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  1. Okey dokey...no offense taken. I've been...

    Okey dokey...no offense taken. I've been cleaning filters for years with no problem and I do replace them regularly...just not every 40 days. With that quick a filter load up, I would check the...
  2. Consider having your duct system cleaned, and it...

    Consider having your duct system cleaned, and it is possible to gently vacuum filters to remove some of the trapped dust and get further useful life.
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    [QUOTE=JakRabbit;10422792] Air return in the...

    Air return in the basement which is always at least 5-10 degrees lower than the main floor causes that low RAT. The only other air returns are on the main floor and these two are very close...
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    Problem solved finally! A fourth AC tech came...

    Problem solved finally! A fourth AC tech came out and he was much more knowledgeable about the XC21. He checked the pressures and charge using the Approach method and determined that the previous...
  5. I have the SLP98 and the XC21 with both the DAS...

    I have the SLP98 and the XC21 with both the DAS and the OAS installed.

    The DAS allows the system to monitor the actual temperature of the SA and keep it even during heating. So you get move...
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    As I said...

    As I said...
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    Also...check out the brokerage fees, duties and...

    Also...check out the brokerage fees, duties and taxes. I agree that price differentials can be surprising, but the US market is MUCH larger and economies of scale come into play. When I needed a...
  8. It isn't only about personal savings...it is also...

    It isn't only about personal savings...it is also about reducing the load on the energy grid, the use of resources and pollution.
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    Thanks Marty! I will ask a few questions come...

    Thanks Marty! I will ask a few questions come Monday and confirm that there was a reason the tech set the subcool where it is...also that it is 11 and not 23. I will also ask why the subcool was not...
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    Well, I may have to call to confirm, but I...

    Well, I may have to call to confirm, but I believe the subcool was 23 originally and then was set to 10-11. Is that possible when he added refrigerant to bring the charge up?

    So, if it is...
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    Anyone?

    Anyone?
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    The other question I have is to do with the...

    The other question I have is to do with the subcooling spec from Lennox:

    SUBCOOLING
    TEST AND CHARGE METHOD
    65F (18.3C) and Above
    * These subcooling values are also listed on the unit charging...
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    Okay...service tech has adjusted our AC. First...

    Okay...service tech has adjusted our AC. First we needed to clean the MERV 16 filter as airflow was restricted. He then confirmed that the system was a bit undercharged and added refrigerant.
    ...
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    Okay...after 2 service calls I have more...

    Okay...after 2 service calls I have more information on the problem (411: low pressure switch strikes lockout).

    It turns out that none of the techs here have worked on the XC21 before. Any help...
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    Thanks very much Marty...I will try disabling the...

    Thanks very much Marty...I will try disabling the stage delay timers so the XC21 runs in first stage without extra dehumidifcation. A very helpful suggestion...particularly when the cooling load is...
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    Thanks TB...I will look into it once I determine...

    Thanks TB...I will look into it once I determine if the DEHUMID function of the XC21 cuts the mustard.
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    The following is in my iComfort manual (12/2010)...

    The following is in my iComfort manual (12/2010)

    "DEHUMIDIFICATION modes
    NOTE − Basic and Precision dehumidification modes are functions of the
    HVAC system with NO external dehumidification...
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    Thanks

    Thanks
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    So, the system will override the cooling demand...

    So, the system will override the cooling demand CFM if a dehumidification demand exists at the same time?
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    Thanks!

    Thanks!
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    Okay...that's helpful: max the dehumidification...

    Okay...that's helpful: max the dehumidification rather than the cooling, which would mean drop the airflow from the max cooling airflow. So, perhaps the iComfort does this automatically.

    What is...
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    Lennox iComfort AC settings

    I have the Lennox XC21 (3T) with the SLP98 and the iComfort thermostat installed. Now apart from the fact that the installer has to come and service the brand new XC21 due to a botched install (low...
  23. HeyBob: I'm confused...I also posted a copy of a...

    HeyBob: I'm confused...I also posted a copy of a PDF quick start guide. Was the problem the presence of an internet address within the PDF document?

    My apologies and thanks for any clarification,...
  24. I have the icomfort Touch and also am very happy...

    I have the icomfort Touch and also am very happy with it. The only reference I have found to the internet weather features:. The icomfort (not the touch model) has a quick start guide (attached)...
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    Hey...everyone knows that cheaper is the way to...

    Hey...everyone knows that cheaper is the way to go: buy a poorly butchered cut of stewing beef for your barbeque dinner and then enjoy tough, inedible meat filled with bone chips.
  26. I'm not a pro...but a few suggestions: Sounds...

