16
THERMOSTAT WIRING DIAGRAM
© 2011 American Water Heater Company. All Rights Reserved
WIRING NO. 9
DOUBLE ELEMENT NON-
INTERLOCKING (SIMULTANEOUS)
LOWER
ELEMENT
ELECTRICAL
SERVICE
GROUND
GROUND
SCREW
RED
UPPER
ELEMENT
YELLOW
LOWER THERMOSTAT
WITH HIGH LIMIT
CONTROL
BLACK
YELLOW
4
3
BLUE
RED
3 PHASE BRANCH CIRCUIT
DOUBLE ELEMENT SIMULTANEOUS
UPPER THERMOSTAT
WITH HIGH LIMIT
CONTROL
BLUE
L3
L2
L1
2
1
3
4
1
1
2
1
BLACK
2
2
FUSED DISCONNECT
OR CIRCUIT BREAKER
120
V
1500*
2000
2500
3000
3500
4000
4500
5000
5500
6000
9000
12000
15
20
30
30
-
-
-
-
-
-
-
-
WATT
LOAD
BRANCH CIRCUIT SIZING GUIDE
Based on N.E.C. NFPA NO. 70 - 1999
15
15
15
20
20
25
30
30
35
35
50
70
15
15
15
15
20
20
25
30
30
30
45
60
208
V
240
V
Recommended
Over Current
Protection Rating
(Amperage)
12
10
10
8
-
-
-
-
-
-
-
-
14
14
14
12
10
10
10
10
8
8
6
3
14
14
14
12
12
10
10
10
10
8
6
4
120
V
208
V
240
V
Copper Wire Size
AWG Based on
N.E.C.
Table 310 - 16
C)
protection
UPPER
ELEMENT
BLUE
YELLOW
BLACK
UPPER THERMOSTAT
WITH HIGH LIMIT
CONTROL
4
2
1
3
4
1
2
BLACK
LOWER
ELEMENT
3 PHASE BRANCH CIRCUIT
DOUBLE ELEMENT
(NON-SIMULTANEOUS)
LOWER THERMOSTAT
WITH HIGH LIMIT
CONTROL
RED
L3
L2
L1
YELLOW
BLUE
ELECTRICAL
SERVICE
GROUND
GROUND
SCREW
1
2
1
2
FUSED DISCONNECT
OR CIRCUIT BREAKER
LOWER
ELEMENT
BLACK
BLACK
BLUE
BLUE
UPPER
ELEMENT
YELLOW
YELLOW
L1
L2
FUSED DISCONNECT
OR CIRCUIT BREAKER
RED
UPPER
THERMOSTAT
&
HIGH LIMIT
CONTROL
GROUND
SCREW
ELECTRICAL
SERVICE
GROUND
WIRING NO. 6
INTERLOCKING
(NON-SIMULTANEOUS) WIRING
FOR DOUBLE ELEMENT HEATER
LOWER
THERMOSTAT
BLACK
BLACK
L1
L2
FUSED DISCONNECT
OR CIRCUIT BREAKER
RED
THERMOSTAT
&
HIGH LIMIT
CONTROL
WIRING NO. 7
SINGLE ELEMENT HEATER
RED
HEATING
ELEMENT
GROUND
SCREW
ELECTRICAL
SERVICE
GROUND
WHITE
BLACK
BLACK
HOT
WHITE
THERMOSTAT
&
HIGH LIMIT
CONTROL
NEUTRAL
FUSED DISCONNECT
OR CIRCUIT BREAKER
WIRING NO. 1
SINGLE ELEMENT HEATER
HEATING
ELEMENT
GROUND
SCREW
ELECTRICAL
SERVICE
GROUND
GROUND
SCREW
LOWER
ELEMENT
BLACK
RED
BLACK
UPPER THERMOSTAT
WITH HIGH LIMIT
CONTROL
LOWER THERMOSTAT
WITH HIGH LIMIT
CONTROL
UPPER
ELEMENT
RED
BLACK
BLACK
L1
L2
L2
L1
RED
RED
4
3
ELECTRICAL
SERVICE
GROUND
2
1
3
4
1
1
2
1
2
2
FUSED DISCONNECT
OR CIRCUIT BREAKER
INTERLOCKING
BLACK
LOWER
ELEMENT
RED
UPPER
ELEMENT
YELLOW
OPTIONAL OFF-PEAK SERVICE CONTACT
GROUND
SCREW
2
2
LOWER THERMOSTAT
WITH HIGH LIMIT
CONTROL
BLUE
UPPER THERMOSTAT
WITH HIGH LIMIT
CONTROL
YELLOW
ELECTRICAL
SERVICE
GROUND
4
2
1
L2
L1
3
4
1
BLUE
1
1
BLACK
2
FUSED DISCONNECT
OR CIRCUIT BREAKER
WIRING NO. 13
DOUBLE ELEMENT
(NON-SIMULTANEOUS)
