18-HD68D1-3
11
R
G
Y1
W1
B
24VAC HOT
24VAC
common
COOLING WITH NON-VARIABLE SPEED OIL FURNACE
FAN
DATA
COOLING
OIL BURNER PRIMARY
HEATING
W2
O
R
G
W
Y
Y
B
T
T
SINGLE STAGE
AIR CONDITIONER
SINGLE STAGE
OIL FURNACE
B
C
W3
Y2
BK
R1
R1
RELAY
PANEL
D
THERMOSTAT
R
B
D
REMOTE
INDOOR
SENSOR
RS
RS
I D
SENSOR
OUTDOOR
SENSOR
ODT
ODT
O D
SENSOR
COOLING WITH VARIABLE SPEED OIL FURNACE
R
G
Y1
W1
W1
B
24VAC HOT
COOL/HEAT
2nd STAGE
24VAC
common
VS MODE -fan
FAN
SOV
DATA
COOL/HEAT -
1st STAGE
HEATING -
3rd STAGE
HEATING -
4th STAGE
W2
O
R
G
Y
LO
Y1
B
BK
VARIABLE
SPEED
OIL FURNACE
B C
W3
Y2
Y
Y2
BK
R1
Note: Remove the "R" to "BK" jumper at the low voltage control board.
Note: Cut the factory installed "R" to "O" jumper at the LVTB.
Note: Blower delay profiles must be turned off. See indoor unit
service facts for details.
R*
O
ONE OR TWO STAGE
AIR CONDITIONER
OIL BURNER PRIMARY
T
T
R1
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
R
G
Y1
W1
B
24VAC HOT
24VAC
common
RELAY
PANEL
COMMUNICATING
FURNACE
COMMUNICATING FURNACE WITH 24V OUTDOOR
24V FROM RELAY PANEL
FAN
SOV
DATA
COOL/HEAT -
1st STAGE
HEATING -
3rd STAGE
HEATING -
4th STAGE
W2
O
R
G
W2
Y1/
Y
LO
Y1
B
ONE OR TWO STAGE
HEAT PUMP
D
D
W1
B
C
W3
Y2
COOL/HEAT
-2nd STAGE
BK
VS MODE -fan
Y/
Y2
Y2
BK
THERMOSTAT
R
B
D
O
O
R
X2
Note: Enable "BK" (turn on dehumidifier switch or cut “BK” jumper).
Note: Dual fuel switch on Relay Panel must be set to DUAL.
Note: Blower delay profiles must be turned off. See indoor unit
service facts for details.
REMOTE
INDOOR
SENSOR
RS
RS
I D
SENSOR
OUTDOOR
SENSOR
ODT
ODT
O D
SENSOR
