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  1. #66
    Join Date
    Nov 2009
    Location
    Kansas City
    Posts
    124
    The filter is not the problem. If he has been using the same one for years he has a separate issue. The furnace needs at least a 1/2 hs motor and u need to set the speed to medium high for heat. The home owner needs to call a reliable company and get a REAL TECHNICIAN over there

  2. #67
    Join Date
    Nov 2009
    Location
    Kansas City
    Posts
    124
    My family has a company in Hvac company in KC and we are a premiere Lennox dealer. I would be willing to help you take care of your problem if you would like. You can email me at
    <Email addresses are not allowed in post, please put it in your profile, thank you.> and I will give you my contact information.
    Last edited by beenthere; 12-31-2012 at 05:25 AM. Reason: email

  3. #68
    Join Date
    Dec 2007
    Posts
    4,702
    Quote Originally Posted by udarrell View Post
    I Got the furnace specs.
    That 125 number is the Input, not the Output on that Lennox Brand of equipment.

    Usually a 1/2-HP motor won't quite deliver 1400-CFM; marginal HP even at .50" ESP. CFM if the furnace output is 100,000-Btuh Output.


    Listed Temp-rise is 45-65-F. | using Max 65-F temp-rise * 1.1 is 71.5; 100,000-Btuh / 71.5 is 1398.6-CFM or, I'd say, 1400-CFM. However, the duct system will probably be will above .50" ESP lowering the CFM.

    With your duct system & filter, It would need the jumper to run on the high speed in heating mode; unless cooling mode could use a lower speed.

    Make sure they check the wiring of the capacitor...

    Blower data: I believe that model calls for a 3/4-HP motor which would deliver 1405-CFM at .70" ESP; which I'm betting your duct system would have.

    Just my tentative view of the situation from here...
    what is your concern with the cap wiring? he did not mention brn/white and brn only purple and the motor speed taps and the info provided makes it wired correctly, except for the heat speed.

    so you are asking the factory motor be switched based on the static pressure?

    I am willing to bet, with the work done and pictured, they do not know how to check that.

    not that we/he knows, but why alter the motor size based on ASSUMED data? unless someone can test properly and interpret the data, using the motor specified by mfr would be advised.

    also, not sure where your specs come from, but from Lennox it is a 1/2HP motor and rise is 45-75 as I previously posted.
    The Food Stamp Program, administered by the U.S. Department of Agriculture, is proud to be distributing the greatest amount of free meals and stamps EVER.
    Meanwhile, the National Park Service, administered by the U.S. Department of the Interior, asks us to "Please Do Not Feed the Animals". Their stated reason for this policy "... the animals become dependent on handouts and will not learn to take care of themselves."
    from an excerpt by Paul Jacob in Sun City, AZ

  4. #69
    I live north of Olathe

  5. #70
    Join Date
    Jul 2006
    Location
    Virginia
    Posts
    4,633
    Quote Originally Posted by Joehvac25 View Post
    Just noticed the cap laying on the bottom lol pretty low quality.
    very low quality and piss poor work ,i would not want that tech back at all .
    We really need change now

  6. #71
    Join Date
    Jun 2005
    Location
    SW Wisconsin
    Posts
    4,977
    Quote Originally Posted by t527ed View Post
    3/4 ton blower package uses a 1/2 hp motor.
    original motor was a leadless motor with the plug at the motor where speed selections were made.
    only wires coming from motor to blower control board were white , black and red.
    when a replacement motor is used you can either run the new leads up to the board if long enough or splice them to the originals if needed.
    for a 125 furnace the red wire on the motor is the wrong one, i would go yellow or brown and check temp rise.
    capacitor laying in the bottom of blower section is just a sign of crap work ethics......
    Well, now I need to explain how the half HP motor could work okay & possibly, with perfect conditions, on the Med-HI speed as per mfg'ers recommendation.

    I figured the Btuh according to the .90 nozzle GPH delivery to the burner; they are using a .85-GPH nozzle. Btuh Input is determined by the nozzle's capacity normally it's Rated at 100-psi pressure to it.

    There is 140,000-Btu per gal of #2 diesel fuel, therefore 140000 * .85 is 119,000-Btu input *.80% efficiency for a 95,200 Output. 95200 / 71.5 is 1332-CFM.

    However, that is dependent on the filter that they recommend & at .50" ESP; which may be at .70" ESP considerably reducing air flow.

    Though they recommend Med-HI it may need to be operated on high to keep the temp-rise within the Max of 60-F listed.

    Therefore, with those perfect conditions the half HP could work.

    Many times we do not consider all the relevant factors that determine whether something will work properly...If they allow 75-F temp-rise then, with perfect air flow conditions, the half HP works A-Okay on Med-HI.
    Last edited by udarrell; 12-31-2012 at 08:09 AM.

  7. #72
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,741
    G23 is a gas furnace that uses the 1/2 hp torsion mount motor.

    with external static of .50 rated at 1455 cfm.

  8. #73
    Join Date
    Jun 2005
    Location
    SW Wisconsin
    Posts
    4,977
    Quote Originally Posted by t527ed View Post
    G23 is a gas furnace that uses the 1/2 hp torsion mount motor.

    With external static of .50 rated at 1455 cfm.
    Thank you Ed; that is the data we needed to know!

  9. #74
    Join Date
    Nov 2001
    Location
    east kansas
    Posts
    8,032
    Quote Originally Posted by jimdavisjr View Post
    I live north of Olathe
    I live south. You are out of our service area. I too think the blower is running on too low of speed.
    Beware of advice given by some guy on the Internet.

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