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The W7220 control also i ncludes a new capability that
will adjust the damper control points during DCV or
minimum ventilation operation as the indoor fan speed is
change d. This control function ensures that required space
ventilation airflow quantities are maintained during
reduce d fan speed operation.
Additional control capabilities include automatic
detection of new sensors a nd detection of sensor fa ilure or
loss of communication.
The W7220 control module includes an integral user
interface with keypad and LCD display that permits direct
input of setpoint values and configurations and display of
status and alarms.
The W 7220 controller is locate d in the RTU base unit’s
Control Box. See the Installati on Instructions for this base
unit for the location of the Control Box access panel.
User Interface —
The user interface consists of a 2--line L CD display and a
4--button keypad on the front of the economi zer controller.
2 LINE
LCD
MENU UP
(EXIT)
BUTTON
SCROLL
UP/DOWN
BUTTONS
SELECT
(ENTER)
BUTTON
C14206
Fig. 44 -- W7220 Controller
Keypad
The four navigation buttons (see Fig. 44) are used to scroll
through t he menus and menu items, select menu items,
and to change parameter and configuration setti ngs.
Using the Keypad with Menus
To use the keypad when working with menus:
S Press the
(Up arrow) button to move t o the previous
menu.
S Press the
(Down arrow) button to move to the next
menu.
S Press the
(Enter) button to display the first item in
the currently displayed menu.
S Press the
(Menu Up/Exit) button to exit a menu’s
item and return to the list of menus.
The Menus in display order are:
S ST ATUS
S SETPOINTS
S SYSTEM SETUP
S ADVANCED SETUP
S CHECKOUT
S ALARMS
Using the Keypad with Settings and Parameters
To use the keypad when working with Setpoints, System
and Advanced Settings, Checkout tests and Alarm s:
1. Navigate to the desired menu.
2. Press the
(Enter) button to display the first item in
the current ly displayed menu.
3. Use the
and buttons to scroll to the desired pa-
rameter.
4. Press the
(Enter) button to display the value of the
currently displayed item.
5. Press the
button to increase (change) the displa yed
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
(MenuUp/Exit)buttontoreturntothe
previous menu.
Menu Structure
IMPORTANT: Table 5 illustr ates the complete hierarch y.
Your menu parameters may be dif ferent depending on
your configuration. For example if you do not have a
DCV (CO
2
) sensor, then none of the DCV parameters
appear.
The menu hierarchy has been modified to reflect controller
configuration for 2--speed indoor fan application in the
Staged Air Volume option.
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 located after the cooling coil, in the fan
section, where it is de signated as (Cooling) Supply Air
Tempera ture or SAT sensor.
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