Instruction Manual COMMERCIAL ELECTRIC WATER HEATERS MODELS DSE-5 THRU DSE-120 INSTALLATION - OPERATION - SERVICE MAINTENANCE - LIMITED WARRANTY A DIVISION OF A. O. SMITH CORPORATION RENTON, WASHINGTON www.hotwater.com 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.
SAFE INSTALLATION, USE AND SERVICE Your safety and the safety of others is extremely important in the installation, use, and servicing of this water heater. 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 WATER HEATER IF ANY PART HAS BEEN EXPOSED TO FLOODING OR WATER DAMAGE. Immediately call a qualified service technician to inspect the water heater 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 technician. 1. External fire. 2. Damage. 3. Firing without water.
TABLE OF CONTENTS SAFE INSTALLATION, USE AND SERVICE...........................................................2 GENERAL SAFETY INFORMATION........................................................................3 Precautions.....................................................................................................3 Hydrogen Gas (Flammable)............................................................................3 INTRODUCTION.......................................................................
DIMENSIONS AND CAPACITIES DATA Figure 1. Table 1. DSE Tank Capacity Gallons Liters Maximum KW Input 5 19 3 All Dimensions in Inches (mm) A B 20 1/2 521 mm Approximate Shipping Wt. C 16 1/4 412.75 mm 22 1/2 D 571.5 mm 5 1/4 133.35 mm Lbs. Kg. 82 37.2 48.1 10 38 6 26 1/4 667 mm 18 3/4 476.25 mm 25 635 mm 5 1/4 133.35 mm 106 20 76 18 27 1/4 692 mm 20 1/2 520.7 mm 26 1/2 673.1 mm 5 3/4 146.05 mm 130 59 30 114 24 35 3/4 908 mm 20 1/2 520.7 mm 26 1/2 673.
FEATURES AND COMPONENTS Below is an illustration of the water heater with its features called out. The text of this manual will refer to the items shown. UIM - USER INTERFACE MODULE (on front of hinged access door) Figure 2.
APPROVALS All models meet National Sanitation Foundation NSF-5 requirements. All models are listed by Underwriters Laboratories Inc. MODEL AND RATING 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.
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 authority having jurisdiction and the requirements of the power company. In the absence of code requirements, follow NFPA-70 (current edition).
For safe operation of the water heater, the temperature and pressure relief valve must not be removed from its designated opening nor plugged. The temperature-pressure relief valve must be installed directly into the fitting of the water heater designed for the relief valve. Install discharge piping so that any discharge will exit only within 6 inches (15.2 cm) above, or at any distance below the structural floor. Be certain that no contact is made with any live electrical part.
ELECTRICAL DATA General Control Circuits 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. The water heater is equipped with an electronic control system.
Table 3. Allowable Ampacities of Insulated Conductors Not More Than Three Conductors in Raceway or Cable or Earth (Directly Buried), Based on Ambient Temperature of 30°C (86°F) Size 60°C (140°F) 75°C (167°F) TYPES FEPW RH, RHW RUH, THW, THWN, XHHW USE, ZW COPPER ...... ...... 15 20 30 45 65 85 100 115 130 150 175 200 230 255 285 310 335 380 TYPES RUW, T TW, UF AWG MCM ...... ......
WIRING DIAGRAMS DIAGRAM 1. SMALL COMMERCIAL WIRE DIAGRAM 208-240V / 3PH DIAGRAM 2.
3-1 PHASE CONVERSIONS In the case where the unit is phase convertible and it has only one contactor, jumper wires (provided) must be added according to the phase of the supply voltage. See the diagram below. For single-phase connection, jumpers A-C and B-D must be added. For threephase connection, jumper B-C must be added. 3-1 PHASE CONTACTOR JUMPER CONFIGURATION 1 PHASE CONNECTION 3 PHASE CONNECTION DIAGRAM 3.
