I needed to replace the controller in my remote io cabinet so I went ahead with this 12v programmable temperature relay. When the internal air temperature gets above 36C I want the vent fan to come on.
Read on for the installation of this WH9002A controller and fan.
Step 1: The Vent Fan.
This 80mm brushless pc fan I secured onto the cabinet lid.
Step 2: Placing the Controller.
Using double sided tape I stuck the controller on the inside of the lid.
Step 3: Placing the Sensor.
The sensor I placed at the top of the lid to measure the hottest temperature.
Step 4: Wiring the Fan.
The positive wire of the fan I connected to the NO contact of the controller relay. The common I wired to the 12v supply terminal.
Step 5: Power Supply.
Using an existing terminal block for 12v electronics, I tapped off for the fan controller.
Step 6: Programming.
The HS is 33C. The D is 3C. Delay and timer are both 0. HC is set to C.
Step 7: Completion!
The fan controller is now operational. I tested the functionality with a hot spoon placed in boiling water. At 36C the fan is on and at 33C it goes off. Perfect!