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  1. Replies
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    Problem resolved. He replaced coil with correct...

    Problem resolved. He replaced coil with correct one. TXV was correct already.
  2. Don't count on it. You can read more about it...

    Don't count on it.

    You can read more about it on the internet, all I'll say is it doesn't mean anything. We contractors are constantly solicited by BBB and there have been many accusations that...
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    Yes that is a red flag. I believe even a 15 SEER...

    Yes that is a red flag. I believe even a 15 SEER would not qualify for the tax credit, but you don't need to take anyone's word for it. Ask them to give you a copy of the AHRI Certificate for that...
  4. Replies
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    Yes, I looked that up myself before I posted....

    Yes, I looked that up myself before I posted. Just wanted to see if any of the pros here might know something I don't.
  5. Replies
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    1,609

    Goodman A/C coil match

    Having a bit of a "confusion" with my installer. If someone familiar with the Goodman line can comment, I'd appreciate it.

    Installed Goodman SSX16024 A/C and indoor coil. Coil is CAPF1824. If I...
  6. Replies
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    1,820

    I would think your dealer/installer should be...

    I would think your dealer/installer should be able to tell you in minute detail why he chose the one they recommend. And what the differences are. If he can't or won't, then I would look for another...
  7. Thread: Defrost cycle heat

    by dx
    Replies
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    1,326

    This is not a DIY question and there is nothing...

    This is not a DIY question and there is nothing to "do" or take care of. There isn't any specific equipment involved. It's a general "can it be done?" question.

    So I will rephrase it: Do most (or...
  8. Thread: Defrost cycle heat

    by dx
    Replies
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    1,326

    Thanks but neither post explains HOW. I assume...

    Thanks but neither post explains HOW.

    I assume the thermostat does the "locking out" or crossover, so only the HP or the furnace runs at one time, not both. I am assuming a t-stat with crossover...
  9. Thread: Defrost cycle heat

    by dx
    Replies
    14
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    1,326

    Defrost cycle heat

    In a dual fuel system, is there a way to kick the furnace on during defrost so you don't get cold air? I mean, without having to jury-rig your own control board, with umpteen relays and stuff.
  10. Replies
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    1,108

    Skipped, The load requirements were determined...

    Skipped,

    The load requirements were determined largely from the existing equipment, which works fine and doesn't short-cycle. I will do a load calc, but don't expect any surprises.

    As a GC I...
  11. Replies
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    The most common type of controller: ...

    The most common type of controller:

    http://en.wikipedia.org/wiki/PID_controller
  12. Replies
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    1,108

    Heat pump requirements and sizing

    I am replacing a gas furnace/conventional A/C with a dual fuel heat pump. My cooling requirement is 2.5 ton. My heating is 70kBTU.

    I can realize savings running the HP down to about 30F. However,...
  13. Replies
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    864

    Thanks guys. That will work great and a lot...

    Thanks guys. That will work great and a lot cheaper than rewiring.
  14. Replies
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    864

    Thermostat wiring requirements

    Trying to figure out my wiring limitations before I get too far into selecting equipment.

    Current thermostat wiring is a 4-wire cable. Layout is such that it would be expensive to replace the...
  15. Thread: Dual fuel question

    by dx
    Replies
    23
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    1,307

    Help me understand how that can happen. The air...

    Help me understand how that can happen. The air gets cooled and dehumidified as it goes through the coil. Then it hits the heat exchanger, which cannot be at a lower temp.

    You normally get...
  16. Thread: Dual fuel question

    by dx
    Replies
    23
    Views
    1,307

    I didn't quite get that one either. How would it...

