17
GENERAL JADE 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
Control Box. See the base unit’s Installation Instructions for
the location 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
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 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 previ-
ous menu.
Menu Structure
Table 11 illustrates the complete hierarchy of menus and pa-
rameters for the EconoMi$er X system.
The Menus in display order are:
• STATUS
• SETPOINTS
• SYSTEM SETUP
• ADVANCED SETUP
• CHECKOUT
• ALARMS
Programming the Jade 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 stan-
dard application with a single outside air sensor.
NOTE: Instead of setting the SETPOINTS, you can use the de-
faults already set in the Jade controller – see default settings be-
low. See Table 10 for summarized standard settings or, for more
detail, see Table 11 – Menu Structure.
SETPOINTS
• MAT SET: this sets the mixed air temperature (MAT) set-
ting. The controller has a default of 53°F, but the range is
anywhere from 38°F to 70°F.
• LOW T LOCK: This setting locks out the compressor (or
mechanical cooling) at a given temperature. The default is
32°F, but the controller’s range is from –45°F to 80°F.
• DRYBULB SET: if you have an economizer with a dry
bulb outside air sensor, you will see and set the DRY-
BULB SET. The default setting is 63°F but the controller’s
range is 48°F to 80°F.
• ENTH CURVE: if you have a single enthalpy outside air
sensor instead of a dry bulb, you will see and set the ENTH
CURVE setting. There are 5 setting options: ES1 thru ES5.
Check Table 7 for the limits for each of these settings. ES3
is the default setting.
• MIN POS: The minimum position allows for ventilation
even when not in the free-cooling mode. If you have a sin-
gle speed unit there will be only one minimum position
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
2
) sensor.
