FREE A2L Specific Service Procedures Questions and Answers

Question 1

What is a mandatory requirement for refrigerant recovery machines and vacuum pumps used with A2L refrigerants?

Accepted Answer

They must be certified for use with flammable refrigerants (e.g., spark-proof).

Answer

They must be less than 5 years old.

Answer

They must have a digital micron gauge built-in.

Answer

They must be painted red or yellow for identification.

Question 2

Before brazing a component on a system that contained an A2L refrigerant, what step is essential after recovery?

Accepted Answer

Purge the system with an inert gas like nitrogen.

Answer

Pressurize the system with compressed air.

Answer

Wash the lines with a system flushing agent.

Answer

Pull a vacuum to 500 microns.

Question 3

When charging a new A2L system, why is it required to charge with liquid refrigerant?

Accepted Answer

To ensure accurate charging and prevent flammable vapor in the cylinder.

Answer

To prevent the service hoses from freezing.

Answer

Because vapor charging is too slow.

Answer

To allow the compressor to run during charging.

Question 4

After pulling a deep vacuum on an A2L system, what is the primary safety reason for breaking the vacuum with dry nitrogen?

Accepted Answer

To prevent atmospheric air and moisture from entering the system.

Answer

To cool down the compressor oil.

Answer

To clean any debris from the refrigerant lines.

Answer

To test the accuracy of the pressure gauges.

Question 5

What is a general requirement for electronic tools, such as leak detectors or scales, when used in an area where A2L refrigerant is being serviced?

Accepted Answer

They must be intrinsically safe or rated for flammable atmospheres.

Answer

They must be battery-powered only.

Answer

They must be UL listed for general use.

Answer

They must have a minimum 10-foot power cord.

Question 6

What should be done with service hoses immediately after charging an A2L system and closing the service valves, but before disconnecting the hoses?

Accepted Answer

Recover the refrigerant from the hoses or use low-loss fittings.

Answer

Quickly disconnect them to create a seal.

Answer

Vent the hoses to the atmosphere.

Answer

Flush the hoses with nitrogen while they are still connected.