York YK Style H Operation Manual page 25

Enter your access code. Press the Enter (✓) button to confirm.
3.
Figure 22: Entering access code
Change setpoints
Some screens containing setpoints are programmable at the operator (V09 and earlier) and
enhanced (V10 and later) access level. If the present access level is View, a Change Setpoints button
is visible. Press the button to display an access level prompt. This allows you to log on at a higher
access level without returning to the Home screen. After logging on, you can then modify the
setpoints on that screen.
Setpoints
About this task:
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 Leaving 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 appears 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 default 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.
Manual controls
Some keys are used to perform manual control functions. 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.
Model YK Style H Centrifugal Liquid Chillers with OptiView Control Center 25