FREE ESCO A2L System Installation, Operation & Servicing Questions and Answers

Question 1

During initial installation of an A2L split system, what ventilation requirement must be verified for the occupied space?

Accepted Answer

Ventilation sufficient to keep refrigerant concentration below the RCL

Answer

At least 4 air changes per hour

Answer

No mechanical ventilation is required

Answer

Ventilation equal to an A3 (propane) installation standard

Question 2

Which piping material is approved for fixed A2L refrigerant lines under current UL/CSA safety standards?

Accepted Answer

Type L or ACR copper tubing

Answer

Schedule 40 PVC

Answer

Black iron pipe

Answer

Flexible vinyl hose

Question 3

Before charging an A2L system for the first time, which procedure must be completed to ensure safety and integrity?

Accepted Answer

Perform a leak test with nitrogen and trace refrigerant

Answer

Add compressor oil

Answer

Power the compressor to warm the crankcase

Answer

Open all service valves to atmosphere

Question 4

When servicing an operating A2L rooftop unit, what tool safety practice is required around the refrigerant circuit?

Accepted Answer

Use spark‑proof (intrinsically safe) tools only

Answer

Disconnect the building fire alarm system

Answer

Remove all electrical grounding clamps

Answer

Operate torches within 6 inches of tubing

Question 5

Which leak‑detection method is recommended for charged A2L systems in service?

Accepted Answer

Electronic (electrochemical) leak detector

Answer

Soap‑bubble solution only

Answer

Open‑flame halide torch

Answer

Apply vacuum and listen for hissing

Question 6

During refrigerant recovery of an A2L system, the recovery machine must be:

Accepted Answer

Listed for use with A2L refrigerants

Answer

Rated only for CFC refrigerants

Answer

Modified with a standard vacuum pump

Answer

Operated without a filter‑dryer

Question 7

Why must evacuation of an A2L system reach at least 500 microns before charging?

Accepted Answer

To ensure no air or moisture remains in the system

Answer

To eliminate all traces of oil

Answer

Because A2L refrigerants require a vacuum to flow

Answer

To check that service valves are fully open

Question 8

When replacing a compressor in an A2L unit, which additional component is commonly recommended to install?

Accepted Answer

Suction‑line filter‑dryer

Answer

Sight glass

Answer

Low‑pressure control

Answer

Hot‑gas bypass valve

Question 9

After servicing, what documentation should be completed to comply with EPA and manufacturer A2L guidelines?

Accepted Answer

Detailed service log including refrigerant weight added or removed

Answer

Verbal confirmation only

Answer

Discard all notes for data security

Answer

Only record the customer's signature