pmw fan controllers

[parsonsj]

The DCC unit has a temp probe. You set it to run at say 185*. It varies fan speed to maintain 185*. It slowly ramps up, it does not jump to 50%. I've never seen my fans at full voltage, even idling for 20+ minutes in 100* heat. The AC on input turns the fans on 50% IIRC, but I don't have that hooked up right now.

I used it on II Much, and mine behaved exactly like Scott describes. I also added the A/C hookup with a trinary switch and it all behaved flawlessly. Highly recommended.