John Wood Commercial Electric Water Heater - Manual (Page 14)

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FIGURE 11: 3 Element Control Circuit (USA only)
FIGURE 12: 3 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
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