    I didn't quite get that one either. How would it cause condensate on the heat exchanger? In heating mode, you would have warm air exiting the coil and hitting the heat exchanger. Granted, the heat...
  17. Thread: Dual fuel question

    by dx
    Replies
    23
    Views
    1,307

    Dual fuel question

    We rarely do dual fuel (heat pump w/gas furnace) in this area, but I have an inquiry for one and my HVAC guy says they normally set it up with a lockout point so only one system is on at a time.
    ...
  18. Replies
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    dan_sw_fl, I think you are missing the point. I...

    dan_sw_fl, I think you are missing the point. I work on a lot of houses where the basement is too cold in the summer. Even with all duct leaks sealed and no registers, I routinely see basements at...
  19. Thread: Motor Drag On Rheem

    by dx
    Replies
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    1,251

    Well, does it still drag with the heavier wire?

    Well, does it still drag with the heavier wire?
  20. Replies
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    Dan, what is the R value of that 3/8" foam? :)

    Dan, what is the R value of that 3/8" foam? :)
  21. Thread: p traps

    by dx
    Replies
    10
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    1,117

    RoBo, hvac contractors around here install a...

    RoBo, hvac contractors around here install a simple, cheap clear PVC line routed in the shape of a trap. Seems to work OK, easily inspected for blockage and easily cleaned and/or replaced.
    I looked...
  22. Replies
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    22,098

    DEC, thank you. Precisely. Just look at it. Just...

    DEC, thank you. Precisely. Just look at it. Just aluminum foil. Aluminum is a good heat conductor, not insulator. Only good for radiant barrier, as aluminum has very good reflectivity.
  23. Replies
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    Bubble foil is radiant barrier and needs airspace...

    Bubble foil is radiant barrier and needs airspace for the R ratings stated. Read the rfoil site carefully. A better product for ducts in the basement is the 6" and 8" fiberglass/foil sleeves...
  24. Replies
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    While you certainly have a number of issues, be...

    While you certainly have a number of issues, be advised that making a return duct by attaching sheetmetal to the bottom of the joists, when done properly, is not an issue. It is called joist spanning...
  25. Replies
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    816

    Yup, the old Cadillac example only proves the...

    Yup, the old Cadillac example only proves the OP's point. The cylinder cut-off is alive and well in several brands today and works perfectly. Cadillac had the right idea with the old V8-6-4, but the...
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    Well of course you get more deposits with hot...

    Well of course you get more deposits with hot water. Hot water evaporates faster, so you evaporate more water, therefore more deposits.
    There is no right or wrong. It depends on what you want/need....
  27. Replies
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    Iginla, you need translation. Some of the pros...

    Iginla, you need translation. Some of the pros are telling you that ducts oversized by 30% and more will work just fine. They are also telling you that the other pros (the ones who claim oversize is...
  28. Replies
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    Read carefully!! Reflectix and other bubble wrap...

    Read carefully!! Reflectix and other bubble wrap like it is primarily a reflective barrier. To achieve the R6 rating they advertise, it needs to be installed with an air space. The air is the...
  29. Replies
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    Wow, BaldLoonie, electricity at 4c per kwh???...

    Wow, BaldLoonie, electricity at 4c per kwh??? Where can I get some?
  30. Replies
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    OK, Superdave, the suspense is killing us! You...

    OK, Superdave, the suspense is killing us! You told us what IT IS NOT. So what IS it? Hmmmm?
  31. Replies
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    We use this type: http://www.reddyheat.com/...

    We use this type:
    http://www.reddyheat.com/
    There are other brands as well. Work well, reliable and can be used outdoors as well as in partially completed buildings. They do smell a bit of...
  32. Thread: New Const. Musings

    by dx
    Replies
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    1,460

    I think he said it's oversized because he only...

    I think he said it's oversized because he only needs 34k of heating on a 95k furnace.
  33. Thread: DENSITY

    by dx
    Replies
    5
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    931

    Read ...

    Read
    http://www.sp.uconn.edu/~mdarre/NE-127/NewFiles/psychrometric_inset.html

    Look at "specific volume" at the very end. Specific volume is 1/density.

