A.O. Smith DSE-5, DSE-120 User Manual

Dura-Power Electric Models

DSE-5 THRU DSE-120 COMMERCIAL WATER HEATERS

• Installation • Operation • Maintenance • Checklist • Limited Warranty

CAUTION TEXT PRINTED OR OUTLINED IN RED CONTAINS INFORMA TION RELATIVE TO YOUR SAFETY. PLEASE READ THOROUGHLY BEFORE INSTALLING AND USING THIS APPLIANCE.

KEEP THIS MANUAL WITH THE HEA TER FOR FUTURE REFERENCE.

WHENEVER MAINTENANCE ADJUSTMENTS OR SERVICE IS REQUIRED.

PRINTED IN U.S.A. 700

A DIVISION OF A.O.SMITH CORPORA TION

RENTON, WASHINGTO N

www.hotwater.com

PART NO. 60047-004 REV.6

SUPERSEDES PART NO. 60047-004 REV . 5

DIMENSIONS

Tank Capacity Maximum All Dimensions in Inches Approx. Ship

in Gallons KW Input A B C D Wt.Lbs.

5 3 20 /12 16 1/4 21 1/2 5 1/4 82 10 6 26 1/4 18 3/4 24 5 1/4 1 0 6 20 18 27 1/4 20 1/2 2 7 5 3/4 1 3 0 30 24 35 3/4 20 1/2 2 7 5 3/4 1 5 0 40 36 45 3/4 20 1/2 2 7 5 3/4 1 9 0 50 90 54 3/4 20 1/2 2 7 5 3/4 2 2 1 65 90 50 1/2 24 1/2 30 1/4 7 26 7

80 90 49 1/4 26 1/2 32 1/4 7 28 5 10 0 90 58 1/4 26 1/2 32 1/4 7 35 4 119 9 0 63 1/4 28 33 3/4 7 1/2 42 0

RECOVERY CAP ACITY

ST ANDARD BTU/ 30° 40° 50° 60° 70° 80° 90° 100° 110° 120° 130° 140° KW INPUT HOUR

3 10,239 41 31 24 20 17 15 13 12 11 10 10 9 6 20,478 82 62 49 41 35 31 27 25 22 21 19 18

9 30,717 123 92 74 62 53 46 41 37 34 31 28 26 12 40,956 164 123 98 82 70 61 55 49 45 41 38 35 15 51,195 205 154 123 102 88 77 68 61 56 51 47 44 18 61,434 246 184 148 123 105 92 82 74 67 62 57 53 24 81,912 328 246 197 164 140 123 109 98 90 82 76 70 30 102,390 410 308 246 205 176 154 137 123 112 103 95 88 36 122,868 492 369 295 246 211 184 164 148 134 123 113 105 45 153,585 615 461 369 307 263 230 205 184 168 154 142 132 54 184,302 738 554 443 359 316 277 246 221 201 185 170 158

60** 204,780 819 615 492 410 351 307 273 246 223 205 189 176 75** 255,975 1025 768 615 512 439 384 341 307 279 256 236 219

90** 307,170 1229 922 738 615 527 461 410 369 335 307 284 263 * Figured at 1KW (3413 Btu) = 4.1 Gallons at 100°F temperature rise. To determine recovery rate per minute, divide recovery rate per hour by 60. NSF ratings may be obtained by multiplying above figures by 0.98. **Available on 50 gallon models or larger.

RECOVERY RA TE IN GALLONS PER HOUR *

T emperature Rise °F

FOREWORD

Detailed installation diagrams are in this manual. These diagrams will serve to provide the installer with a reference for the materials and method of piping suggested. IT IS NECESSARY THAT ALL W A TER PIPING AND THE ELECTRICAL WIRING BE INSTALLED AND CONNECTED AS SHOWN IN THE DIAGRAMS.

Particular attention should be given to the installation of thermometers at the locations indicated in the diagrams as these are necessary for checking the operation of the heater.

