Diy whole house dehumidifier, Aprilaire E100V 8190FF Install, part 3

[@foodlaw5778]

Thanks for the info. We have a two-story home, and the first floor with brick cladding acts like a convection oven for the upstairs. I just completed residing using Zip R6 and reinsulating the attic, which helped mitigate the upstairs temp. I have a question: Where is the best place for the humidity gauge sensor? Upstairs has more humidity, and it would be the best place for it, logically, but the installer said not since it is going to be connected to the HVAC blower--the humidity gauge should go into the HVAC return supply. To achieve lower upstairs humidity, the whole house Humidity % will have to be lower, so then you adjust the gauge, and it doesn't matter where the control is located. Seems reasonable, any thoughts?

[@nateatgoodmayhemracing4597]

Will you be usong a Model 76 dehumidifer control, or something else? That will influence my advice.

[@foodlaw5778]

@@nateatgoodmayhemracing4597 Yes, the Model 76 controller. What do you think? Thanks a lot!

[@nateatgoodmayhemracing4597]

@@foodlaw5778 Answer Part 1 of 2. The Model 76 is good if you’re going to change your humidity on a regular basis. Once you figure out your ideal humidity though, it’s probably not going to be touched ever again. If you have walk-in access to the dehumidifier, I would use the controller on the machine itself and forgo the 76. The Ventilation addition I’m using, the 8190FF, can’t use the Model 76 or any remote dehumidify control at all, so I have to use the control on the machine anyways.

[@nateatgoodmayhemracing4597]

@@foodlaw5778 Answer Part 2 of 2. The remote humidity sensor, if used, needs to be in the place you’re having humidity problems, in this case, upstairs. The Model 76 is both sensor and control. In your case, I’d focus on dehumidifying the upstairs only, if that’s the only place that’s uncomfortable. Duct the dehumidifier in parallel to the HVAC system with it’s own dedicated return, so the dehumidified air bypasses the AC compressor and coils entirely. That’ll help alot.

[@nateatgoodmayhemracing4597]

@@foodlaw5778 Part 3 of 2. If you want my 76, you’re welcome to have it! I can’t use it, and it’s brand new.

[@chuckp32]

Do you have Aprilaire programmed to bring in fresh air at certain times? Can you go over programming Aprilaire? Thanks

[@nateatgoodmayhemracing4597]

Good question! I like the ASHRAE 90F criteria since houson's air quality is so bad, I'll try to make a vid for you.

[@foodlaw5778]

I could have missed the sqft of your home?
The E100V 8190FFwould be larger than what we need at 1,550 sqft, but it would be used with the fresh air damper, so I think the larger size will run more often, will be efficient, and won't be oversized.