The links below will lead you to helpful videos that will give you more information about the Climate Control Kit which comes with the H5i™ Humidifer and coach you on how to use it.
Climate Control Kit: Increasing your comfort: Introduction to Climate Control
ResMed - Humidification and Climate Control: Why use Climate Control?
ResMed - Climate Control and How it Works
ResMed - Is Your H5i Working?
ResMed - Adjusting Your H5i Manually (not recommended)