In addition to these instructions, the equipment shall be installed in accordance with those installation regulations in force in the local area where installation is to be made. Authorities having jurisdiction shall be consulted before installations are made. BE SURE TO TURN OFF POWER WHEN WORKING ON OR

CONTENTS

P AGE

ROUGH-IN-DIMENSIONS...................................... 2

RECOVERY CAPACITY....................................... 2

FOREWORD ......................................................... 3

APPROV ALS ....................................................... 3

MODEL & RATING PLA TE .................................... 3

GETTING TO KNOW YOUR WA TER HEA TER...... 4

GENERAL SAFETY INFORMATION

Insulation Blankets .............................................. 5

External Damage ................................................. 5

INST ALLATION

Required Ability ................................................... 5

General ................................................................ 5

Location............................................................... 5

Connections ........................................................ 6

Relief Devices ..................................................... 6

T emperature Limiting Control............................... 6

Hydrogen Gas .................................................... 6

PIPING DIAGRAMS .............................................. 7-12

ELECTRICAL

General ................................................................ 13

Branch Circuit ...................................................... 13

NEAR THE ELECTRICAL SYSTEM OF THE HEATER. NEVER TOUCH ELECTRICAL COMPONENTS WITH WET HANDS OR WHEN STANDING IN WATER. WHEN REPLACING FUSES ALWAYS USE THE CORRECT SIZE FOR THE CIRCUIT. SEE PAGE 14.

DO NOT TEST ELECTRICAL SYSTEM BEFORE HEATER IS FILLED WITH WATER, FOLLOW START UP PROCEDURE ON PAGE 17.

The principal components of the heater are identified on page

4. The model and rating plate on page 3 interprets certain markings into useful information. Both of these references should be used to identify the heater, its components and optional equipment.

P AGE

Amperage Table/Overcurrent Protection ........ 14

Heater Circuits ................................................ 14

Control Circuit................................................. 14

Power Circuit .................................................. 14

Wiring Diagram ................................................ 15-17

OPERATION

General............................................................ 17

Filling ................................................................ 17

Start Up ........................................................... 17

T emperature Regulation .................................. 17-18

Draining ........................................................... 18

MAINTENANCE

General............................................................ 18

Flushing ........................................................... 18

Sediment Removal........................................... 18

Lime Scale Removal ........................................ 18-19

Checklist .......................................................... 19-20

Replacement Parts .......................................... 20

LEAKAGE CHECKPOINTS ............................... 21

LIMITED WARRANTY ...................................... 22

APPROVALS

125 PSI Working Pressure

ASME

150 PSI Working Pressure

MODEL & RATING PLATE

All models bear the

National Sanitation

Foundation seal of

approval.

All models are

listed

by Underwriters’

Laboratories, Inc.

(65 thru 120 Gallons)

(5 thru 50 Gallons)

GETTING TO KNOW YOUR W A TER HEA TER

Below is an illustration of the water heater with its features called out. The text of this manual will refer to the items shown.

FIGURE 1

GENERAL SAFETY

INFORMATION

INSULATION BLANKETS

Insulation blankets available to the general public for external use on electric water heaters are not approved for use on your A.O. Smith water heater. The purpose of an insulation blanket is to reduce the standby heat loss encountered with storage tank water heaters. Your A.O. Smith water heater meets or exceeds the National Appliance Energy Conservation Act standards with respect to insulation and standby loss requirements, making an insulation blanket unnecessary.

GENERAL

The installation must conform to these instructions and the local code authority having jurisdiction. Grounding and electrical wiring connected to the water heater must also conform to the latest version of the

70. Copies of these codes may be obtained from American National Standards Institute, 1430 Broadway, New York, NY

10018. If your location requires the installation of the water heater to

comply with National Sanitation Foundation requirements, the heater must be sealed to the floor so as to prevent seepage underneath the heater. The following are recommended sealants that may be used on all types of flooring except concrete: GE Silicone Seal RTV-120, 103, 108 and 109.

