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Hydronic Heating Boilers and
Domestic Water Heaters
64
WIRING BOX CONNECTIONS - WIRING DIAGRAM A
399,999 - 750,000 BTU/HR MODELS
PR
BR
12
3
56
4
24VAC XFMR.
ELECTRONIC
CONTROLLER
DISPLAY BOARD
ALARM
ENABLE RELAY
24V
SENSOR
CONNECTOR
CIRCUIT
BREAKER
120V
24V
OPTIONAL
FLAME FAIL
ENABLE RELAY
24V
BKW
BLY
Y
Y
S2/FS
F2
F1
S1
NEU
4
2
3
11
-
+
-
+
IGNITIO
N
MODULE
TH
10
PI
9
8
24COM
RESET
7
24VAC
6
MV
5
PS
4
3
M/S
2
FF
1
LINE
LINE
IGN 1
IGN 1
P1
S1
S2
S2+
S2-
+24
COM
ALR
RST1
2
3
4
5
6
7
8
9
1
12
YPR
Y
P
BL
PR/
BK
Y
P
123
PR/
BK
OPTIONAL
PR Y BL
PR/
BK
5
4
3
2
1
5
4
3
2
1
RUNTIME RELAY
1
2
3
4
TO
LWCO
5
6 1 3 9 8 7 1412
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1011
1
2
3
4
5
6
7
8
9
321
PR/
BK
3
1
6
5
4
9
7
2
5
1
15
TO
LWCO
3
1
6 5 4
9
7
P
P
Y
Y
GY
O
P
Y
BL
R
T/W
PR/
BK
GY
W
BK
GY
GY
BL/W
BR
W
PR
BR/W
T
PR/BK
BK
W
T
BK
G W
BK/
W
R
T
P
P
T/W
R/
BK
R/O
PR
Y
O/
BK
O/
B
K
1
2
3
4
BL
BK
BL/
BK
R
R/O
GY
GY
P
R/BK
R
BK
PR/BK
Y
W
BL
PR
Y
Y BL
BR
W
BR/W
T
PR/BK
R/O
R
R/O
BL/BK
R/BK
O
R/BK
O/BK
BR
BL/W
BL
1
2
3
BL
A
B
C
4
G
E
D
F
F
CHASSIS
GROUND
24V
COMMON
BL
AC POWER
CONNECTOR
WIRING BOX
CONNECTOR
MAIN UNIT
CONNECTOR
IGNITER
CONNECTOR
14
15
16
17
18
19
20
21
22
23
13
24
n/a
n/a
TH
41
5 6
9 7
BL
BL/
BK
Y
BL/
BK
W
Y
GY
TUBING
SHRINK
CONNECTED UNLESS
ALARM ADDED
LBL20009 REV ACONNECTION - WIRING DIAGRAM A
CONTROL BOX CONNECTIONS
1
2
3
4
5
6
7
8
9
10
11
12
IGN2
IGN2
P2
S3
S4
S2+
S2-
RST2
1
2
3
4
5
6
7
8
9
10
R
NOT
USED
PR
8
STG
#2
2
R/
B
K
2
3
4
5
6
7
8
9
1
12
14
15
16
17
18
19
20
21
22
23
13
24
n/a
n/a
HEAT DEM 2
TANK/OA COM
OA SEN
TANK SEN
OUT SEN
INLET SEN
IN/OUT COM
HDCOM
COM
n/a
n/a
PUMP
S1 IN
S1 OUT
S2 IN
S2 OUT
S3 IN
S3 OUT
n/a
n/a
ALARM
PUMP
24V
ELECTRONIC TEMPERATURE
CONTROLLER PIN OUTS
R/
BK
Y R/O Y
ALARM
STG #2
YO BK/R WBK
R
CO
M
24V
FAN
3
BK/
W
R
R/
O
G
OPTIONAL
GROUND
GY
CAUTION
120VAC
STG
#3
BK/R BK
R/O
R/O
R/BK
THREE STAGE
MODELS ONLY
R/BK
STG #1
1
36
7
4
5
9
BK
BK/
W
5
6
4
1
3
2
NEU
SINGLE IGNITION MODULE UNIT
10
9
8
7
6
5
4
1
12
11
9
8
7
6
5
4
3
2
1
HEAT DEM 1
LIMITS
7
4
6
5
O
R
T= TA N
Y=YELLOW
BR=BROWN
G=GREEN
GY=GRAY
W = WHITE
BK = BLACK
PR=PURPLE
BL=BLUE
P=PINK
O=ORANGE
Y/G = YELLOW WITH GREEN STRIPE
R=RED
WIRE COLOR CODES
EXAMPLE:
FLAME CURRENT
TEST POINTS
NOTE:
WHEN REPLACING DAMAGED WIRING, USE EQUIVALENT TYPE AND GAUGE
.
CHASSIS GROUND
PR
J3
54
6
1 2
3
O.C.
J
1
J2
3
2
1
J4
P
GND
RESET
O
PR
PR
Y
Y
9
BL
BL/
BK
BL
RESET
PR
PR
T
13
TEST
T
T
24 VAC
LWCO