Instruction Manual COMMERCIAL ELECTRIC WATER HEATERS MODELS DRE-52/80/120 SERIES 100 & DVE-52/80/120 SERIES 100 INSTALLATION - OPERATION - SERVICE - MAINTENANCE - LIMITED WARRANTY 500 Tennessee Waltz Parkway Ashland City, TN 37015 ASME (OPTIONAL) Thank you for buying this energy efficient water heater. 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 INFORMATION PRECAUTIONS HYDROGEN GAS (FLAMMABLE) DO NOT USE THIS APPLIANCE IF ANY PART HAS BEEN UNDER WATER. Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system which has been under water. If the unit is exposed to the following, do not operate heater until all corrective steps have been made by a qualified service agency. 1. External fire. 2. Damage. 3. Firing without water.
TABLE OF CONTENTS Thermostat Settings – Electronic Control Models.................... 21 ELECTRONIC CONTROL MODELS OPERATION.......................... 21 Control System Features.......................................................... 21 Control System Navigation....................................................... 21 Desktop Screen...................................................................21-23 Temperatures Menu.............................................................
dimensions and capacities data DRE/DVE MODEL DIFFERENCES This Instruction Manual covers two models of commercial electric water heaters; DRE models and DVE models. These two models are equipped from the factory with different controls. DRE models are factory equipped with surface mounted thermostat/ECO combination controls. DVE models are factory equipped with an electronic control system. In this Instruction Manual “DRE” models are referred to as: “Surface Mount Control” models.
APPROVALS All models meet National Sanitation Foundation NSF-5 requirements. All models are listed by Underwriters Laboratories Inc.
FEATURES AND COMPONENTS ELECTRONIC CONTROL MODELS FIGURE 1 7
FEATURES AND COMPONENTS SURFACE MOUNT CONTROL MODELS FIGURE 2 8
LOCATING THE NEW WATER HEATER Facts to Consider About the Location 2. Near a floor drain. The heater should be located in an area where leakage of the tank or connections will not result in damage to the area adjacent to the heater or to lower floors of the structure. 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 hot and cold water piping where heat loss and condensation may be a problem.
INSTALLATION REQUIRED ABILITY CONTAMINATED WATER Installation and service of this water heater requires ability equivalent to that of a qualified agency (page 2) in the field involved. Plumbing and electrical work is required. This water heater shall not be connected to any heating system(s) or component(s) used with a non-potable water heating appliance. general Toxic chemicals, such as those used for boiler treatment shall not be introduced into this system.
manufacturer. The valve is certified by a nationally recognized testing laboratory that maintains periodic inspection of production of listed equipment of materials as meeting the requirements for Relief Valves for Hot Water Supply Systems, ANSI Z21.22 • CSA 4.4, and the code requirements of ASME. If replaced, the new valve must meet the requirements of local codes, but not less than a combination temperature and pressure relief valve rated/sized and certified as indicated in the above paragraph.
electrical GENERAL The installation must conform with these instructions and the local code authority having jurisdiction and the requirements of the power company. In the absence of local codes, the installation must comply with the current editions of the National Electrical Code, NFPA 70 or the Canadian Electrical Code CSA C22.1. An electrical ground is required to reduce risk of electrical shock or possible electrocution.
AMPERAGE TABLE/OVERCURRENT PROTECTION limiting, a UIM (User Interface Module) for user interface & information display and element current sensors for monitoring the power circuits. Refer to the control circuit label on the water heater for details. The CCB is powered by a small 120V/24V transformer. The control circuit operates on 120V supplied by a larger 100VA transformer. Standard equipment includes control circuit fusing using two, 3 amp, class G fuses with 600 volt rating.
WIRING DIAGRAMS CCB (CENTRAL CONTROL BOARD) CIRCUIT BOARD CONTROL CIRCUIT DIAGRAM - ELECTRONIC CONTROL MODELS FIGURE 3.
WIRING DIAGRAMS POWER CIRCUIT DIAGRAMS - ELECTRONIC CONTROL MODELS The water heater’s electrical components are pictured and identified on page 7. The following describes the heater circuits and includes wiring diagrams. All heater circuits are designed for 60/50 hertz alternating current. The water heater circuit wiring is 12 AWG, AWM, or TEW type, rated 600 volts, 105°C. Fusing consists of three 30 amp fuses for each contactor. Fusing is an optional feature for Canadian models.
WIRING DIAGRAMS NINE ELEMENT - SINGLE AND THREE PHASE DIAGRAM 2. CONVERSION TO SINGLE PHASE CONVERSION TO THREE PHASE When the heater is shipped for connection to a three-phase electrical service, it may be connected to a single-phase electrical service of the same voltage by: When heater is shipped for connection to a single-phase electrical service, it may be connected to a three-phase electrical service of the same voltage by: 1. Disconnect blue wires and yellow wires from terminal L3. 1.
