RESIDENTIAL GAS AND ELECTRIC WATER HEATER
SERVICE HANDBOOK
Residential Electric – continued
WIRING DIAGRAM
A-6 Circuit
• 2 Elements
• 2 Thermostats
• 1 High Limit
A-6 Circuit - Standard on dual
element water heaters non-simultaneous/interlocked operation.
A-6 Circuit - Post 1995
Operation: From cold tank of water
Power Enters Hi
g
h-Limit
Throu
g
h Hi
g
h Limit
U
pp
er Thermostat
L1/T4 Contacts Open L1/T2 Contacts Closed
Power to U
pp
er /Element
Element Heats Water
U
pp
er Thermostat Satisfied
Power Interrupted to Upper Element
L1/T2 Open
Lower Thermostat
Contacts Closed
Power to Lower Element
Element Heats Water
Power Interrupted to
Lower Element
Lower 1, 2 Open
Lower Thermostat
Satisfied
Switch Power to Lower Thermostat
L1/T4 Closed
Lower Thermostat Contacts O
p
en
A.O. Smith Water Products Company Technical Training Department
©2005 Ashland City, TN
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