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OPERATION & SERVICE
Servicing should only be performed by a Qualified Service Agent
30
Contactor Configurations
This illustration shows how contactors are configured and how they provide power to the
heating elements on Electronic Control Model water heaters, This is a redundant contactor
configuration - two contactors must close their contacts to energize any heating element.
Elements and Banks are numbered according to how the control system monitors them -
see Element Sensors pages 27 and 28. There are two contactors installed for each Bank.
IE: the illustration shows a 9 element configuration, a water heater factory equipped with 6
heating elements would have 4 contactors and a water heater with 3 elements would have 2
contactors. Wiring is shown for the first two heating elements in Bank 1 only for simplicity.
BANK 1 (LOWER) BANK 2 (MIDDLE) BANK 3 (UPPER)
1 2 3
Blk Blk Blu
1 2 3
Red Yel Red
4 5 6
Red Yel Red
4 5 6
Blk Blk Blu
7 8 9
Blk Blk Blu
7 8 9
Red Yel Red
7
8
9
4
5
6
1
2
3
BANK 1 (LOWER)
BANK 2 (MIDDLE)
BANK 3 (UPPER)
Heating Elements
Element Numbers/Connections
Wire Colors to Elements
Heating Element Banks
Power
Connection
Terminals
Contactors
4 5 6
Red Yel Red
4 5 6
Blk Blk Blu
LEGEND