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  1. Replies
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    There is a jumper that must be present on the...

    There is a jumper that must be present on the furnace control board. I don't remember which contacts it is for sure. I think it's in the manual, but it doesn't exactly jump out at you in the setup....
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    Let's Talk About Setbacks

    Say we have two days in a row, identical conditions (temp/humidity/thermostat set points, etc.) From purely an electrical consumption standpoint, which situation is better (assume "sleep" and "wake"...
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    Also, I had to disconnect a 12" return to make...

    Also, I had to disconnect a 12" return to make room for the 16" return on one side of the plenum due to a pier under the house being in the way. So now I actually have less return area for the...
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    I should qualify that my system has very short...

    I should qualify that my system has very short runs, both supply and return. It has probably made it easier than most others would find to solely increase my cross sectional area in ducts and reap...
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    I promised you my story, so here goes: I had...

    I promised you my story, so here goes:

    I had an identical furnace to key1cc installed about a month ago. Load calcs (performed by myself because I was unwilling to shell out nearly 4 figures for...
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    I've a story to tell about my install that you...

    I've a story to tell about my install that you may find interesting. It's not directly related, but based on some of your duct dimensions, it could be helpful. I'll post it when I get home from...
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    You should take time off work to be there...

    You should take time off work to be there watching the install, if necessary. Most guys in this trade aren't in business to do perfect installs, they're in business to make money. If they can get...
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    Depends on what you paid in taxes. Also, I think...

    Depends on what you paid in taxes. Also, I think I read somewhere that you can split the credit amount between 2009 and 2010 if you wish. Don't quote me on that. Best to talk to a tax...
  9. I'd recommend using the HVAC Calc program. I...

    I'd recommend using the HVAC Calc program. I couldn't find anyone that would do a load calculation and duct sizing without a hefty fee in Birmingham (when I say hefty, we're talking numbers...
  10. I have 1600 square feet in Birmingham and I...

    I have 1600 square feet in Birmingham and I pretty much need a 4-ton for cooling.
  11. If you're dealing with Leigh, he had no problem...

    If you're dealing with Leigh, he had no problem writing model numbers on my quote when I asked for them.
  12. Pretty sure he's talking about the BTU output of...

    Pretty sure he's talking about the BTU output of the furnace quoted.

    Yours is rated for an output of 82,000 BTUH in 1st stage, 125,000 BTHU in 2nd Stage.

    For a comparison, in my 4-ton system,...
  13. A/C and gas furnace replacement. No heat pump. ...

    A/C and gas furnace replacement. No heat pump. We really like gas heat in the old house. And I'm not quite able (or willing I guess) to shell out enough money for the 16 Seer units, so we're doing...
  14. Heh I had the same unit quoted for my house in...

    Heh I had the same unit quoted for my house in Carrier. Bet it was the same dealer.
  15. If you haven't tried Evans yet, I strongly...

    If you haven't tried Evans yet, I strongly suggest you get a quote from them. Ask to speak to Leigh, and let him know you care enough to research more than the average Joe.
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    I suppose there will be some features that are...

    I suppose there will be some features that are not used or unavailable, but I'll let you know. I mostly just want 7-day programmablity. If that's a word :)
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    Thanks for the tip, he's checking on pricing for...

    Thanks for the tip, he's checking on pricing for me.

    Said he is going to provide the 900 thermostat too :D

    Easily the best dealer experience so far!
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    Am thinking we'll probably go with: Furnace: ...

    Am thinking we'll probably go with:

    Furnace: TUH2C100A9V4VA
    A/C: 4TTB3048
    COIL: 4TXCC049

    Even with the better suited coil, I'm thinking it will take longer than we will be in...
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    Due to costs, I am probably leaning toward the...

    Due to costs, I am probably leaning toward the quoted arrangement with the 15 seer a/c (after I get him to change the coil to 5-ton). It would be hard to swing the 16 seer unit I think. I'll ask...
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    So I figured out that the 15 Seer A/C isn't...

    So I figured out that the 15 Seer A/C isn't matched with that 4-ton coil, it should be matched with the 5 ton coil.

    I'll have to get him to change that.
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    Ouch $$$$ And I would have to stay with at...

    Ouch $$$$

    And I would have to stay with at least this furnace?

    That will probably be more than we can afford.

    I guess I'll play around with a furnace alternative for the 13 and 15 seer a/c. ...
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    So with Trane, I would probably need the XL16i,...

    So with Trane, I would probably need the XL16i, model 4TTX6048B?
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    He also proposed A/C 4TTB3048, with the same...

    He also proposed A/C 4TTB3048, with the same furnace and evap coil.

    I just looked up the combos on AHRI.


    With 15 SEER:

    EER 11.20
    SEER 13.75
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    It says 1300-1450 for the low and medium-low...

    It says 1300-1450 for the low and medium-low settings on high stage. If that is the case, do you think that duct arrangement will work alright?

    The goal in the duct work is to take a partial load...
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    Loads We prefer it cool in the house :D

    Loads

    We prefer it cool in the house :D
  26. Replies
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    other cfms

    other cfms
  27. Replies
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    Fair enough I was just looking at the spec sheet...

