LG ARNU363DDA4 Installation Manual page 35

W7220 Economizer Module Wiring, continued�
Table 10: Economizer Module – Right Hand Terminal Blocks.
Label Type
Top Right Terminal Block
AUX2 I 24 VAC IN
OCC 24 VAC IN
E -GND E-GND
EXH1 24 VAC OUT
AUX1 O 24 VAC OUT
Bottom Right Terminal Block
Y 2-1 24 VAC IN
Y2-O 24 VAC OUT
Y1-I 24 VAC IN
Y1-O 24 VAC OUT
C COM
R 24 VAC
Time-Out and Screen Saver
When no buttons have been pressed for ten minutes, the LCD displays a screen saver, which cycles through the status items. Each status
item displays in turn and cycles to the next item after five (5) seconds.
Operation
Cooling, Unit with Economizer
For occupied mode operation of Economizer, there must be a 24V signal at terminals R and OCC. Removing the signal at OCC places the
Economizer control in unoccupied mode.
During occupied mode operation, indoor fan operation will be accompanied by economizer dampers moving to minimum position set point for
ventilation. If indoor fan is off, dampers will close. During unoccupied mode operation, dampers will remain closed unless a cooling (by free
cooling) or DCV demand is received.
When free cooling using outside air is not available, the unit cooling sequence will be controlled directly by the space thermostat.
Outside air damper position will be closed or minimum position as determined by occupancy mode and fan signal.
When free cooling is available as determined by the appropriate changeover command, a call for cooling (Y1 closes at the thermostat) will
cause the economizer control to modulate the dampers open and closed to maintain the unit supply air temperature. Default supply air tem-
perature is 53°F with a range of 38°F to 70°F.
When space temperature demand is satisfied (thermostat Y1 opens), dampers return to minimum damper position if indoor fan is running or
fully closed if fan is off. Damper movement from full closed to full open (or vice versa) will take between 1-1/2 and 2-1/2 minutes.
Heating with Economizer
During occupied mode operation, indoor fan operation will be accompanied by economizer dampers moving to minimum position set point for
ventilation. If indoor fan is off, dampers will close.
During unoccupied mode operation, dampers will remain closed unless a DCV demand is received. When the room temperature calls for heat
(W1 closes), the heating controls are energized.
N/A
Shut Down (SD) or Heat (W) Conventional Only and Heat Pump
Programmable: Exhaust Fan 2 Output or ERV or System Alarm Output
Y2 in - Cooling Stage 2 Input from Space Thermostat
Y2 out - Cooling Stage 2 Output to Stage 2 Mechanical Cooling
Y1 in - Cooling Stage 2 Input from Space Thermostat
Y1 out - Cooling Stage 2 Output to Stage 2 Mechanical Cooling
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
ECONOMIZER CONTROLLER
Description
The First Terminal Is Not Used
Changeover (O?B) in Heat Pump Mode
Occupied / Unoccupied Input
Earth Ground - System Required
Exhaust Fan 1 Output
24 VAC Common
24 VAC Power (Hot)
Menu Structure
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