A2L Mitigation 101 – A General Overview As we transition to low-GWP A2L refrigerants like R-32 and R-454B, built-in safety systems are required to comply with UL 60335-2-40. Here’s a quick breakdown of what A2L mitigation looks like in HVAC equipment: Key Hardware: - A2L Refrigerant Sensors: Installed in the airstream and/or mechanical cabinet to detect leaks. - Control Board / Mitigation Module: Receives sensor signals and triggers safety responses. - Relay Outputs: Control compressors, fans, i

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