A2L Requirements for Fixed and Portable Leak Detection Equipment 2

Question 1

Under UL 60335-2-40, when is a fixed refrigerant detection system mandatory for A2L installations?

Accepted Answer

When the system charge exceeds the basic room-volume charge limit and mitigation measures are used to allow a larger charge

Answer

Always, for every A2L installation

Answer

Only in commercial buildings

Answer

Only when the system uses R-32

Question 2

What is the required response time for a fixed A2L refrigerant detector to reach alarm condition?

Accepted Answer

Within 30 seconds — the detector must respond quickly enough to trigger ventilation before concentrations reach dangerous levels

Answer

Within 30 minutes

Answer

Within 5 minutes

Answer

No specific time requirement

Question 3

How should a portable refrigerant detector be maintained for reliable A2L service?

Accepted Answer

Regular bump testing with known calibration gas, annual professional calibration, sensor replacement per manufacturer schedule, and battery maintenance

Answer

No maintenance needed — they work forever

Answer

Just change batteries when they die

Answer

Only calibrate when it stops working

Question 4

What is a 'bump test' for a refrigerant detector and how often should it be performed?

Accepted Answer

Briefly exposing the sensor to a known concentration of target gas to verify it responds and alarms correctly — recommended before each use or at minimum monthly

Answer

Dropping the detector to test durability

Answer

Testing if the detector floats in water

Answer

Checking if the display lights up

Question 5

A fixed leak detection system in a commercial building shows a 'sensor fault' indication. What should be done?

Accepted Answer

Treat the affected zone as if detection is unavailable — reduce system charge or restrict the area until the sensor is repaired/replaced

Answer

Reset the system and continue normal building operations

Answer

Ignore it if no leak alarm is present

Answer

Switch to manual monitoring with portable detectors permanently

Question 6

What certification or listing should fixed A2L leak detection equipment carry?

Accepted Answer

UL or equivalent listing for combustible gas detection, specifically tested and approved for the A2L refrigerant it will monitor

Answer

No certification required

Answer

Only CE marking

Answer

EPA certification