LG Dry Contact Installation Manual page 10

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.
L
AC 24 V
N
18 Dry contact for thermostat
C R
Security
Emergency Stop
Occupancy Sensor
Reference Cases
n For conventional thermostat signal input
AC 24 V
Thermostat Fan & System Switch
FAN MODE
Operation
[Auto / On] [Cool / Heat / Off]
- - - 0
OFF - 1
RT > SP 1
Cool
Auto RT < SP 1
RT < SP 1
Heat
RT > SP 1
FAN - 1
RT > SP 1
Cool
RT < SP 1
ON
RT < SP 1
Heat
RT > SP 1
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.
Setting and using method
Thermostat
LG does not supply this section
L
(Field supply)
N
L L L
C R G W Y
Input
IDU Response
FAN HEAT COOL
[Mode / Thermal / Fan]
[G] [W] [Y]
- - - Disable Operation
0 0 0 Off
1 0 1 Cool / On / On
0 0 0 Enable
1 1 0 Heat/ On/On
0 0 0 Off
1 0 0 Fan/ Off/ On
1 0 1 Cool/ On/ On
1 0 0 Fan/ Off/ On
1 1 0 Heat/ On/ On
1 0 0 Fan/ Off/ On
※ RT : Room Temperature
※ SP : Set Point
Installation manual 19