I just bought and assembled a Velleman MK138 Thermostat Mini Kit. It works fine but I still have some questions about it. I want to switch ON a 12V DC fan inside a 1500W UPS when the temperature in it reaches about 35 degrees Celsius. It must cool down the inside to about 25 degrees and then shut down the fan again. I know that a thermostat starts at a low temperature and shuts down when the desired high temperature is reached. How can I make the MK138 start at the high temperature and have the relay shut down at the low temperature? Of course I can use the NO contact of the relay but then the relay is ON when the fan is OFF. What would be the values of R5, R6 and R7 if I want to control the temperatures between 25 and 35 degrees?
Hope anyone can help me. Regards, HHarry15, Netherlands
Hi
You could look at this thread.
http://forum.velleman.eu/viewtopic.php?f=7&t=647&hilit=mk138
Hi Wrong Way,
I visited the site
viewtopic.php?f=7&t=647&hilit=mk138
And my questions were answered!!!
Thanks very much for your help!!!
HHarry15
No problem.
Enjoy!