Connection Diagram - A.O. Smith 400 - 2100 Installation & Operation Manual

10

Connection diagram

(continued)
SILENCING ALARM
SWITCH BELL
BL
1
1
PR
2
2
PR
PR
ALARM
CONTACTS
PR
P
RUN
RUN
24VAC
TIME
P
O
ALARM & RUN TIME CONTACTS
LOUVER PROVING
LOUVER RELAY
LOUVER
T
W
PROVING
T
SWITCH
BR
LOUVER
CONTACTS
BR
CONNECTION BOARD
1
SYSTEM/TANK
+
2 + SENSOR
TANK
SENSOR
3 + B2 INTERMITTENT
4 + B1 LIMITS
5 + A2 CONTINUOUS
6 + A1 LIMITS
7 + 2 NO HIGH FIRE
8 + 2 C ENABLE
9 + 1 NO LOW FIRE
10 + 1 C ENABLE
CHASSIS
G
GROUND
GROUND
G
GROUND
PUMP OUT BR
PUMP IN
BR
W
NEUTRAL 120VNEU
BK
LINE
MAIN TERMINAL
BLOCK
66
BL
TD RLY
24VAC BL
PR/BK
Y
BL
Y 1 4
4 1
BL/W
O 2 5
5 2
R
3 6
6 3
PR
ARM
24VAC
T
PR
PR/
BL
BK
120VAC
BK/W
1 1 BK/W
W
2 2 120VNEU
3 3
4 4
T
T/W
O
O/BK
BR/W
6 1
BR/W
7 2
8 3
O/BK
9 4
R/W
10 5
R/BK
BL
24VAC
PR
G
G
R/BK
GW
Y
24VCOM
Installation & Operation Manual
12
24VAC
24VCOM
24VCOM
W
O
R
PR
BR/W
BR/W
O/BK
24VCOM
GY
-
5
GY
4
GY 3
2
1
GY
O
10
P
9
8
BL/W 7
6
R
5
T/W 4
PR/
1
BK
BK/W
BK
R
120VAC
C NO NC
HIGH/LOW FIRE
RELAY SOCKET
C NO
TOP VIEW
R
R/BK
OUTLET SENSOR
BR
BR
INLET SENSOR
PR
PR
OPERATOR
24
12
Y 24V COM (-) 24V(+) BL
24VAC
11 23
N/A ALARM
PR
22
10
N/A N/A
22
IN / OUT COM
9
N/A
22
BR 8 INLET SENSOR N/A
22
OUTLET SENSOR N/A
7
18
6 TANK SENSOR STAGE 2 OUT R/W
17
N/A STAGE 2 IN
5 R
16
O
4 TANK COM STAGE 1 OUT
15
N/A STAGE 1 OUT O/BK
3
14
HEAT DEMAND PUMP OUT T
2
13
Y DEMAND COM PUMP IN
1 BL 24VAC
2-STAGE THERMOSTAT
+
F1
BK
S1
F2
BK/W
BK 120VAC
-
W
+
BK
W
120VNEU
S2/FS
TH
PI
Y
24VCOM
RESET
BL
24VAC
MV
PS
IGNITION
MODULE
M/S
FF
T
BK
BR BR
C
24VCOM
ON/OFF
NO
BK
SWITCH
PUMP RELAY
24VAC
120VAC
BK/W
O
O/BK
12
NC
2
R/BK