LG Dry Contact Installation Manual page 23

Setting and using method
n For heat pump thermostat with O terminal signal input
H
24 V~
N
CHANGE
OVER_SW
CN_Ther/Oper
CHANGEOVER_SW
RESET_SW
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
ON RT < SP 1
RT < SP 1
Heat
RT > SP 1
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.
18 Dry contact for thermostat
Thermostat
LG does not supply this section
(Field supply)
H H H
C R Y G O
CN_MODE
CN_WIND
SETTING_SW
DISPLAY_LED
TEMP_SW
CN_OUT
Input
IDU Response
Thermal FAN COOL
[Mode / Thermal / Fan]
[Y] [G] [O]
- - - Disable Operation
0 0 0 Off
1 0 1 Cool / On / On
0 0 1 Off
1 0 0 Heat/ On/On
0 0 0 Off
0 1 0 Fan/ Off/ On
1 1 1 Cool/ On/ On
0 1 1 Fan/ Off/ On
1 1 0 Heat/ On/ On
0 1 0 Fan/ Off/ On
※ RT : Room Temperature
※ SP : Set Point
n For heat pump thermostat with B terminal signal input
H
24 V~
N
CHANGE
OVER_SW
CN_Ther/Oper
CHANGEOVER_SW
RESET_SW
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
OFF - 1
RT > SP 1
Cool
ON RT < SP 1
RT < SP 1
Heat
RT > SP 1
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.
Setting and using method
Thermostat
LG does not supply this section
(Field supply)
H H H
C R Y G B
CN_MODE
CN_WIND
SETTING_SW
DISPLAY_LED
TEMP_SW
CN_OUT
Input
IDU Response
Thermal FAN HEAT
[Mode / Thermal / Fan]
[Y] [G] [B]
- - - Disable Operation
0 0 0 Off
1 0 0 Cool / On / On
0 0 0 Off
1 0 1 Heat/ On/On
0 0 1 Off
0 1 0 Fan/ Off/ On
1 1 0 Cool/ On/ On
0 1 0 Fan/ Off/ On
1 1 1 Heat/ On/ On
0 1 1 Fan/ Off/ On
※ RT : Room Temperature
※ SP : Set Point
Installation manual 19