How to use W1219:
W1219 manual is available on protosupplies.com
In red: “Detection temperature” will display the temperature currently measured by the sensor.
In green: “Setting temperature” will display the targeted temperature.
To modify “Setting temperature” press once on the left button. When it is flickering, you can change by pressing + or – button.
With recommended set-up, it will work as shown below:
Let’s say you set up 40°C:
When “detection temperature” goes over “setting temperature” + 2°C, so 42°C, the fan will turn on (indicator light will be ON).
When “detection temperature” goes below “setting temperature”, so 38°C, the fan will turn off (indicator light will be OFF).