36
Split Compact Dedicated Outdoor
Air System Installation Manual
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.
ELECTRICAL SYSTEM
Field-Mounted Sensors
All field-mounted sensors are designed to be connected to the
DOAS terminal strip. All sensors and end devices for the unit have
been factory-wired with the exception of the following items listed.
Table 20: Field-Mounted Sensors.
Sensor Type
Mounting Location
Space Temperature
Wall Mounted in the Conditioned Space
Space Humidity
Wall Mounted in the Conditioned Space
Space CO
2
Wall Mounted in the Conditioned Space
Pressure Switch
OA Filter
Differential Pressure
In the DOAS Unit (for EA CFM)
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(Example: Space Reset Control, CO
2
Control).
Space Temperature and Humidity Sensors
When a unit is designed with space temperature and humidity reset, both a wall-mounted temperature sensor and a wall-mounted humidity
sensor need to be purchased and installed at the field. Both sensors must be mounted in the space served by the DOAS unit at a height of
approximately five (5) feet from the floor. Two (2) individual sensors are field-provided to prevent interference, but the individual enclosures
may be installed on a wall immediately next to each another. Field-supplied wiring between the ventilator and the temperature sensor must
be 18 AWG, two-conductor, twisted, stranded, shielded. Terminations must be made following the table below.
Table 21: Space Temperature Sensor Terminations.
Space Temperature Sensor
Type No. 1
NTC 10k
Terminal Strip TB @ NTC Module
RI1
G
Type No. 2
0~10Vdc
Terminal Strip TB @UI Module
UI5
G
LG recommends NTC type sensors (MAMAC SYSTEMS
®
TTE-205-EX-12-0 for temperature sensors, MAMAC SYSTEMS HU-225
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needs an additional setting on the controller base for the minimum -
maximum sensor values. (MAMAC SYSTEMS is a registered trademark
of MAMAC SYSTEMS, INC.)
Field-supplied wiring between the DOAS unit and the space humidity sensor must be 18 AWG, two-conductor, twisted, stranded, shielded.
Terminations must be made following the table below.
Table 22: Space Humidity Sensor Terminations.
Space Humidity Sensor
Type
0~10Vdc
Terminal Strip TB @ UI Module
UI6
G
Space CO
2
Sensor
When a unit is designed with CO
2
control, it will be necessary to field-supply a CO
2
sensor (A Honeywell® C7232A wall mount CO
2
sensor is
recommended). LG DOAS includes a CFM modulation controls sequence based on the CO
2
value. The sensor must be mounted in the space
at a height of approximately five (5) feet from the floor. Field-supplied communication cable between the ventilator and the space CO
2
sensor
must be 22 AWG, three-conductor, twisted, shielded, and stranded. Terminations must be made following the table below. (Honeywell is a
registered trademark of Honeywell International Inc.)
Table 23: Space CO
2
Sensor Termination @ Main Module.
Space CO
2
Sensor
Type
0~10Vdc
Terminal Strip TB @ Main Module
UI8
G
Field-Mounted Sensors
Check the upper and lower limits of the sensor range. To display the correct temperature value, the upper and lower limit values of the range must be
set through the controller. Example: CO
2
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