Table of Contents
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GENERAL W7220 CONTROLLER
AND SENSOR INFORMATION
W7220 Economizer
The economizer controller used on electromechanical units is a
Honeywell W7220, which is located in the RTU base unit's Con-
trol Box. See the base unit's Installation Instructions for the loca-
tion of the Control Box access panel.
The W7220 controller provides the following:
•
2-line LCD interface screen for setup, configuration, and
troubleshooting.
•
On-board fault detection and diagnostics
•
Sensor failure loss of communications identification
•
Automatic sensor detection
•
Capabilities for use with multiple-speed indoor fan systems
User Interface
The user interface consists of a LCD display and a 4-button key-
pad on the front of the economizer controller.
Keypad
The four navigation buttons (see Fig. 37) are used to scroll
through the menus and menu items, to select menu items, and to
change parameter and configuration settings.
Fig. 37 — W7220 Controller
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 set points, system and ad-
vanced 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 cur-
rently displayed item.
5.
Press the ▲ button to increase the displayed parameter value.
6.
Press the ▼ button to decrease 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.
The message "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 11 illustrates the complete hierarchy of menus and parame-
ters for the EconoMi$er X system.
The Menus in display order are:
•
STATUS
•
SETPOINTS
•
SYSTEM SETUP
•
ADVANCED SETUP
•
CHECKOUT
•
ALARMS
IMPORTANT: The default setting on the W7220 controller
is for a "Fan Type" with 2 speed, which is correct for 2 or
3 speed units (48/50LC 07-12). For a 1 (single) speed unit,
the setting under SYSTEM SETUP > FAN TYPE must be
changed to 1 speed.
IMPORTANT: Table 11 illustrates the complete hierarchy.
Menu parameters may be different depending on configura-
tion. For example, none of the DCV parameters appear for a
system that does not have a DCV (CO
Programming the W2770 Controller
The next several pages detail the different status displays, set
points, setup, and alarms available on the controller. The list below
and Table 10 summarize the inputs required for a standard applica-
tion with a single outside air sensor.
NOTE: Instead of setting the SETPOINTS, you can use the de-
faults already set in the controller – see default settings below. See
Table 10 for summarized standard settings or, for more detail, see
Table 11 — Menu Structure.
19
) sensor.
2
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