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  1. #14
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    Jan 2004
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    Lancaster PA
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    I'm not a professional and I know.

    Thats must be why the info you posted is incorrect.
    You have no idea what type control he saw there.
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  2. #15
    Join Date
    Dec 2006
    Location
    Middle Tennessee
    Posts
    11,347

    *

    either way this stuff should not be discussed in a public forum

    i can visualize some diyer reading this and thinking this may be his problem

    so he changes a part incorrectly and blows himself up!

    i need moderator status so i can remove this thread from here!



    .

  3. #16
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    68,125
    You can click on the triangle, and send an email to a mod, expressing your concern and thought on that.
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  4. #17
    Join Date
    Feb 2004
    Posts
    2,458
    [QUOTE=cook42;1805246]Hello,

    I'm new to the forum and I've been in the field for about 4 yrs now but I ran into something that I never seen before. On this lennox unit there was this fan limit switch with a heater. I call lennox tech support and the guy on the phone act like he did not know what it was and what it was used for. Could some one please explain to me what's its function and is it me or is lennox tech support the most complicated people to deal with for information? And also do anyone think that they over control their units?

    PS:

    This was a 80% upflow 100,000 BTU furnace. I can't find the model # but I know the control was a old Honeywell part and the insert size that goes inside the furnace was 8" long.



    Heat assist fan switch: Probably the best thing about this type of switch is it's ability to control blower short cycling. When the t'stat is energized it also energizes the heater portion of the fan switch. As it heats a bi-metal strip, the strip warps and closes the fan switch prematurely. As long as the t'stat is calling for heat the blower will stay on. Lets say the return air is pulled from a tile floor area. Since that area would be cold in the morning the air from that area would also be cold and as it passed over the fan switch it would cool it down and it would open, hence short cycling. IF you had a conventional fan switch.

    As stated before: please sign up for pro

  5. #18
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    68,125
    Its time it was moved.
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  6. #19
    Join Date
    Feb 2008
    Location
    Dallas & Longview, TX
    Posts
    629
    Quote Originally Posted by beenthere View Post
    I'm not a professional and I know.

    Thats must be why the info you posted is incorrect.
    You have no idea what type control he saw there.
    I guess you missed the "Maybe I'm reading your post wrong but are you asking what a fan limit switch is? "

    Do you not know what a fan limit switch (with assist heater) is? I think from your prior post you are smart enough. I know there are different kinds but the OP seemed to imply he didn't know.

    Just thought it was funny. Sorry to upset your domain.

  7. #20
    Join Date
    Feb 2004
    Posts
    2,458
    Quote Originally Posted by Jay 41 View Post
    Also, maybe I missed it, is it the old cam-stat style, or honeywell? If it's the cam-stat, it's time to upgrade to the honeywell.

    PS:

    This was a 80% upflow 100,000 BTU furnace. I can't find the model # but I know the control was a old Honeywell part and the insert size that goes inside the furnace was 8" long.

    Thanks

  8. #21
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    68,125
    Quote Originally Posted by Daltex View Post
    I guess you missed the "Maybe I'm reading your post wrong but are you asking what a fan limit switch is? "

    Do you not know what a fan limit switch (with assist heater) is? I think from your prior post you are smart enough. I know there are different kinds but the OP seemed to imply he didn't know.

    Just thought it was funny. Sorry to upset your domain.
    Maybe, if your description of how it works was correct, I wouldn't have told you, that your wrong.
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  9. #22
    Join Date
    Mar 2005
    Location
    Suppy NC
    Posts
    4,513
    ok it has been a rough day but what the hell is a fan assist heater. Is this some kind of hard start kit

  10. #23
    Join Date
    Feb 2004
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    2,458
    Quote Originally Posted by tinknocker service tech View Post
    ok it has been a rough day but what the hell is a fan assist heater. Is this some kind of hard start kit
    Check post #17, if you want more of an explanation please ask

  11. #24
    Join Date
    Mar 2005
    Location
    Suppy NC
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    Quote Originally Posted by mike3 View Post
    Check post #17, if you want more of an explanation please ask

    did you not see the smily face
    i was joking arround

  12. #25
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    Jan 2004
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    Lancaster PA
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    Quote Originally Posted by tinknocker service tech View Post
    did you not see the smily face
    i was joking arround
    Your smileys were on the next line.
    I missed them too.
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  13. #26
    Join Date
    Feb 2004
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    2,458
    Quote Originally Posted by tinknocker service tech View Post
    did you not see the smily face
    i was joking arround
    I guess ooops...sorry

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