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Section 5. Field Wiring Diagrams
DUAL FUEL VARIABLE SPEED GAS FURNACE
RELAY
THERMOSTAT
PANEL
COOL/HEAT
Y2
-2nd STAGE
W3
24VAC HOT
R
R
HEATING -
W2
4th STAGE
W1
HEATING -
3rd STAGE
COOL/HEAT -
Y1
1st STAGE
G
FAN
SOV
O
24VAC
common
B
B
BK
VS MODE -fan
DATA
D
D
REMOTE
RS
INDOOR
RS
SENSOR
ODT
OUTDOOR
SENSOR
ODT
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.
DUAL FUEL 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: Dual fuel switch on Relay Panel must be set to DUAL.
Note: BT (Bonnet Thermostat) model THT1248 (BAYSEN03ATEMPAA)
required for dual fuel, oil furnace applications.
8
DUAL FUEL
TWO STAGE
VARIABLE SPEED
ONE OR TWO STAGE
GAS FURNACE
HEAT PUMP
Y/
Y2
Y2
R
R
W2
W1
X2
Y1/
Y1
Y
LO
G
O
O
B
B
C
BK
I D
SENSOR
O D
SENSOR
VARIABLE
SPEED
ONE OR TWO
OIL FURNACE
STAGE HEAT PUMP
Y
Y2
R
R
R1
BT
W1
X2
Y1
Y
LO
G
O
O
B
B
C
BK
OIL BURNER PRIMARY
I D
T
SENSOR
R1
O D
T
SENSOR
DUAL FUEL NON-VARIABLE SPEED GAS FURNACE
RELAY
THERMOSTAT
PANEL
Y2
W3
24VAC HOT
R
R
HEATING -
W2
3rd STAGE
HEATING -
W1
2nd STAGE
COOL/HEAT -
Y1
1st STAGE
G
FAN
SOV
O
24VAC
common
B
B
BK
DATA
D
D
REMOTE
RS
INDOOR
RS
SENSOR
ODT
OUTDOOR
SENSOR
ODT
Note: Dual fuel switch on Relay Panel must be set to DUAL.
DUAL FUEL WITH NON-VARIABLE SPEED OIL FURNACE
RELAY
THERMOSTAT
PANEL
Y2
W3
24VAC HOT
R
R
HEATING -
W2
3rd STAGE
HEATING -
W1
2nd STAGE
COOL/HEAT -
Y1
1st STAGE
G
FAN
SOV
O
24VAC
common
B
B
BK
DATA
D
D
REMOTE
RS
INDOOR
RS
SENSOR
ODT
OUTDOOR
SENSOR
ODT
Note: Dual fuel switch on Relay Panel must be set to DUAL.
Note: BT (Bonnet Thermostat) model THT1248 (BAYSEN03ATEMPAA)
required for dual fuel, oil furnace applications.
NON-V.S. ONE
SINGLE STAGE
OR TWO STAGE
HEAT PUMP
GAS FURNACE
R
R
W2
W/
X2
W1
Y
Y
G
O
B
B
C
I D
SENSOR
O D
SENSOR
NON-VARIABLE
SPEED
SINGLE STAGE
OIL FURNACE
HEAT PUMP
R
R
R1
BT
W/
X2
W1
Y
Y
G
O
B
B
C
OIL BURNER PRIMARY
I D
T
SENSOR
R1
O D
T
SENSOR
18-HD68D1-3
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