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  1. #1
    Join Date
    May 2007
    Location
    california
    Posts
    223

    American standard freedom 80

    I have a 190 -30 limit switch to replace .. Does this switch activate the blower when the temp reaches 160 and when it exceeds 190degrees ??

  2. #2
    Join Date
    Mar 2007
    Location
    NW AR
    Posts
    2,478
    Not sure of that unit but unless its a dinosaur the limit switch doesnt activate the blower. Its a safety.

    It will open at 190 and close at 160

  3. #3
    Join Date
    Aug 2007
    Location
    Northern VA 38 degrees N by 76 degrees W
    Posts
    5,060
    Quote Originally Posted by jmiles View Post
    I have a 190 -30 limit switch to replace .. Does this switch activate the blower when the temp reaches 160 and when it exceeds 190degrees ??
    It is a safety and at 190 will open the 24 volts to gas valve and auto reset when it reaches 160

  4. #4
    Quote Originally Posted by jmiles View Post
    I have a 190 -30 limit switch to replace .. Does this switch activate the blower when the temp reaches 160 and when it exceeds 190degrees ??
    If it starts with L (L190-30) it's just a limit if it starts with F (F190-30) then it controls the fan... i think thats pretty much it

  5. #5
    Join Date
    Jan 2011
    Location
    Boston, MA
    Posts
    461
    Yup thats just a safety. Like said above opens at 190 and closes at 160. For the fan, that is timed ON and OFF by the board.

  6. #6
    Join Date
    Dec 2007
    Location
    north suburbs of Chicago
    Posts
    533
    I can't picture that furnace but on many units, probably most all today, if that limit opens it will also power on the blower and often the inducer as well.

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