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EconoMi$er X
The field- installed accessory consists of the following:
S
Economizer assembly
W7220 economizer controller
S
HH79ZZ007 mixed (or supply) air sensor
S
HH79ZZ007 outside air temperature sensor
S
48TMHSRSE-A20 harness
S
W7220 Economizer
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 the Installation
Instruction for your base unit for the location of the
Control Box access panel.
The W7220 controller provides the following"
S
2-line LCD interface screen for setup, configuration and
troubleshooting
On-board fault detection and diagnostics
S
Sensor failure loss of communications identification
S
Automatic sensor detection
S
Capabilities for use with multiple-speed indoor fan systems
S
User Interface
The user interface consists of an LCD display and a
4- button keypad on the front of the economizer controller.
Keypad
The four navigation buttons are used to scroll through the
menus and menu items, select menu items, and change
parameter and configuration settings. See Fig. 32.
Fig. 32 - W7220 Controller
Using the Keypad with Menus
To use the keypad when working with menus:
S Press
(Up arrow) button to move to previous menu.
S Press
(Down arrow) button to move to next menu.
S Press
(Enter) button to display first item in
currently displayed menu.
S Press
(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 desired menu.
2. Press
(Enter) button to display first item in the
currently displayed menu.
3. Use
and
buttons to scroll to desired parameter.
4. Press
(Enter) button to display value of the
currently displayed item.
5. Press
button to increase (change) the displayed
parameter value.
6. Press
button to decrease (change) the displayed
parameter value.
NOTE: When values are displayed, pressing and holding
or
button causes the display to automatically
increment.
7. Press
(Enter) button to accept the displayed value
and store it in nonvolatile RAM.
8. "CHANGE STORED" displays.
9. Press
(Enter) button to return to current menu
parameter.
10. Press
(Menu Up/Exit) button to return to previous
menu.
Menu Structure
Table 8 illustrates the complete hierarchy of menus and
parameters for the EconoMi$er X system.
The Menus in display order are:
S STATUS
S SETPOINTS
S SYSTEM SETUP
S ADVANCED SETUP
S CHECKOUT
S ALARMS
19
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