A.O. Smith Kuwait, Instruction Manual

Page: 12 / 48

12
TWO WIRE CIRCUIT FOR NON-SIMULTANEOUS
OPERATION, HAS SINGLE HIGH LIMIT CONTROL
A-6
1
2
2 4
1
L2
L1
SUPPL
Y
LEADS
BLACK RED
2
1 3
4
YELLOW
RED
BLACK
JUNCTION
BOX
LOWER HEATING
ELEMENT
THERMOSTAT
UPPER
HEATING
ELEMENT
UPPER
THERMOSTAT
HI-TEMP
LIMIT
SWITCH
GND
JUNCTION
BOX
HI-TEMP
LIMIT
SWITCH
THERMOSTAT
HEATING
ELEMENT
BLACK
1
2
2
1 3
4
BLACK
RED
T
O POWER SUPPL
Y
RED
L1 L2
SUPPLY LEADS
STANDARD SINGLE ELEMENT
C-2
GND
BOTH CIRCUITS PROTECTED BY HI-LIMIT
SWITCH. FOR 3 PHASE SYSTEMS, SEPARATE
BLACK WIRES AND PROVIDE 3 PHASE POWER
SOURCE.
SUPPLY LEADS
L2
L1
1
2
2
1 3
4
1
2
2
1 3
JUNCTION
BOX
UPPER
HI-TEMP
LIMIT SWITCH
UPPER
THERMOSTAT
LOWER
HI-TEMP
LIMIT SWITCH
UPPER
HEATING
ELEMENT
LOWER
THERMOSTAT
LOWER
HEATING
ELEMENT
BLACK
BLACK
BLACK
BLACK
D
E
R
D
E
R
RED
T
O POWER
SUPPL
Y
RED
*NOTE: SOME LOWER HI-TEMP. LIMIT
SWITCHES MAY HAVE 4 TERMINALS. USE
ONLY THE 2 TERMINALS ON LEFT.
4
JUNCTION
BOX
SUPPLY LEADS
GND
L1
L2 L3
P-4
SIMULTANEOUS OPERATION
3 PHASE UNBALANCED
400-415V ONLY
P-4
SIMULTANEOUS OPERATION
3 PHASE UNBALANCED
220-240V
BLACK
BLACK
RED
T
O POWER
SUPPL
Y
RED
L1 L2
YELLOW
BLUE
L1 L2
SUPPLY
CIRCUIT
#1
SUPPLY
CIRCUIT
#2
A-9
L3
WIRING DIAGRAMS
Figure 3