Carrier 48FC M20 Series Service And Maintenance Instructions page 58

CO Sensor
24V
+
Analog
Out
–
1 Power supply. Provide disconnect
means and overload protection
as required.
Fig. 77 — CO
INTERFACE OVERVIEW
This section describes how to use the EconoMi$er
face for:
• Keypad and menu navigation
• Settings and parameter changes
• Menu structure and selection
USER INTERFACE
The user interface consists of a 2-line LCD display and a 4-button
keypad on the front of the economizer controller.
KEYPAD
The four navigation buttons (see Fig. 78) are used to scroll
through the menus and menu items, select menu items, and to
change parameter and configuration settings.
To use the keypad when working with menus:
• Press the ▲ (Up arrow) button to move to the previous menu.
• Press the ▼ (Down arrow) button to move to the next menu.
• Press the (Enter) button to display the first item in the
currently displayed menu.
• Press the (Menu Up/Exit) button to exit a menu's item
and return to the list of menus.
Menu Up Menu Up Menu Up
(Exit) (Exit) (Exit)
Scroll Scroll Scroll
Button Button Button
Up/Down Up/Down Up/Down
Buttons Buttons Buttons
Fig. 78 — W7220 Controller Navigation Buttons
Red L1
(Hot)
Black
L2
1
Yellow
Brown
Orange
Green
Sensor Wiring
2
® X user inter-
Select Select Select
(Enter) (Enter) (Enter)
Button Button Button
To use the keypad when working with Set Points, System and Ad-
vanced Settings, Checkout tests and Alarms:
1. Navigate to the desired menu.
2. Press the
currently displayed menu.
3. Use the ▲ and ▼ buttons to scroll to the desired parameter.
4. Press the
rently displayed item.
5. Press the ▲ button to increase (change) the displayed param-
eter value.
6. Press the ▼ button to decrease (change) the displayed param-
eter value.
NOTE: When values are displayed, pressing and holding the
▲ or ▼ button causes the display to automatically increment.
7. Press the
store it in nonvolatile RAM.
8. "CHANGE STORED" displays.
9. Press the
parameter.
10. Press the
menu.
MENU STRUCTURE
Table 18 illustrates the complete hierarchy of menus and parame-
ters for the EconoMi$er
The Menus in display order are:
• STATUS
• SET POINTS
• SYSTEM SETUP
• ADVANCED SETUP
• CHECKOUT
• ALARMS
IMPORTANT: Table 18 illustrates the complete hierarchy.
Your menu parameters may be different depending on your
configuration.
For example, if you do not have a DCV (CO
none of the DCV parameters appear and only MIN POS
will display. If you have a CO
DCV MAX will appear AND if you have 2 speed fan DCV
MIN (high and low speed) and DCV MAX (high and low
speed will appear).
NOTE: Some parameters in the menus use the letters MA or
MAT, indicating a mixed air temperature sensor location before
the cooling coil. This unit application has the control sensor locat-
ed after the cooling coil, in the fan section, where it is designated
as (Cooling) Supply Air Temperature or SAT sensor.
2 Line 2 Line 2 Line
SETUP AND CONFIGURATION
LCD LCD LCD
Before being placed into service, the W7220 economizer module
must be setup and configured for the installed system.
IMPORTANT: During setup, the economizer module is live
at all times.
The setup process uses a hierarchical menu structure that is easy to
use. Press the ▲ and ▼ arrow buttons to move forward and back-
ward through the menus and press the button to select and confirm
setup item changes.
TIME-OUT AND SCREENSAVER
When no buttons have been pressed for 10 minutes, the LCD dis-
plays a screen saver, which cycles through the Status items. Each
Status items displays in turn and cycles to the next item after
5 seconds.
58
(Enter) button to display the first item in the
(Enter) button to display the value of the cur-
(Enter) button to accept the displayed value and
(Enter) button to return to the current menu
(Menu Up/Exit) button to return to the previous
® X system.
sensor, the DCV MIN and
2
) sensor, then
2