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  1. Honeywell Prestige IAQ is the best thermostat. It...

    Honeywell Prestige IAQ is the best thermostat. It can control heat pump, gas furnace, humidifier, dehumidifier, and ventilator simultaneously.

    Are you expecting the HRV to control humidity? It...
  2. Post the combustion analysis findings. Or go...

    Post the combustion analysis findings.

    Or go to the link in my sig and find a tech who has specialized combustion analysis training instead of the guy you had out there with a tool he doesn't know...
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    I use 6" length for each 1" of reduction....

    I use 6" length for each 1" of reduction. Reducing on opposite sides allows for 2" reduction in 6" length.
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    I assume you changed the orifices and the...

    I assume you changed the orifices and the regulator spring in the gas valve and then adjusted the gas pressure. That's to start. A combustion analysis is the best way to make final adjustments....
  5. Site rules do not allow answering DIY questions.

    Site rules do not allow answering DIY questions.
  6. Site rules prohibit giving advice for DIY. My...

    Site rules prohibit giving advice for DIY.
    My sig has two links to locate good contractors.
  7. See post 7. Homeowners are too quick to want...

    See post 7.

    Homeowners are too quick to want to replace a part.
  8. Honeywell Prestige IAQ

    Honeywell Prestige IAQ
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    It appears none of the techs or the installers...

    It appears none of the techs or the installers did a full commissioning. A full examination should be performed instead of just fiddled around, checked pressures.”
    Air flow, static pressure,...
  10. Why not just use a thermostat that can control a...

    Why not just use a thermostat that can control a ventilator and uses lockouts for temperatures above and below temperatures that the user can adjust?
  11. That is marketing. Until their claims have been...

    That is marketing. Until their claims have been confirmed and we can see that it will work in an air stream comparable to residential system velocities, I won’t suggest it to customers.
  12. I do not dispute that UV rays will sterilize...

    I do not dispute that UV rays will sterilize viruses. They do so when the exposure is sufficient. My argument is that a lamp in a duct does not provide sufficient exposure. No study of residential UV...
  13. The techs are idiots. They measured the return...

    The techs are idiots. They measured the return duct and the supply duct.
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    Because they don’t measure anything and can only...

    Because they don’t measure anything and can only replace parts.
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    Microbial growth. Ductless systems are a moisture...

    Microbial growth. Ductless systems are a moisture rich environment.
  16. Negative pressure cannot open a spring loaded...

    Negative pressure cannot open a spring loaded exhaust damper. Ever. Not weird science, dumb science on the part of the installers.
  17. The air flow is inadequate so the limit sensor...

    The air flow is inadequate so the limit sensor opens and interrupts the 24V.
    Have a tech measure static pressure and you'll see.
  18. ^^^^^ That. Except TOO hot.

    ^^^^^ That. Except TOO hot.
  19. I haven’t had the time to check again. We’ve been...

    I haven’t had the time to check again. We’ve been swamped.
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    Here is a definitive article about velocity by...

    Here is a definitive article about velocity by Allison Bailes from his energyvanguard.com blog posts.
    https://www.energyvanguard.com/blog/best-velocity-moving-air-through-ducts
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    As you have found, a good decision on a heating...

    As you have found, a good decision on a heating system should involve plenty of diagnosis and planning rather than a decision under pressure.
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    How can the humidifier add humidity to the air if...

    How can the humidifier add humidity to the air if no air can get to it? :gah:

    Additionally, it should only operate when the furnace blower is on. Things aren't looking good at this point.
  23. I agree with your procedure if you are willing to...

    I agree with your procedure if you are willing to spend a lot of time and money without any assurance of fixing it.

    I disagree if you want it resolved correctly and want it operate as efficiently...
  24. You should insist that the installers perform a...

    You should insist that the installers perform a combustion analysis to properly commission the furnace. Just waving a CO sensor around does not assure correct adjustment. Neither does "nice blue...
  25. The problem with changing temperatures is that...

