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  1. Replies
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    Please provide the furnace model # you are...

    Please provide the furnace model # you are working on.
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    :cheers:

    :cheers:
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    I found the manual and it has the cabinet...

    I found the manual and it has the cabinet dimensions, so check your email.
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    That is exactly what I am saying. Usually these...

    That is exactly what I am saying. Usually these units are under fired when the CO is within limits, because higher manifold pressures will cause too much flame impingement, resulting in higher CO.
    ...
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    We don't post manuals in this "OPEN" forum, so...

    We don't post manuals in this "OPEN" forum, so put an email in your profile, or send me an email (address is in my profile), and I will get it off to you.

    Side note:

    Low NOx units should be set...
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    All I have is the E and G series (EG6G***). ...

    All I have is the E and G series (EG6G***).

    If you want either of those, send me an email, and I will get it off to you.
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    High CO is not always an indication of a...

    High CO is not always an indication of a compromised HX. It is just a good reason to do a visual inspection.

    Combustion analysis is more than just noting the CO level the unit is producing.
    ...
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    Thanks for posting the model number. This...

    Thanks for posting the model number.

    This 125,000 btuh input unit needs to be moving about 1600 cfm of airflow (130 cfm per 10,000 btuh input).

    Each one of your 6 inch flex ducts will move...
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    I asked for it because I didn't see it before.

    I asked for it because I didn't see it before.
  10. Replies
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    What is the model number of this furnace?

    What is the model number of this furnace?
  11. And please complete your full profile, including...

    And please complete your full profile, including an email address. This will allow us to get requested manuals and specs off to you should the files be too large to upload to the "PRO" site.
  12. Any tech can pull out the combustion analyzer and...

    Any tech can pull out the combustion analyzer and see the CO is high, but only a few know the reason.

    As stated by pecmsg, someone trained to the National Comfort Institute (NCI) standards will...
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    From the manual I have: The High Efficiency,...

    From the manual I have:

    The High Efficiency, eStage option shall provide five stages of mechanical cooling with the ability to be at or below 25% compressor displacement at stage one.
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    Yes, one of those "Big as a House" package units...

    Yes, one of those "Big as a House" package units - see attachment. :)
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    It exists. I have the Parts List and IOM, but...

    It exists. I have the Parts List and IOM, but neither show, or discuss, the louvers on the condenser fans the OP is talking about.
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    Your unit was manufactured in Oct. 2015. In...

    Your unit was manufactured in Oct. 2015.

    In 2014 the warranty for a registered unit was 12 years - see first attachment.

    In 2016, they changed it to 10 years - see second attachment.

    All...
  17. I know that website allows you to find...

    I know that website allows you to find contractors that are certified in areas other than combustion analysis.

    Im hoping you talked to one of them.

    Its still no excuse for not directing you...
  18. This is the typical answer one gets when a...

    This is the typical answer one gets when a contractor/technician is not trained on the significance of combustion testing.

    If you want to find one who knows of its importance, and has been...
  19. Replies
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    Systems will lose airflow over time due to dirty...

    Systems will lose airflow over time due to dirty components within the unit, failing motors, duct work problems, and restrictive air filters.

    It is the techs jobs to perform a series of test to...
  20. Thanks for the update.

    Thanks for the update.
  21. Thanks for the model number. It is the model I...

    Thanks for the model number. It is the model I thought you had.

    Im not sure why your contractor is saying that he can bring combustion air "DIRECTLY" into this furnace, because as I stated...
  22. Put your email address in your profile, and I may...

    Put your email address in your profile, and I may be able to find one to send to you. We don't post manuals or wiring diagrams in this "OPEN" forum.
  23. Yes, the openings allow in combustion air. The...

    Yes, the openings allow in combustion air.

    The model number is most likely inside one of the panels on a placard. The model number would most likely start something like this - TUD or TDD.
  24. You possibly can find it online, I'm just not...

    You possibly can find it online, I'm just not sure. We do not post manual in this forum.

    If I looked up the correct model, it is an 80% efficient furnace. These units do not use a combustion air...
  25. That model draws combustion air from the space...

    That model draws combustion air from the space surrounding the furnace. There is no provision in the installation manual to attach a combustion air pipe directly to this furnace and bring air in from...
  26. It's not really a specialty named contractor, but...

    It's not really a specialty named contractor, but a contractor that have been trained in Carbon Monoxide and Combustion Performance.

    Here is a good place to start searching -...
  27. The burner box pressure is usually higher (less...

    The burner box pressure is usually higher (less negative) than the collector box pressure (more negative).

    The switch closes based on the differential between these two pressures.

    Post the...
  28. Replies
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    Check your mail. I sent you a couple pdf's. Let...

    Check your mail. I sent you a couple pdf's. Let me know if that is what you are looking for.
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    I love level headed homeowners! :cheers: ...

