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User Interface — The user interface consists of a 2-line LCD
display and a 4-button keypad on the front of the economizer
controller.
Fig. 40 — W7220 Controller Button Description
Keypad — The four navigation buttons (see Fig. 40) are used
to scroll through the menus and menu items, select menu items,
and to change parameter and configuration settings.
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 menusTo use the keypad when
working with Setpoints, 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
▲
(Up arrow) and
▼
(Down arrow) 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
previous menu.
Menu Structure — Table 13 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
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 designated as (Cooling) Supply Air Temperature or SAT
sensor.
Setup and Configuration — Before being placed into service,
the W7220 Economizer module must be setup and configured
for the installed system.
The setup process uses a hierarchical menu structure that is
easy to use. Press the and arrow buttons to move forward and
backward through the menus and press the button to select and
confirm setup item changes.
See Table 14 for damper minimum position settings and
readings on the checkout menus.
Time-Out and Screen-Saver — When no buttons have been
pressed for 10 minutes, the LCD displays a screen saver, which
cycles through the Status items. Each Status items displays in
turn and cycles to the next item after 5 seconds.
1 and 2 Speed Fan Operation — For 1-speed fan dry bulb and
enthalpy operation see Tables 15-18. For 2-speed fan operation
IMPORTANT: Table 13 illustrates the complete hierar-
chy. Menu parameters may be different depending on
the configuration.
For example if there is no DCV (CO
2
) sensor, then
none of the DCV parameters appear and only MIN POS
will display. If a CO
2
sensor is used, the DCV MIN and
DCV MAX will appear AND if there is a 2 speed fan
DCV MIN (high and low speed) and DCV MAX (high
and low speed) will appear.
IMPORTANT: During setup, the Economizer module is
live at all times.
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Страница 38: ...38 Fig 44 Typical RTU Open System Control Wiring Diagram with Perfect Humidity ...
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