    The problem with changing temperatures is that although the air temperature is brought back to the occupied setting, the surfaces in the house take hours to return to the daytime temperature. The...
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    We bought a used one a couple of years ago. We...

    We bought a used one a couple of years ago. We have only used it a couple of times. It makes great cuts.
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    It may be that you didn't configure it correctly...

    It may be that you didn't configure it correctly after the installation.
  28. Honeywell Prestige IAQ can control 3 stages of...

    Honeywell Prestige IAQ can control 3 stages of heat, 2 stages of cooling, dehumidifier, humidifier, and ventilator, all with just two wires to the thermostat location. It is also user friendly.
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    Or any measurements

    Or any measurements
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    A combustion analysis will provide a lot of...

    A combustion analysis will provide a lot of useful information. If youíve been in the trade 15 years and havenít taken the training, I strongly recommend you take the NCI class. It is an eye opener.
  31. The installation manual covers all the settings....

    The installation manual covers all the settings. I’m not familiar with the T10. We use the Prestige for high end dual fuel systems and an Aprilaire t’stat with an outdoor sensor for basic dual fuel....
  32. I have used dye on split systems depending on the...

    I have used dye on split systems depending on the situation. Mitsubishi does not approve use of dye so I have never used it in them.
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    Start with a blower door test to measure and...

    Start with a blower door test to measure and identify the leaks in the house. Then make reasonable improvements to tighten the house. That does NOT mean piling on more insulation and replacing...
  34. UV is indeed effective in commercial HVAC...

    UV is indeed effective in commercial HVAC applications, as well such things as sterilizing medical instruments. My objection is to the implication that if it works in those instances that it will...
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    I get the impression you're watching videos on...

    I get the impression you're watching videos on how to fix your furnace. Your description is of something far worse than something that needs cleaning or a new part. This site does not provide DIY...
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    The furnace does not come "pre-adjusted" for your...

    The furnace does not come "pre-adjusted" for your house and duct system, so YES, this could be related.
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    Insulation is NOT air sealing. Air sealing should...

    Insulation is NOT air sealing. Air sealing should be performed prior to insulation. In your house it was not.
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    Yes, it is that bad. Framing is not air tight and...

    Yes, it is that bad. Framing is not air tight and fiberglass is not air tight either.
    The use of building cavities as returns has been around for a long time as a cheap method of routing return...
  39. I don't know if your Goodman furnace needs their...

    I don't know if your Goodman furnace needs their proprietary Comfortbridge controller. Your contractor should know the appropriate thermostat. Most high end equipment makes use of all the features...
  40. That's where inverter equipment comes in by...

    That's where inverter equipment comes in by virtue of load matching. It uses built in algorithms. Most people don't want to enter lots of parameters to control their system. They just want to be...
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    Normal behavior

    Normal behavior
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    The manuals should have been left by the...

    The manuals should have been left by the installing contractor. If they can’t be found, check online.
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    Forget finding a manual and forget error codes....

    Forget finding a manual and forget error codes. They aren’t for the homeowner.

    Electric furnaces aren’t very complicated compared to high efficiency gas furnaces. A good technician should be able...
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    X3

    X3
  45. Look into an inverter sytem, ducted or ductless....

    Look into an inverter sytem, ducted or ductless. The beauty of it is Load Matching.
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    The Navac battery flaring tools are fantastic.

    The Navac battery flaring tools are fantastic.
  47. Dump the home warranty. Is is NOT an insurance...

    Dump the home warranty. Is is NOT an insurance company, as many victims think. Hire a good contractor to look things over.
  48. That’s a lot of duct work for a Mitsubishi. What...

    That’s a lot of duct work for a Mitsubishi. What static pressure did your designer use? From what I understand the Mitsubishi ducted units are only capable of about .2” WC.
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    What you are asking falls into the DIY category....

    What you are asking falls into the DIY category. Site rules prohibit giving such advice.
    This is something your on site technician can address.
  50. Installers are NOT designers. Be prepared for...

    Installers are NOT designers. Be prepared for uneven delivery and temperatures.
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