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RESIDENTIAL GAS AND ELECTRIC WATER HEATER
SERVICE HANDBOOK
A.O. Smith Water Products Company Training Department
©2002 Ashland City, Tennessee
22
Residential Electric – continued
Normal Sequence of Operation
C-2 Circuit – Standard on most single element
water heaters.
• Single Element
• Single Thermostat
• Single High Limit
Operation from a cold tank of water.
WIRING DIAGRAM
Note: If used on a normally two element heater,
controls will be located behind the upper service
cover and the element behind the lower service
cover.
Power Enters
Hi
g
h Limi
t
–
L1
a
n
d
L
3
Through High Limit
L1 to T2 and L3 to L4
Thermostat
Post 1995
T2 Contacts
Open
C
-
2 CIRCUIT
Power To Element
Element Heats Water
Thermostat Satisfies
T2 Contacts Open
T2 Contacts Closed