A.O. Smith TC-049R3 Service Handbook page 32

RESIDENTIAL GAS AND ELECTRIC WATER HEATER
Residential Electric – continued
WIRING DIAGRAM
A-6 Circuit
•
2 Elements
•
2 Thermostats
•
1 High Limit
- Standard on dual
A-6 Circuit
element water heaters non-simultaneous/interlocked operation
Operation: From cold tank of water
Power Enters High-Limit
Through High Limit
Upper Thermostat
L /T Contacts Open
1 4
Power Interrupted to Upper Element
L /T Open
1 2
A.O. Smith Water Products Company
©2005
SERVICE HANDBOOK
A-6 Circuit - Post 1995
L /T Contacts Closed
1 2
Power to Upper /Element
Element Heats Water
Upper Thermostat Satisfied
Switch Power to Lower Thermostat
L /T Closed
1 4
Lower Thermostat Contacts Open
31
.
Lower Thermostat
Contacts Closed
Power to Lower Element
Element Heats Water
Lower Thermostat
Satisfied
Power Interrupted to
Lower Element
Lower 1, 2 Open
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