Loved the video. There's one thing you should add on the damper. Which is some sort of a screen. So you can prevent bugs and other critters from getting inside when it is open.
I like that generator setup. I find it neat that you put the damper and exhaust fan on thermostats that will activate when needed. I couldn't imagine how often that heat detector would go off without that vent system.
In regards to the issue of powering the dampers off the building AC supply and being reliant on a successful transfer to emergency power to ensure the damper opens I would say your best option would be to power it off DC from the generator battery. The datasheet of the LMB24-SR damper motor says it can accept 19.2 to 28.8 V DC so you could just use a little 12 V to 24 V DC-DC converter to power it from the generator starter battery, it's only 1.5 W when moving so the battery and maintenance charger could easy supply that. You should also be able to remove the relay by wiring it different, unfortunately at the moment I don't think you've wired it correctly. You seem to be applying 24 V AC across the Y and U terminals to open it, however only Y is used for control, U is an output for the position feedback signal. It previously opened when you connected it to the transformer because it was powering the Y control signal from the U output position signal through the winding of the transformer as you suspected. It goes to 50% because that's that point where the feedback signal matches the control voltage, likely about 5V. Also don't know about controlling it with 24 V directly, it likely does has input protection but it's not designed for continuously applying 24 V, just small transients, doing so will cause the internal protection components to overheat and fail over time. To solve this you can just use a 500 ohm resistor as the datasheet recommends, BELIMO even sells this as a pre-made heat shrunk cable, part number ZG-R01. But anyway this has been a cool project to follow!
An outside of temperature of 21 degrees should be just fine for your generator, i’d only be concerned about it if it’s 38 or above because your generator building is insulated. Here in Florida, especially after a hurricane passes, I see people running that kind of generator when it’s over 30 degrees with the sun beating down on it. I think your current setup is fine
The temperature outside is a lot higher inside an insulated building. The more temperature change the more fuel vapours will be vented into the building.
@@nics-systems-electric that is why the kind of generator you have is not permitted to be in a building like yours it has to actually be out side no building to protect it but we solved that issue just get a normal stand by generator from genarac or a number of companies that make them that come with a cabinet made of steel and are velatlated 24 7 with luver vents
