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COOLING WITH VARIABLE SPEED OIL FURNACE
RELAY
THERMOSTAT
PANEL
COOL/HEAT
Y2
2nd STAGE
W3
24VAC HOT
R
R
HEATING -
W2
4th STAGE
HEATING -
W1
3rd STAGE
COOL/HEAT -
Y1
1st STAGE
G
FAN
SOV
O
24VAC
common
B
B
VS MODE -fan
BK
DATA
D
D
REMOTE
RS
INDOOR
RS
SENSOR
ODT
OUTDOOR
SENSOR
ODT
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.
Note: *R is only connected on two-compressor models
18-HD68D1-3
HEAT/COOL
VARIABLE
ONE OR TWO STAGE
SPEED
AIR CONDITIONER
OIL FURNACE
Y
Y2
R
R*
R1
W1
Y1
Y
LO
G
O
B
B
C
BK
OIL BURNER PRIMARY
I D
T
SENSOR
R1
O D
T
SENSOR
COOLING WITH NON-VARIABLE SPEED OIL FURNACE
RELAY
THERMOSTAT
PANEL
Y2
W3
24VAC HOT
R
R
W2
HEATING
W1
Y1
COOLING
G
FAN
O
24VAC
common
B
B
BK
DATA
D
D
REMOTE
RS
INDOOR
RS
SENSOR
ODT
OUTDOOR
SENSOR
ODT
SINGLE STAGE
OIL FURNACE
R
SINGLE STAGE
AIR CONDITIONER
R1
W
Y
Y
G
B
B
C
OIL BURNER PRIMARY
I D
T
SENSOR
R1
O D
T
SENSOR
11
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