Fridgie here. Just got some manufacturer training on some equipment that uses R-290 (propane) as the refrigerant and one of the interesting things in that training is that this manufacturer requires the use of wago lever connectors for any repairs on that equipment. They specifically tell you not to use any wire nuts or crimp connectors.
Why would they specifically require wagos? As far as I was aware the main benefit of them was ease of use and that doesn’t seem like it would make any difference as far as the manufacturer is concerned. I especially fail to see how they could be more safe and robust than crimp connections. Is there something I’m missing here?
I’ve seen this instruction when adding parts with pre-wired connections. I assumed it was because the wires were stranded and possibly CCA (aluminum) and a smaller diameter than 14-gauge, and so wouldn’t make a reliable connection with a wire nut and too brittle to crimp.
Otherwise I would guess that they’re worried about vibration shaking the connection loose, and the WAGO clamping pressure was determined to be better than the spring in a wire nut. But crimping would be best in this case, so ???