10 18-HD68D1-3
R
G
Y1
W1
B
24VAC HOT
24VAC
common
COOLING WITH VARIABLE SPEED INDOOR
FAN
DATA
COOLING -1st
HEATING -1st
HEATING -2nd
W2
O
R
G
W1
W2
Y/
Y1
B
ONE OR TWO STAGE
AIR CONDITIONER
TWO STAGE VS
GAS FURNACE or
VS AIR HANDLER
& ELECTRIC HEAT
B
C
W3
HEATING -3rd
Y2
COOLING-2nd
BK
VS MODE -fan
Y/
Y2
Y2
BK
Y1/
Y
LO
O
R*
W3
D
THERMOSTAT
R
B
D
Note: Enable "BK" (turn on dehumidifier switch or cut “BK” jumper).
RELAY
PANEL
REMOTE
INDOOR
SENSOR
RS
RS
I D
SENSOR
OUTDOOR
SENSOR
ODT
ODT
O D
SENSOR
Note: *R is only connected on two-compressor models
R
G
Y1
W1
B
24VAC HOT
24VAC
common
COOLING WITH NON-VARIABLE SPEED INDOOR
FAN
DATA
COOLING -1st
HEATING -1st
HEATING -2nd
W2
O
R
G
W/
W1
W2
Y
Y
B
SINGLE STAGE
AIR CONDITIONER
ONE OR TWO STAGE
GAS FURNACE or
AIR HANDLER &
ELECTRIC HEAT
B
C
W3
HEATING -3rd
Y2
BK
W3
RELAY
PANEL
D
THERMOSTAT
R
B
D
REMOTE
INDOOR
SENSOR
RS
RS
I D
SENSOR
OUTDOOR
SENSOR
ODT
ODT
O D
SENSOR
R
G
Y1
W1
B
24VAC HOT
24VAC
common
FAN
DATA
SOV
COOL/HEAT -
1st STAGE
HEATING -
3rd STAGE
HEATING -
4th STAGE
W2
O
R
G
W1
W2
Y1
Y
B
ONE OR TWO STAGE
AIR CONDITIONER
AIR HANDLER
W3
HEATING -
5th STAGE
Y2
COOL/HEAT -
2nd STAGE
VS MODE -fan
Y2
Y2
W3
O
R*
B
Note: First stage blower air flow is set on air handler interface control board.
Note: Remove the “R” to “BK” jumper at the low voltage control.
BK
BK
RELAY
PANEL
D
THERMOSTAT
R
B
D
REMOTE
INDOOR
SENSOR
RS
RS
I D
SENSOR
OUTDOOR
SENSOR
ODT
ODT
O D
SENSOR
Communicating Air Handler in 24 Volt Mode
Note: *R is only connected on two-compressor models
R
G
Y1
W1
B
24VAC HOT
24VAC
common
COOLING WITH *AM7 AIR HANDLERS
FAN
DATA
COOLING -1st
HEATING -1st
HEATING -2nd
W2
O
R
G
W1
W2
Y
B
ONE OR TWO STAGE
AIR CONDITIONER
AIR HANDLER
B
BK
W3
HEATING -3rd
Y2
COOLING-2nd
VS MODE -fan
Y2
Y2
Y1
O
R*
W3
Yo
BK
Note: Remove the factory installed "BK" jumper at the indoor unit.
RELAY
PANEL
D
THERMOSTAT
R
B
D
REMOTE
INDOOR
SENSOR
RS
RS
I D
SENSOR
OUTDOOR
SENSOR
ODT
ODT
O D
SENSOR
Note: *R is only connected on two-compressor models
HEAT/COOL
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