NATIONAL ELECTRICAL CODE and NFPA-

Should you choose to apply an insulation blanket to this heater, you should follow these instructions (See Figure 1 for identification of components mentioned below). Failure to follow these instructions can result in fire, asphyxiation, serious personal injury or death.

DO NOT COVER THE JUNCTION BOX EXTERNAL WIRING,

1. THERMOSTATS OR HEATING ELEMENTS ON ELECTRIC WA TER HEA TER.

DO NOT COVER THE TEMPERATURE-PRESSURE RELIEF

2. V AL VE.

3. DO NOT COVER OPERATING INSTRUCTIONS, INSTALLA TION OR SAFETY RELA TED LABELS.

4. DO OBT AIN NEW W ARNING AND INSTRUCTION LABELS FROM A.O. SMITH FOR PLACEMENT ON THE BLANKET DIRECTL Y OVER THE EXISTING LABELS.

5. WATER AND/OR CONDENSATE CAN COLLECT IN AN INSULATION BLANKET. A.O. SMITH WILL NOT BE LIABLE FOR ANY RUST OR CORROSION DAMAGE CAUSED BY THE INSTALLA TION OF INSULA TION BLANKETS.

FAILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT IN SERIOUS PERSONAL INJURY OR DEA TH.

W ARNING

EXTERNAL DAMAGE

DO NOT TEST ELECTRICAL SYSTEM BEFORE HEATER IS FILLED WITH WATER, FOLLOW START UP PROCEDURE AS WRITTEN IN “OPERATION” SECTION OF THIS MANUAL.

The principal components of the heater are identified in figure

1. The model and rating plate on page 3 interprets certain markings into useful information. Both of these references should be used to identify the heater, its components and optional equipment.

LOCATION

For proper installation, the heater should be installed on a level surface.

LOCA TE IT NEAR A FLOOR DRAIN. THE HEA TER SHOULD BE LOCATED IN AN AREA WHERE LEAKAGE FROM THE HEA TER OR CONNECTIONS WILL NOT RESULT IN DAMAGE TO THE ADJACENT AREA OR TO LOWER FLOORS OF THE STRUCTURE.

WHEN SUCH LOCATIONS CANNOT BE A VOIDED, A SUIT ABLE DRAIN PAN SHOULD BE INSTALLED UNDER THE HEATER. Such pans should be fabricated with sides at least 2” deep, with length and width at least 2” greater than the diameter of the heater and must be piped to an adequate drain. Drain pans suitable for these heaters are available from your distributor or A.O. Smith Water Products Company, Product Service Division, 5621 W. 115th St., Alsip, IL 60803.

Locate the heater close to the point of major hot water usage and the power supply.

Do not operate the water heater until it has been fully checked out by a qualified service technician, if the water heater:

• Has been exposed to fire or damage.

• Produces steam or unusually hot water.

If the water heater has been subject to flooding, it must be replaced.

INSTALLATION

REQUIRED ABILITY

INSTALLATION OR SERVICE OF THIS WATER HEATER REQUIRES ABILITY EQUIVALENT TO THAT OF A LICENSED TRADESMAN IN THE FIELD INVOLVED. PLUMBING AND ELECTRICAL WORK INVOLVED.

• Try to make hot water piping and branch circuit wiring as short as possible.

• Insulate hot and cold water piping where heat loss and condensation may be a problem.

THE HEATER SHOULD NOT BE LOCA TED IN AN AREA WHERE IT WILL BE SUBJECT TO FREEZING.

Suggested clearances from adjacent surfaces are 18 inches in front for access to the controls and elements and 12 inches from top. The heater may be installed on or against combustible surfaces.

CONNECTIONS

The heater water inlet is located on the side of the heater near the bottom. The heater outlet is located at the top of the heater.

Piping and wiring diagrams are included in this manual.

