How To Sail Diagrams Does Anyone Know How To Wire The Honeywell Powered Flow-Through Humidifier?

Does anyone know how to wire the Honeywell Powered Flow-Through Humidifier? - how to sail diagrams

I am planning to buy one of these devices, and it seemed that the installation guide on the website. But I can not understand how you come in contact. They talk about using the sail switch and I'm not sure how or why I want to use. All proposals to make this device because the wiring diagram looks a bit complicated.