Setting and using method
16
Dry contact for thermostat
Installation manual
17
ENGLISH
Setting and using method
n
Details of Installation for thermostat
1) In case of Occupancy sensor,
- When motion is detected by the sensor, Indoor unit is enabled.
- Otherwise, Indoor unit is disabled.
2) In case of Emergency Stop or Security option.
- When emergency condition occurs, Indoor unit is disabled.
- Otherwise, Indoor unit is enabled.
Reference Cases
C
AC 24 V
L
N
R
Security
Emergency Stop
Occupancy Sensor
Notes
• IDU Fan logic, depending on model selected, may delay IDU fan operation momentarily during a cold
start heat call. This function allows IDU coil to warm up prior to operating fan in some IDU models.
• Thermostats that use resistive anticipation are not supported at this time.
• Verify documentation of desired thermostat so that the logic is same as shown in the table above.
Thermostat
LG does not supply this section
(Field supply)
LOW
MIDDLE
HIGH
L
L
N
L L
Operation
FA
N
HEA
T
COOL
COMM
C
AC 24 V
R G W Y
n
For conventional thermostat signal input
Thermostat Fan & System Switch
Input
IDU Response
[Mode / Thermal / Fan]
FAN
[Auto / On]
MODE
[Cool / Heat / Off]
Operation
FAN
[G]
HEAT
[W]
COOL
[Y]
-
-
-
0
-
-
-
Disable Operation
Auto
OFF
-
1
0
0
0
Off
Cool
RT > SP
1
1
0
1
Cool / On / On
RT < SP
1
0
0
0
Enable
Heat
RT < SP
1
1
1
0
Heat/ On/On
RT > SP
1
0
0
0
Off
ON
FAN
-
1
1
0
0
Fan/ Off/ On
Cool
RT > SP
1
1
0
1
Cool/ On/ On
RT < SP
1
1
0
0
Fan/ Off/ On
Heat
RT < SP
1
1
1
0
Heat/ On/ On
RT > SP
1
1
0
0
Fan/ Off/ On
※
RT : Room Temperature
※
SP : Set Point
