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COMMERCIAL ELECTRIC
WATER HEATERS
DVE–125 THRU 10,000
DHE–200 THRU 10,000
STANDARD FEATURES
GLASS-LINED TANK — Tank interior is coated with glass
specially developed for use in water heaters. Tanks rated at
125 psi working pressure; 150 psi or 160 psi working pressure
is optional. Vermin proof fiber glass insulation reduces costly
heat loss. Constructed to Section IV of ASME code, and UL
standards. Tanks have channel skid base. A 4" x 6" handhole
is furnished on 500, 600 and 700 gallon models; 11" x 15"
manhole is furnished on 800 gallon and larger sizes.
INCOLOY IMMERSION HEATERS — Heavy-duty medium watt
density elements (three/immersion heater) have incoloy
sheathing: provide excellent protection against oxidation and
scaling. The input ranges from 15KW to 3000KW (see
accompanying chart).
AVAILABLE WITH OPTIONAL GOLDENROD ELEMENTS —
All models are available with the Goldenrod 24K gold plated
elements (patent pending). Goldenrod Elements provide longlife and five times the scaling resistance of standard incoloy
elements. Goldenrod Elements carry a three-year warranty
against failure due to scale.
FUSING — Control and power circuit fusing to meet N.E.C.
PILOT SWITCH AND LIGHT — Provided on front of heater;
permits manual starting and stopping of heater by interrupting
power to control circuit.
OTHER STANDARD FEATURES
• Color coded circuitry for easier servicing • Anode rods for
maximum corrosion protection • Standard voltages include 208,
240, 480, 600 volt single or three-phase. For other voltages
consult factory. • Factory installed terminal block(s) • Cabinet
has baked enamel finish • Prewired element terminal leads •
Temperature and pressure relief valve • 2" dial temperature
gauge • Immersion type thermostat and high limit for faster
response.
OPTIONAL DUAL ENERGY SOURCE CAPABILITY —
Provides emergency back up energy source or winter/summer
boiler operation. Can be specified with optional water to water
or steam to water heat exchangers. Both single and double
wall heat exchangers are available. Complete control packages
can be factory installed for hook-up and run capability.
MEETS OR EXCEEDS THE
REQUIREMENTS OF ASHRAE
90.1b-1990 STANDARD FOR
ENERGY EFFICIENCIES.
ASME
MAGNETIC CONTACTOR(S) — Heavy duty UL rated for
100,000 cycles.
LOW WATER CUTOFF — Probe type electric low water cutoff
prevents energizing of elements in the event of low water
condition.
120 VOLT CONTROL CIRCUIT — 120 volt control circuit is
powered by fused transformer.
IMMERSION THERMOSTAT — Immersion temperature control
(one per 60KW) is adjustable to 180°F; high temperature cutoff
is manual reset, adjustable type.
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
repair or replace the 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.
Warranty does not apply to product installed outside of
the United States of America or its territorial possessions
and Canada.
July 2007R
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SAMPLE SPECIFICATIONS
The heater(s) shall be A.O. Smith Dura-Power Commercial Electric Model Number ___________________ or an approved
equal. Heater(s) shall be rated at _______ KW, _______ V, _______ phase, 60 cycle AC. The heater shall be for (vertical/
horizontal) installation with lifting lugs and channel skid base. Vessel shall be constructed to Section IV of the ASME Code for
125 psi working pressure. Vessel shall be glass-lined with anodic protection. Entire vessel and electrical controls are to be
encased in a rectangular sheet metal enclosure with baked enamel finish. Tank to be insulated with fiber glass insulation.
Separate 2" dial type temperature gauge will be mounted on the front of the enclosure. Enclosure to have hinged locking door
over electric controls. There shall be ____________ individually replaceable _______ KW, 4 bolt flange mounted, incoloy
sheathed heating elements each complete with prewired terminal leads. These elements will be switched by magnetic contactors
which are operated by a 120V fused control circuit protected by manual reset high limit. Control circuit is activated by a master
pilot switch and electronic low water cutoff. The thermostatic control of the contacts shall be in _______ stages through solid
state modulating step control which will balance the water heating input to the demand. This control shall prevent the entire
electrical load from being switched on instantaneously. The control shall have even load progressive sequencing which utilizes
the "first on, first off" principle thereby equalizing the operating time of heating elements and contactors. Each magnetic contactor
and heating element circuit will be protected by a maximum of 60 amp cartridge type fuses with a minimum of 100,000 amp
interrupting capacity. The entire water heating package shall be prewired to solderless terminal lugs, factory tested, complete
with ASME temperature and pressure relief valve and bear the Underwriters' Laboratories label. Heater(s) shall have a 3 year
limited warranty as outlined in the written warranty. Fully illustrated instruction manual included.
