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  1. Replies
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    I did find another sensor out there from Tongdy...

    I did find another sensor out there from Tongdy (Chinese) that looks like it would be perfect. They say the sensor will be fine and does not require outside air to stay calibrated. TKG-CO2-2010C
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    Response from Honeywell: Here is the response...

    Response from Honeywell:

    Here is the response to the question from the product manager.

    It looks for 4 straight hours of unoccupied levels (about 400ppm) per 8 days. They could take it...
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    The honeywell has default set point of 800ppm on,...

    The honeywell has default set point of 800ppm on, 700 ppm off. I think that would fit most needs.

    What type of controls do you use for ventilation?
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    Also, I know the Honeywell unit isn't the only...

    Also, I know the Honeywell unit isn't the only sensor on the market... If anyone has used these systems before in residential ventilation, are there any other manufacturors that require a look? Ive...
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    I would be interested to hear from anyone with...

    I would be interested to hear from anyone with real world experience with these sensors. How much drift to you find in your portable meter? If we are only talking a few ppm per month, then I can...
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    CO2 sensor auto calibration

    I'm looking at CO2 sensors, in particular the Honeywell C7232B1006. All of them seem to have an auto calibration feature the checks against a baseline to detect drift. The honeywell manual...
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    How old is the unit? More than 2 years, probably...

    How old is the unit? More than 2 years, probably compressor failure. Known to happen on this model. Pop the front cover off after it's been running for a while and check for ice buildup.... Sure...
  8. This is an old thread, but I wanted to update...

    This is an old thread, but I wanted to update with some new data. I had a blower door test done today. Came back with readings between 2000 and 2300 cfm @ -50. The meter was reading "Lo" for a...
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    Is it really going to be that big of a problem to...

    Is it really going to be that big of a problem to pull some air from up there? I'd suggest monitoring your return air temps at the air handler and see what happens when you set back that zone.
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    What zoning system are you using?

    What zoning system are you using?
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    How does that compare to airflow with the zone...

    How does that compare to airflow with the zone calling?

    Sounds to me like not enough return from the other zones...

    I still don't think it will be a problem.
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    With the door closed the airflow into the return...

    With the door closed the airflow into the return should be lower. Air will take the path of least resistance. You will still get some air from the "closed" zone, but I think the impact would be...
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    Seeing how this room is directly above the...

    Seeing how this room is directly above the furnace and the warmest, I'm going to guess the system wasn't balanced and doesn't have adjustable dampers directly off the trunk. That would be the first...
  14. Honeywell Visionpro IAQ and winter dehumidify?

    Honeywell VP IAQ, Maytag heat pump system, arzel zoning, Maytag/Venmar ERV, truesteam humidifer, tight house.

    IAQ is set to humidify at 40% (Frost protection 4), dehumidify at 50%.

    Except...
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    Could the HP be running in defrost when Aux heat...

    Could the HP be running in defrost when Aux heat is on?
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    And it works... :yes: I can't speak for...

    And it works... :yes:

    I can't speak for non-heat pump systems, but our Arzel HPP puts out consistent register temps AND velocity regardless of which zone or how many zones are calling. Comfort...
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    Then kick on the fan, you'll need the fresh air...

    Then kick on the fan, you'll need the fresh air to keep CO2 down if you have that many people in 950 sq. ft.
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    Check out Arzel. I've got a HPP and love it. ...

    Check out Arzel. I've got a HPP and love it. Since you already have a system in place and are only looking at a new zone for the basement, why not consider something like a slave zone or "add a...
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    Data from August: Avg OAT 73.8 Z1 cooling call...

    Data from August:
    Avg OAT 73.8
    Z1 cooling call 4%
    Z2 9%
    Z3 3%
    Z4 3%

    Y1 27% (includes D calls)
    Dehum 15%
    ERV ran 28%
  20. Yes and Yes. I think the percentage of run time...

    Yes and Yes. I think the percentage of run time for the range hood/central vac/dryer are fairly minimal. Certainly when compared to the ERV run time. I haven't taken CO2 measurements while either...
  21. The fan is located between the heated corner tub...

    The fan is located between the heated corner tub (I think it's about 180 gallons) and the shower (has sprays and water from multiple walls). I hate steamy bathrooms. I want to be able to shut off...
  22. M Bath is about 170 sq ft, WC is about 20.

    M Bath is about 170 sq ft, WC is about 20.
  23. I don't have a whole house dehumidifier, only the...

    I don't have a whole house dehumidifier, only the dehum cycle built into the Arzel HPP zone panel.

    I'm trying to piece together a time of day based relay system that will only open my bedroom...
  24. This is one of the reasons I like the VP IAQ. It...

    This is one of the reasons I like the VP IAQ. It *attempts* to satisfy vent requirements during cooling/dehum runs first, and then only runs without Y1 if required to meet minimum vent settings.
  25. Personally, I think that if you are going to...

    Personally, I think that if you are going to exhaust, you should exhaust... Our master bath has a 180CFM fan near the shower/tub and a 50 CFM fan in the "WC". The other 3 bathrooms have 80 CFM fans...
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