York 00497VIP Screen Descriptions and Usage, Setpoint / Change Schedule, Setpoints, Free Cursor

FORM 50.40-OM2

SCREEN DESCRIPTIONS AND USAGE

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 defined setpoint is desired, press
the ‘X’ (Cancel) key to dismiss the dialog box.	3
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 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 “highlight” 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 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 defined. These keys allow the user to either

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