    I'm not a pro...but a few suggestions: Sounds like your thermostat is set to auto heat & cool. You should be able to turn heat off completely by a thermostat option setting. Alternately, drop your...
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    Well...actually, the owner can vary the speed...

    Well...actually, the owner can vary the speed with the appropriate knowledge in some cases. I have a Lennox SLP98 furnace with the icomfort thermostat and have adjusted the CFM and DAT by referring...
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    Right on! Ventilation is absolutely necessary as...

    Right on! Ventilation is absolutely necessary as the build up of methane gas can lead to very dangerous conditions: I've witnessed a cow barn go up in flames from an electrical spark.
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    If it ain't broke, don't fix it...but if it is...

    If it ain't broke, don't fix it...but if it is broke, keep tryin' to fix it better.
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    The contractor is correct that it is often done...

    The contractor is correct that it is often done that way...but that is not the correct way to do it. I discovered an old ducting renovation in our house years after we purchased it: a middle bedroom...
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    I am not a pro, but this sounds like nonsense. ...

    I am not a pro, but this sounds like nonsense. Do a quick survey of meter placement in your neighborhood...are the meters installed at the front of the houses? When the supply line is at the rear...
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    As long as they do the survey on a very windy day...

    As long as they do the survey on a very windy day and carry a supply of kleenex for draft testing...the home owner should get a very accurate rating of the number of air changes per hour. :grin2:
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    Please read the site rules...no pricing in posts.

    Please read the site rules...no pricing in posts.
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    Permanent-split capacitor (PSC) motor (also known...

    Permanent-split capacitor (PSC) motor (also known as a capacitor start and run motor)

    ECM (Electronically Commutated Motor)

    http://en.wikipedia.org/wiki/AC_motor
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    I am no expert, but there are many factors at...

    I am no expert, but there are many factors at play: duct loss will be less at lower speeds as it is proportional to air speed...no? Turn your hot water tap on at half flow: it takes longer to reach...
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    P.S. DYI means "Do Yourself In.":grin2:

    P.S. DYI means "Do Yourself In.":grin2:
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    Interesting thread...and I sure am glad none of...

    Interesting thread...and I sure am glad none of this is DYI.:angel:
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    I don't think I'd call it overkill. Both units...

    I don't think I'd call it overkill. Both units will serve well when properly sized and if you do a comparison on the Lennox site, you will see the advantages to the XP21 have to do with higher SEER,...
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    SLP98 & XC21 Engineering Handbooks?

    Does anyone know where I can get copies of these documents?
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    Quite right..I can only speak of my own...

    Quite right..I can only speak of my own experience: I had no problem acquiring the Lennox manuals beforehand. This site was also helpful in tracking them down. Any contractor refusing to provide...
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    Okay, one more factor in a reliable, quality...

    Okay, one more factor in a reliable, quality installation: an informed homeowner who studies the entire installation process beforehand (it is not hard to get a copy of the install manuals online),...
  42. I like my Lennox SLP98 with icomfort stat (fully...

    I like my Lennox SLP98 with icomfort stat (fully modulating and communicating)...but you've already got a number of choices.
  43. On the Lennox icomfort tstat, the DATS allows the...

    On the Lennox icomfort tstat, the DATS allows the use of "Fixed DAT" Heating Airflow Control. The low and high heating discharge air temperature can then be adjusted and monitored to maintain more...
  44. I enjoy fixing...:cheers:

    I enjoy fixing...:cheers:
  45. My thought exactly...and at 35% firing, the only...

    My thought exactly...and at 35% firing, the only way the furnace could raise DAT would be to decrease airflow over the heat exchanger. Thus, the only way the "Fixed DAT" mode can provide the "even...
  46. Okay...this must be new territory working out the...

    Okay...this must be new territory working out the icomfort/SLP98 airflow control relationship. So here are my latest findings:

    Setting Low Heating DAT to 135F does not seem to result in much...
  47. The link above appears to be broken. This is the...

    The link above appears to be broken. This is the link you wanted?

    http://hvac-talk.com/vbb/showthread.php?t=258262&highlight=determining+ductwork+handle+system
  48. Of course...I am in agreement; hence my play on...

    Of course...I am in agreement; hence my play on the word "pressure." :yes:
  49. It appears from my investigations that the way to...

    It appears from my investigations that the way to get a higher CFM with the "Fixed DAT" mode is to decrease the temperature setting. With the low temp set to the default of 125F, the blower runs at...
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    Generally, the purpose of the trap is to use a...

    Generally, the purpose of the trap is to use a column of condensate to prevent air moving into or out of the equipment while still permitting the condensate to drain away. The vent on the line must...
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