National Products BW3 Boiler User Manual


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Fig. 7—Unit Wiring Diagram
NOTE: If any of the original wire as supplied with the boiler must be replaced, it must be replaced with the same wire or its equivalent.
A96142
L1 L2
L1
3
B
R
L2 T T
C1 C2 B1 B2
B1
R
B
B2
C2C13
T T
24 V. SECONDARY
24 V. THERMOSTAT
CIRCULATOR
DRAFT INDUCER
OVERCURRENT
PROTECTED
DISCONNECT
AT 140C TRANSFORMER
TO GAS
VALVE
HI LIMIT
120 V. PRIMARY
24 V. SECONDARY
PRESSURE
SWITCH
INTERMITTENT
PILOT CONTROL
6 (24V)
5
24V
GND
120 V. PRIMARY
120/60/1 POWER SUPPLY
HOT NEUT
1K
1K2
1K1
123456 9
R
BW
BBT
BW
GW BBT B
B
PV
TO PILOT
VR8204A/VR8304M
GAS VALVE
PRESSURE
SWITCH
CIRCULATOR
AT 140C TRANSFORMER
INTERMITTENT PILOT
CONTROL
S8600F - NATURAL
GAS
S8600M - NATURAL
OR
PROPANE
GAS
DRAFT INDUCER
24V
THERMOSTAT
L8148A
AQUASTAT
120/60/1 POWER SUPPLY
POWER SUPPLY
OVERCURRENT
PROTECTED
DISCONNECT
NEUT
HOT
FLAME
ROLLOUT
SAFETY
SHUTOFF
PV/MV
MV
W
G
R
O
MV
MV/PV
PV
GND
24V-GND
24V
SPARK
LINE VOLTAGE WIRING
CLASS II, 24 VOLT WIRING
CLASS II, 24 VOLT FIELD WIRING
BLACK
BLACK WITH TRACER
WHITE
GREEN
RED
ORANGE
B
BT
W
G
R
O
=
=
=
=
=
=
FLAME
ROLLOUT
SAFETY
SHUTOFF
—12—
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