    I love level headed homeowners! :cheers:

    Please keep us posted as to what your technician discovers the problem is. Even we learn from each customers dilemma.

    If you have any questions from the...
  30. Thread: Weird readings

    by rundawg
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    I would agree, but when he has 5 units with the...

    I would agree, but when he has 5 units with the same reading, so there is a meter problem or a Tech problem (he isn't measuring the capacitance correctly).

    From his previous post, we know he...
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    This is exactly how we will tell you to proceed....

    This is exactly how we will tell you to proceed. Getting a qualified tech out at this stage would be the smart course of action.

    A furnace that shuts down after a few minutes, is usually due to a...
  32. Thread: Weird readings

    by rundawg
    Replies
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    1,025

    :cheers:

    :cheers:
  33. Thread: Weird readings

    by rundawg
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    If this is the case, the capacitor is weak and...

    If this is the case, the capacitor is weak and needs to be replaced.

    Note:
    If these 370 volt rated capacitors are measuring 370 volts under load, you need to be switching them to 440 volt...
  34. Thread: Weird readings

    by rundawg
    Replies
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    Check your email too.

    Check your email too.
  35. Thread: Weird readings

    by rundawg
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    "BNME8EZ" already mentioned this, but I will...

    "BNME8EZ" already mentioned this, but I will repeat it.

    The voltage is taken across the "Comm" and "Herm" terminals of the capacitor, and the Amps are measured on the start winding of the...
  36. Thread: Weird readings

    by rundawg
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    Were all the wires disconnected from the...

    Were all the wires disconnected from the capacitor while testing?

    Did you try another meter that measured capacitance?

    Do you know the formula to test these capacitors while the unit is running?
  37. Thread: Weird readings

    by rundawg
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    My first question would be: are you testing the...

    My first question would be: are you testing the capacitors after they are removed from the unit, or while the unit is running?
  38. Thread: Furnace Filter

    by rundawg
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    I'm partly to blame for that too - sorry. I...

    I'm partly to blame for that too - sorry.

    I will also restate what I said in my previous post:

    As far as the filter is concerned, if your system was designed and installed to accommodate that...
  39. Thread: Furnace Filter

    by rundawg
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    Thanks for the model number. Even the...

    Thanks for the model number.

    Even the Technical Specs on that model state the max efficiency is 85% (95,000 btuh input, 81,000 btuh output), so there is no way those techs can say your unit is 89%...
  40. Thread: Furnace Filter

    by rundawg
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    What is the model number of this furnace?

    What is the model number of this furnace?
  41. Thread: Furnace Filter

    by rundawg
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    They are relying on the analyzer to determine...

    They are relying on the analyzer to determine efficiency and not measuring the actual output of the furnace.

    Combustion analyzer calculations are preloaded into the analyzer using a single flue...
  42. Thread: Furnace Filter

    by rundawg
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    I hate to break it to you, but if your tech was...

    I hate to break it to you, but if your tech was reading that 89% efficiency number off his Combustion Analyzer, the number is bogus (not accurate).

    A Non-Condensing furnace automatically looses...
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    Just to add some additional information to what...

    Just to add some additional information to what others have stated about UL listed CO Dectectors:

    A UL listed CO Detector will not alarm until the CO is very high, usually 70 PPM (Parts Per...
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    Here is a good place to search for a qualified...

    Here is a good place to search for a qualified contractor who is trained in Combustion Performance and CO safety - https://www.myhomecomfort.org/why-you-need-a-carbon-monoxide-test/
  45. You are asking this question in the wrong forum....

    You are asking this question in the wrong forum. This forum (AOP Residential) is for homeowners to ask questions.

    Click on the small black triangle at the bottom left of your post and ask the mods...
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    It is on my bucket list. The hanger flying and...

    It is on my bucket list. The hanger flying and war stories are half the fun.
  47. Replies
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    As “ga-hvac-tech” mentioned, this subject has...

    As “ga-hvac-tech” mentioned, this subject has been discussed in the PRO forums before.

    The King of Combustion - Jim D. responded with this:

    My rule of thumb for outside combustion air is you...
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    SEER - 10.0 EER - 9.2 HSPF - There is no...

    SEER - 10.0

    EER - 9.2

    HSPF - There is no such number on this unit, as it is not a heat pump. It uses electric heat strips.

    For the reference, see this webpage to do the manual search -...
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    The couple of these units that I have come across...

    The couple of these units that I have come across have not had issues with refrigerant pressures or airflow that was directly related to the way the unit was set up.

    With that said, maybe a Trane...
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    As stated, if it is allowed it will be described...

    As stated, if it is allowed it will be described in detail in the installation manual as to what the requirements are for such venting.

    I know Trane lists downward venting in their 90%+...
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