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OPERATION
DOAS Operation
The microprocessor control will operate the air handler using one of the five operating modes:
• Cooling
• Heating
• Dehumidification
• Ventilation
• Defrost
Cooling Mode
Cooling mode is activated when the outdoor air temperature sensor detects a temperature increase above the outside air cooling enable set-
point. Outdoor unit compressors modulate to meet the cooling demand by the main coil and maintain discharge air temperature set point.
Heating Mode
Heating mode is activated when the outdoor air temperature sensor detects a temperature decrease below the outside air heating enable
set-point. Electric preheat coil is activated and the SCR controller modulates the percentage output of the heater to maintain minimum
discharge air of 44°F. Outdoor unit compressors modulate to meet the heating demand by the main coil and maintain discharge air
temperature set point.
Dehumidification Mode
Dehumidification mode is activated when the outdoor air humidity sensor detects an outdoor humidity set point. Outdoor unit compressors
will modulate to maintain a coil discharge air set point of 55°F. Reheat coil outdoor unit compressors will modulate to increase the main coil
discharge air up to the discharge air set point.
Ventilation Mode
Ventilation mode (occupied mode) is activated when the air handling unit is turned on and the supply fan runs at constant speed.
Defrost Mode
Defrost mode is activated upon receiving a signal from the main coil outdoor unit that defrost is required. Supply fan remains on and the
discharge air temperature is maintained by the electric preheat coil until the main coil defrost cycle is completed.
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 Life's Good" is a registered trademark of LG Corp.
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