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OPTIONS
CONTROL OPTIONS
TANK LININGS
CEMENT – A special formulation of cement providing excel-
lent corrosion protection. Available on 200 gallon and larger
tanks.
EPOXY – A solventless two component epoxy lining applied
to a minimum ten-mil (.010") dry thickness. Available on
200 gallon and larger tanks.
GOLDENROD ELEMENTS – Available with Optional
Goldenrod Elements - All DVE/DHE models are available with
the Goldenrod 24K gold plated elements (patent pending).
Goldenrod Elements provide long-life and five times the
scaling resistance of standard incoloy elements. Goldenrod
Elements carry a three-year warranty against failure due to
scale.
SPECIAL CONSTRUCTION
SILICON BRONZE VESSELS – Are available for special
applications or very corrosive water conditions. Consult factory for specific sizes.
STAINLESS STEEL VESSELS – Are available for deionized
water. Built with stainless steel under rules of Section IV of
the ASME Boiler and Pressure Vessel Code for operation on
deionized water having a minimum specific resistivity of 10
megohm/cm.
150 OR 160 PSI WORKING PRESSURE – Must be specified at time of order.
OTHER OPTIONAL FEATURES
TEMPERATURE AND PRESSURE RELIEF VALVES – For
working pressures other than standard; consult factory.
HORIZONTAL OR VERTICAL – See specifications, most
gallon capacities may be obtained in vertical or horizontal
construction.
CIRCULATING PUMP PACKAGE – Circulating pump and
piping sized to turn over entire storage capacity of tank once
each hour. Recommended to optimize available water at
temperature in horizontal tanks particularly where low draw
conditions are anticipated.
OPTIONAL INTERNATIONAL VOLTAGES – 380 and 415
volts three phase.
COPPER TUBE TANK HEATER – Double wall copper tube
tank heaters are designed for heating potable water with both
potable or non-potable liquids or steam, and are specifically
engineered for installation in models DVE and DHE for dual
energy applications. Tank heaters have a positive fail-safe
means of leak detection in the event of either tube failure to
prevent mixture of heating medium and potable water. Single
wall heat exchangers are also available. Refer to pages A
412.3 and A 412.4 for more information.
THERMOSTATIC STEP CONTROL – The simplest form of
modulation. Allows elements to be stepped on in groups by
specifying additional thermostats (up to one per contactor).
It is recommended that number of thermostats not exceed
five.
SOLID STATE MODULATING STEP CONTROL – Solid state
electronic control device that modulates input to match load
through progressive sequencing of steps (up to 20 steps with
maximum of one per contactor).
SEQUENCER – Up to 5 stage time delay sequencer provides for stepping of elements in groups or individually (maximum of one step per contactor). Units supplied with this
option will have a 120/24 volt control circuit.
TERMINAL BLOCKS – Allows for remote connection to building demand limiter or other functions.
AUTOMATIC RESET HIGH LIMIT – A control that in the
event of high temperature, interrupts power, de-energizing
elements, automatic reset. (Standard with modulating step
control).
INDICATING LIGHTS – Denotes heating stage(s) in operation. Up to one light per contactor is available.
OVERRIDE SWITCHES – A simple means of load control
allows all or part of unit input to be controlled manually. Up
to one switch per contactor is available.
SAFETY DOOR INTERLOCK – Prevents opening of control
panel door when heater power supply is on. NOTE: Once
door is opened heater may be energized if necessary for
service diagnosis.
SHUNT TRIP CIRCUIT BREAKER – A safety device (circuit
breaker) which disconnects power to heater in the event of
overcurrent, high temperature or low water level, breaker must
be manually reset.
3-1/2" DIAL TYPE PRESSURE GAUGE – Factory installed.
3-1/2" DIAL TYPE TEMPERATURE GAUGE – Factory in-
stalled.
11" x 15" MANHOLE – Available as option on tanks 700
gallons or smaller.
A. O. Smith Water Products Company, Inc On Line
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www.hotwater.com
For Technical information and
Automated fax Service,
Phone: 800-527-1953
CIRCUIT BREAKER – A safety device which disconnects
power to the heater in the event of overcurrent.
A. O. Smith
Water Products Company
Irving, TX
A Division of A. O. Smith Corporation
A. O. Smith Corporation reserves the right to make product changes
or improvements at any time without notice.
Printed in U.S.A.© A. O. Smith Corp., 1999
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