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  1. Static pressure is about 0.35

    Static pressure is about 0.35
  2. I removed the grill and it made no difference. ...

    I removed the grill and it made no difference.

    Note that the size of the opening into the return duct is 13.75" x 24.75" (the border of the grill is 1.25")

    Note: the noisiest ducts are ones...
  3. Let me clarify. The total size of the grille is...

    Let me clarify. The total size of the grille is 16" x 26". The borders are 1.5".
    Hmn, when I take the grille off I will measure the actual size of the duct.
  4. If I have to spend upwards of $1000 (after taking...

    If I have to spend upwards of $1000 (after taking into account the need to re insulate) to really solve the problem, and end up with a bunch of flex that (though it may be silly of me) I don't...
  5. Interesting idea, but that's not something I, the...

    Interesting idea, but that's not something I, the just enough to be dangerous homeowner, want to touch.
    Also, I think that "most installers" is more accurately written as "almost all installers"!
    ...
  6. Somewhat off topic, I had wondered if there was...

    Somewhat off topic, I had wondered if there was some way to keep the unit in first stage more of the time. I am willing to accept a moderate rise (or drop) in house temperature during times where...
  7. I did read that, and wondered why "comfort" ...

    I did read that, and wondered why "comfort" would matter -- so your further explanation is appreciated!

    For AC: Here in Maryland (near DC) the humidity is a real issue (more so than heat). So...
  8. I should note that as an experiment, I had a...

    I should note that as an experiment, I had a "duct muffler" installed on one the ducts (it replaces a 4' section of duct, and was installed near the register). That helped reduce the noise emanating...
  9. I will try, but will be shocked (and pleased) if...

    I will try, but will be shocked (and pleased) if it makes a difference!
  10. 1) In cooling, I set it to "quiet". The...

    1) In cooling, I set it to "quiet". The installation manual says "minimum cooling airflow that the system can safely use (typically 300CFM). Use this setting if duct noise is a severe problem...". In...
  11. More info: 9 ceiling registers, 11x7 edge to...

    More info:
    9 ceiling registers, 11x7 edge to edge (about 9 x 6 internal)
    1 return register: 16 x 26 (13 x 23 internal)
    Return duct: 18" x 18" x 80"
    Main supply duct: 18" x 18" x 80" with 5...
  12. Thanks for the replies. Perhaps some more details...

    Thanks for the replies. Perhaps some more details would help.

    Background: The house is a 1400 sq ft rambler in Maryland. This system replaced an 18yr old 2 ton Seer 13 AC system that cooled...
  13. Noisy grills and Carrier Infinity system, but can't lower fan speed enough

    A year ago I replaced the flex duct in the attic with hard duct, and installed a 2-ton 2-stage Carrier AC/HP (25hnb924a) that uses the Infinity thermostat.
    While the system heats and cools wells, it...
  14. meddlesome homeowners occassionally correct :)

    Can't say as I blame you, but sometimes we (homeowners) spend a lot of time researching a particular system (the one we are gettting in$talled).

    For example, I installed this system in parallel...
  15. pulling vacumn

    Thanks for the tip. It's always a bit of a challenge telling workmen such technical chores (they tend to look at homeowners as meddlesome dopes), but there are ways..
  16. Carrier 24HNB9 compressor failure after 3 months... cause for long term concern?

    Hello.

    Back in June I installed a new Carrier Heat pump (25hnb924A003 -- 2 ton 2-speed 19 seer).

    It worked quite nicely throughout the summer. In September, with the pleasant weather here...
  17. It does get dry in the house in the winter (my...

    It does get dry in the house in the winter (my skin notices it). But the boiler is in the cellar, and the hvac duct work is in the attic, no water up there (the AC was a retrofit when we moved in)!...
  18. The installers weren't that interested in an HP...

    The installers weren't that interested in an HP at all, I kind of had to talk them into it. So their advice has been minimal, I have tried to figure it out.
    BTW: Got an Aprilaire 13MERV, no...
  19. Upon factoring in that feature ... my maybe just...

    Upon factoring in that feature ... my maybe just got a lot more "maybe not" !
  20. Thanks. When next I talk to the contractor I will...

    Thanks. When next I talk to the contractor I will ask for this.
    Or maybe I will be ambitious and try it myself :<>
  21. That sounds like a good solution. I assume the...

    That sounds like a good solution. I assume the existing two wires coming from the boiler would be used -- they would split (before getting to the Infinity tstat); with one pair going to the Infinity...
  22. Yep, the boiler runs on natural gas (been using...

    Yep, the boiler runs on natural gas (been using it for heat since I bought the house in 1992).

    Truth be told, haven't actually used the HP in cold weather (just got it installed in June 2012)....
  23. Almost:, no hydronics in AHU; boiler is used...

    Almost:, no hydronics in AHU; boiler is used below freezing (I have hp set to shut off at oat of 35 degree, at which point the boiler kicks in ).

    The problem with your idea is that 99% of the time...
  24. Which to hook up? Just the fan coil breakers...

    Which to hook up? Just the fan coil breakers (not the condenser breakers)? How to suppress the fan (no need to push air)? Also, the breakers would take up several spaces in the transfer switch sub...
  25. Carrier Infinity and power outages: solutions?

    In May I upgraded my 18yr AC to an Infinity Carrier HPAC (25HNA9). This works with my aging (but still functional) natural gas boiler. An interface relay kit (KFAIF0101HWC) is installed so that...
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