RELIEF DEVICES

An unplugged 3/4” relief valve opening is provided for installing temperature and pressure relief valve.

The pressure setting of the relief valve should not exceed the pressure capacity of any component in the system. The temperature setting of the relief valve should not exceed 210°F.

TEMPERATURE LIMITING CONTROL

CAUTION: TO REDUCE THE RISK OF EXCESSIVE PRESSURES

AND TEMPERATURE IN THIS WATER HEATER INSTALL TEMPERATURE AND PRESSURE PROTECTIVE EQUIPMENT REQUIRED BY LOCAL CODES but not less than a combination

temperature and pressure relief valve certified by a nationally recognized testing laboratory that maintains periodic inspection of production of listed equipment or materials, as meeting the requirements for relief valve devices for hot water supply systems, ANSI Z21.22 (latest version).

This valve must be marked with a maximum set pressure not to exceed the marked maximum working pressure of the water heater. INSTALL THE VALVE INTO THE OPENING PROVIDED

AND MARKED FOR THIS PURPOSE IN THE WA TER HEATER, AND ORIENT IT OR PROVIDE TUBING SO THAT ANY DISCHARGE FROM THE VALVE WILL EXIT ONLY WITHIN 6 INCHES ABOVE, OR AT ANY DISTANCE BELOW THE STRUCTURAL FLOOR AND CANNOT CONTACT ANY LIVE ELECTRICAL P ART. THIS DISCHARGE OPENING MUST NOT BE BLOCKED OR REDUCED IN SIZE UNDER ANY CIRCUMSTANCES.

The heater control circuit contains a high temperature cutoff switch which operates if excessive water temperatures are reached. The high temperature cutoff contacts open at 190°F and must be manually reset (after a 30°F drop in water temperature). Disconnect the power before resetting button.

HYDROGEN GAS (FLAMMABLE)

CAUTION

HYDROGEN GAS CAN BE PRODUCED IN A HOT WATER SYSTEM SERVED BY THIS HEATER THAT HAS NOT BEEN USED FOR A LONG PERIOD OF TIME (GENERALLY TWO WEEKS OR MORE). HYDROGEN GAS IS EXTREMELY FLAMMABLE. T o reduce the risk of injury under these conditions,

it is recommended that the hot water faucet be opened for several minutes at the kitchen sink before using any electrical appliance connected to the hot water system. If hydrogen is present, there will probably be an unusual sound such as air escaping through the pipe as the water begins to flow. THERE

SHOULD BE NO SMOKING OR OPEN FLAME NEAR THE FAUCET A T THE TIME IT IS OPEN.

PIPING DIAGRAM

ONE OR TWO TEMPERATURE - ONE HEATER

CAUTION: IF BUILDING COLD WATER SUPPLY HAS A BACK-FLOW PREVENTER, CHECK VALVE OR WATER METER WITH CHECK VA LVE, PROVISIONS FOR THERMAL EXPANSION OF W A TER IN THE HOT W A TER SYSTEM MUST BE PROVIDED.

*PIPE TO OPEN DRAIN.

INSTALL IN ACCORDANCE WITH ALL LOCAL CODES.

ONE OR TWO TEMPERATURE - TWO HEATER

DANGER:

TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON P AGES 17 & 18. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES..

ONE OR TWO TEMPERATURE - THREE HEATERS

CAUTION: IF BUILDING COLD WATER SUPPLY HAS A BACK-FLOW PREVENTER, CHECK VALVE OR WATER METER WITH CHECK VA LVE, PROVISIONS FOR THERMAL EXPANSION OF W A TER IN THE HOT W A TER SYSTEM MUST BE PROVIDED.

*PIPE TO OPEN DRAIN.

INSTALL IN ACCORDANCE WITH ALL LOCAL CODES.

ONE OR TWO TEMPERATURE - FOUR HEATERS

DANGER:

TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON P AGES 17 &

18. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUA TE BOOSTER OUTPUT , ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES..

+ 16 hidden pages