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  1. Replies
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    Unfortunately cost is a concern ;) I don't mind...

    Unfortunately cost is a concern ;) I don't mind spending some money for good IAQ but I can't just write a blank check :)

    If my calculations are correct, my 4200 sq ft home with 10 and 9 ft...
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    Dlove, The systems Re both 4-ton and are...

    Dlove,

    The systems Re both 4-ton and are working great. I have no complaints at all with the carrier system aside from not getting humidity below 50%. The units run about 70% of the time in low...
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    Plan to address IAQ

    Hello all,

    I'm hoping the experts here can help me lay out a plan for addressing IAQ of my Houston home.

    Short story:
    I have a 4200sq ft 2-story home (2010 build) with 2 Carrier Infinity...
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    beenthere, Not sure how he checked it. He...

    beenthere,

    Not sure how he checked it. He said the static pressure across the furnace was 0.5. Didn't go into any more detail.

    mchild,

    Really don't have an option on refusing the equipment...
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    Okay, So the Carrier rep was at the meeting...

    Okay,

    So the Carrier rep was at the meeting and brought his magnehelic (sp?) gauge :) Total static pressure on high with all zones open is 0.5. Highest static pressure of any of the zones in low...
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    Awesome davo! Thanks for the link! I had read...

    Awesome davo! Thanks for the link! I had read through that document before but totally missed the part about the bypass. I only hope that the Carrier rep speaks up about it being a bypass and that...
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    I was afraid of that! I'm suppossed to meet...

    I was afraid of that!

    I'm suppossed to meet them today with the Carrier rep to discuss the changes and operation of the system. I'll be sure to "remind" the Carrier rep that there can't be a dump...
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    Thanks for the explanation guys! That makes...

    Thanks for the explanation guys! That makes perfect sense and is exactly what I'm seeing in the house right now. The upstairs system is turned off and yet it is maintaining 77F upstairs with the...
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    davo, when you say grossly oversized...

    davo,

    when you say grossly oversized downstairs, you're referring to heating correct? If so, the units have to be oversized for heating, because of the cooling requirements (Houston is probably...
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    Okay, Got the registration key. My results...

    Okay,

    Got the registration key. My results are attached in the 2 pdfs.

    Max load - Total of 20 people in the house:

    First floor:
    sensible gain - 33450, latent gain - 12830, heat loss -...
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    beenthere, I maybe incorrect in my term of...

    beenthere, I maybe incorrect in my term of "furnace". Though, that's what Carrier calls it? I didn't realize there was a difference. I thought the terms were used interchangeably.

    I have...
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    Davo, I had asked them to put the "dump" on...

    Davo,

    I had asked them to put the "dump" on zone 1 only, but got no traction. I'll certainly revisit that with them when I speak with them again.

    Can't I also use HVAC Calc to size the ducts? ...
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    davo, Thanks for the info on the coil! I...

    davo,

    Thanks for the info on the coil! I completely agree about wanting the system to stagedown for the smaller zones calling. However, that's not what's happening. Instead, the static pressure...
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    Nope. Decreases it, since the coil is warmer. It...

    Nope. Decreases it, since the coil is warmer. It does increase sensible though.


    Crap! I told them my biggest issue with the old house was a constant 55-60% relative humidity in the house and...
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    Wait, an oversized coil reduces latent cooling? ...

    Wait, an oversized coil reduces latent cooling? Latent is humidity removal right? I thought the bigger coil increased latent cooling.

    I'm also wondering where all that extra heat is going? I...
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    mchild, That's right. I have twin systems. ...

    mchild,

    That's right. I have twin systems. Both 58CVA135 furnaces with matching coil and both with 4 ton outdoor condensers. The size of the systems isn't really for heating though. They've...
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    J, That sounds reasonable. Right now I'm...

    J,

    That sounds reasonable. Right now I'm seeing a .2" difference bettween low and high, so if they can get the low stage down to 0.6 for any given zone, the high stage will be around 0.8 which is...
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    Well, Good news / Bad news. The Carrier rep...

    Well,

    Good news / Bad news. The Carrier rep was out and definitely wanted to play a bit guarded. At first he was saying "the system can run at static of 1.0. It just spins the fan faster to...
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    Unfortunately, I don't think the installing...

    Unfortunately, I don't think the installing contractor understands that the ducts are sized too small. I mentioned to him that he could add a couple more ducts to the 2-story living and entry and he...
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    CynicX, I hope that the Carrier rep has a...

    CynicX,

    I hope that the Carrier rep has a discussion with the A/C company and everyone understands that the system shouldn't be running at a static pressure of 1.0 to 1.1, and that through their...
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    davo, Thanks for the insight! It's nice to...

    davo,

    Thanks for the insight! It's nice to know that at least the pros here on this forum know what they're doing. Too bad I can't find anyone local that does.

    I anticipate that all zones...
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    In reading through Carrier's literature on the...

    In reading through Carrier's literature on the model numbers that the hvac company supplied to me, I've realized that they installed a 5-ton furnace, a 5-ton coil, and a 4-ton outside unit. What's...
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    davo, I thought that in cooling mode the unit...

    davo,

    I thought that in cooling mode the unit HAD to deliver the minimum airflow for cooling, which would be 700cfm in low stage and 1400cfm in high stage (assuming I have the 090 model, which I...
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    Well, They said they definitely want to make...

    Well,

    They said they definitely want to make everything right. They recognize the investment and said they want to stand behind it. However, they were not able to make much progress today. They...
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    beenthere, That's exactly what TeddKid has...

    beenthere,

    That's exactly what TeddKid has been saying as well. I downloaded hvaccalc but haven't paid for it yet. I'm waiting to see what the A/C company comes back with. Even if it's...
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