5
Fig. 9 - Typical Indoor Fan Motor
Access Panel Locations
Indoor Fan Motor
Access Panel
Heating Access
Panel
Thermostat
Connection
Access Panel
Center Post
Fig. 10 - Mixed Air Sensor Placement
Supply Air
Temperature
Sensor
Mounting
Location
Supply Air
Temperature
Sensor
To Unit
Control Box
EconoMi$er X
EconoMi$er X is a low leak economizer system which is available for
2-stage cooling units equipped with the SAV 2-speed Variable Frequency
Drive (VFD) system.
The field-installed accessory consist of the following:
•
Low leak economizer assembly
•
W7220 economizer controller
•
20K dry bulb temperature control sensor
W7220 Economizer
The economizer controller used on electro mechanical units is a
Honeywell W7220 which is to be located in the RTU base unit’s Control
Box. See the Installation Instruction for your base unit for the location of
the Control Box access panel.
The W7220 controller provide 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 keypad on
the front of the economizer controller.
Fig. 11 - W7220 Controller
Keypad
The four navigation button (see Fig. 3) are used to scroll through the
menus and menu items, select menu items, and to change parameter and
configuration settings.
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 Setpoints, System and 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 previous
menu.
Menu Structure
Table 5 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
