LG AR-DR12-05A Installation And Operation Manual page 122

CONTROLLER
Sequences of Operation
Dehumidification, continued.
Dehumidification Call: The dehumidification call can vary based on installed sensors and user selection. Dehumidification is called when a
sensor is greater than a dehumidification set-point. The following dehumidification modes are available when the space is in occupied mode:
• Inside RH*
• Inside dewpoint*
• Outside dewpoint
• Inside RH or inside dewpoint*
* indicates availability during unoccupied mode.
There must be a constant call for dehumidification for the duration of the enable delay for dehumidification mode to become enabled. The call
remains active until conditions are satisfied and dehumidification mode has been active for the minimum active time.
• Unoccupied Mode: If the unit is unoccupied while there is a dehumidification call, the unit will start and dehumidify until the unoccupied
dehumidification set-points are satisfied. The above dehumidification modes marked with an * indicate availability during unoccupied mode.
The unoccupied dehumidification mode can be set differently than the occupied dehumidification mode.
Dehumidification Priority: The following priorities are used to determine what is more important in the unit: temperature over dehumidification,
or dehumidification over heating. Both priority selections determine when the unit is allowed to dehumidify.
1. Temperature Over Dehumidification: Determines when the unit is allowed to dehumidify based on the space/return air temperatures.
• Temperature: If temperature is set as the priority and the space or return air is overcooled, dehumidification is locked out until the space or
return temperature is no longer overcooled.
• Dehumidification: If the priority is dehumidification and the space or return air is overcooled, the coil offset will be added to the coil leaving
set-point.
• Overcooled: If space or return reset is enabled, the target is considered overcooled when it is 4.0°F below set-point for five (5) minutes. It
remains overcooled until the target is at set-point and overcool has been active for a minimum of five (5) minutes.
2. Heating Over Dehumidification: Determines when the unit is allowed to dehumidify when heating is active.
• Heating: If priority is set to heating, the unit locks out dehumidification while heating is active.
• Dehumidification: If priority is set to dehumidification, the unit is allowed to switch to dehumidification when heating is active.
Preheat
A preheat device can be installed in the unit to preheat outside air coming into the unit.
Availability
1. Modulating Capacity: The following must occur to enable a modulating preheater:
• Preheat is not locked out; and
• The preheat sensor has a valid reading; and
2. Fixed Capacity: The following must occur to enable a fixed preheater:
• Preheat is not locked out; and
• The outside air sensor has a valid reading; and
Preheat Call
1. Modulating Capacity: The preheat call occurs when the preheat temperature is less than the preheat set-point.
2. Fixed Capacity: The preheat call occurs when it is available.
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• Inside RH or inside dewpoint or outside dewpoint
• Inside RH and inside dewpoint*
• Inside RH and inside dewpoint or outside dewpoint
• The outside air damper is greater than the enable position; and
• The system is on.
• The outside air damper is greater than the enable position; and
• The system is on.