A2L Leak Detection and Mitigation 2

Question 1

What type of leak detector is required for detecting A2L refrigerants?

Accepted Answer

A detector specifically calibrated for the A2L refrigerant being used

Answer

A standard halide torch

Answer

Any combustible gas detector

Answer

A UV dye detection system only

Question 2

Where should a fixed refrigerant leak detector sensor be mounted in a room with an A2L system?

Accepted Answer

Near floor level, as A2L refrigerants are denser than air

Answer

At ceiling level

Answer

At the breathing zone (4-5 feet)

Answer

Directly on the outdoor unit

Question 3

A leak detector alarms in a residential bedroom with an A2L mini-split. The homeowner is present. What is the correct first response?

Accepted Answer

Evacuate the room, open windows from outside if possible, and call the HVAC service company

Answer

Open the mini-split panel to inspect for leaks

Answer

Turn off the mini-split and go back to sleep

Answer

Ignore it if the room doesn't smell unusual

Question 4

How often should fixed A2L refrigerant leak detection systems be tested and calibrated?

Accepted Answer

At least annually, or per manufacturer's recommendations

Answer

Only when they alarm

Answer

Every 5 years

Answer

Testing is not required for fixed systems

Question 5

What is the difference between a 'threshold alarm' and a 'time-weighted average' (TWA) alarm on an A2L detector?

Accepted Answer

Threshold alarms trigger at a specific concentration instantly; TWA alarms trigger based on average exposure over time

Answer

There is no difference

Answer

Threshold is for portable detectors; TWA is for fixed systems

Answer

TWA alarms are louder than threshold alarms

Question 6

After repairing a leak on an A2L system, what verification is required before returning the system to service?

Accepted Answer

Perform a standing pressure test, verify no leaks with an electronic detector, confirm charge amount, and verify leak detection system functionality

Answer

Just add refrigerant and start the system

Answer

Only check the repair joint with soap bubbles

Answer

Run the system for 1 hour and check pressures