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FORM 50.40-OM2
19YORK INTERNATIONAL
OVERVIEW
The new graphical display on each control panel allows
a wide variety of information to be presented to the
user. Each screen description in this document will
begin with a section entitled Overview which will
describe the graphical elements on the screen and
give a short summary of the functions available. Each
element on the screen will then be categorized into
three distinct groups: Display Only, Programmable, and
Navigation. Below is a short description of what types
of information are included in these groups.
DISPLAY ONLY
Values in this group are read-only parameters of
information about chiller operation. This type of
information may be represented by a numerical value,
a text string, or an LED image. For numerical values, if
the monitored parameter is above the normal operating
range, the high limit value will be displayed along with
the ‘>’ symbol; if it is below the normal operating range,
the low limit value will be displayed along with the
‘<’ symbol. In some cases, the value may be rendered
invalid by other conditions and the display will use
X’s to indicate this.
PROGRAMMABLE
Values in this group are available for change by the
user if the chiller/condensing unit is in remote mode.
If there are no values that can be changed then “None”
is shown.
Setpoint / Change Schedule
On screens containing programmable setpoints, a key
with one of these labels will be visible. This key allows
the user to modify setpoints on that screen.
Setpoints
Setpoint values are used to control chillers/condensing
units and other devices connected to the units. 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/Yes or Disable/No
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 dened setpoint is desired, press
the ‘X’ (Cancel) key to dismiss the dialog box.
3. Press the ‘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
functions. These may initiate/terminate processes
such as a report.
Free Cursor
On screens containing many setpoints, a specic “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
“highlight” the desired setpoint eld. 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 cursor mode. (See “Change Schedule” from
the Setpoints Screen 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 each unit’s operation. In order
to move from one screen to the next, navigation keys
have been dened. These keys allow the user to either
SCREEN DESCRIPTIONS AND USAGE
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