thermostat controlled equipment cooling fan

pcg

There has been discussion in the past about a very small cooling fan that activates when it gets hot, specifically for use in keeping electrical equipment cool. I've searched and can't find the discussion. I believe Dr. Bob (Thataway) is familiar with this device and was part of the discussion. I was going to PM him, but then I thought why not go public with this inquiry in case it helps someone else beside me. So... some info please. Thank you!

thataway · Posted: Thu Nov 24, 2022 4:49 pm Post subject:

I have used "snap discs" for the thermostatic control. They are set at a specific temperature. Otherwise one can use any 12 V. Thermostat, and if the fan is more than a few milliamps (like computer fans), then a 12 volt relay.

This one closes at 90 degrees opens at 80 degrees Easy to insert in a circuit. You can get ranges which suit your application:

When I had a hydronic diesel heater in the Cal 46, I used computer fans, and a wall type of thermostat with control directly. Robert Shaw makes a number these, often with a thermometer. The digital ones are nice, but the mechanical ones work just as well.

pcg · Posted: Thu Nov 24, 2022 5:04 pm Post subject:

ssobol · Posted: Fri Nov 25, 2022 12:42 pm Post subject:

I use one of these to control a cooling fan on my boat. It has adjustable set points.

ebay link

pcg · Posted: Fri Nov 25, 2022 2:33 pm Post subject:

Marco Flamingo · Posted: Sat Nov 26, 2022 2:29 pm Post subject:

I found these to be incredibly fast, accurate, and simple. Search around if you need different temps or NC (normally closed). The little silicone sleeve is required to keep it from shorting to ground if attached directly to a metal surface.

https://www.amazon.com/gp/product/B07PLC3M8V/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

In my application, it's just controls a buzzer/LED light. I don't know about running higher amps through it. Same with the one ssobol shows. My little one can handle >12V sensor input, which it looks like the other thermostat doesn't. Still, the Ebay one is an amazing thermostat for $5.89.