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  1. Infinity control set to fixed defrost interval even with communicating outdoor unit?

    I noticed my heat pump going into defrost mode just a few minutes after it cycled on this weekend (I had just arrived and raised temperature at thermostat). Thinking this was a bit odd, I went out...
  2. It might be a hair early to declare success, but...

    It might be a hair early to declare success, but I believe it has healed itself based on power consumption yesterday. Previously usage was spiking above 5 KWH/hour even though it wasn't especially...
  3. I see. I really wondered about the water too,...

    I see. I really wondered about the water too, but after all, heat pumps generally get rained on, right? In all fairness, the outdoor temp was in the 40's at the time and the the fins were already...
  4. Good grief. That is what service company said to...

    Good grief. That is what service company said to do.

    Why is this bad?
  5. I think I can see when this happened from the...

    I think I can see when this happened from the power history. The snowstorm happened on Jan 22-23. Compare electrical consumption from January 19, when it dropped below 10F overnight, to January 23...
  6. Overwhelmed it was, indeed. Even 45 minutes with...

    Overwhelmed it was, indeed. Even 45 minutes with cold water from the hose didn't completely de-ice the coil. As far as operation, it was running quietly when I first got there (and was maintaining...
  7. OK, thanks. It will get to operate over warmer...

    OK, thanks. It will get to operate over warmer conditions over next few days (Highs in 50's and even close to 60 later this week), so maybe that will help it thaw out. Demand should be low since...
  8. Carrier heat pump iced over after snowstorm?

    I have a Carrier Infinity heat pump (two stage communicating outdoor unit) that I found rather iced over yesterday after the snow last weekend. I might downplay the significance of the snow as the...
  9. I had a chance to exercise the system last week....

    I had a chance to exercise the system last week. The zoning seems to work perfectly. (There are only 3 ducts on the upstairs zone, so it's pretty clear from the air flow/noise from the duct when all...
  10. OK, thanks. I will give it a definitive...

    OK, thanks. I will give it a definitive (homeowner) test and check that air can be delivered to each zone independently (and I certainly agree that a "phantom" fault would be fishy).

    The tech did...
  11. I will check more thoroughly the next time I am...

    I will check more thoroughly the next time I am there (may be a week or so). I'm wondering though, wouldn't the duct self-assessment test pick this up?

    Also, I did watch the main thermostat...
  12. The plot thickens... It turns out the fuse...

    The plot thickens...

    It turns out the fuse wasn't blown at all (at least that is what the tech said). Turning power off and on to the system cleared the fault. He ran it through a few tests,...
  13. Ah, very good info to know, thank you. I will...

    Ah, very good info to know, thank you. I will point that out to the tech. It was in cooling mode when the fault occurred, but I had since turned it "off".
  14. Ouch. :( OK, thanks for letting me know. (I...

    Ouch. :(

    OK, thanks for letting me know. (I didn't have high hopes anyway as after all it does plainly say "System Malfunction" right on the control). At least we've got 2-3 weeks before the...
  15. Carrier Infinity 2-Zone system with FAULT 24 - FUSE OPEN

    The full text on the screen is:
    ZN1 (date/time) F24-24VAC FUSE OPEN

    If I were to naively SWAG this, I'd guess something was going on with a zone damper. I have a service call in and they are...
  16. Thanks for the replies. I understood it might be...

    Thanks for the replies. I understood it might be more efficient to keep the compressor running even at 0, but was trying to weigh this versus wear and tear on the outdoor unit. Based on BaldLoonie's...
  17. Wisdom of locking out HP compressor below certain temperature?

    I have a small second home with a 2-ton heat pump (Carrier Infinity 16 SEER, two stage compressor). When I'm there, I heat it with a wood stove, but it is unoccupied much of the time and I leave it...
  18. Dehumidifier repair in Atlanta, GA area? (Thermastor Santa Fe Advance)

    I have a Santa Fe Advance with a leaking evaporator/condenser coil (it's a combined unit). The coil combination is under warranty and Thermastor would ship a replacement on request, but I can't find...
  19. UPDATE: I contacted a Carrier dealer, and they...

    UPDATE: I contacted a Carrier dealer, and they get this question frequently and indicated that with the Infinity you can pretty much set the thermostat as low as it will go (which is 40F) and that...
  20. (Oops - you'd probably have to have the condenser...

    (Oops - you'd probably have to have the condenser model to know for sure -- it's a 25HPA6)
  21. Not sure -- in this case it's a "communicating"...

    Not sure -- in this case it's a "communicating" condenser and I've been told the Infinity control actively manages the defrost cycle. Maybe a Carrier expert here would have the specifics?
  22. Ah, good point -- seems like at least a good...

    Ah, good point -- seems like at least a good reason not to set the indoor temp lower.

    (On the other hand though, 45-50F outdoors is wonderful for getting heat to the indoor coil, so I'd think...
  23. OK for heat pump to run non-stop for days? (colder climate)

    I have a small home recently built that is largely unoccupied during the winter, and I have the heat set on 50F when I'm not there. (Heat pump is 2-ton, 2-stage, 2-zone Infinity heating about 1350...
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    Be sure to get a load calc -- that's a lot of...

    Be sure to get a load calc -- that's a lot of solar exposure via those windows depending on which direction the home will face.

    Also, if the duct work is between the floors, then you're really...
  25. Replies
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    It is (R-8 flex), I just wasn't worried about...

    It is (R-8 flex), I just wasn't worried about heat loss/gain from reduced velocity since it's in conditioned space.

