A.O. Smith Dura-Power DRE - 120 Instruction Manual

Designed for use as a recovery heater having its own
storage tank. Note: Not recommended for sanitizing
water application.
FEATURES
GLASS-LINED TANK - Three sizes; 52, 80 and 119 gallon
(189, 300, 450 Liter) capacity. Tank interior is coated with
glass specially developed by A.O. Smith Ceramic Research
for water heater use. Tanks rated at 150 psi (1034 kPa)
working pressure (ASME 160 psi [1100 kPa]). Foam
insulation reduces costly heat loss, and is vermin proof.
ELEMENTS - Incoloy sheathing for longer life. Low watt
density; means lower surface temperature to minimize scale
buildup and more surface to heat water. Element sizes from
3 to 6 Kw. Use 3, 6 or 9 elements standard; total of 6 to 54
Kw input (see chart on back).
STANDARD VOLTAGES - 208, 240 and 480V single-phase
and three-phase delta; 277V single-phase also available.
TERMINAL BLOCK - Factory installed. Just bring the service
to the heater and connect to block.
CONTROLS - One temperature control adjustable through a
range of 120° to 180°F (49° to 82°C) and manual reset high
temperature cutoff per element. Thermostat step control may
be achieved by varying settings on individual temperature
controls. Located behind hinged control compartment door
for quick, easy access.
OTHER STANDARD FEATURES
• Simplified circuitry, color coded for ease of service • Two
anode rods for maximum corrosion protection • Cabinet has
bonderized undercoat with baked enamel finish • Bottom
inlet and top outlet openings • Brass drain valve • C.G.A./
ASME temperature and pressure relief valve • Single panel
control box.
OPTIONAL
FUSING - Protects all elements, thermostats, and internal
wiring circuits against excess current flow. Meets Canadian
Electric Code requirements.
Manifold kits with gate valves - available for multiple
installation.
ASME 160 psi tank construction.
GOLDENROD ELEMENTS - All DRE models are available with the Goldenrod 24K gold plated elements (patent pending).
Goldenrod elements provide long life and 6 times the scaling resistance of standard incoloy elements. Goldenrod elements
carry a three-year warranty against failure due to scale.
Revised June 2001
COMMERCIAL ELECTRIC
WATER HEATERS
DRE-52, 80, 120
Meets or exceeds the requirements of ASHRAE 90.1b-
1992 Standard for energy efficiencies.
ASME
(OPTIONAL)
LIMITED WARRANTY OUTLINE
If the tank should leak any time during the first three
years, under the terms of the warranty, A.O. Smith will
furnish a replacement heater; installation, labor,
handling and local delivery extra. THIS OUTLINE
IS NOT A WARRANTY.
For complete information, consult the written warranty
or A. O. Smith Water Products Company.
A 211.0C