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  1. Just a follow-up. I decided to not put anything...

    Just a follow-up. I decided to not put anything in front of the vent. Rather, I've altered my plan and will be putting small 2 wall-mounted cabinets ABOVE the vent. I'll probably leave my vaccuum...
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    OK, I get it. Now, with my Prestige stat set to...

    OK, I get it. Now, with my Prestige stat set to slow the blower for dehum, I believe the air handler slows the blower to 85% of full speed when indoor humidity gets to the dehum setpoint. So, if I...
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    Technical question about AC compressors

    There's a question about AC compressors that I've wondered about from time to time. Some VS air handlers are able to slow the blower on high humidity, if controlled by a capable thermostat like the...
  4. They're open. I think the louvers on the outside...

    They're open. I think the louvers on the outside and the angle of the photo makes them look closed. They probably could use some cleaning though.
  5. Anybody? I think the combustion air vent and...

    Anybody?

    I think the combustion air vent and it's size is covered in the building codes or maybe NFPA, but what would be required to keep it free of obstruction is less clear. Obviously you...
  6. Pictures. Each vent opening is 6" by 14".

    Pictures. Each vent opening is 6" by 14".
  7. Thanks, I'll consider that possibility too.

    Thanks, I'll consider that possibility too.
  8. Yes, I was thinking about that after I posted the...

    Yes, I was thinking about that after I posted the question. I'll post it later. I was also thinking, regardless whatever is in front of a vent like that, I suspect that the object needs to allow...
  9. Question about combustion air intake in garage.

    OK, I have a question about the air intake in my garage. I have a gas water heater and gas furnace on my garage, so there's a vent in the wall to bring in combustion air. I'm reorganizing the...
  10. Hmm, I was thinking it would be just the...

    Hmm, I was thinking it would be just the opposite. Most consumers would not have a clue of what the performance logs mean, assuming that the logs consist mostly of Delta-T measurements. I would...
  11. New Honeywell Redesigned Prestige IAQ vs VisionPRO 8000 w/RedLINK (with EIM)

    New Honeywell Redesigned Prestige IAQ vs VisionPRO 8000 w/RedLINK (with EIM).

    I'm looking at these two and wondering what the functional differences are. Despite the obvious difference of color...
  12. So, here I am two years later, with more...

    So, here I am two years later, with more information after a couple of heating and cooling seasons. The primary problem is that the back bedroom is sometimes colder than the rest of the house. When...
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    Well I had a UVC light running (under the A coil)...

    Well I had a UVC light running (under the A coil) most of the cooling season. This morning it was cold so I turned on the heat (heat pump) to see how it smelled. The first 5 minutes or so I could...
  14. Looking at dehu specs I see the old Honeywell...

    Looking at dehu specs I see the old Honeywell DH90 and Ultra-Aire 90H models mentioned here and there. It looks like these were R22, but other than going to R410A and some cosmetic upgrades, what is...
  15. So, I did a little experiment to confirm what...

    So, I did a little experiment to confirm what I've read about using continuous low speed fan. With the fan off for a few days, indoor RH was at 46% today when I turned the continuous fan back on. ...
  16. And it looks like the Aprilaire dehumidifiers are...

    And it looks like the Aprilaire dehumidifiers are energy hogs compared to the Honeywell and Ultra-Aires.
  17. Hmm, curious that Aprilaire didn't bother to put...

    Hmm, curious that Aprilaire didn't bother to put the fresh air port on theirs.
  18. So the ones with the fresh air port don't have...

    So the ones with the fresh air port don't have any sort of balancing damper built in, they just have the fresh air port for convenience?
  19. Thanks again for the insight. The Honeywells...

    Thanks again for the insight.

    The Honeywells are rebranded Ultra-Aire models, and it appears that the XT models are exclusive to Ultra-Aire, right?

    Edit: And what's the deal with the...
  20. Not sure what you are implying, but it seems like...

    Not sure what you are implying, but it seems like that would be sufficient unless infiltration and outdoor RH are high.
  21. So what are the technical differences between the...

    So what are the technical differences between the Ultra-Aire, Honeywell, and Aprilaire dehus that make some of them able to achieve a lower dew point, regardless of PPD capacity? I see that...
  22. Excellent info, teddy bear. Right now...

    Excellent info, teddy bear.

    Right now outdoor is at 85F 36% and indoor 76F 42%, and I have a steady fast drip of condensate so the AC is obviously removing considerable moisture, just not enough...
  23. Would it be safe to assume that a dehumidifier...

    Would it be safe to assume that a dehumidifier could produce condensate down to the lowest dew point as my AC can, or lower?
  24. I see, so the XT105H can do 4-5 lbs/hr at...

    I see, so the XT105H can do 4-5 lbs/hr at "normal" dew points, but 2-3 lbs/hr at low dew points. A smaller unit like the 70H might only do something like 3-4 lbs/hr at higher dew points and might...
  25. OK, I guess the next question is sizing. My HVAC...

    OK, I guess the next question is sizing. My HVAC guy is going to think I'm nuts when I say I want to put in a dehumidifier for this. I guess when I explain about the allergies/asthma he'll get it,...
  26. Thanks for the tips guys. I think I'm headed...