DIAGRAM 4. SMALL COMMERCIAL WIRE DIAGRAM 300-600V / 3PH DIAGRAM 5.
OPERATION General 7. Refer to the Features and Components section of this manual for the location of components mentioned in the instructions that follow. Initial Start Up NEVER operate the heating elements without being certain the water heater is filled with water, and a temperature and pressure relief valve is installed in the relief valve opening on top of the heater. Close the cabinet door and perform start up checks listed below before turning on the electricity.
TEMPERATURE REGULATION High Temperature Limit Controls (ECO) Temperature Adjustment This water heater is equipped with an ECO (energy cut out) non adjustable high temperature limit control. An ECO is a normally closed switch that opens (activates) on a rise in temperature. If the ECO switch contacts open (activate) due to abnormally high water temperatures the control system will lock-out and disable further heating element operation.
CONTROL SYSTEM OPERATION Heating Element Operation Control System Features Advanced Diagnostics Plain English text and animated icons display detailed operational and diagnostic information. LCD screen on the front of the water heater displays the Sequence of Operation in real time. Fault or Alert messages are displayed when operational problems occur. Advanced Service menu displays a list of possible causes for current Fault and Alert conditions to aid in servicing. Economy Mode Operation Figure 4.
Help: The right Operational Button is pressed to access instructions and explanations for user settings, Operating States, Status Icons, manufacturer’s web address, technical support phone number and service agent contact information. Status: The Operating State of the control system is displayed beneath the Operating Set Point. Day/Time/Operating Mode: The current time and day are also displayed on the Desktop Screen. “Clock Not Set” will be displayed until the time clock has been initially set.
Table 6. - 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 heating element has been energized. Alert The control system has detected/declared an Alert Condition. The controls system will continue heating operation.
Temperatures Menu Operating Sequence Operating Set Point On a water heater equipped with 3 heating elements, with an Operating Set Point of 120°F and all Differential settings at 2°F the On/Off sequencing of heating elements would be as follows: 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.
Temperature Settings The Operating Set Point and the Differential Settings are adjusted in the Temperatures Menu. The following instructions explain how to adjust these user settings and navigate the control system menus. ACTION DISPLAY From the Desktop Screen, press the Operational Button underneath “MENU” to enter the Main Menu. Notice how the text above the Operational Buttons on the display changes as you navigate through the various menus and screens.
Heater Status Menu Element # On This menu displays non adjustable operational information. Use the Up & Down Buttons to navigate to the bottom of this menu. Displays the on/off status of each heating element. Yes = On, No = Off. Tank Full Top of Menu Displays the status of the optional LWCO (Low Water Cut Off) device. Yes = water level is acceptable, No = water level is low. Alarm Condition Displays the status of the user definable Alarm Output function - see Alarm Output Setup Menu.
Daily Operating Mode (Sun - Mon - Tue - Wed - Thu - Fri - Sat) The Economy Set Point is the water temperature the control system maintains during programmed Economy Mode time periods. “Economy Set Point” is displayed instead of “Operating Set Point” and “Economy Mode” appears beneath the current time on the Desktop Screen during Economy Mode time periods. Seven daily sub menus are listed at the bottom of the Economy Mode Setup menu.
Economy Mode Settings Setpoint Adjustment Value ACTION DISPLAY From the Desktop screen, press the Operational Button underneath “MENU” to enter the Main Menu. Notice how the text above the Operational Buttons on the display changes as you navigate through the various menus and screens. Use the Up/Down buttons to select (highlight in black) the Economy Mode Setup menu from the Main Menu. Press the Operational Button underneath “SELECT” to enter the Economy Mode Setup menu.
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 Alarm Output Settings 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 - see wiring diagrams. Alarm output relay contacts are capable of switching 1 amp maximum at 120 VAC. Changing the user settings in this menu is done using the same methods for changing the Operating Set Point.
Bottom of Menu 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. The Fault History is useful when dealing with intermittent operational problems or when the customer has reset the control system prior to a service agent’s arrival.
