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  4. DURA-Power DRE-52
  5. Instruction Manual

A.O. Smith DURA-Power DRE-52 Instruction Manual

Manual is about: commercial electric Water Heaters 100 SERIES

Summary of DURA-Power DRE-52

  • Page 1

    1 instruction manual printed in the u.S.A 0908 196674-002 place these instructions adjacent to heater and notify owner to keep for future reference. Commercial electric water heaters thank you for buying this energy efficient water heater. We appreciate your confidence in our products. Models dre-52...

  • Page 2

    2 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...

  • Page 3: General Safety Information

    3 general safety information when servicing this unit, verify the power to the unit is turned off prior to opening the control cabinet door. Precautions 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...

  • Page 4: Introduction

    4 thank you for purchasing this water heater. Properly installed and maintained, it should give you years of trouble free service. Abbreviations found in this instruction manual: • ansi - american national standards institute • asme - american society of mechanical engineers • gama - gas appliance m...

  • Page 5

    5 dimensions and capacities data model number tank capacity in gallons (liters) a - inches (mm) b - inches (mm) c - inches (mm) inlet/outlet dre/dve-52 50 (189.3) 55 3/4 (1416) 21 3/4 (552) 27 (685) 1 1/4 dre/dve-80 80 (302.8) 60 1/4 (1350) 25 1/2 (648) 31 (787) 1 1/4 dre/dve-120 119 (450.5) 62 1/4 ...

  • Page 6: Approvals

    6 approvals model and rating all models meet national sanitation foundation nsf-5 requirements. All models are listed by underwriters laboratories inc..

  • Page 7: Features And Components

    7 features and components electronic control models figure 1.

  • Page 8: Features And Components

    8 features and components surface mount control models figure 2.

  • Page 9

    9 facts to consider about the location carefully choose a location for the new water heater. The placement is a very important consideration for the safety of the occupants in the building and for the most economical use of the appliance. Whether replacing an old water heater or putting the water he...

  • Page 10: Installation

    10 installation required ability 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. General the installation must conform with these instructions and the local code authorit...

  • Page 11

    11 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...

  • Page 12: Electrical

    12 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 th...

  • Page 13

    13 amperage table/overcurrent protection the tables above provides the total connected heating element load in amperes for branch circuit conductor and overcurrent protection sizing. Single-phase heaters are two wire circuits. Three-phase heaters are three wire circuits. In addition to the foregoing...

  • Page 14: Wiring Diagrams

    14 ccb (central control board) circuit board control circuit diagram - electronic control models figure 3. Wiring diagrams.

  • Page 15: Wiring Diagrams

    15 diagram 1. 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 curr...

  • Page 16: Wiring Diagrams

    16 wiring diagrams nine element - single and three phase conversion to single 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: 1. Disconnect blue wires and yellow wires from terminal ...

  • Page 17: Wiring Diagrams

    17 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...

  • Page 18: Wiring Diagrams

    18 wiring diagrams conversion to single 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: 1. Disconnect blue wires from terminal l2. 2. Connect all blue wires to terminal l1 (with blac...

  • Page 19: Operation

    19 operation general refer to the features and components section of this manual (pages 7 & 8) for the location of components mentioned in the instructions that follow. Never turn on power to the water heater without being certain the water heater is filled with water and a temperature and pressure ...

  • Page 20: Temperature Regulation

    20 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. ...

  • Page 21

    21 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). The “operating set point” is adjusted to control water temperature. This is an adjustab...

  • Page 22

    22 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. Help:the right operational button is pressed to access instructions and explanations for user settings, operating states, status icons, ...

  • Page 23

    23 temperatures menu operating set point user adjustable setting 90°f to 190°f range; factory default is 120°f. When the water temperature sensed by the control system from the immersion temperature probe reaches the operating set point the control system will end the heating cycle. A call for heat ...

  • Page 24

    24 differential settings 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. E...

  • Page 25

    25 heater status menu 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. Top of menu bottom of menu status displays the current operat...

  • Page 26

    26 “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. Normaloperationallday:when this operating mode is active the normal operating set point is used for the entire day. Economymo...

  • Page 27

    27 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/d...

  • Page 28

    28 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 butto...

  • Page 29

    29 alarm output setup 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 ca...

  • Page 30

    30 elapsed time total accumulated time the control system (water heater) has been energized. Total heating time total accumulated time the control system has been in the heating mode. Ie: any heating elements have been energized. Bank # cycles total accumulated count of heating cycles for each bank ...

  • Page 31: Maintenance

    31 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 pres...

  • Page 32

    32 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. Ma...

  • Page 33: Troubleshooting Checklist

    33 troubleshooting checklist 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. See figures 1 and 2 in this manual to...

  • Page 34

    34 leakage checkpoints instructions: use this illustration as a guide when checking for sources of water leakage. All water which appears at the heater bottom or on the surrounding floor may be caused by condensation, loose connections or relief valve operation and leakage. Do not replace the heater...

  • Page 35: Piping Diagrams

    35 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..

  • Page 36: Piping Diagrams

    36 piping diagrams insert b vacuum relief valve. Install per local codes..

  • Page 37: Piping Diagrams

    37 piping diagrams insert b vacuum relief valve. Install per local codes..

  • Page 38: Piping Diagrams

    38 piping diagrams insert b vacuum relief valve. Install per local codes. One temperature one heater vertical storage tank forced circulation without building recirculation two temperature with mixing valve and circulating loop two temperature with mixing valve *pipe to open drain install in accorda...

  • Page 39: Piping Diagrams

    39 piping diagrams two heaters with horizontal storage tank with or without building recirculation insert b vacuum relief valve. Install per local codes..

  • Page 40: Piping Diagrams

    40 piping diagrams three heaters with horizontal storage tank with or without building recirculation three heaters with vertical storage tank with or without building recirculation insert b vacuum relief valve. Install per local codes..

  • Page 41: Piping Diagrams

    41 piping diagrams four heaters with vertical storage tank with or without building recirculation four heaters with horizontal storage tank with or without building recirculation insert b vacuum relief valve. Install per local codes..

  • Page 42: Piping Diagrams

    42 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 tan...

  • Page 43: Warranty

    43 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, dur...

  • Page 44

    44 500 tennessee waltz parkway, ashland city, tn 37015 technical support: 800-527-1953 • parts: 800-433-2545 • fax: 800-644-9306 www.Hotwater.Com.