    Thanks for the tips guys. I think I'm headed toward a dehu solution for this. Do the coils in the dehu run colder than an AC evap coil? Do they have defrost?
  27. But what about those times when the AC is not...

    But what about those times when the AC is not running much, like at night? And cooler days (like 80F) when the load is light and the AC might only be running 25-50% of the time?
  28. Actually I would be totally in favor of having...

    Actually I would be totally in favor of having ALL the humidity removal to be in the dehu, even if I have to oversize it. It seems to me that if we can't count on the AC running all the time to...
  29. More system details: York TM8V 80K BTU, 4 ton...

    More system details:
    York TM8V 80K BTU, 4 ton blower, upflow
    York MC43 coil
    York YHJF30 heat-pump condenser, 2.5t, 14.5 SEER
    Aprilaire 2210 media filter with 213 filter (5 inch)
    Honeywell...
  30. Thanks teddy bear, I figured you would be...

    Thanks teddy bear, I figured you would be visiting this thread before too long. We're going to try the next slower speed, but no lower. We really should be at about 475 CFM/ton at this altitude for...
  31. Ah, I get it now. Maybe I'll see if a lower...

    Ah, I get it now. Maybe I'll see if a lower blower speed will do it, before I drop a bunch of money on a dehumidifier. Of course, that would only work on days that need cooling.

    If I do need the...
  32. Yep, we set it at 76F with 2F overcooling...

    Yep, we set it at 76F with 2F overcooling (Honeywell Prestige IAQ). If the outdoor RH would drop a little, we could open the windows, but the weather has been stubborn lately. Funny, earlier in...
  33. Reducing humidity from 50% to 30% for allergies - is this practical?

    I have allergies and asthma and have found that I feel much better when indoor humidity is low - like 20-40%. It's very dry here, with outdoor humidity around 10-20%, so normally I have to use a...
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    UVC lights - branding and marketing

    Can anyone tell me the difference between the Fresh-Aire UV Blue-Tube model BTER and the Gemtech model GTUV, other than warranty and labeling?

    These are both made by Triatomic.
  35. Getting UVC light installed under A-coil - do I need to worry about the drain pan?

    I'm getting a UVC light installed under my A-coil (through the delta plate). Do I need to worry about UVC damage to the drain pan? It's a MC43 coil, installed about ~2 years ago. I'm thinking that...
  36. They forgot to name the head flight attendant...

    They forgot to name the head flight attendant (the one with the American first name), Ann To Slo
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    Well, I've decided to have the return changed. ...

    Well, I've decided to have the return changed. The 20x10 return duct that had the stud in the middle where it goes through the wall will be replaced with a 14x14 return duct which fits between the...
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    Not sure on the fire rating question. The other...

    Not sure on the fire rating question. The other return that penetrates the garage wall does not have a fire damper, so I suspect the wall is not fire-rated and that's the way they build them around...
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    Thanks for the reply. It's return air so...

    Thanks for the reply.


    It's return air so we're OK there.


    I have no idea if it's fire-resistance rated. It's just the wall between the living room and the garage. The other return goes...
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    Stud in air return - is this allowed?

    When I was cleaning out the air return plenum under my furnace I noticed that there is a stud in one of the two air returns. This return was added when my AC was installed because the existing 10x20...
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    I was wondering about that - which side most...

    I was wondering about that - which side most stuff would grow on. Why does it grow more on the supply side?
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    The best UV light location for an A-coil

    For A-coil irradiation by UVC light, what is the best location for the lights? Some manufacturers recommend one light inside the coil (mounted through the delta plate) but some recommend two lights...
  43. I think what you are saying is that you don't...

    I think what you are saying is that you don't like the idea of the temperature or dew point limits? The temperature limits can be adjusted (and may not matter due to infiltration at the high and low...
  44. That's what I was thinking. With an HRV/ERV you...

    That's what I was thinking. With an HRV/ERV you could use the CO2 sensor relay to cycle the unit. Since you are recovering most of the heat, the ventilation temperature limits wouldn't really be...
  45. I think you could do something simpler,...

    I think you could do something simpler, especially if a HRV/ERV is not needed. Let's say, for example:

    A simple fresh air intake (filtered) for maintaining air quality based on CO2 levels. The...
  46. OK, I've been watching the CO2 levels for a...

    OK, I've been watching the CO2 levels for a while, and I see a lot of variation. So, I think using DCV (demand controlled ventilation) with the CO2 sensor would be good.

    So, here's what I'd...
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    Honeywell Redesigned Prestige IAQ

    I was just wondering what you pros think about the new "Redesigned Prestige IAQ". My first thought is that they should have given it a better model designation, but maybe that's just me.

    It...
  48. Well, according to my Prestige 2.0 IAQ, the...

    Well, according to my Prestige 2.0 IAQ, the indoor humidity is 29% at 73F, so the AA 400 is doing OK even though it only ran with heat last night.

    In case you're wondering just how dry it can get...
  49. Yeah, at this point I'm really just speculating. ...

    Yeah, at this point I'm really just speculating. In any case I changed it to only humidify during heat, to see if that makes any difference. I'm not sure it can hold 30% only running during heat.
  50. I'm not sure the humidifier has a dry time every...

    I'm not sure the humidifier has a dry time every day. Some days it could be wet all day, or even for several days on end.

    This is why I was wondering if some other kind of humidifier that doesn't...
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