    (To Todd S -- it's not all that bad, just this one supply. It's mainly done...
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    Fortunately, the ducts are basically in...

    Fortunately, the ducts are basically in conditioned space, so hopefully that will eliminate heat transfer as being a significant factor.

    If the elbows stay, they'll definitely be replaced with...
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    We're into the intial install phase and the...

    We're into the intial install phase and the system is not powered yet, but it's by far the most difficult supply register to get air to in the entire system. Even "as the crow flies", with a minimum...
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    It's not so much that they are "stronger" in the...

    It's not so much that they are "stronger" in the center, just that the portion near the center doesn't have much bearing force to transfer to ends. If you think about it, it makes sense -- each end...
  29. Replies
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    Fortunately, there is only 1 hole in each TJI at...

    Fortunately, there is only 1 hole in each TJI at this point, just over the minimum 5' distance from one bearing side. Where the rerouting is required would be about 3' further away.

    (Originally,...
  30. Replies
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    You're right on target. Anyway, the HVAC...

    You're right on target.

    Anyway, the HVAC contractor has acknowledged the mistake -- it was supposed to be a straight run and this was not properly communicated to the duct crew. I'm really...
  31. Replies
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    Move duct and repair TJI's or live with it?

    This is more of a construction topic than specifically HVAC, but I thought there might be some knowledgeable folks here.

    Through miscommunication or whatever, one of my more challenging but also...
  32. Is it really as simple as looking at the...

    Is it really as simple as looking at the "efficiency" of the heat pump itself? At 17F, even if the COP is still 2.5, the heat pump is putting out a good deal less heat than at 47F.

    If the output...
  33. The house is in Macon County, NC. I haven't seen...

    The house is in Macon County, NC. I haven't seen the code, but if you have more than one floor, separate systems or zoning are required (depending on square footage and intended use). I thought this...
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    Some folks in my area heat and cool 2000 sq feet...

    Some folks in my area heat and cool 2000 sq feet with just 2 tons (88F summer, 5F winter)
  35. IMHO, one of the cool things about a variable...

    IMHO, one of the cool things about a variable speed (ECM) blower is that as long as you are within the static pressure limits of the blower, it blows the right amount of CFM (at least if you have...
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    Maybe it's a coincidence, but you checked the A/C...

    Maybe it's a coincidence, but you checked the A/C mode with a 10 degree temperature differential and the heating mode with a 16 degree temperature differential. No wonder there was a difference.
    ...
  37. Replies
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    Two stage systems are very nice, but the price...

    Two stage systems are very nice, but the price differential seems a little high based on some quotes I recently received on Carrier equipment (same parts source as Bryant I have been told)
  38. Replies
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    Dunno if it's still available, but I remember...

    Dunno if it's still available, but I remember Trane having a 2-stage 40K BTU furnace. It put out just over 20K BTU on low fire -- would have been perfect...
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    Issues with the contractor aside, you really need...

    Issues with the contractor aside, you really need a two-stage stat to get the most out of your two-stage furnace.

    You lose most if not all of the benefit of having two separate stages otherwise. ...
  40. Thanks for all the helpful replies. I could tell...

    Thanks for all the helpful replies. I could tell from posts here previously that Infinity zoning was well thought of. (I guess now I know where the name comes from).

    The house is actually really...
  41. The above posts regarding cfm reminded me of a...

    The above posts regarding cfm reminded me of a question I wanted to ask.

    If only 1 zone is calling for cooling, and the compressor is on low, what cfm would you expect the system to instruct the...
  42. Thanks. So, I guess there that means that split...

    Thanks. So, I guess there that means that split between the low and high stages is at 60% of total capacity or so. (I'd seen references to it being has high as 80% with two-stage scrolls so I wasn't...
  43. Opinions on Carrier zoning options (Infinity vs. Comfort)

    I've gotten some competitive quotes where the contractor is offering a choice of Carrier zoning systems.

    They both have variable speed air handlers.

    One is for a single stage heat pump and...
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    I have a Santa Fe Advance dehumidifier which...

    I have a Santa Fe Advance dehumidifier which could actually maintain 50% R.H. in an unsealed 1900 sq ft crawlspace. I've since had it sealed and so the run times are much less, but those are great...
  45. That makes sense. I knew solar gain was an issue...

    That makes sense. I knew solar gain was an issue (also body heat and heat from lighting/appliances, but I don't know if they include the latter).

    I'm getting some real load calcs in and was just...
  46. Are heating and cooling loads "symmetrical"?

    Not sure if this is the right place to ask this, but for the same temperature differential between the indoor and outdoor temperatures, are the heating and cooling loads more or less the same?
    ...
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    The 3 ton cooling quote was based on a 92F design...

    The 3 ton cooling quote was based on a 92F design temp, while the 2 ton (1.5+) was based on 88F. The latter is much more realistic for the area. Most folks don't have any A/C at all.

    I didn't get...
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    Good grief. Talk about mixed information. Now...

    Good grief. Talk about mixed information.

    Now I have a load calc from someone who apparently does a true manual J, and they size the cooling load at 20,000 BTU's at 88F, just over 1.5 tons.
    ...
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    It's true what you are saying about 1500sf to...

    It's true what you are saying about 1500sf to some extent, but the volume of air in the top half of that space is a good bit less than downstairs, probably about 1/2 once you exclude the attic...
  50. Maybe the more interesting question is "why?". I...

    Maybe the more interesting question is "why?". I can see how systems that use two compressors to implement the staging might be configured this way, but with two-speed scroll compressors it seems...
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