American Water Heater STCE3-52/80/119 ユーザーズマニュアル

Servicing should only be performed by a Qualified Service Agent

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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

 

 

 

 

 

 

 

 

 

BANK 1 (LOWER)

BANK 2 (MIDDLE)

BANK 3 (UPPER)