New Caddy Advanced owner

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Yes having this setup for the current 1600 SF as well as the future ~2500 SF is key.

I'm super anxious to get this done. The Caddy is already heating the home like the Jensen did: radiated heat coming up the stairs and down the hallway. Yes the far rooms are like 15 degrees cooler since there's nothing coming out of the registers, but aside from that, the Caddy is keeping up with the demand on nights in the low teens F. I can't wait to see what it does as a forced air unit LOL.
Did you figure out the overtemp issue or is it the ductwork thats causing that?
 
Did you figure out the overtemp issue or is it the ductwork thats causing that?
The overtemp issue was primarily due to not having the barometric damper early on when I was seeing drafts of 0.07”-0.08” wc. Since adding the damper, it’s only entered over temp once and that was because I stupidly left the Ash pan door loose as a way of smoke reduction when doing a cold start.

The small size of the supply duct does have an effect on the temperature of the unit I believe, but not to the extent of overtemp. Because the duct is so small, my theory is that the hot air stays concentrated in the Plenum. The blower stays on quite a bit even when not calling for heat. That’s because the RTD kicks the blower on at 190°F, regardless if it’s calling for heat. My hope is that the blower will kick on a lot less when that hot air is able to escape. The furnace radiates quite a bit of heat, which is against what I’ve been reading on the forum. It’ll heat the basement totally, with really no need for a supply vent. That’s good for downstairs, but I need the heat flowing up stairs.
 
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