Restore Factory Defaults Menu This control system menu allows the user to restore most of the control system’s user settings to their factory default settings. User settings in the Alarm Output Setup and Display Settings menus are unaffected by executing Restore Factory Defaults. 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.
MAINTENANCE General If after manually operating the valve, it fails to completely reset and continues to release water, immediately close the cold water inlet to the water heater, follow the draining instructions in the Start Up section of this manual, and replace the temperature-pressure relief valve with a properly rated/sized new one.
3. and allow scale to dissolve. Do not permit delimer or water to contact heating element electrical terminals. Characteristics of water supply. Regardless of water treatment, the elements should be examined regularly. • Lime scale accumulations may cause noises to occur during operation. Silicates, sulfates, and aluminates must be removed by scraping or other mechanical means. Lime scale dissolvents will not remove these types of scale which are occasionally encountered.
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. Water Is Too Hot The illustration in the Features and Components section of this manual identifies the location of most of the heater components. Water Heater Makes Strange Sounds Refer to the TEMPERATURE REGULATION section of this manual. 1.
PIPE T&P TO OPEN DRAIN FUSED DISCONNECT SWITCH NOTES: 1. Preferred piping diagram. 2. The temperature and pressure relief valve setting shall not exceed pressure rating of any component in the system. 3. Service valves are shown for servicing unit. However, local codes shall govern their usage. FINISHED FLOOR HOT WATER TO FIXTURES WARNING: THIS DRAWING SHOWS SUGGESTED PIPING CONFIGURATION AND OTHER DEVICES; CHECK WITH LOCAL CODES AND ORDINANCES FOR ADDITIONAL REQUIREMENTS.
HOT WATER TO FIXTURES ALT. COLD WATER CONNECTION NOTES: 1. Preferred piping diagram. 2. The temperature and pressure relief valve setting shall not exceed pressure rating of any component in the system. 3. Service valves are shown for servicing unit. However, local codes shall govern their usage. 4. The Tank Temperature Control should be wired to and control the pump between the water heater(s) and the storage tank(s). 5.
HOT WATER TO FIXTURES ALTERNATE LOCATION NOTES: 1. Preferred piping diagram. 2. The temperature and pressure relief valve setting shall not exceed pressure rating of any component in the system. 3. Service valves are shown for servicing unit. However, local codes shall govern their usage. 4. The Tank Temperature Control should be wired to and control the pump between the water heater(s) and the storage tank(s). 5.
PIPE T&P TO OPEN DRAIN FUSED DISCONNECT SWITCH PIPE T&P TO OPEN DRAIN FUSED DISCONNECT SWITCH NOTES: 1. Preferred piping diagram. 2. The temperature and pressure relief valve setting shall not exceed pressure rating of any component in the system. 3. Service valves are shown for servicing unit. However, local codes shall govern their usage.
PIPE T&P TO OPEN DRAIN PIPE T&P TO OPEN DRAIN HOT WATER TO FIXTURES DRAIN EXPANSION TANK WATER FLOW SWITCH TEMPERATURE GAGE CHECK VALVE FULL PORT BALL VALVE HOT WATER RETURN COLD WATER SUPPLY TANK TEMPERATURE CONTROL CIRCULATING PUMP PRESSURE RELIEF VALVE TEMPERATURE & PRESSURE RELIEF VALVE ALT. COLD WATER CONNECTION NOTES: 1. Preferred piping diagram. 2. The temperature and pressure relief valve setting shall not exceed pressure rating of any component in the system. 3.
PIPE T&P TO OPEN DRAIN PIPE T&P TO OPEN DRAIN DRAIN TANK TEMPERATURE CONTROL CIRCULATING PUMP PRESSURE RELIEF VALVE TEMPERATURE & PRESSURE RELIEF VALVE ALTERNATE LOCATION HOT WATER TO FIXTURES NOTES: 1. Preferred piping diagram. 2. The temperature and pressure relief valve setting shall not exceed pressure rating of any component in the system. 3. Service valves are shown for servicing unit. However, local codes shall govern their usage. 4.
