Hydronic Heating Boilers and Domestic Water Heaters Installation and Service Manual

48
WIRING DIAGRAMS - MAIN UNIT CONNECTIONS
MODELS 495,000 - 745,000 BTU/HR
POWER
SWITCH
120 VAC
TRIAL
24 VAC
HEATING
24VAC FLAME
FAILURE
BK
W
GY
GY
O
Y
BL
PR
HI-LIMIT
C
N
O
N
C
C
2
1
AUX
HI-LIMIT
OPTIONAL
CN
O
N
C
C21
14
5
9
10
12 15
36
8
7
13
BK/W
11
BK
O
R
R
BK
INLET
SENSOR
H
HI-LIMITS - PWR SW
JUMPERED IF
NOT PROVIDED
DISCONNECT POWER BEFORE SERVICING THE UNIT
T
=
TAN
Y
=
Y
E
LLOW
B
R
=B
R
O
WN
G
=
G
R
EEN
GY= GR
A
Y
R
=
R
E
D
W
=
W
H
ITE
B
K
=
B
L
ACK
PR=PU
R
P
LE
B
L
=BLUE
P
=
P
I
NK
O=OR
A
N
G
E
x
MATING
BLOCKS
SPLICE
SPLICE
LOW GAS
HIGH GAS
N
O
C
O
MNC
O
P
TIO
N
AL HIG
H
-LO
W
G
A
S PRESSURE
N
O
C
O
MNC
BL
BL
PR
24VAC COM
OPT. REMOTE
THERMOSTATS
O
N
/OFF (HIGH
F
IRE)
(LOW FIRE)
OPTIONAL
FLOW
SWITCH
X & B =
INTERMITTENT PUMP
CONNECT TO:
R1 - W1 =
CONTINUOUS PUMP
COM
NC
NO
WHEN REPLACING DAMAGED WIRING, USE EQUIVALENT TYPE AND GAUGE.
D
O
TTED LIN
E
S IND
I
C
A
T
E
OPTION
A
L
EQU
I
PMENT
U
N
L
ESS OTH
E
R
W
ISE
IN
D
I
C
A
T
ED
W
BR
W
BR
1
2
SHUTOFF
VALVE
NORMALLY
OPEN VENT
VALVE
OPTIONAL
SHUTOFF/ NORMALLY OPEN
VENT VALVE
120VAC
120VAC
GAS TRAIN
R1 W1 R2 W2 A X B C
STA GE 1
STAGE 2
LIMITS
14
5
36
1
2
4
5
9
10
11
12
14
15
36
8
713
45
9
1012
15
3
6
87
13
1
O
R/O
R/O
O/W
PR
11
SPLICE
1
2
W
BR
O/W
PR
Y
OPTIONAL
SYSTEM/
TANK
SENSOR
Y
R/O
BK
BK
BK/W
GY
GY
Y
W
H
D
ACCS.
PLUG
G
TERMINAL STRIP - SENSOR
O
P
STA
N
D
A
RD
BL
O
O
P
T. BOX.
O
P
T. BOX.
NOT USED
PR
O
14
5
36
24V
DC
1
2
9
10
11
123
8
7
1
2
12
4
3
6
87
SPLICE 10
14
5
10
11
12
14
36
7
13
SPLICE 1
PUMP DELAY RELAY
"24VDC"COIL
D
E
F
A
B
BK/W
BK
O
O
SPLICE 9
G
24COM
GND
CONTROL PANE
SPLICE
3
C
OPTION BOX CONNECTOR
PIN
S
1 &
2
JUMPERED
P
R
OVIDE
D
IF N
O
O
P
TIO
N
S
A
R
E
OR
D
E
R
E
D
SPLICE 4
SPLICE 2
SPLICE 7
S2/FS
F1
F2
LINE
S1
NEU
5
4
1
2
3
GY/W
TH
10
PI
9
8
24COM
NOT
USED
O
P
BK
W
G
1
2
4
5
7
10
11
12
14
13
3
6
BR
GY
PR/W
IGNITION
MODULE
RESET
7
24VAC
6
5
PS
4
3
M/S
2
FF
1
T
BL/W
PR/W
MV
BL/W
BL
R
B
BL
FLAME FAIL RESET
IGNITION MODULE
SPLICE
BK
BL
P
R
9
LOUVER
NOCOM NC
T
BL
5
R
E
SET
N
O
R
M
ALLY
C
L
OS ED
P
R
8
24 VAC
CO N
T
R
O
L
J
3
5
4
6
1
2
3
O.C.
J1
J2
3
2
1
J4
P
GND
GND
P
R
BL
BL
Y
Y
Y
Y
P
R
G
G
O
P
P
PR
TIME
DELAY
1
2
3
4
BR
6
Y
SPLICE
7
O
W
R
T
Y
G
T
OPTION BOX "C"
O/W
T
T
BR
BR
O
B
R
N
O
C
C
T
NO
NO C
Y
C
BR /W
O
P
O