Computer Cooling Fan Wiring Diagram

Most stand alone adjustable thermostats i e.

Computer cooling fan wiring diagram.

However for optimum performance it may become necessary to slightly change the values of components c1 r4 and c2. You don t need it to make the fan turn but the third wire is there for a good reason. Finally note that the connector of a common 2 wire fan has a red and a black cable. The ins and outs of a 4 wire computer fan.

Used 4 wire fan for these two projects. The cooling fan wiring diagram below is what we ve found to be the simplest and most reliable method. It uses a 40 amp electric relay and electric fan sensor. Hayden flex a lite or perma cool brands can provide a 12 volt output when activated.

You can use almost all standard 3 wire cooling fans with this adapter circuit. Suggested electric fan wiring diagrams suggested primary cooling fan single speed on off using 12 volt switching devices only for primary activation note. Start your wiring project by taking both of the positive wires from the fans and run them to the yellow wires on each relay tab 87. A pc fan s wire colors are pretty consistent with red almost invariably marking the positive and black marking the negative or ground.

The third wire varies depending on the manufacturer but usually it is blue or yellow.