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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...

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...

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...

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...

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...

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...

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...

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.

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...

Thanks, yes I've been changing the pad twice a year, but maybe I should check it more often. Once when I cleaned the tray it looked kind of scummy, but the last time it looked OK.

I've been...

Ah, that's exactly what I was wondering about so thanks for the numbers on that. My VS blower runs continuously, but it's at about 550CFM when the heat/cool is not active, so the RH in the air after...

I current have a Aprilaire bypass humidifier. We don't have any visible mold anywhere inside the ductwork near the furnace and humidifier, or inside the humidifier itself. I only keep the house at...

I have a Honeywell Prestige IAQ 2.0 with C7189R1004 wireless indoor sensors.

I've been using a calibrated digital thermometer to help me fine tune my thermostat set point, but now I have read that...

It's good to see more members from NM. We seem to be a little scarce.

Oh, and I see that the VisionPro uses P&I, not PID. Oops. But I"ll take a guess that it's continually adjusting the integral period. Maybe there's some lag there when the outdoor temp drops as...

That could be the case here. I was using a wired remote temperature sensor in an interior wall, which I have stopped using. It's possible that this wall could get cold inside. I'll check it out...

Well I've been reading up on PID control and I think this problem is due the derivative part of the PID algorithm. From what I've learned, PID control can be the best but it appears that with...

Ah thanks, that's what I was thinking but I wanted to ask to make sure. I don't think the original duct has a fire damper, but then again I didn't look.

I'm also thinking of having the added...

I'm wondering if an air return duct added to my HVAC system meets building codes, specifically for fire-rated walls.

I have split system with upflow furnace and air handler in the garage. The...

And another one from AirTest:
https://www.airtest.com/support/reference/autocalpaper.pdf

Here's a nice explanation of how CO2 sensor Automatic Background Calibration works, from Telaire:
http://www.telaire.com/refernce/appnotes/abclogic.htm

We had a party last week with ~30 people in the house. CO2 shot up to 2500 really fast and tripped the alarm. I couldn't find the instructions to set the alarm level up, so I just shut it off, but...

In response to an earlier question, my indoor dew point has been between 35F and 38F every time I've checked it for the last 3 days or so. It doesn't seem to change much.

Thanks, more food for thought!

I think this will be a popular product. With the cost of CO2 sensors dropping, emphasis on energy conservation, and increased awareness of IAQ, having an integrated product should be a good thing.
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