3. Enter your access code. Press the Enter (✓) button to confirm.
Figure 26: Entering access code
Change setpoints
Some screens containing setpoints are programmable at the operator (V11 and earlier) and
enhanced (V12 and later) access level. If the present access level is view, a change setpoints button
is visible on the screen. 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.
Programing 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 can be numeric values, such as 45.0°F
(-13.8°C) for the Leaving Chilled Liquid Temperature, and they can enable or disable a feature or
function. Regardless of which setpoint is being programmed, the following procedure applies:
1. Press the required setpoint button. 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 buttons to enter the preferred
value. Leading zeroes are not necessary. Press the ‘•’ button if a decimal point is necessary.
a. Press the ▲ button to set the entry value to the default for that setpoint. Press the ▼
button to clear the present entry. Press the ◄ button, the backspace button, to make the
entry point move back one space.
b. If the dialog box begins with the word SELECT, use the ◄ and ► buttons to select the
preferred value.
c. Press the X (Cancel) button to dismiss the dialog box and keep the previously defined
setpoint.
3. Press the Enter button.
Result
If the value is within range, it is accepted and the dialog box disappears. The chiller begins to
operate based on the new programmed value. If out of range, the value is not accepted and you
are 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 compressor speed or valve actuators. These are typically restricted to qualified
technicians in Service access. Other keys in this category are used to initiate/terminate processes
such as calibrations or reports.
YMC
2
Mod B with OptiView Control Center
34
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