    And turn off your caps.
  34. Replies
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    Extech RH390. Had it for years, very happy with...

    Extech RH390. Had it for years, very happy with it. I'm not a hvac contractor, I just use it to check attics, basements, crawls, etc. One of the most accurate pieces I could find at a decent price....
  35. Replies
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    No you should NOT say WORN. You should say...

    No you should NOT say WORN. You should say degraded, failed, broken, replaceitnow, goodbye, sayonara, adios.

    This is common sense. If you exceed the design max of your double-pane window and break...
  36. And you couldn't resist taking a cheap potshot at...

    And you couldn't resist taking a cheap potshot at engineers, could you? Which engineer on this thread provoked you to do that?
  37. Well, I for one cannot let this BS pass. My very...

    Well, I for one cannot let this BS pass. My very first post here ("Locating HVAC expert") was a very curteous, polite request for a referral. Look it up. The very first reply was sarcastic and it...
  38. Replies
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    Good job, baffin. So now you finally understand...

    Good job, baffin. So now you finally understand that MOVs don't WEAR. Or do you?
    Your tires wear. Your brakes wear. That's a normal in-service condition the designer fully expects and accounts for....
  39. Carrier may well not have any legal obligation....

    Carrier may well not have any legal obligation. But from a business perspective, they have a very unhappy customer. They can choose to do something toward his satisfaction or not. If they choose not...
  40. Replies
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    OK, I'll bite. Here is a good article from IAEI:...

    OK, I'll bite. Here is a good article from IAEI:
    http://www.iaei.org/magazine/04_b/04_b_brown.htm

    Quote from the article:

    "Degradation of MOVs

    It is well-known that MOVs experience...
  41. Very simple. He paid a lot of money for a premium...

    Very simple. He paid a lot of money for a premium product. He wants the product to work like a Lexus and be treated like a Lexus owner. Period.

    I am a contractor and I do understand that...
  42. Replies
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    Show me where you learned this.

    Show me where you learned this.
  43. Replies
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    1,248

    I just love it when somebody posts a question...

    I just love it when somebody posts a question with not enough info (or hardly any info) and 100 people try to figure out a scenario that fits. Wouldn't it be easier to have the OP do his homework and...
  44. Replies
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    Daveandjulie, if you don't know something, ask....

    Daveandjulie, if you don't know something, ask. Otherwise you look foolish. Where do you get these preposterous stories?
    No, MOVs do NOT wear out. They simply fail if a surge exceeds their...
  45. Replies
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    udarrell, I've had one of these for 10 years....

    udarrell, I've had one of these for 10 years. Thermo very accurate and calibratable (just crank the whole mechanism over to the correct reading). The hygro was never any good in spite of being...
  46. Replies
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    cem, I agree with everything except the strips....

    cem, I agree with everything except the strips. The OP wants to protect the electronics inside the furnace/ac. Can't do that with plug-in strips. In most places code requires hvac to be hard wired. ...
  47. Replies
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    Carnak, you are right about one thing. Problems...

    Carnak, you are right about one thing. Problems in MI and FL are opposites. So what? Does Carrier only know how to cool and heat houses in Farmington, CT?
    Here is a hint, Carnak. They say it works...
  48. Replies
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    Re: Magic

    Perpetual, you ignoramus! What makes you believe that being located in Michigan has anything to do with understanding the problem, whatever that "problem" may be? Are you under the false belief that...
  49. Replies
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    2,332

    Here we go again with more pathetically ignorant...

    Here we go again with more pathetically ignorant advice. OK, let's review some basics:
    The poster asked for surge protection, not lightning. For lightning protection, use a lightning rod.
    Surge...
  50. I am a contractor (not hvac) and I DO feel bad...

    I am a contractor (not hvac) and I DO feel bad for Dan. I don't expect my customers to put up with this kind of nonsense.
    I would demand either 1. Complete replacement with my choice of equal value...
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