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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:
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Low leak economizer assembly
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W7220 economizer controller
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20K dry bulb temperature control sensor
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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:
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2--line LCD interface screen for setup, configuration
and troubleshooting.
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On--board fault detection and diagnostics
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Sensor failure loss of communications identification
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Automatic sensor detection
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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.
2 LINE
LCD
MENU UP
(EXIT)
BUTTON
SCROLL
UP/DOWN
BUTTONS
SELECT
(ENTER)
BUTTON
C11548
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:
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Press the
(Up arrow) button to move to the previous
menu.
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Press the
(Down arrow) button to move to the next
menu.
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Press the
(Enter) button to display the first item in
the currently displayed menu.
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Press the
(Menu Up/Exit) button to exit a menu’s
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
(Enter) button to display the first item in
the currently displayed menu.
3. Use the
and
buttons to scroll to the desired
parameter.
4. Press the
(Enter) button to display the value of the
currently displayed item.
5. Press the
button to increase (change) the displayed
parameter value.
6. Press the
button to decrease (change) the displayed
parameter value.
NOTE
: When values are displayed, pressing and
holding the
or
button causes the
display to automatically increment.
7. Press the
(Enter) button to accept the displayed
value and store it in nonvolatile RAM.
8. “CHANGE STORED” displays.
9. Press the
(Enter) button to return to the current
menu parameter.
10. Press the
(Menu Up/Exit) button to return to the
previous menu.
Menu Structure
Table 2 illustrates the complete hierarchy of menus and
parameters for the Economizer X system.
The Menus in display order are:
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STATUS
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SETPOINTS
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SYSTEM SETUP
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ADVANCED SETUP
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CHECKOUT
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ALARMS
LLECO
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01
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I