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  1. #1
    Join Date
    Mar 2006
    Posts
    2

    T-stat fan setting

    I have a new Westinghouse gas furnace and ac system (with a variable speed motor) and a new WhiteRodgers t-stat. The t-stat has 3 options for the fan setting (on / off / prog). The prog setting will cycle the fan for 10 minutes on and 20 minutes off - if the t-stat has not called for heat or cool during the past 60 minutes.

    I like the prog setting, but I am wondering if it adds much wear or harm to the system? and if the electric consumption is very much.

    I live in Dallas, TX -- so much of the time during the fall, winter, and spring my system is not call for heat / cool.

    Any recommendations ?

    Thanks --

  2. #2
    Join Date
    Nov 2007
    Location
    Landisburg,PA
    Posts
    69
    its better to keep moveing parts moveing so yea let it like it is

  3. #3
    Join Date
    Dec 2007
    Location
    Southern, CA
    Posts
    520
    I haven't seen this type personally, but from your description I'd say the extra position is supposed to be a energy saving compromise. In the off position the fan runs only when the rest of the system does. The on position runs it on high until you turn it off, regardless of what the system does. Commercial systems are often set this way, for air circulation and more precise temp control. I think the third on yours is designed to stir up the air occasionally, to get the benefits of constant fan without as big a bill.

    The only problem is starting motors takes a toll, even with variable speed. So unless you have major temp changes from one end of the house to the other, (which should be addressed by other means if so) I'd leave it off. Replacements for your motor aren't cheap. Like anything else it has a service life which is used up in part every time it starts. But its up to you and what makes you comfortable.

  4. #4
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,880
    It will not run the VS blower in high in the ON setting. VS blowers don't work like that.

    IN the ON, and PROG mode, the blower runs at 50% of high cool speed, it doesn't use much electric at that low speed.

    It adds some wear to the motor starting, and running for 10 minutes. But doubtful its enough tht it will shorten the motors lifespan by any notable time.

    There are other stats that do the same. I don't know of any complaints that the VS motors went out early because of it.
    Contractor locator map

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  5. #5
    Join Date
    Dec 2006
    Location
    Middle Tennessee
    Posts
    11,347

    *

    Quote Originally Posted by beenthere View Post
    It will not run the VS blower in high in the ON setting. VS blowers don't work like that.

    IN the ON, and PROG mode, the blower runs at 50% of high cool speed, it doesn't use much electric at that low speed.

    It adds some wear to the motor starting, and running for 10 minutes. But doubtful its enough tht it will shorten the motors lifespan by any notable time.

    There are other stats that do the same. I don't know of any complaints that the VS motors went out early because of it.
    i was posting bout the same exact thing, (now that is scary)

    you beat me to it!



    .

  6. #6
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,880
    Quote Originally Posted by Airmechanical View Post
    i was posting bout the same exact thing, (now that is scary)

    you beat me to it!



    .
    LOL
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  7. #7
    Join Date
    Feb 2007
    Location
    18951
    Posts
    1,593
    I turned my fan to on 20 years ago when I installed my ac system. Except for a few hours, it hasn't been off since. If the filter is kept clean, the worst thing for an air cooled motor is stopping and starting. I never figured out the electric cost, but we feel a lot better because the air is kept cleaner, and doesn't get stratified at night.

  8. #8
    Join Date
    Dec 2007
    Location
    Southern, CA
    Posts
    520
    You learn somethin new everyday. I wonder what those tricky engineers have lined up for the next “improvement” to further confuse and amuse us. Scratch that, I don't want to know.

  9. #9
    Join Date
    Dec 2006
    Location
    Middle Tennessee
    Posts
    11,347

    *

    Quote Originally Posted by Coolmaniac View Post
    You learn somethin new everyday.

    imagine how boring things would be if everyone knew everything



    .

  10. #10
    Join Date
    Jan 2007
    Posts
    84
    Is this the same setting as circulate on a Trane 803 stat with variable speed air handler?

  11. #11
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,060
    Yup, that be what they are discussin'

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