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EconoMi$er X
EconoMi$er X is a low leak economizer system which is
available for 2- - stage cooling units equipped with the SAV
2- - speed Variable Frequency Drive (VFD) system.
The factory- - installed option consist of the following:
S Low leak economizer assembly
S W7220 economizer controller
S 20K dry bulb temperature control sensor
S Enthalpy control sensor (enthalpy economizer only)
W7220 Economizer Controller
The economizer controller used on electro mechanical units
is a Honeywell W7220 which is located in the RTU base
unit's Control Box. See the Installation Instructions for your
base unit for the location of the Control Box access panel.
The W7220 controller provide the following:
S 2- - line LCD interface screen for setup, configuration
and troubleshooting.
S On- - board fault detection and diagnostics
S Sensor failure loss of communications identification
S Automatic sensor detection
S Capabilites for use with multiple- - speed indoor fan
systems
User Interface
The user interface consists of an LCD display and a
4- - button keypad on the front of the economizer controller.
MENU UP
SCROLL
(EXIT)
UP/DOWN
BUTTON
BUTTONS
Fig. 2 - - W7220 Controller
Keypad
The four navigation buttons (see Fig. 2) are used to scroll
through the menus and menu items, select menu items,
and to change parameter and configuration settings.
Using the Keypad with Menus
To use the keypad when working with menus:
S Press the
menu.
S Press the
menu.
S Press the
the currently displayed menu.
S Press the
item and return to the list of menus.
Using the Keypad with Settings and Parameters
To use the keypad when working with Setpoints, System
and Advanced Settings, Checkout tests and Alarms:
1. Navigate to the desired menu.
2. Press the
3. Use the
4. Press the
5. Press the
6. Press the
7. Press the
8. "CHANGE STORED" displays.
9. Press the
10. Press the
2 LINE
LCD
Menu Structure
Table 2 illustrates the complete hierarchy of menus and
parameters for the Economizer X system.
SELECT
The Menus in display order are:
(ENTER)
BUTTON
S STATUS
S SETPOINTS
C11548
S SYSTEM SETUP
S ADVANCED SETUP
S CHECKOUT
S ALARMS
3
(Up arrow) button to move to the previous
(Down arrow) button to move to the next
(Enter) button to display the first item in
(Menu Up/Exit) button to exit a menu's
(Enter) button to display the first item in
the currently displayed menu.
and
buttons to scroll to the desired
parameter.
(Enter) button to display the value of the
currently displayed item.
button to increase (change) the displayed
parameter value.
button to decrease (change) the displayed
parameter value.
NOTE: When values are displayed, pressing and
holding the
or
display to automatically increment.
(Enter) button to accept the displayed
value and store it in nonvolatile RAM.
(Enter) button to return to the current
menu parameter.
(Menu Up/Exit) button to return to the
previous menu.
button causes the
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