little home project, exhause fan control

[comfortmaster1]

I have a variable speed kithen exhause fan. Sometime people uses the range and don't turn on the fan.

I want to have the fan turn-on automatically at various speeds depending on needs.

I was thinking having a temperature sensor control the speed of the fan. Higher temp - higher speed.

spec: 120v fan

assumption: fan speed is varied by cutting the frequency.

question: is there small device (like a head pressure control by slowing down the condensor fan) that will vary the freq base on temp?

I would like to have some flexiblity in defining the range. For example; at < 95 degree, disable fan
at 95 degree, run at 10 hz
at > 120 degree, run at 60 hz.

this should be fun.

[Edited by comfortmaster1 on 08-02-2005 at 05:30 PM]

[qtip]

WOW lots of time on your hands or what???
No offense!!!!!!

[amigo]

http://www.controlres.com/nimbus.htm

[controldude]

AC Tech makes some small afordable vfd's and you could control this with a Johnson A350P for speed from temps mentioned and A350 will enable start/stop.
Just a thought.

[crab master]

Just yell at the people not turning the fan on when they cook and tell them if they keep it up they'll pay the electric bill for the added a/c usage. It took a couple of weeks with the wife but she finally remembers to turn the fan on!