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GENERAL JADE W7220 CONTROLLER AND
SENSOR INFORMATION
W7220 Economizer
The economizer controller used on electromechanical
units is the Honeywell W7220 which is to be located in the
RTU base unit's control box. See Fig. 35 for button descrip-
tions of the W7220 controller. The W7220 controller pro-
vides 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
Fig. 35 — W7220 Controller
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. 35) are used to scroll
through the menus and menu items, select menu items, and
change parameter and configuration settings.
Using the Keypad with Menus
To use the keypad when working with menus:
•
Press ▲ (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
Setup Advanced Settings, Checkout Tests and Alarms:
1.
Navigate to the desire 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 pre-
vious menu.
Menu Structure
Table 11 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
IMPORTANT: The default setting on the W7220 con-
troller is for a Fan Type" with 2 speed. For a 1 (single)
speed unit, the setting under SYSTEM SETUP > FAN
TYPE must be changed to 1 speed.
PROGRAMMING JADE W7220 CONTROLLER
The next several pages detail the different status displays,
setpoints, setup, and alarms available on the controller. This
list below and Table 10 summarizes the inputs required for a
standard application with a single outside air sensor.
NOTE: Default settings already set in the Jade controller may be
used instead of setting the SETPOINTS; 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 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 to 80°F.
•
DRYBULB SET: for an economizer with a dry bulb out-
side air sensor, set the DRYBULB SET. The default set-
ting is 63°F but the controller's range is 48 to 80°F.
•
ENTH CURVE: for a single enthalpy outside air sensor in-
stead of a dry bulb, set the ENTH CURVE setting. There
are 5 setting options: ES1 through ES5. Check the econo-
mizer literature 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. A single speed
unit has only one minimum position setting. The default is
4.4 volts, but the range is 2-10Vdc.
•
MIN POS H and MIN POS L: A 2 speed unit has 2 mini-
mum position settings that show up on the menu. The first
is MIN POS H (for high speed) which has a default of 4.4
volts. The second is MIN POS L (for low speed), which
has a default of 6.0. Note that MIN POS H and MIN POS
L are only displayed if under SYSTEM SETUP: AUX2 IN
is set to "W1" and FAN TYPE is set to 2 speed.
16
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