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■ For heat pump thermostat with B terminal signal input
CHANGE
OVER_SW
Thermostat Fan & System Switch
FAN
MODE
[Auto / On]
[Cool / Heat / Off]
-
-
OFF
Cool
Auto
Heat
OFF
Cool
ON
Heat
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.
H
24 V~
N
CN_Ther/Oper
CHANGEOVER_SW
RESET_SW
Thermal
Operation
-
0
-
1
RT > SP
1
RT < SP
1
RT < SP
1
RT > SP
1
-
1
RT > SP
1
RT < SP
1
RT < SP
1
RT > SP
1
Thermostat
LG does not supply this section
(Field supply)
H
C
R Y G B
CN_MODE
CN_WIND
SETTING_SW
DISPLAY_LED
TEMP_SW
CN_OUT
Input
FAN
[Y]
[G]
-
-
0
0
1
0
0
0
1
0
0
0
0
1
1
1
0
1
1
1
0
1
Setting and using method
H H
IDU Response
HEAT
[Mode / Thermal / Fan]
[B]
-
Disable Operation
0
Enable
0
Cool / On / On
0
Enable
1
Heat/ On/On
1
Enable
0
Fan/ Off/ On
0
Cool/ On/ On
0
Fan/ Off/ On
1
Heat/ On/ On
1
Fan/ Off/ On
Installation manual 19
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