13
EconoMi$er X System
The field-installed accessory consists of the following:
• Low leak economizer assembly
• HH79AH001 OA Dry Bulb Sensor
• HH79AH001 Mixed Air Sensor and Harness
• W7220 Controller
• 50HEHMRAE--A10 Harness (not used on 3 speed units)
W7220 ECONOMIZER CONTROLLER
The economizer controller used on electro-mechanical units is a
Honeywell W7220 which is to be located in the RTU base unit’s
control box. See Fig. 31 for button description of the W7220
controller. See the Installation Instruction for your base unit for
the location of the Control Box access panel.
USER INTERFACE
The user interface consists of a LCD display and a 4-button
keypad on the front of the economizer controller.
KEYPAD
The four navigation buttons (see Fig. 31) 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:
• 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.
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 6 illustrates the complete hierarchy of menus and
parameters for the EconoMi$er X system.
The Menus in display order are:
• STATUS
• SETPOINTS
• SYSTEM SETUP
• ADVANCED SETUP
• CHECKOUT
• ALARMS
Fig. 31 —
W7220 Controller
