Installation manual
19
ENGLISH
Setting and using method
NOT
USE
CHANGE
OVER_SW
VOL
T
NON
VOL
T
CHANGEOVER_SW
RESET_SW
CN_Ther/Oper
CN_MODE
CN_WIND
CN_INDOOR
DISPLAY_LED
TEMP_SW
SETTING_SW
CN_OUT
CN_PI485
Thermostat
LG does not supply this section
(Field supply)
LOW
MIDDLE
HIGH
H
H
N
H H
Operation
Thermal
FA
N
HEA
T
COMM
C
24 V~
R Y G B
■
For heat pump thermostat with B terminal signal input
Thermostat Fan & System Switch
Input
IDU Response
[Mode / Thermal / Fan]
FAN
[Auto / On]
MODE
[Cool / Heat / Off]
Operation
Thermal
[Y]
FAN
[G]
HEAT
[B]
-
-
-
0
-
-
-
Disable Operation
Auto
OFF
-
1
0
0
0
Enable
Cool
RT > SP
1
1
0
0
Cool / On / On
RT < SP
1
0
0
0
Enable
Heat
RT < SP
1
1
0
1
Heat/ On/On
RT > SP
1
0
0
1
Enable
ON
OFF
-
1
0
1
0
Fan/ Off/ On
Cool
RT > SP
1
1
1
0
Cool/ On/ On
RT < SP
1
0
1
0
Fan/ Off/ On
Heat
RT < SP
1
1
1
1
Heat/ On/ On
RT > SP
1
0
1
1
Fan/ Off/ On
Notes
• Thermostats that close contacts "O" or "B" during Cool or Heat call only have not been verified. "O"
and/or "B" contact closure must be maintained during respective cycle / mode selection.
• 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.
