A2L Refrigerant

The minimum concentration of a refrigerant that can propagate a flame through a consistent mixture of the refrigerant and air is known as the;

• acute toxicity exposure limit (ATEL)

• immediately dangerous to life or health concentration (IDLH)

• lower flammability limit (LFL)

• upper explosive limit (UEL)

Refrigerant cylinders should be transported in the upright position to ensure;

• easier access in the event of an accident.

• the cylinder label is visible during a DOT inspection.

• the pressure relief valve is in contact with the vapor space of the cylinder.

• the refrigerant vapor will condense to a liquid at the bottom of the tank.

Tools used during the installation or service of systems charged with a flammable refrigerant must be;

• flushed with liquid refrigerant before and after use.

• listed as “approved for use” in the manufacturer’s installation manual.

• pressure tested with the refrigerant to be used to ensure compatibility.

• rated for use with flammable refrigerants.

The first stage of the evacuation process which removes non-condensables from a system is called;

• degassing.

• dehydration.

• recovery.

• recycling.

Once a flammable refrigerant has been recovered and stored in a recovery cylinder;

• it can be taken a safe distance from the jobsite and vented to the atmosphere.

• it must be placed a safe distance away from the work area before a system repair or installation is started.

• it must be placed in ice to ensure it stays below the refrigerant’s ignition temperature.

• it should be returned to a reclamation facility prior to beginning the installation of new equipment.

In a vapor-compression refrigeration circuit, the term non-condensable is used to describe;

• a refrigerant oil that will not vaporize in the compressor.

• any gas that will not condense to a liquid.

• any liquid that will not condense to gas.

• any refrigerant that will not mix with the system oil.

Which of the following can affect the speed and efficiency of an evacuation?

• The capacity of the vacuum pump and hoses being used.

• The fin spacing (fins per inch or FPI) on the condenser and evaporator coils.

• The location of the electrical disconnect and the supply voltage to the system.

• The type of refrigerant and oil inside of the system.

Which of the following refrigerants is exempt from the EPA’s recovery mandate?

• R-32

• R-290

• R-454B

• R-1234yf

Which one of the following refrigerants is classified as an A3 refrigerant?

• R-32

• R-290

• R-717

• R-1234yf

Atmospheric pressure (0 psig) is equal to approximately;

• 25 inches of mercury.

• 500 microns.

• 760,000 inches of mercury.

• 760,000 microns.