Instruction manual

6 McQuay OM 920
Using the Keypad/Display
Using the Keypad/Display
The keypad/display consists of a 5-line by 22 character display, three keys and a “push and
roll” navigation wheel. There is an Alarm Button, Menu (Home) Button, and a Back Button.
The wheel is used to navigate between lines on a screen (page) and to increase and decrease
changeable values when editing. Pushing the wheel acts as an Enter Button.
Figure 1: Keypad Controls
The first line on each page includes the page title and the line number to which the cursor is
currently “pointing”. The line numbers are X/Y to indicate line number X of a total of Y lines
for that page. The left most position of the title line includes an “up” arrow to indicate there
are pages “above” the currently displayed items, a “down” arrow to indicate there are pages
“below” the currently displayed items or an “up/down” arrow to indicate there are pages
“above and below” the currently displayed page.
Each line on a page can contain status only information or include changeable data fields.
When a line contains status only information and the cursor is on that line all but the value
field of that line is highlighted meaning the text is white with a black box around it. When the
line contains a changeable value and the cursor is at that line, the entire line is highlighted.
Each line on a page may also be defined as a “jump” line, meaning pushing the navigation
wheel will cause a “jump” to a new page. An arrow is displayed to the far right of the line to
indicate it is a “jump” line and the entire line is highlighted when the cursor is on that line.
The keypad/display Information is organized into five main menus or menus groups; Alarm
Lists Menu, System Summary Menu, Standard Menus, Extended Menus and Advance Menus.
Note – Only menus and items that are applicable to the specific unit configuration are displayed.
The Alarm Lists Menu includes active alarm and alarm log information. The System
Summary Menu includes status information indicating the current operating condition of the
unit. Standard Menus include basic menus and items required to setup the unit for general
operation. These include such things are control mode, occupancy mode and heating and
cooling setpoints. Extended Menus include more advanced items for “tuning” unit operation
such as PI loop parameters and time delays. Advanced Menus include the most advanced
items such as “unit configuration” parameters and service related parameters. These generally
do not needing changing or accessing unless there is a fundamental change to or a problem
with the unit operation.
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System Summary
Advanced Menus
Alarm Lists
Unit State= Cooling
Clg Capacity=
25%