A.O. Smith TC-049-R2 Service Handbook, Residential Gas And Electric Water Heater, Circuit, Model

RESIDENTIAL GAS AND ELECTRIC WATER HEATER

SERVICE HANDBOOK

Residential Electric – continued

Surface Mounted Thermostat (s) and High Limit (s)

The thermostats and high limits are held against the side of the tank. As the tank surface heats or cools, a metal disc inside of the control expands or contracts to open or close electrical contacts in the controls.

They will satisfy within 10°F of setting. The tank surface has to cool 8 - 15°F to reactivate these controls.

			Newer		Temperature
Model	Circuit	Older Models	Models1	Location	Range °F
259T-Style 4100	A-6, A-7	X A-6		Upper Tank	110-170
259T-Style 4000	A-6, A-7,	X	X	Lower Tank	110-170
	C-2
389T33	A-6		X	Upper Tank	90-150
389T13	C-2, A-7		X	Lower Tank	90-150
259T-Style 4000	A-6		X	Lower Tank	90-150
2AW-Style 7135	A-7	X	X	Upper Tank	110-170
466T-Style 4400	A-6, A-7,	X	X	Lower Tank	190°
	C-2
389T	A-6, A-7,		X		170°
	C-2

1”Older” = series 916 or older.

“Newer” = series 917 or more current – (Began approximately January, 1996)

2Older 59T controls had a maximum setting of 170°F. Replacement 59T controls will stop at 150°F.

389T controls are combination High Limit/Thermostat, one piece controls.

466T limits may be mounted onto 59T thermostats.

66T4400

59T4100

Thermostat

59T4100

Combination High Limit &

Thermostat

89T 33

A.O. Smith Water Products Company	20	Training Department
©2002		Ashland City, Tennessee