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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...
  4. Replies
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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...
  7. Replies
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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...
  8. Replies
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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...
  9. Replies
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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...
  10. Replies
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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 -...
  11. Replies
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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...
  12. Replies
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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? ...
  13. Replies
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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...
  14. Replies
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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...
  15. Replies
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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...
  16. Replies
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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...
  17. Replies
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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...
  18. Replies
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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...
  19. Replies
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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...
  20. Replies
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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...
  21. Replies
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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...
  22. Replies
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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...
  23. Replies
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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...
  24. Replies
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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...
  25. Replies
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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...
  26. Replies
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    I need to verify the furnace size, but it is...

    I need to verify the furnace size, but it is suppossed to be sized for a 4-ton cooling system so the minimum it will push during low stage cooling will be 700cfm. There is no need for this much...
  27. Replies
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    beenthere, Yeah, after much reading I realized...

    beenthere,

    Yeah, after much reading I realized that's exactly what I was doing. Confusing duct velocity and register face velocity, which really aren't related except that they are both moving...
  28. Replies
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    Beenthere, Just read through Udarrell's...

    Beenthere,

    Just read through Udarrell's website a bit more and see that for round flex duct, 700fpm is an acceptable speed for supply ducts, but for supply registers, the speed should be around...
  29. Replies
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    beenthere, The 300fpm was a number I got from...

    beenthere,

    The 300fpm was a number I got from UDarrell's website as a rule of thumb to maintain quiet airflow. The website also suggested that for returns, typically there is a 25% reduction in...
  30. Replies
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    Gotcha! So the load calc determines flow rate...

    Gotcha! So the load calc determines flow rate and manual D calculates duct size to accomodate the required flow rate at a design flow velocity. The design velocity is sort of at the discretion of...
  31. Replies
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    Frank, I do truly wish that were the case, but...

    Frank,

    I do truly wish that were the case, but here in Houston we are building away with no real downturn. The benefit of cheap land :) I did approach the builder about using my own contractors...
  32. Replies
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    Thanks for the references! Unfortunately there...

    Thanks for the references!

    Unfortunately there is noone within 100 miles of 77433 on bpi's or energy stars list.

    I manually set fan speed to high to see what the static pressure was reading. ...
  33. Replies
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    teddkidd, You have any relatives in Houston? ...

    teddkidd,

    You have any relatives in Houston? You could make a killing down here :) I truly whish I could find someone with the knowledge and professionalism you seem to have. Believe me, I am...
  34. Replies
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    Tedkidd, I'm 100 percent with you on that. I...

    Tedkidd,

    I'm 100 percent with you on that. I am one of the educated consumers and that's why I wanted the 2 stage cooling. I would love to have my A/C running continuously in the summer sucking...
  35. Replies
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    tedkidd, I agree completely. I doubt they did...

    tedkidd,

    I agree completely. I doubt they did a load calc with the infinity zoning in mind. This floor plan typically gets (2) 3 ton units, 1 up and 1 down. But because I had added some sq...
  36. Replies
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    I managed to get a couple of pictures upstairs,...

    I managed to get a couple of pictures upstairs, but there's just not much room so it's tough to see what's going on. To orient you, the left of the image is the return air plenum. The large duct is...
  37. Replies
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    Well, The hvac company guy was at the house...

    Well,

    The hvac company guy was at the house this afternoon and I explained what was going on. He said he would take some static measurements and see what he finds out. I suggested that the...
  38. Replies
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    beshvac, That is very good advice, and I truly...

    beshvac,

    That is very good advice, and I truly wish I had that option available. Unfortunately the builder doesn't do $$ allowances. You can upgrade, but you have to use his guys, so I was...
  39. Replies
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    J, The house is well insulated and does have...

    J,

    The house is well insulated and does have low-e double paned glass. As I mentioned, there are a number of south and west facing windows. I've attached the floorplan below, but there are:
    ...
  40. Replies
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    firecontrol, I will definitely request copies...

    firecontrol,

    I will definitely request copies of the manual J and D. Unfortunately, the installer is the builders choice, not mine. They are a Carrier authorized dealer so at least I have that...
  41. Replies
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    I'll try to get some pictures, sizes, etc of the...

    I'll try to get some pictures, sizes, etc of the system tonight. I believe my returns are 20x25" in the "living area", 12x12" in the "media room", and 12x12" in the "master bedroom", but I'll double...
  42. Replies
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    There are 10 supplies on 1 zone of the system. ...

    There are 10 supplies on 1 zone of the system. The other zones have additional supplies. All told there is 16-18 supplies.
  43. Replies
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    Total home is 3800sq ft with a lot of south and...

    Total home is 3800sq ft with a lot of south and west facing windows on the first and second floor.

    The A/C guy said that the manual J calculations suggested a 3.5 ton system for the first and...
  44. Replies
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    Carrier zoning and static pressure

    Hi all,

    Now that I have the proper controls for my system "see thread here", I have some performance data that I wanted to run by you guys.

    The system includes 2 Carrier Infinity systems (1...
  45. Replies
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    Update - The builder and A/C company took care of...

    Update - The builder and A/C company took care of it. They replaced all dampers and damper control with Infinity systems and replaced the upstairs and downstairs controls. I now have all infinity...
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    tedkidd, They weren't worried about heating as...

    tedkidd,

    They weren't worried about heating as much as cooling. The cooling load in Houston is tremendous due to very high temps and very high humidity. We vary rarely use the heat.

    This A/C...
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    Tedkidd, I asked about doing a single unit,...

    Tedkidd,

    I asked about doing a single unit, but they said that the largest unit would not be enough for my home (~3800sqft in Houston).

    I also did confirm today that they installed honeywell...
  48. Replies
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    True, the contract itself doesn't specify the...

    True, the contract itself doesn't specify the equipment. However, this builder is quite strange in that regard. They reference the emails as the specifics for contract items. An example is...
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    jrbenny, your post got me to thinking and I...

    jrbenny,

    your post got me to thinking and I rummaged back through my emails and they did in fact say "Zoning controls - to add Carrier Infinity Zoning....."

    Thanks for the extra motivation to...
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    tedkidd, Thanks!!!! There is nothing like...

    tedkidd,

    Thanks!!!!

    There is nothing like this installed anywhere in my house. I'm quite sure now that they have not installed the infinity zoning system. Also, I was at the house earlier and...
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