PIPE T&P TO OPEN DRAIN FUSED DISCONNECT SWITCH PIPE T&P TO OPEN DRAIN FUSED DISCONNECT SWITCH PIPE T&P TO OPEN DRAIN FUSED DISCONNECT SWITCH NOTES: 1. Preferred piping diagram. 2. The temperature and pressure relief valve setting shall not exceed pressure rating of any component in the system. 3. Service valves are shown for servicing unit. However, local codes shall govern their usage.
PIPE T&P TO OPEN DRAIN PIPE T&P TO OPEN DRAIN PIPE T&P TO OPEN DRAIN FUSED DISCONNECT SWITCH DRAIN ALT. COLD WATER CONNECTION HOT WATER RETURN WATER FLOW SWITCH TEMPERATURE GAGE CHECK VALVE FULL PORT BALL VALVE COLD WATER SUPPLY EXPANSION TANK TANK TEMPERATURE CONTROL CIRCULATING PUMP PRESSURE RELIEF VALVE TEMPERATURE & PRESSURE RELIEF VALVE HOT WATER TO FIXTURES NOTES: 1. Preferred piping diagram. 2.
PIPE T&P TO OPEN DRAIN PIPE T&P TO OPEN DRAIN PIPE T&P TO OPEN DRAIN FUSED DISCONNECT SWITCH NOTES: 1. Preferred piping diagram. 2. The temperature and pressure relief valve setting shall not exceed pressure rating of any component in the system. 3. Service valves are shown for servicing unit. However, local codes shall govern their usage. 4. The Tank Temperature Control should be wired to and control the pump between the water heater(s) and the storage tank(s). 5.
PIPE T&P TO OPEN DRAIN PIPE T&P TO OPEN DRAIN PIPE T&P TO OPEN DRAIN FUSED DISCONNECT SWITCH NOTES: 1. Preferred piping diagram. 2. The temperature and pressure relief valve setting shall not exceed pressure rating of any component in the system. 3. Service valves are shown for servicing unit. However, local codes shall govern their usage.
PIPE T&P TO OPEN DRAIN PIPE T&P TO OPEN DRAIN FUSED DISCONNECT SWITCH PIPE T&P TO OPEN DRAIN FUSED DISCONNECT SWITCH PIPE T&P TO OPEN DRAIN NOTES: 1. Preferred piping diagram. 2. The temperature and pressure relief valve setting shall not exceed pressure rating of any component in the system. 3. Service valves are shown for servicing unit. However, local codes shall govern their usage. 4.
PIPE T&P TO OPEN DRAIN PIPE T&P TO OPEN DRAIN PIPE T&P TO OPEN DRAIN PIPE T&P TO OPEN DRAIN FUSED DISCONNECT SWITCH NOTES: 1. Preferred piping diagram. 2. The temperature and pressure relief valve setting shall not exceed pressure rating of any component in the system. 3. Service valves are shown for servicing unit. However, local codes shall govern their usage. 4. The Tank Temperature Control should be wired to and control the pump between the water heater(s) and the storage tank(s). 5.
Notes 45
Notes 46
Commercial Water Heater Limited Warranty Effective What's NOT covered For 3 Years, in the event of a tank leak, we will repair or, at our • Problems caused by improper: gas supply line sizing, gas type, venting, connections, combustion air, voltage, wiring, or fusing For 1 Year, in the event of part failure, we will repair or, at our discretion, replace the defective part.
A DIVISION OF A. O. SMITH CORPORATION RENTON, WASHINGTON Technical Support: 800 527-1953 Parts Department: 800 433-2515 www.hotwater.com Copyright © 2014 A. O. Smith Corporation, All rights reserved.
