FREE A2L Codes and Regulations Questions and Answers

Question 1

A technician is installing a new split system using R-32 in a residential bedroom.
According to UL Standard 60335-2-40, what is the primary factor used to determine the maximum allowable refrigerant charge size for that specific room?

Accepted Answer

The volume of the occupied space (room size)

Answer

The length of the refrigerant lineset

Answer

The SEER rating of the equipment

Answer

The outdoor ambient design temperature

Question 2

Under the EPA's SNAP Rule 23, what is a mandatory requirement for technicians servicing residential and light commercial air-conditioning systems containing A2L refrigerants?

Accepted Answer

Recovery and/or recycling equipment must be specifically certified for use with A2L refrigerants.

Answer

Technicians must attend a specialized 40-hour A2L training course.

Answer

A2L refrigerant is allowed to be vented if the total charge is less than 2 lbs.

Answer

Only master-level technicians are permitted to purchase A2L refrigerants.

Question 3

According to the International Mechanical Code (IMC), if refrigerant piping containing an A2L refrigerant penetrates two or more floors within a building, which of the following is required?

Accepted Answer

The piping must be enclosed in a fire-resistance-rated shaft.

Answer

A leak detector must be installed on each floor the pipe passes through.

Answer

The piping must be painted bright red for its entire length.

Answer

The system's total charge is limited to 5 lbs or less.

Question 4

A machinery room contains a chiller with a large charge of R-454B (an A2L refrigerant). ASHRAE Standard 15 requires an emergency ventilation system activated by a refrigerant detector. The minimum required airflow rate (Q) for this system is based on what specific formula?

Accepted Answer

Q = 100 x G^0.5 (where G is refrigerant mass in lbs)

Answer

Q = Room Volume (ft³) / 10

Answer

Q = 500 x G (where G is refrigerant mass in lbs)

Answer

Q = G² / Room Floor Area (ft²)

Question 5

Which organization is primarily responsible for developing and publishing the model building codes, such as the International Mechanical Code (IMC) and International Fire Code (IFC), which are widely adopted by state and local governments?

Accepted Answer

International Code Council (ICC)

Answer

Air-Conditioning, Heating, and Refrigeration Institute (AHRI)

Answer

Occupational Safety and Health Administration (OSHA)

Answer

Underwriters Laboratories (UL)

Question 6

A technician is inspecting the factory-applied labels on a new piece of equipment that uses an A2L refrigerant. In accordance with UL 60335-2-40, which specific marking is required to be present to warn of the flammability hazard?

Accepted Answer

A symbol showing a flame inside a yellow triangle.

Answer

A skull and crossbones symbol for toxicity.

Answer

The complete NFPA 704 diamond.

Answer

A red border around the entire nameplate.

A technician is installing a new split system using R-32 in a residential bedroom.According to UL Standard 60335-2-40, what is the primary factor used to determine the maximum allowable refrigerant charge size for that specific room?

A technician is installing a new split system using R-32 in a residential bedroom.
According to UL Standard 60335-2-40, what is the primary factor used to determine the maximum allowable refrigerant charge size for that specific room?