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  1. Replies
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    Hacking Carrier Greenspeed Wifi Thermostat?

    I've got the 5-ton Carrier Greenspeed HeatPump (and love it) and just recently got the WiFi version of the thermostat installed.

    One thing I've been longing to do (since I'm an engineer :D) is to...
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    I don't think THAT'S true. But, due to the...

    I don't think THAT'S true.

    But, due to the nature of the show, I wouldn't expect to see many episodes where everything was done right so he WOULD be praising the contractors.

    I will say,...
  3. Other than new construction, what's the point of...

    Other than new construction, what's the point of installing everything else first?

    I guess as long as you don't already have a working system, there's not much harm.
  4. Nice analysis. Where'd you get that info? ...

    Nice analysis.

    Where'd you get that info?

    I'd like to compare Houston (where I moved from) to Dallas (where I moved to) to Oklahoma City (where I'm from).
  5. I agree with him. And ask how many people...

    I agree with him.

    And ask how many people would like to get rid of their AC altogether. That'd sure reduce the utility bill. :D
  6. All I can say is I can't wait to try out this...

    All I can say is I can't wait to try out this system once my new house is done!
  7. Replies
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    3,228

    No, he's referring to insulating (spray foam) the...

    No, he's referring to insulating (spray foam) the roof deck, rather than insulating the ceiling.

    This results in the attic being in the (semi)conditioned zone.
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    I'd love to have that "problem". If your...

    I'd love to have that "problem".

    If your system is set to "Comfort" or "Dehumid", you might try setting it to "Efficiency" or "Maxmum" to see if that helps.

    That should turn off the abiilty of...
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    In a perfect world, I'd keep it at 40%. My...

    In a perfect world, I'd keep it at 40%. My guitars and piano are happiest there, as I am.
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    Any geothermal system work like this?

    Most contractors tell me that they have to drill one 200-300' vertical well for every ton of AC/heat (plus an additional well, according to at least half).

    They all seem to sell a dual-stage...
  11. We keep the blinds closed almost all the time. ...

    We keep the blinds closed almost all the time. (Sorry, no drapes).

    I'm getting them to run that sensitivity for me.
  12. Not very likely to happen at this point. The...

    Not very likely to happen at this point. The main thing would be to go after windows. I've got about 450 sq ft of windows. But I'd be crazy to reduce it (unless we go back to the 60's in terms of...
  13. That would be great, as long as they don't mind...

    That would be great, as long as they don't mind talking to an end-user.
  14. Designing each zone to handle the minimum 700 CFM...

    Designing each zone to handle the minimum 700 CFM doesn't really bother me (extra cost, that is . . . if it's required to make it work better), but I do have a concern (perhaps unfounded?) that...
  15. Care to clarify a bit? The 700 CFM is correct...

    Care to clarify a bit?

    The 700 CFM is correct (check the specs). At its lowest setting, the 5-ton unit will put out only 2-tons of AC and requires 700 CFM. (Sames goes for the 4-ton).
  16. Well, I know that's not true, simply because my...

    Well, I know that's not true, simply because my brother has a system like this (Infinity) and doesn't have every zone big enough to handle the minimum load. The Infinity will look for zones that are...
  17. The builder uses vinyl dual-pane windows with...

    The builder uses vinyl dual-pane windows with 270-LowE and Argon. According to the manufacturer's website, the U-value is 0.29 and the SGHC is 0.26, visible transmissibility is 50%.

    I could...
  18. Replies
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    Poll: Here's why I think that statement isn't true: ...

    Here's why I think that statement isn't true: the loads are calculated at extreme conditions assuming semi-steady state conditions, when in fact the loads are a dynamic condition.

    That is, your...
  19. The breakdown of the Manual-J loads shows that...

    The breakdown of the Manual-J loads shows that half the load is coming from windows. So, to get down to 3 tons, I'd have to seriously reduce the amount of windows in the house.

    Couldn't do...
  20. 4100 SF on the lower floor, 1000 on the upper...

    4100 SF on the lower floor, 1000 on the upper floor.

    And, yeah . . . very big rooms. I guess I'm a bit claustrophobic. :D

    The last two houses I've had built, I always have one less room (two...
  21. I'd be extremely surprised to see that zoning...

    I'd be extremely surprised to see that zoning could result in more than a 40% reduction in required load. Especially considering the results (so far) of this poll:
    ...
  22. Can latent capacity be used as sensible capacity?

    Let's assume that a cooling system at design temperature has a total cooling capacity of 49 kBTUH and a sensible cooling capacity of 36 kBTUH, leaving a latent cooling capacity of 13 kBTUH.

    I've...
  23. Replies
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    Poll: My bad . . shoulda put a 0% option in there.

    My bad . . shoulda put a 0% option in there.
  24. Replies
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    Poll: How much does zoning reduce the loads?

    How much are you (as a contractor) willing to reduce your Manual-J load calculations if the house is going to use zoning? Assume more than just the typical 2 zones (up/down). Let's assume say 3 or...
  25. I understand your comments, but after looking at...

    I understand your comments, but after looking at the data for this new product, it seems to me that your concerns won't be as valid for this unit (going from 5 to 4 tons) as it would be for a typical...
  26. My thoughts on this are as follows: I need 750...

    My thoughts on this are as follows:

    I need 750 CFM in heating (comfort mode), and 700 CFM in cooling (comfort mode, dehum or zoned).

