Understanding Active Dissipation

Along with new refrigerant for 2025, we’re also seeing new components for safety to be compatible with new Federal guidelines.  Today, I will go over some of the new components, and the purpose they serve.

All products and systems designed for Puron Advance 454b, will require an active dissipation system to mitigate refrigerant leaks. The dissipation system includes a factory-installed leak sensor and a factory or field-installed dissipation control board (depending upon the equipment) that will override the thermostat when a leak is detected.

The leak sensor will trigger and activate a dissipation when it detects presence of refrigerant at a LFL ( Lower Flammability Limit) of 20%.

The dissipation board will shut off all ignition sources, any heating or cooling units that are operating, and will activate the blower to run so the air can be diluted for a minimum of 10 minutes or until the sensor reads <11% LFL.

There will be an additional 5-minute delay where the blower remains off to monitor for a leak. If the sensor doesn’t detect any refrigerant, the system will go back to normal operation.

The sensor and board should be mounted and wired into fan coils and small package units. No additional wiring is required. Please refer to the installation manual for proper mounting and wiring procedures.