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SECTION 3 - OPTIVIEW CONTROL CENTER
JOHNSON CONTROLS
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FORM 160.72-O1 (810)
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:
Press the desired setpoint key. A dialog box ap- 1.
pears displaying the present value, the upper and
lower limits of the programmable range and the
default value.
If the dialog box begins with the word ENTER, use
2.
the numeric keys to enter the desired value. Lead-
ing 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 dia-
log 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.
Press the ‘
3.
ü
’ (Enter) key. 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 func-
tions. These may involve manual control of items such
as the pre-rotation vanes, variable orifice or hot gas by-
pass valve. Other keys in this category are used to initi-
ate/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 arrow keys
below the numeric keypad which are used to HIGH-
LIGHT the desired setpoint field. At this point, the ‘
ü
’
key is pressed to bring up a dialog prompting the user
to enter a new setpoint value. The ‘X’ key cancels cur-
sor mode.
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 de-
fined. These keys allow the user to either move FOR-
WARD 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. Following is a layout of all
the screens and how they are connected.
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