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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...
  26. So you are going to pull from the bathrooms and...

    So you are going to pull from the bathrooms and push the fresh air back to the main return duct? I was a bit leary of pulling air from the bathrooms with the ERV. My logic was that it was better to...
  27. Are you going to run the ERV in place of your...

    Are you going to run the ERV in place of your inline fan or in addition?
  28. If your basement is the only area of concern, why...

    If your basement is the only area of concern, why a whole house solution??
  29. I've been zeroing the meter to outside air before...

    I've been zeroing the meter to outside air before each measurement to take the outdoor fluctuations out of the equation. Interior volume is ~54200 cu ft. so roughly 6.5 hours per change.
  30. I wouldn't put it in the attic, you'll end up...

    I wouldn't put it in the attic, you'll end up with frost problems on the exchanger in the winter.
  31. Had 220ppm this morning, ERV 30% all night. Had...

    Had 220ppm this morning, ERV 30% all night. Had storms and wind. 3 people in house (2 adults, 9yr old + toddler). Should be 137CFM total exchange, 60 from ERV & 77 from infiltration.
  32. OK, so came home to empty house.. ERV was off...

    OK, so came home to empty house.. ERV was off for 24 hours. Wife was only home about 6 hours since this morning (50%). CO2 was 230ppm over ambient ~45CFM for 1 person, but since she wasn't here...
  33. So would you just stick with CO2 monitoring to...

    So would you just stick with CO2 monitoring to determine ventilation requirements? Unfortunately, humans are such a variable...
  34. The door is completely smooth, no ports. ...

    The door is completely smooth, no ports. Installation manual references flow collars for balancing.
  35. The unit is a Nordyne ERV-210 (Venmar). I...

    The unit is a Nordyne ERV-210 (Venmar). I haven't noticed pressure taps on it, but I'll check again. I have a manometer, so I'll see what I can come up with.

    Thanks
  36. I don't have access to a flow hood at the moment,...

    I don't have access to a flow hood at the moment, so I can't confirm the "installed" performance of the ERV. I can only go by the manufacturer specs.

    Part of the house has a sealed roof deck,...
  37. Shut off ERV at 6:30p. 190ppm over ambient...

    Shut off ERV at 6:30p. 190ppm over ambient
    8:30p 230ppm over
    6:30a 290ppm over.

    2 adults + 1 toddler in the house during that time. Will check again later today to try and get a 24 hour look. ...
  38. I have retired thoroughbreds and plenty of green...

    I have retired thoroughbreds and plenty of green grass surrounding me. All of the room measurements were 5 feet off the floor, arms length with the meter. The measurement at the vent was just for...
  39. My 2 year old woke up at 11 and didn't want to...

    My 2 year old woke up at 11 and didn't want to sleep in her room anymore, so no...

    :o
  40. I have an Industrial Scientific CDU440, should be...

    I have an Industrial Scientific CDU440, should be accurate to +-10ppm. It has been calibrated to 1000ppm, but zero'd to outdoor air (I don't have access to a "zero concentration" sample) basically...
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    I have access to a CO2 meter. Please post to my...

    I have access to a CO2 meter. Please post to my other thread on how you would recommend using that to determine if my ERV is ventilating enough/too much.
    ...
  42. Procedure for determining ACH based on CO2 levels

    I have access to a good CO2 sensor (but without logging) and would like to take measurements to determine if the CFM/run time for an installed ERV is correct. What would the recommended procedure...
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    Would also be interesting to see what it costs to...

    Would also be interesting to see what it costs to maintain this in electric consumption...
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    I have not measured actual ERV flow. This number...

    I have not measured actual ERV flow. This number is based on mfg numbers. I agree, probably on the high side of actual. The unit is a Maytag ERV-210, made by venmar but I can't seem to match up...
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    FYI Outdoor Unit Model Number: PSH4BF048KA...

    FYI
    Outdoor Unit Model Number: PSH4BF048KA
    Indoor Unit Model Number: PAH4VMX48KC
    Manufacturer: MAYTAG
    Trade/Brand name: MAYTAG PSH4BF SERIES
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    The Ultra-Aire 65H that Teddy recommended is...

    The Ultra-Aire 65H that Teddy recommended is listed at 65 pints a day (2.7/hr).

    It looks like my D run time is 1.4 hours per day?? That would mean I'm only needing to remove 11.2 pints? That...
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    Not sure if any of this is of interest, but I...

    Not sure if any of this is of interest, but I measured the condensate flow:
    Beginning LAT 60 (after 10 minute off cycle from previous D cycle)
    1.5 minutes to reach 49 LAT
    3 minutes total to solid...
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    So taking that data one step further, it looks...

    So taking that data one step further, it looks like I have a 7% overlap of D and Y1 calls?

    I have noticed the LAT as low as 45. Typically it settles in the 48-49 deg f range, I think the skew in...
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    Very cool nights lately, and lots of rain. House...

    Very cool nights lately, and lots of rain. House temp dropped down to 70 last night, again mostly due to heat loss not over cooling/dehumidifying. Indoor RH stayed in the upper 40's with only 2-3...
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    We had a much greater amount of moisture "yo-yo"...

    We had a much greater amount of moisture "yo-yo" with the ERV/dehum cycle issues. Again, hopefully this can be addressed with some logic additions on the heat pump pro. Probably reduce the D calls...
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