A.O. Smith TC-049-R2 manual Service Handbook, Residential Gas And Electric Water Heater, B A C

RESIDENTIAL GAS AND ELECTRIC WATER HEATER

SERVICE HANDBOOK

Residential Electric – continued

Since the element (s) are - very nearly - totally immersed in the tank, thermal efficiency is assumed to be 100%. – all of the Btu (Watts) generated, enter the water.

B.

A.

C.

•Watt Density = the density of the wattage output of the element compared to the surface area of the element (i.e. “High Watt Density Element” will have the most wattage per square inch of element surface. If the above elements generated 4,500 w. each, “B” might be considered a “high” watt density element, “A” a medium and “C” a low.)

•Voltage Notes:

120 volt AC circuit

240 volt AC circuit

(Hot)

L1 L2

L1 to Ground = 120 Volts

L2 to Ground = 0 Volts

L1 L2

(Hot) (Hot)

L1 or L2 to Ground = 120 Volts

L1 L2 = 240 Volts

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