Johnson Controls York YD Manual page 27

Navigation
In order to maximize the amount of values that the panel can display to the user, and in order
to place those values in context, multiple screens have been designed to describe the chiller
operation. In order to move from one screen to the next, navigation keys have been defined.
These keys allow the user to either move "forward" to a subscreen of the present screen, or move
"backward" to the previous screen. Except for the Home Screen display, the upper-right "soft" key
will always return the user to the Home Screen. Navigating with "soft" keys is as simple as pressing
the key next to the label containing the name of the desired screen. The system will immediately
refresh the display with the graphics for that screen. The following is a layout of all the screens and
how they are connected.
Figure 4: Overview of screen layout
Languages
The Screens can be displayed in various languages. Language selection is done on the USER Screen.
The desired language is selected from those available. Not all languages are available. English is
Model YD Mod D with OptiView Control Center 27