WIRING DIAGRAMS POWER CIRCUIT DIAGRAMS - SURFACE MOUNT CONTROL MODELS The water heater’s electrical components are pictured and identified on page 8. The following describes the heater circuits and includes wiring diagrams. All heater circuits are designed for 60/50 hertz alternating current. The water heater circuit wiring is 12 AWG, AWM, or TEW type, rated 600 volts, 105°C. Fusing consist of two 30 amp fuses for each element. Fusing is an optional feature for Canadian models. DIAGRAM 3.
WIRING DIAGRAMS NINE ELEMENTS - SINGLE AND THREE PHASE DIAGRAM 4. CONVERSION TO SINGLE PHASE CONVERSION TO THREE PHASE When the heater is shipped for connection to a three-phase electrical service, it may be connected to a single-phase electrical service of the same voltage by: When heater is shipped for connection to a single-phase electrical service, it may be connected to a three-phase electrical service of the same voltage by: 1. Disconnect blue wires from terminal L2. 1.
OPERATION GENERAL INITIAL START UP Refer to the Features and Components section of this manual (pages 7 & 8) for the location of components mentioned in the instructions that follow. The following checks should be made by the installer when the heater is placed into operation for the first time. 1. Turn off the electrical disconnect switch. 2. Open the front panel, check all water and electrical connections for tightness. Also check connections on top and side of heater.
TEMPERATURE REGULATION Setting the water heater temperatures at 120°f will reduce the risk of scalds. Some States require settings at specific lower temperatures. HIGH TEMPERATURE LIMIT CONTROLS (ECO) Both the ELECTRONIC CONTROL and SURFACE MOUNT CONTROL model water heaters are equipped with one or more ECO (energy cut off) non adjustable high temperature limit control(s). An ECO is a normally closed switch that opens (activates) on a rise in temperature.
The Operating Set Point is adjustable from 90°F/42°C to 190°F/88°C. The factory setting is 120°F/49°C. See the Electronic Control Models Operation section of this manual for instructions on how to adjust the Operating Set Point and other user settings. THERMOSTAT SETTINGS - electronic CONTROLs These models are equipped with an electronic control system. The control system senses temperature from a factory installed Immersion Temperature Probe (see Figure 1).
Menu: The left Operational Button is pressed to enter the Main Menu where all control system menus are accessed. See Table 3 for a list of control system menus. are adjusted in the Economy Mode Setup menu. The current Operating Mode, either Normal Mode or Economy Mode, is displayed beneath the day and time.
TABLE 2 OPERATING STATES. STATE DESCRIPTION Standby The water heater is not in an active heating cycle. This usually indicates the temperature in the tank has reached the Operating Set Point and the control system has terminated the heating cycle. Heating The control system is in the Heating Mode. At least one bank of heating elements has been energized. Alert The control system has detected/declared an Alert Condition. The controls system will continue heating operation.
Differential Settings Tank Temperature Adjustable user setting(s) 1°F to 20° range; factory default is 2°F. The water heaters covered in this Instruction Manual will have 3, 6 or 9 heating elements. Each group of 3 heating elements is one “Bank” of heating elements. Heating elements are energized in Banks of 3. Each Bank of heating elements will have a Differential Setting associated with it. Differential Settings are located in the Temperatures Menu. Non adjustable information display.
HEATER STATUS MENU Alarm Condition This menu displays non adjustable operational information. This menu contains more information that can be displayed on one screen of the LCD display. Use the Up & Down Buttons to navigate to the bottom of this menu. Displays the status of the user definable Alarm Output function - see Alarm Output Setup Menu. Yes = alarm condition has been met, No = alarm condition has not been met.
Normal Operation Between: When this operating mode is active there will also be start and stop times to program. The normal Operating Set Point is used between the programmed start and stop times and the Economy Set Point will be in effect during the rest of the day. There is one start time and one stop time event per day. “Normal Operation All Day” - “Economy Mode All Day” and “Normal Operation Between.” Only one Operating Mode can be active, the factory default is Normal Operation All Day.
Economy Mode Settings Time Clock Settings ACTION DISPLAY From the Desktop Screen navigate to the Economy Mode Setup menu. Use the Up/Down buttons to select (highlight in black) Current Time sub menu. Press the Operational Button underneath “CHANGE” to enter the Current Time sub menu. Use the Up/Down buttons to select the “Weekday” setting. Press the Operational Button underneath “CHANGE” to activate the adjustment mode for this setting.
Economy Mode Settings Daily Operating Mode Settings ACTION DISPLAY Economy Mode All Day: From the Economy Mode Setup menu use the Up/Down buttons to select (highlight in black) the Daily sub menu for “Sun.” Press the Operational Button underneath “CHANGE” to enter this menu. Use the Up/Down buttons to select (highlight in black) the “Economy Mode All Day” setting.
