Carrier BW4 Installation, Start-Up, And Operating Instructions Manual page 13

BOILER WITH TANKLESS HEATER COIL
24 VOLT THERMOSTAT
FIELD WIRING
NEUT
BK W
120V
HOT
POWER
SUPPLY
L1 L2
OVERCURRENT
PROTECTED
DISCONNECT
B2 C2
W
CIRCULATOR
PUMP
COLOR CODE
BK-BLACK
O-ORANGE
Y-YELLOW
L8124C
R-RED
INTERNAL
WIRING
W-WHITE
Fig. 13—Wiring Diagrams for Boilers With and Without Tankless Heater Coil
A
L8124C
T T AQUASTAT
C1 ZC
R
BK
ZR B1
BK
R4184
W
RELAY
CAD CELL
W
BK Y
F
O
F
Y
R
BK BK
IGNITION OIL BURNER
TRANSFORMER MOTOR
G
T T L1
L2
1K
W R B
1K1
LOW LIMIT/
CIRCULATOR
ZR
ZC
B
HIGH LIMIT
R B1
1K2
B2
C1
C2
BOILER WITHOUT TANKLESS HEATER COIL
120/60/1 OVERCURRENT PROTECTED DISCONNECT
G L1 L2
3
B
R
C1 C2
B
W
GND
L1
(HOT)
CIRCULATOR
L2
L1
T
L2
—13—
LINE
NEUTRAL
24 V THERMOSTAT
FIELD WIRING
T T
L8148A
AQUASTAT
B1 B2
B
B W
B
B
W
R4184D
O
RELAY
W
B
B
JUMPER
1K1
T 3
1K 1K2
C1
C2
COLOR CODE
B=BLACK
W=WHITE
O=ORANGE
Y=YELLOW
LINE
VOLTAGE
CLASS II
24 VOLTS
OIL BURNER
MOTOR
IGN
TRANS
Y
F
CAD
CEL
F
Y
R
B2 B1
A95610