Great post on this mod. Was wondering if someone could take a look at what I'm doing so I can get my fridge working.

I'm using a potentiometer to modulate the resistance between 0-1500 ohm on the fridge via a Inkbird ITC-1000F temperature controller. The issue I'm having is how to wire the C-T bridge into the controller.

I have 12V power going into ports 1-2, temperature sensor into ports 3-4, 12V power into port 7, 12V power out of port 8 when cooling is activated.

Do I just need to add a jumper from port 8 to T prior to 12V going to the potentiometer in order for this to work?

 

Note: C and T terminals on this controller can have a fixed resistance or a variable resistance depending motor rpm as per Danfoss chart in this post. No voltage is applied to this part on the circuit.

 

Note: C and T terminals on this controller can have a fixed resistance or a variable resistance depending motor rpm as per Danfoss chart in this post. No voltage is applied to this part on the circuit.

That makes so much more sense...I think I had been looking at it for too long and started crossing wires with my eyes!

Would the output from port 8 then go to the main 12V power for the fridge? Otherwise the compressor wouldn't know when to turn on/off based on if the cooling circuit is engaged, correct?

So something like this?

 

Would the output from port 8 then go to the main 12V power for the fridge? Correct

 

Can I refer you to previous post/s (namely,debe) which referred to motor speed change. If you check Danfoss DB50F specs, it will tell you that the resistance change between C & T will alter motor speed, ~700ohm, 3000rpm while 2000rpm, no resistor required.
Just curious why you're changing the Isotherm hardware ? Modification of current hardware may achieve what you are wanting. Maybe mark the rotating speed selector at 3000rpm/2000rpm positions or replace with 2 position switch with relevant resistor in circuit.

Hi
I have now purchased a three way switch and looking for a 700ohm resistor to put inline to up the speed of my compressor to 3000 RPM. Not being that good on electronics I am having doubts about exactly which resistor to use. There are so many options and it seems as if Wattage is also an important factor.
Would you be able to point me in the right direction for Resistors that would work in this setup?
I got this far.....
https://www.digikey.it/en/products/...AE6EQAX3WkYVWvQZl2DVfnH5+ZZd1IpoIXlDB8HkGEk1A

 

Curious as to why you're trying change the speed of the motor ? As to the resistor selection, if you refer to the compressor speed chart at 3000 rpm, the current is only 3mA so a 1/4W rated resistor would be more than adequate.

 

Curious as to why you're trying change the speed of the motor ? As to the resistor selection, if you refer to the compressor speed chart at 3000 rpm, the current is only 3mA so a 1/4W rated resistor would be more than adequate.
View attachment 350741

Many thanks for the reply. Is this entire string not exactly about that. Changing the speed of the motor so the compressor runs faster so it cools better, or am complete off the subject?

 

Спасибо, за помощь Я из Туркменистана