?

• AIn the passenger seat
• BIn the trunk
• CSecured in an upright position in a well-ventilated area
• DLying down in the bed of a truck

What is the EPA's SNAP program?

• AA program that provides food assistance to low-income individuals and families.
• BA program that identifies and evaluates substitutes for ozone-depleting substances.
• CA program that regulates the disposal of hazardous waste.
• DA program that sets standards for drinking water quality.

What is the purpose of the compressor in an R-410A system?

• ATo pump refrigerant through the system.
• BTo remove heat from the refrigerant.
• CTo add heat to the refrigerant.
• DTo meter the flow of refrigerant.

A technician is servicing an R-410A system. The suction pressure is too low. What is the most likely cause?

• AThe system is overcharged.
• BThe system is undercharged.
• CThe metering device is restricted.
• DThe condenser coil is dirty.

What should you do if you see a large cloud of white vapor coming from an R-410A system?

• AEvacuate the area immediately.
• BTry to find the source of the leak.
• CCall the fire department.
• DAll of the above

What is the purpose of a vacuum pump?

• ATo remove refrigerant from a system.
• BTo add refrigerant to a system.
• CTo remove air and moisture from a system.
• DTo pressurize a system for leak checking.

What is the pressure of R-22 at 70°F?

• A100 psig
• B121 psig
• C150 psig
• D200 psig

What is the most important thing to remember when working with refrigerants?

• AAlways wear PPE.
• BNever vent refrigerant into the atmosphere.
• CUse the proper tools and equipment.
• DAll of the above