John Wood Commercial Electric Water Heater - Manual (Page 11)

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FIGURE 5: Control Circuit (Canada)
INPUT
TERMINAL
BLOCK
3A FUSE
OPTIONAL CONTROL
TRANSFORMER (USED ON 480 OR 600V ONLY)
HIGH-LIMIT
THERMOSTAT
480 OR 600V
CONTACTORS
PRIMARY SECONDARY
RED
BLACK N
240V
THERMOSTAT
C3
(IF APPLICABLE)
FOR 3 ELEMENTS CONFIGURATION. ONLY C1
WITH CORRESPONDING WIRING APPLIES.
FOR 6 ELEMENTS CONFIGURATION. ONLY C1, C2
WITH CORRESPONDING WIRING APPLIES.
FOR 9 ELEMENTS CONFIGURATION. CIRCUIT IS AS SHOWN.
3A FUSE
GND
RED RED
RED RED
RED
BLACK
BLACK
C2
(IF APPLICABLE)
C1
L1
L2
L3
1
4
2
4 3
1
1
2
4
BLACK
FIGURE 6: 3 Element Power Circuits (Canada)
INPUT
TERMINAL
BLOCK
(1 PHASE)
CONTACTOR
RED BLACK
LOWER ELEMENTS
BLACK
BLACK
BLACK
RED
RED
RED
L1 L2
L1 L2 L3
T1 T2 T3
CONTACTOR
YELLOW BLACK
LOWER ELEMENTS
L1 L2 L3
T1 T2 T3 C1
BLUE
L1 L2 L3
YELLOW BLACK BLUE
C1
INPUT
TERMINAL
BLOCK
(3 PHASE)