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Instruction Manual
coMMercIal electrIc water heaters
Models dVe-150 thru dVe-10000
dhe-200 thru dhe 10000
InstallatIon - operatIon - ser VIce -
MaIntenance - lIMIted warranty
a dIVIsIon of a.o. sMIth corporatIon
renton, washInGton
asM e
Thank you for buying this energy efficient water
heater from A.O. Smith Water Products Company. We
appreciate your confidence in our products.
place these InstructIons adjacent to heater and notIfy owner to keep for future reference.
PRINTED IN THE U.S.A 120
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safe InstallatIon, use, and ser VIce the proper installation, use and servicing of this water heater is extremely important to your safety and the safety of others. Many safety-related messages and instructions have been provided in this manual and on your own water heater to warn you and others of a potential injury hazard. read and obey all safety messages and instructions throughout this manual. It is very important that the meaning of each safety message is understood by you and others w
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General safety when servicing this unit, verify the power to the unit is turned off prior to opening the control cabinet door. 3
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taBle of contents SAFE INSTALLATION, USE AND SERVICE............................2 WIRING DIAGRAMS ........................................................ 12-13 GENERAL SAFETY..................................................................3 OPERATION ...........................................................................14 General ...........................................................................14 TABLE OF CONTENTS ............................................................4 F
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dIMensIons and capacItIes data 5
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features and coMponents NOTE: Your actual configuration may vary. dVe Vertical Water Heater (typical). 6
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features and coMponents NOTE: Your actual configuration may vary. dhe horizontal Water Heater (typical). 7
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locatInG the new water heater The pan should be at least 2 inches deep, have a minimum f acts to consIder aBout the locatIon length and width of at least 2 inches greater than the dimensions of the water heater and should be piped to an adequate drain. The discharge opening of the relief valve should always be piped to an open drain. 3. Close to the point of major hot water usage and the power supply. Hot water piping and branch circuit wiring should be as short as possible. Insulate ho
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refrigerants, swimming pool chemicals, water softener chemicals, If replaced, the valve must meet the requirements of local codes, calcium and sodium chloride, waxes, and process chemicals are but not less than a combination temperature and pressure relief typical compounds which are potentially corrosive. These materials valve certified as indicated in the above paragraph. Contact the are corrosive at very low concentration levels with little or no odor to A.O. Smith Customer Care Center fo
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electrIcal General Check the water heater model and rating plate information against the characteristics of the branch circuit electrical supply. Do not connect the heater to an improper source of electricity. Voltage applied to the heater should not vary more than +5% to -10% of the model and rating plate marking for satisfactory operation. Do not energize the branch circuit for any reason before the water heater tank is filled with water. Doing so may cause the heating elements to fail.
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electrIcal and recoVerIes data taBle 2. 11
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wIrInG dIaGraMs TURN OFF THE HEATER ELECTRICAL SUPPLY BEFORE SERVICING ANY ELECTRICAL COMPONENTS. 300-600 VOLTS STANDARD THERMOSTAT CONTROL WIRING (WYE). 12
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wIrInG dIaGraMs TURN OFF THE HEATER ELECTRICAL SUPPLY BEFORE SERVICING ANY ELECTRICAL COMPONENTS. 208-240 VOLTS, STANDARD THERMOSTAT CONTROL WIRING (DELTA) 13
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operatIon General 6. Close the hot water faucet when water starts to flow from the faucet. Leave the cold water inlet valve fully open. The heater Refer to the Features and Components section of this manual is now ready for start up and temperature regulation. (pages 6 & 7) for the location of components mentioned in the 7. Close the cabinet door and perform start up checks listed below instructions that follow. before turning on the electricity. neVer operate the heating elements without b
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instructions for installation of the valves. Before changing the factory wIthout the circulating pump, horizontal model heaters should be setting on the thermostat, read the entire “Temperature Regulation” set not higher than 165°F. Vertical models may be set as desired, not to exceed 185°F. section in this manual. It is recommended that lower water temperatures be used to avoid Where MultIple therMostats are used on a vertical model the risk of scalding. It is further recommended, in all ca
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water and lIMe scale reMoV al teMperature-pressure relIef Val Ve operatIon Water and lime scale accumulations on the heating elements is a normal condition, common to all immersion type elements. Factors which affect the amount of this formation are: 1. Amount of hot water used. As the volume of water heated increases, more scale results. 2. Water temperature. As the temperature of the water is increased, more scale is deposited on the elements. 3. Mineral level characteristics of the wate
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trouBleshootInG checklIst Before calling for service, check the following points to see if the 7. Sediment or lime scale may be affecting water heater operation. cause of trouble can be identified and corrected. Reviewing this Refer to the MAINTENANCE section of this manual for details. checklist may eliminate the need of a service call and quickly restore hot water service. water Is too hot The illustration in the Features and Components section of this Refer to the TEMPERATURE REGULATION se
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warranty A. O. Smith Corporation, the warrantor, extends the following LIMITED WARRANTY to the owner of this water heater: 1. THE TANK If the glass-lined tank in this water heater shall prove upon examination by the warrantor to have leaked due to natural corrosion from potable water therein, during the first THREE years after initial installation, the warrantor will supply a complete new A. O. Smith water heater of equivalent size and current model. Some government agencies are requiring ene
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notes 19
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www.aosmithwaterheaters.com 20
