Navigation - York YK Style H Operation Manual

FORM 160.76-O2
issue date: 6/15/2015
Setpoints
The Control Center uses the setpoint values to control
the chiller and other devices connected to the chiller
system. Setpoints can fall into several categories. They
could be numeric values (such as 45.0°F for the Leav-
ing Chilled Liquid Temperature), or they could enable
or disable a feature or function.
Regardless of which setpoint is being programmed, the
following procedure applies:
1. Press the desired setpoint key. A dialog box ap-
pears displaying the present value, the upper and
lower limits of the programmable range, and the
default value.
2. If the dialog box begins with the word ENTER,
use the numeric keys to enter the desired value.
Leading zeroes are not necessary. If a decimal
point is necessary, press the '•' key (i.e. 45.0).
Pressing the ▲ key, sets the entry value to the de-
fault for that setpoint. Pressing the ▼ key, clears
the present entry. The ◄ key is a backspace key
and causes the entry point to move back one space.
If the dialog box begins with SELECT, use the
◄ and ► keys to select the desired value.
If the previously defined setpoint is desired, press
the 'X' (Cancel) key to dismiss the dialog box.
3. Press the '' (Enter) key.
4. If the value is within range, it is accepted and the
dialog box disappears. The chiller will begin to
operate based on the new programmed value. If
out of range, the value will not be accepted and
the user is prompted to try again.
JOHNSON CONTROLS
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
Manual Controls
Some keys are used to perform manual control func-
tions. These may involve manual control of items such
as the Pre-rotation Vanes, variable orifice or oil pump
speed. Other keys in this category are used to initiate/
terminate processes such as calibrations or reports.
Free Cursor
On screens containing many setpoints, a specific
SOFT key may not be assigned to each setpoint value.
A SOFT key will be assigned to enable the cursor ar-
row keys below the numeric keypad which are used to
HIGHLIGHT the desired setpoint field. At this point,
the () key is pressed to bring up a dialog prompt-
ing the user to enter a new setpoint value. The (X) key
cancels cursor mode. (Refer to the Schedule Screen on
Page 131 for an example.)

NAVIGATION

In order to maximize the amount of values which 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 de-
sired screen. The system will immediately refresh the
display with the graphics for that screen. Following is
a layout of all the screens and how they are connected.
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