John Wood Commercial Electric Water Heater - Manual (Page 15)

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FIGURE 13: 6 Element Control Circuit (USA only)
FIGURE 14: 6 Element Power Circuit (USA only)
INPUT
TERMINAL
BLOCK 3A FUSE
CONTROL
TRANSFORMER
HIGH-LIMIT
THERMOSTAT
480V
CONTACTORS
PRIMARY SECONDARY
N
120V
THERMOSTAT
3A FUSE
GROUND
C1
L1
L2
L3
1
4
2
4 3
1
1
2
4
240V
208V
C2 C3 C4
CONTACTORS
LOWER ELEMENTS
L1 L2 L3
T1 T2 T3 C2
INPUT
TERMINAL
BLOCK
(3 PHASE)
L1 L2 L3
BLACK RED BLUE/YELLOW
INPUT
TERMINAL
BLOCK
(SINGLE PHASE)
L1 L2 L3
BLACK/BLUE RED/YELLOW
L1 L2 L3
T1 T2 T3 C1
FUSE HOLDER
WITH 30A FUSES
BLACK BLACK BLUE RED
YELLOW
RED
BLACK BLACK BLUE RED
YELLOW
RED
CENTER ELEMENTS
L1 L2 L3
T1 T2 T3 C4
L1 L2 L3
T1 T2 T3 C3