In other posts on fans and wiring its been mentioned that a 12V PWM case fan with a 12v AC to DC power supply can be used effectively to move air inside the fermentation chamber.
If I’d like to have the fan turn on during heating and cooling how would i wire this? In the above quote I’m not exactly sure what the wiring suggestion means. Can anyone elaborate please? Would I need a 3rd SSR for the fan or can I somehow utilize the two existing SSRs?
I’m still wondering how a fan like that would be wired into the brewpi? My Brewpi is hooked up through usb to my raspberry and doesn’t have its own power supply. I’ve included my wiring diagram below with a third SSR for the fan and 12v DC/AC Adaptor. This seems not quite right though, as I’d really like to figure out a way to integrate this fan simply without a third SSR, ideally having it switch on anytime EITHER the heat tube or the compressor of the fridge is switched.
It is now recommended to run the fan continuously on low power, the Antec tricool fans for example have a switch to toggle the speed.
When you are cooling, the back of the fridge will drop in temperature. After the cooling, you also want to move the air around to distribute that to other parts of the fridge.
If you want to control the fan with an SSR, you would do that on the AC side. Your schematic looks correct for that. An alternative would be to buy a PWM fan (4 pins) with a transistor inside that can be switched with 5V directly.
If I get this right, the PWM fans does not require external 12V source (ie, PC ATX PSU) and can be driven by BrewPi Spark by itself? Can someone please point out how to wire it on output of Spark and RJ12 input? Thanks in advance.
Hey Elco - still using my BrewPi (non-spark) and loving the beers and control. Just ordered a TriCool Fan like you mentioned but wondering if there’s another post depicting the wiring of such a fan into the system… (I’m novice at wiring - got through the initial BrewPi build by the skin of my teeth)