Instruction Manual COMMERCIAL ELECTRIC WATER HEATERS MODELS DVE-150 THRU DVE-10000 DHE-200 THRU DHE 10000 INSTALLATION - OPERATION - SERVICE MAINTENANCE - LIMITED WARRANTY A DIVISION OF A.O. SMITH CORPORATION RENTON, WASHINGTON ASME 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.
SAFE INSTALLATION, USE, AND SERVICE 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.
GENERAL SAFETY When servicing this unit, verify the power to the unit is turned off prior to opening the control cabinet door.
TABLE OF CONTENTS WIRING DIAGRAMS......................................................... 12-13 OPERATION............................................................................14 General............................................................................14 Filling the Water Heater...................................................14 Start Up............................................................................14 Draining the Water Heater...............................................
dimensions and capacities data 5
FEATURES AND COMPONENTS NOTE: Your actual configuration may vary. DVE Vertical Water Heater (typical).
FEATURES AND COMPONENTS NOTE: Your actual configuration may vary. DHE Horizontal Water Heater (typical).
LOCATING THE NEW WATER HEATER Facts to Consider About the Location The pan should be at least 2 inches deep, have a minimum 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.
refrigerants, swimming pool chemicals, water softener chemicals, calcium and sodium chloride, waxes, and process chemicals are typical compounds which are potentially corrosive. These materials are corrosive at very low concentration levels with little or no odor to reveal their presence. If replaced, the valve must meet the requirements of local codes, but not less than a combination temperature and pressure relief valve certified as indicated in the above paragraph. Contact the A.O.
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.
electrical and recoveries data TABLE 2.
WIRING DIAGRAMS TURN OFF THE HEATER ELECTRICAL SUPPLY BEFORE SERVICING ANY ELECTRICAL COMPONENTS. 300-600 VOLTS STANDARD THERMOSTAT CONTROL WIRING (WYE).
WIRING DIAGRAMS TURN OFF THE HEATER ELECTRICAL SUPPLY BEFORE SERVICING ANY ELECTRICAL COMPONENTS.
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 is now ready for start up and temperature regulation. 7. Close the cabinet door and perform start up checks listed below before turning on the electricity. Refer to the Features and Components section of this manual (pages 6 & 7) for the location of components mentioned in the instructions that follow.
instructions for installation of the valves. Before changing the factory setting on the thermostat, read the entire “Temperature Regulation” section in this manual. Without the circulating pump, horizontal model heaters should be set not higher than 165°F. Vertical models may be set as desired, not to exceed 185°F. It is recommended that lower water temperatures be used to avoid the risk of scalding.
Temperature-Pressure Relief Valve Operation WATER AND LIME SCALE REMOVAL 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 water supply.
TROUBLESHOOTING CHECKLIST Before calling for service, check the following points to see if the cause of trouble can be identified and corrected. Reviewing this checklist may eliminate the need of a service call and quickly restore hot water service. 7. Sediment or lime scale may be affecting water heater operation. Refer to the MAINTENANCE section of this manual for details.
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.
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