    As I understand it, the Infinity system has a setting that...
  27. PS: The load calcs (cooling) by zone are (in...

    PS: The load calcs (cooling) by zone are (in kBTUH):


    Master Suite: 10.6
    Study/Foyer: 4.4
    Dining/Living: 10.2
    Kitchen/Brk/Laundry: 8.3
    BR2/BR3/Bath: ...
  28. These are all COOLING numbers: My smallest...

    These are all COOLING numbers:

    My smallest zone requires 4,425 BTUH. The largest zone requires 10,576 BTUH.

    The total calculated load is 54,327 BTUH. He adds (for reasons I still don't...
  29. Carrier Infinity Variable Speed Heat Pump Product Data is Out

    http://www.docs.hvacpartners.com/idc/groups/public/documents/techlit/25vna-01pd~1.pdf
  30. BTW, the product data for the 25VNA heat pump was...

    BTW, the product data for the 25VNA heat pump was just released:

    http://www.docs.hvacpartners.com/idc/groups/public/documents/techlit/25vna-01pd~1.pdf

    The 4-ton and 5-ton can go down to 693 CFM...
  31. I didn't ask for that, just asked for ACH. ...

    I didn't ask for that, just asked for ACH.

    There's a program I used a few years ago when I thought I was gonna replace my AC in another house (needed to be downsize), and I don't recall it asking...
  32. OK, here's the clarification. That was 1-2 ACH...

    OK, here's the clarification. That was 1-2 ACH at 50 Pascals. Which should translate into about .06 to .13 ACHnatural (by my own estimation).
  33. The reply came back (from his office assistant)...

    The reply came back (from his office assistant) that it was 1 - 2 ACH.

    I think they slipped a decimal, and meant 0.1 to 0.2 ACH.
  34. Replies
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    If geothermal (with the tax credits) WERE as...

    If geothermal (with the tax credits) WERE as cheap as a good HVAC system, then EVERYBODY would be getting them.

    The bottom line is this: all the estimates (expressed as $/ton) I've been given...
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    My experience (different climate, and just...

    My experience (different climate, and just spray-foam in the walls and rafters) is that the BIG reduction in utility bills comes from the insulation/orientation/etc.

    That doesn't leave a lot of...
  36. If it can put out 105F duct temperature at 20F OD...

    If it can put out 105F duct temperature at 20F OD temp, that would be incredible. I wish they'd hurry up and put up ALL the specs on it.

    I'm curious as to how low the CFM will be for the 5-ton...
  37. 5-tons would, indeed, be too small for a house of...

    5-tons would, indeed, be too small for a house of typical stick construction and batt insulation.

    But using spray foam in the walls and spray foaming the rafters (putting the attic inside the...
  38. I strongly suspect that you've hit upon the...

    I strongly suspect that you've hit upon the reason here.

    Either that, or it doesn't work without an Infinity thermostat, perhaps?
  39. I've considered them. The guy who did my Manual...

    I've considered them. The guy who did my Manual J calcs sells geo-systems, as does another fellow I talked to (and he has the BEST installation practices I think I've ever seen . . at least for...
  40. Thanks for the recommendation(s). Do you know...

    Thanks for the recommendation(s). Do you know anything about Joplin Compressor in McKinney. They're very close to me, and seem to deal with the Infinity zoning and even heat pumps, etc. They...
  41. That was his reasoning, as well. Of course, we...

    That was his reasoning, as well. Of course, we tend to keep the blinds closed most of the time, so we'd get some effect from that, too. But, I think he wants to make sure it's designed to handle...
  42. Did you mean to say 25% ABOVE? The way I...

    Did you mean to say 25% ABOVE?



    The way I read the design of the Infinity system, it can actually go ahead and open up a single zone that's airflow limited as long as there are other zones that...
  43. I don't know that for sure. I'll have to ask. ...

    I don't know that for sure. I'll have to ask.




    He designed for 105 in the summer, and 22 in the winter. He showed me the BIN data, but I forget how many hours were above 105. I think he...
  44. I have a hard enough time getting most people to...

    I have a hard enough time getting most people to believe that the spray foam will reduce my requirements to 5-tons for a 5100+ sq ft house. Getting them to want to undersize that further to 4 tons...
  45. Really? When did THAT happen? You mean there's...

    Really? When did THAT happen? You mean there's no way to get a recip compressor on the Infinity system now? It's all scroll?

    My brother just had one installed last year.
  46. I just noticed that this thing (in a 5-ton) can...

    I just noticed that this thing (in a 5-ton) can put out 52,500 BTUH at 17F. Wowza! That's about 10% low to my manual-J calculations, but I suspect that zoning would allow for that much leeway.
    ...
  47. I thought I mentioned that in the first post. :D...

    I thought I mentioned that in the first post. :D

    When do you think I can get a Product Data sheet for it?

    Edit: Never mind, I found it:
    ...
  48. That would be ideal, I suppose. But the trick is...

    That would be ideal, I suppose. But the trick is finding a dealer that actually knows what he's doing when it comes to this kinda stuff.

    I was (thankfully) sent to the load-calculation specialist...
  49. Where to get Carrier Infinity Zone design done?

    I will be starting construction on a new house in a few months in the north Dallas area, and I've decided to get a Carrier Infinity HP/furnace system with zoning. (Sorry, I've consumed the Carrier...
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