American Water Heater COMMERCIAL ELECTRIC WATER HEATERS Contactor Configurations, Contactors

OPERATION & SERVICE

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	4	5	6	4	5	6	7	8	9	7	8	9
Red Yel Red			Blk Blk Blu			Red Yel Red			Blk Blk Blu			Red Yel Red

7
8
9	BANK 3 (UPPER)
4
5
6	BANK 2 (MIDDLE)
1
2
3	BANK 1 (LOWER)
Contactors	Heating Elements

Power

Connection

Terminals

4 5 6	4 5 6	Heating Element Banks
Blk Blk Blu	Red Yel Red

Element Numbers/Connections

Wire Colors to Elements

LEGEND

Servicing should only be performed by a Qualified Service Agent

30