American standard freedom 80

[jmiles]

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 ??

[ar_hvac_man]

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

[second opinion]

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

[RobFarns]

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

[FrostyBeer]

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.

[Glennhvac]

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.