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  1. Replies
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    Right. I get it. You don't want someone coming...

    Right. I get it. You don't want someone coming here and getting a tutorial for installing their own HVAC equipment. But use your head for a second - I am an engineering professional with a...
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    Brilliant idea. So glad I posted here so you...

    Brilliant idea. So glad I posted here so you could point that out to me.
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    This furnace does not have cooling, and it is...

    This furnace does not have cooling, and it is located such that a condensate spill will likely flow into a finished space. Having a failsafe would be a good thing.
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    Frozen pipes are not a problem where I am located.

    Frozen pipes are not a problem where I am located.
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    Condensate pump cutoff switch wiring

    I am working with a newly installed Rheem Comfort 90+ 2-Stage furnace with a Beckett CB151UL condensate pump. The pump was installed without its failsafe switch wired into the furnace (those 2 blue...
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    Sounds like solid PVC might make sense. However,...

    Sounds like solid PVC might make sense. However, it's curious that both the manufacturer's spec and the local code allow cellular PVC, cellular ABS, and one or two other materials, in addition to...
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    Understood. However, isn't a direct vent a...

    Understood. However, isn't a direct vent a non-pressure application? I mean, the end of the pipe is open, and the furnace must have some sort of a pressure cutoff switch in case it becomes blocked,...
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    You can read my contractor's mind? :eek: Amazing....

    You can read my contractor's mind? :eek: Amazing.

    Actually, it has nothing to do with his warranty. He would tell me straight if it was. I think he's just a bit green in his experience and may...
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    :p If I had either a front lawn or storage room,...

    :p If I had either a front lawn or storage room, that might be an option.
  10. Replies
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    Using PVC for exhaust?

    I have a question about using PVC pipe for gas furnace exhaust.

    A plumbing project left me with some lengths of schedule 40 PVC pipe, which I would like to get rid of on my direct-vent install. ...
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    how big should the supply plenum box be?

    75K high-efficiency upflow unit. No A/C. 16.5x20" opening. I need ~300 sq. in worth of supply.

    Square ducts, so it can come mostly off the top if the sides angle outward into a 22x20 top. ...
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    The gas contractor came and went in 3 hours and...

    The gas contractor came and went in 3 hours and used a mechanical mole to tunnel the 30' line. Total damage to my yard was 3 square feet of displaced sod, which they replaced. Cost me $80 in fees...
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    1) In order to get the line put in for free,...

    1) In order to get the line put in for free, which is now done, I had to commit to 2 gas large appliances.
    2) Definitely don't need A/C
    3) Don't want the giant wart in my yard.
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    Both. We have an unheated, insulated and vented...

    Both. We have an unheated, insulated and vented crawl space that's under ~30% of the first floor - the heated basement is under the remaining 70%, and much of its ceiling is insulated. I made sure...
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    Perhaps. The basement has a laundry, TV room,...

    Perhaps. The basement has a laundry, TV room, and guest suite. It certainly does not need a morning recovery from the overnight low unless someone is staying down there - otherwise the whole space...
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    ~400. Currently air heated partially finished,...

    ~400. Currently air heated partially finished, on it's way to being fully finished and insulated. Two 220/30A circuits for electric heat available there, and perhaps preferable since that space is...
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    How about if we look at it this way: The...

    How about if we look at it this way:

    The locomotive is delivering roughly an effective maximum 82K BTUs, which is just about the same as a new 90K @ 92%. I have 7 runs in the house, and...
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    I have not had a blower test done, nor do I think...

    I have not had a blower test done, nor do I think I will, but I selected the leakiest setting that HVAC-Calc would allow. IIRC, that's 1.2 ACH.



    This is exactly what I assumed one would need...
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    How reliable is HVAC-Calc Residential?

    Kind of following up on an earlier thread with a slightly different question.

    I could not find a contractor willing to do a load calc for me, nor do I have the patience to screen them, so I did my...
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    Wow, I did not realize that the smaller one would...

    Wow, I did not realize that the smaller one would be quieter. I just assumed an automotive analogy - an idling V8 is quieter than a screaming 4 cylinder.

    So, the 75 is available with 3/4HP or...
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    So, I decided to do my own load calculation,...

    So, I decided to do my own load calculation, since this will also allow me to see the efficacy of insulation in terms of BTU dollars.

    I bought a copy of HVAC-Calc Residential since it seems to...
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    We're most often between 45 and 75, although the...

    We're most often between 45 and 75, although the rare historical lows are in the 20s. We had a handful of those this past year. High is not a consideration since there will be no AC. The ducts are...
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    I did. Pacific NW. The other thing worth...

    I did. Pacific NW. The other thing worth mentioning is that my house lacks any insulation and has single pane windows (typical for my area). This will get corrected eventually, but I am nowhere...
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    I used a formula that the building department...

    I used a formula that the building department provides. It's been written just for our area. Its number seems to be consistent with the equipment that my neighbors in similar houses have installed....
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    Thanks, but that's easier said than done. As I...

    Thanks, but that's easier said than done. As I mentioned, I talked to many "qualified" companies, and none of them felt it was necessary. They just sized up the basement and gave me a figure.

    I...
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