1. The controller is installed directly on the valves, can't use any tools to avoid damaging the controller 
2. The controller can't be removed for the maintenance. The controller will be completely damaged if open the housing
3. The installation direction should be horizontal or vertical. It can't be upsidedown to prevent liquid entering the housing.
4. If it is installed in a box, more than 30MM space need to be reserved on the upper side of the controller for convenient operation and replacement.

Warning！
※ Please check the working voltage before the power is on, to avoid damaging the product.