Differential Thermostat

Differential thermostat for your solar project. I use one of these to trip the fan in my solar lumber drying kiln, but they have many uses. Building a solar hot water system? This will work perfectly to turn your pumps on.

- SPDT relay output. This means you have "normally open" and "normally closed" outputs on the board. Useful if you want to turn things OFF at a certain differential temperatures and not just turn things on.
- LED indicators to show you what the board is doing.
- Freeze protection, will not trip relay if either of the sensors are disconnected, or either read below freezing. You can disable this.
- Will run from just about any "wall wart" type power supply.
- Differential adjustable from 1C to about 24C

The output section of this circuit boad is good for 24V, AC or DC, and can handle 5 amps. Note that this is a thermostat and not a motor controller, to turn on or off motors that run on AC line voltages you should use a proper relay or contactor, and control that with this thermostat.

This includes two temperature sensors. They are cased and potted, with short pieces of wire attached so you can extend them for your project. See below. I will also include instructions for making your own when you purchase this board, if you wish to do that. If you are wanting just the theremostat, you will need to contact me about the purchase. Use the contact form on this webpage.



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