REVELTRONICS

I'm considering switching out the mechanical fan to an electric one. That will necessitate the need for a fan controller, which I think the UTCOMP can probably do but I want to confirm.

Using pin B7 (DigOutUser), I can control a relay that will engage the fans. What I'm not 100% I understand the regulation mode configuration. I need to turn ON the fans at say 185F and then have them turn OFF when temp reaches 170F. Is that possible?

Matthew


PS - As the fans have a high current draw, I'm wondering if this would be an appropriate relay?

https://www.amazon.com/5-12V-High-power ... B00ZC4Z0T0
OR
https://www.newark.com/te-connectivity/ ... dp/66F6688

Yes you can achieve it.
As signal source you should select temperature.
Control mode: Above threshold, where HI threshold = 185F
Hysteresis = 15F (so it will disable at 185-15=170F).
You will have +5V at DigOutUser output when temp > 185F and it will disconnect output (Hi-Z state) when it drops to 170F.
Please take a look for a example: https://www.youtube.com/watch?v=c7WyZzU97XA
Please note that UTCOMP is controlling output only when it is enabled (ignition switch is ON), so if you would like to control it also when you switch off, then you should use additional relay with delay for UTCOMP ignition input.

1st solution is better because it is with logic so it does not drain any current from UTCOMP.
2nd solution is relay with 25ohm coil so it will drain 5V/25ohm = 200mA - it is quite high - it is recommended to no exceed 100mA, so 5V relay with >50ohm coil will be better.

Success!

After properly wiring the Songle relay, I have UTComp controlling the electric fan.

A minor update.... the Songle relay I used did not last long controlling a high amperage fan. I had to redesign the setup to have a relay control a relay.