ESCO A2L - ESCO A2L Refrigerant Recovery and Evacuation Questions and Answers

Question 1

A technician is performing a recovery on a system containing the A2L refrigerant R-32.
What is the most critical practice to prevent the dangerous condition of hydrostatic pressure build-up inside the recovery cylinder?

Accepted Answer

Monitoring the weight of the cylinder to ensure it is not filled beyond 80% of its water capacity.

Answer

Chilling the recovery cylinder with ice before starting.

Answer

Frequently purging non-condensables from the recovery machine.

Answer

Using the push-pull recovery method to speed up the process.

Question 2

When evacuating a system that previously contained an A2L refrigerant, what is the primary reason for using a vacuum pump specifically rated for A2L or A3 refrigerants?

Accepted Answer

They are designed with spark-proof motors and isolated electronics to prevent igniting residual refrigerant.

Answer

These pumps achieve a deeper vacuum level (below 100 microns) faster than standard pumps.

Answer

Their internal components are more resistant to the aggressive synthetic oils used with A2Ls.

Answer

They have a built-in micron gauge for more accurate readings.

Question 3

Which of the following recovery procedures is permissible for some refrigerants but is strictly prohibited for all HFC and HFO refrigerants, including A2Ls, under EPA Section 608 regulations?

Accepted Answer

Intentionally venting refrigerant to the atmosphere.

Answer

Recovering refrigerant in a liquid state.

Answer

Using a passive (non-powered) recovery method.

Answer

Mixing different types of recovered A2L refrigerants in one cylinder.

Question 4

A technician is preparing to recover R-454B from a large commercial rooftop unit. To maximize efficiency and speed for removing the bulk of the charge, which recovery method should be used first?

Accepted Answer

Use the push-pull method to remove the charge as a liquid.

Answer

Start by recovering vapor until the system pressure drops into a vacuum.

Answer

Use a passive recovery method by cooling the recovery tank significantly.

Answer

Connect only to the high-side port to avoid pulling oil from the compressor.

Question 5

After a major repair on an A2L system, such as a compressor replacement, the technician must pull a deep vacuum. What is the primary purpose of evacuating the system to 500 microns or lower?

Accepted Answer

To remove atmospheric air and dehydrate the system by boiling off any moisture.

Answer

To ensure all flammable refrigerant residue has been boiled off and removed.

Answer

To test the system for leaks before adding the new refrigerant charge.

Answer

To pre-cool the system components, making the subsequent charging process faster.

Question 6

When setting up recovery equipment on a job site to service an A2L system, which of the following actions is a critical safety requirement to mitigate flammability risks?

Accepted Answer

Ensure the recovery machine and cylinder are properly grounded.

Answer

Wrap all service hose connections with PTFE tape to prevent leaks.

Answer

Keep the recovery machine unplugged until the system pressures have equalized.

Answer

Position the recovery machine downhill from the system being serviced.

A technician is performing a recovery on a system containing the A2L refrigerant R-32.What is the most critical practice to prevent the dangerous condition of hydrostatic pressure build-up inside the recovery cylinder?

A technician is performing a recovery on a system containing the A2L refrigerant R-32.
What is the most critical practice to prevent the dangerous condition of hydrostatic pressure build-up inside the recovery cylinder?