    Fair enough I was just looking at the spec sheet for the furnace and chose the most possible cfm for it. I guess in reality it would be set on low or medium for my area (1400 or 1650 cfm in second...
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    Thanks! So it won't be nominated for wall of...

    Thanks!

    So it won't be nominated for wall of shame?
  29. Replies
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    CFM from HVAC Calc The total CFM is based on...

    CFM from HVAC Calc

    The total CFM is based on the second stage high setting for the furnace. Worst case scenario I think (max cfm)
  30. Replies
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    HVAC Calc has all the supplies to each room...

    HVAC Calc has all the supplies to each room needed at either 7" or 8" round. Everything existing is pretty much 8", with dampers.
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    Also I may regret this, but here are some photos...

    Also I may regret this, but here are some photos of current.

    Slide 1 is the 8"x18" trunkline as it goes to the back of the house, and existing return duct to back of house.

    Slide 2 is where the...
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    I don't mind discussing the process if you have...

    I don't mind discussing the process if you have any questions, ask away.

    beenthere, what do you think of the proposed diagram?

    This company has agreed to that work and is quoting the Trane...
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    I am assuming he won't propose it, and if he...

    I am assuming he won't propose it, and if he does, from what you have told me I will tell him I want 8". :D

    Does that seem like a reasonable setup, or is it a mess?

    Taking pictures now. I...
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    Roughly proposed, from contractor 2. (Still...

    Roughly proposed, from contractor 2. (Still haven't got quote)
  35. Replies
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    Fair enough. I'm trying to draw a diagram that...

    Fair enough. I'm trying to draw a diagram that will show the layout of the supply, but I'll probably have to get home before I can upload it. Unless this works.

    That's existing.
  36. Replies
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    He may be talking about changing to two 8" rounds...

    He may be talking about changing to two 8" rounds instead of the one to each room. I'm still waiting on the quote to be sure, but he's been pretty helpful and if I insisted on something he'd listen....
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    There are (I believe) 8" round existing. He is...

    There are (I believe) 8" round existing. He is proposing to replace one 8" round to a single register with two 4" round to 2 registers (he is adding a register in each room). He hasn't provided me...
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    Also, there appear to be dampers on all round...

    Also, there appear to be dampers on all round supply ducts whether they are a spider leg from air handler or a branch off the trunkline.
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    The Plot Thickens... So I had a 6th and final...

    The Plot Thickens...

    So I had a 6th and final quote, and the guy quoted Trane equpiment for a pretty good price.

    Through this process I have started to understand the construction of my home a...
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    For the record, my 6th quote today was probably...

    For the record, my 6th quote today was probably my best. Signifcantly less up front cost for a system where the furnace qualifies for the tax credit, and is a respected, in my opinion, brand name...
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    I agree time is not free. Much the same as the...

    I agree time is not free. Much the same as the time I take off work to meet these contractors. I'm sorry if some people are wishy-washy, but its a big investment and I'm taking my time. I think...
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    Although I think 13 contractors is a bit much, I...

    Although I think 13 contractors is a bit much, I disagree about it being more convoluted. I had my 5th today and will do number 6 tomorrow, and if anything, I am better suited to give them what they...
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    So to recap, I will be getting the following: ...

    So to recap, I will be getting the following:

    A/C: Bryant 123ANA048000
    CC: CNPVP4821ATA
    FURNACE: Bryant 340AAV048080 (possibly 350AAV if shipped from factory)

    The company is going to replace...
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    So the contractor now tells me that he can get...

    So the contractor now tells me that he can get the 4-ton furnace at 74,000 BTU output, but it will pretty much cost the same as he would have to order it directly from the factory. He also mentioned...
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    Thanks a lot for the input! I think, especially...

    Thanks a lot for the input! I think, especially if I put a few more inches of insulation in the attic, the 74,000 BTU furnace should be plenty.
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    One more question then I'll leave you alone. I'm...

    One more question then I'll leave you alone. I'm not real clear on how furnace sizing works. I think I have to have at least a 4-ton blower capacity to match the A/C sizing? If you are familiar...
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    Although we live in heat pump territory...

    Although we live in heat pump territory (Birmingham, AL), I worry that it would be less than adequate in a 100 year old house. There is attic insulation and storm windows, but no insulation in the...
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    The A/C is 4-ton currently. It keeps the house...

    The A/C is 4-ton currently. It keeps the house cool, but there are some issues in the back. The contractor I am thinking I will use says the ducts are too small for the 4-ton unit, and has quoted...
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    So if he's quoting a 110,000 BTU input furnace...

    So if he's quoting a 110,000 BTU input furnace that's more than 90% efficient, I should expect a BTU output of ~99,000 BTU?

    If that is the case, and I currently have a 100,000 BTU input furnace...
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    That was one of the main reasons I think I'll use...

    That was one of the main reasons I think I'll use this contractor. He told me pretty much what you did with regards to the lower end system and new ducts vs a high end system only. Although, I...
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