R454B leak detection and mitigation devise

personally all these safety’s are lawyers getting involved.

it burns if there’s a flame present but once that flame goes out it goes out. It’s not self supporting!

Every time the patents run out its time to get a new one

but that would require you regulate presumably the actual biggest source of emissions in consumer refrigeration products, poor quality leading to the refrigerant escaping while in service.

It's part legal requirements and part manufacturers trying their hardest to not end up on the news or in a courtroom. As far as I can tell all manufacturers are handling the detection and mitigation similarly with slight differences in sensor location and what concentration they mitigate at. You see the sensors in the coil because in a normal upflow installation the refrigerant (if leaking) will fall down to the burner, the manufacturer takes care of this part because they are required to do so (there's a fire in there after all). The equipment manufacturers are not supplying any sensors or mitigation for your connections outside the mechanical room because it is not their job to do so, and quite frankly local codes haven't all decided what will or will not be required of you for leak detection outside the cabinet From what I can tell all the boards, whether built in or separate (they will likely all be built in within the next year ) can take an extra sensor as there will be situations with 2 furnaces in one room where codes or manufacturers requirements will require a second sensor on the outside of the furnace cabinet to prevent one refrigerant line from leaking and ending up in the other furnaces cabinet. Allied Air brands and I think Lennox as well have sleeves for where the lineset connection is made at the coil so if your field connection leaks it gets picked up by the sensor, should make finding a leak just a bit easier

Honestly from an equipment perspective this is such a minor change, and one that should detect a leak before there is a real problem which may be beneficial to an installer. The parts I am worried about are the local code requirements for refrigerant piping, they aren't even finalized here and the guys are installing the stuff.

@SuperTech much of europe requires the sensors since about 2020. One of the sensor manufacturers was key to getting the regulations passed (go figure) I imagine much of Europe doesn't have typical gas fired furnaces so the overall possibility of a leak actually igniting goes down tremendously when you have an air-to-water heat pump, or a wall mounted mini split.