FREE ESCO A2L Leak Detection, Charging & Recovery Procedures Questions and Answers

Question 1

Which tool is recommended for detecting small leaks of A2L refrigerant in a tight system?

Accepted Answer

Electronic leak detector rated for A2L refrigerants

Answer

Spray bottle with soap solution

Answer

Halide torch leak detector

Answer

Ultraviolet dye only

Question 2

Before opening a system containing A2L refrigerant for service, what minimum ventilation action should be taken?

Accepted Answer

Ensure mechanical ventilation provides at least 4 air changes per hour

Answer

Seal the area to prevent drafts

Answer

Shut off all ventilation to keep refrigerant contained

Answer

Use fans to blow air toward an open‑flame heater

Question 3

When charging an A2L system in the field, the recommended method is to charge:

Accepted Answer

Vapor into the low side while the system is running

Answer

Liquid into the high side while the system is off

Answer

Liquid directly into the compressor crankcase

Answer

Liquid into the low side with the system off

Question 4

Which personal protective equipment (PPE) is required when recovering A2L refrigerant?

Accepted Answer

Flame‑resistant gloves, safety glasses, and insulated gloves

Answer

None, A2L has low toxicity

Answer

Welding helmet

Answer

Splash apron only

Question 5

According to ASHRAE Standard 15, what is the maximum allowable leak concentration for A2L refrigerants in an occupied space?

Accepted Answer

25% of the lower flammability limit (LFL)

Answer

50% of the LFL

Answer

75% of the LFL

Answer

100% of the LFL

Question 6

Why must recovery cylinders be specifically rated for A2L refrigerants?

Accepted Answer

They include pressure‑relief devices suitable for flammable gases

Answer

They have thicker walls for extremely high pressure

Answer

Any R‑410A cylinder is acceptable

Answer

They are lighter and easier to transport

Question 7

Which statement about recovering mixed refrigerants that include A2L blends is true?

Accepted Answer

They must be recovered into a designated mixed‑refrigerant cylinder and labeled

Answer

They can be vented if less than 1 kg

Answer

They can be mixed with R‑410A in the same cylinder

Answer

They may be burned off using a halide torch

Question 8

After completing leak repair, how long should an A2L system hold standing pressure without drop to verify leak integrity?

Accepted Answer

At least 1 hour at rated test pressure

Answer

5 minutes at operating pressure

Answer

24 hours at atmospheric pressure

Answer

No pressure test is required

Question 9

What is the primary reason weighing scales are mandatory during charging of A2L systems?

Accepted Answer

To ensure the exact charge is added, minimizing flammability risk

Answer

To make the process faster

Answer

To satisfy manufacturer warranty only

Answer

To avoid using a sight glass