ALARM OUTPUT SETUP MENU DISPLAY SETTINGS MENU Permits user to set the condition (from a list of options) for when the CCB’s integral alarm output relay will be energized. Alarm relay connections (common, normally open, normally closed) are located on the J3 terminal strip on the CCB. Alarm output relay contacts are capable of switching 1 amp maximum at 120 VAC. Permits user to set display options for viewing information on the UIM’s LCD screen.
Elapsed Time This menu displays non adjustable operational information. The control system records and stores the last 9 Fault and Alert messages in chronological order in this menu. The most recent will be at the top of the list. A time stamp is displayed below each listed Fault and Alert message showing when the Fault or Alert condition occurred. Total accumulated time the control system (water heater) has been energized.
Restore Factory Defaults ACTION DISPLAY From the Main Menu use the Up/Down buttons to select (highlight in black) the “Restore Factory Defaults” menu. Press the Operational Button underneath “SELECT.” The Restore Factory Defaults menu will be displayed. From the Restore Factory Defaults menu press the Operational Button underneath “YES.” The display will show text confirming the factory default settings have been restored.
3. Characteristics of water supply. its diameter is 3/8” (1 cm) of an inch, or annually which ever is first. Aggressive, very hot and softened water causes rapid consumption of the anode requiring frequent inspections. Call the toll free number on the back cover of this manual for information on obtaining replacement anode rods. Regardless of water treatment, the elements should be examined regularly. Lime scale accumulations may cause noises to occur during operation.
TROUBLESHOOTING CHECKLIST CHECKLIST ABNORMAL SOUNDS Before calling for service, check the following points to see if the cause of trouble can be identified and corrected. 1. Sediment or lime scale accumulations on the elements causes sizzling and hissing noises when the heater is operating. Reviewing this checklist may eliminate the need of a service call and quickly restore hot water service. See Figures 1 and 2 in this manual to identify and locate water heater components.
Leakage Checkpoints INSTRUCTIONS: USE THIS ILLUSTRATION AS A GUIDE WHEN CHECKING FOR SOURCES OF WATER LEAKAGE. Where possible, remove or lift top cover to examine threads of fittings installed into tank for evidence of leakage. Correct fitting leaks as necessary. Relief valve operation and leakage may be due to water expansion during heating cycle or foreign material on seat of valve. If the valve is not piped to an open drain, the released water could be mistaken for a leaking heater.
PIPING DIAGRAMS ONE TEMPERATURE WITH CIRCULATING LOOP INSERT B VACUUM RELIEF VALVE. INSTALL PER LOCAL CODES. *PIPE TO OPEN DRAIN INSTALL IN ACCORDANCE WITH ALL LOCAL CODES.
PIPING DIAGRAMS INSERT B VACUUM RELIEF VALVE. INSTALL PER LOCAL CODES.
PIPING DIAGRAMS INSERT B VACUUM RELIEF VALVE. INSTALL PER LOCAL CODES.
PIPING DIAGRAMS ONE TEMPERATURE ONE HEATER VERTICAL STORAGE TANK FORCED CIRCULATION WITHOUT BUILDING RECIRCULATION *PIPE TO OPEN DRAIN INSTALL IN ACCORDANCE WITH ALL LOCAL CODES TWO TEMPERATURE WITH MIXING VALVE AND CIRCULATING LOOP INSERT B VACUUM RELIEF VALVE. INSTALL PER LOCAL CODES.
PIPING DIAGRAMS INSERT B VACUUM RELIEF VALVE. INSTALL PER LOCAL CODES.
PIPING DIAGRAMS THREE HEATERS WITH VERTICAL STORAGE TANK WITH OR WITHOUT BUILDING RECIRCULATION INSERT B VACUUM RELIEF VALVE. INSTALL PER LOCAL CODES.
PIPING DIAGRAMS FOUR HEATERS WITH VERTICAL STORAGE TANK WITH OR WITHOUT BUILDING RECIRCULATION INSERT B VACUUM RELIEF VALVE. INSTALL PER LOCAL CODES.
PIPING DIAGRAMS MANIFOLD KITS ALL DIMENSIONS IN INCHES MANIFOLD KITS TWO HEATERS Tank Capacity (gallons) Part Number H W D A 52 9003429205 66 1/4 56 3/4 27 1/4 13 1/4 80 9003429205 70 1/2 60 1/4 31 1/4 9 3/4 120 9003429205 73 1/4 64 1/2 35 3/4 5 1/2 Inlet and outlet size - 1 1/2 THREE HEATERS Tank Capacity (gallons) Part Number H W D A 52 9003430205 66 1/4 91 3/4 27 1/4 13 1/4 80 9003430205 70 1/2 95 1/4 31 1/4 9 3/4 120 9003430205 73 1/4 99 1/2 35 3/4 5 1/2
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.
500 Tennessee Waltz Parkway, Ashland City, TN 37015 Technical Support: 800-527-1953 • Parts: 800-433-2545 • Fax: 800-644-9306 www.hotwater.
