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

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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

INFORMATION RELATIVE TO YOUR SAFETY. PLEASE READ

THOROUGHLY BEFORE INSTALLING AND USING THIS

APPLIANCE. A DIVISION OF A.O.SMITH CORPORATION RENTON, WASHINGTON

www.hotwater.com

	KEEP THIS MANUAL WITH THE HEATER FOR FUTURE REFERENCE.
	WHENEVER MAINTENANCE ADJUSTMENTS OR SERVICE IS REQUIRED.
PRINTED IN U.S.A. 700	PART NO. 60047-004 REV.6
PRINTED IN U.S.A. 700	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	106
20	18	27 1/4	20 1/2	27	5 3/4	130
30	24	35 3/4	20 1/2	27	5 3/4	150
40	36	45 3/4	20 1/2	27	5 3/4	190
50	90	54 3/4	20 1/2	27	5 3/4	221
65	90	50 1/2	24 1/2	30 1/4	7	267
80	90	49 1/4	26 1/2	32 1/4	7	285
100	90	58 1/4	26 1/2	32 1/4	7	354
119	90	63 1/4	28	33 3/4	7 1/2	420

RECOVERY CAPACITY

RECOVERY RATE IN GALLONS PER HOUR *

Temperature Rise °F

STANDARD	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.

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 WATER 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

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.

CONTENTS

	PAGE		PAGE
ROUGH-IN-DIMENSIONS ......................................	2	Amperage Table/Overcurrent Protection ........	14
RECOVERY CAPACITY .......................................	2	Heater Circuits ................................................	14
FOREWORD .........................................................	3	Control Circuit .................................................	14
APPROVALS .......................................................	3	Power Circuit ..................................................	14
MODEL & RATING PLATE ....................................	3	Wiring Diagram ................................................	15-17
GETTING TO KNOW YOUR WATER HEATER ......	4	OPERATION
GENERAL SAFETY INFORMATION		General ............................................................	17
Insulation Blankets ..............................................	5	Filling ................................................................	17
External Damage .................................................	5	Start Up ...........................................................	17
INSTALLATION		Temperature Regulation ..................................	17-18
Required Ability ...................................................	5	Draining ...........................................................	18
General ................................................................	5	MAINTENANCE
Location ...............................................................	5	General ............................................................	18
Connections ........................................................	6	Flushing ...........................................................	18
Relief Devices .....................................................	6	Sediment Removal ...........................................	18
Temperature Limiting Control ...............................	6	Lime Scale Removal ........................................	18-19
Hydrogen Gas ....................................................	6	Checklist ..........................................................	19-20
PIPING DIAGRAMS ..............................................	7-12	Replacement Parts ..........................................	20
ELECTRICAL		LEAKAGE CHECKPOINTS ...............................	21
General ................................................................	13	LIMITED WARRANTY ......................................	22
Branch Circuit ......................................................	13

APPROVALS		MODEL & RATING PLATE

All models bear the National Sanitation Foundation seal of approval.

All models are listed

by Underwriters’ Laboratories, Inc.

125 PSI Working Pressure ASME (65 thru 120 Gallons)

150 PSI Working Pressure (5 thru 50 Gallons)

GETTING TO KNOW YOUR WATER HEATER

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.

WARNING

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.

1.DO NOT COVER THE JUNCTION BOX EXTERNAL WIRING, THERMOSTATS OR HEATING ELEMENTS ON ELECTRIC WATER HEATER.

2.DO NOT COVER THE TEMPERATURE-PRESSURE RELIEF VALVE.

3.DO NOT COVER OPERATING INSTRUCTIONS, INSTALLATION OR SAFETY RELATED LABELS.

4.DO OBTAIN NEW WARNING AND INSTRUCTION LABELS FROM A.O. SMITH FOR PLACEMENT ON THE BLANKET DIRECTLY 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 INSTALLATION OF INSULATION BLANKETS.

WARNING

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

EXTERNAL DAMAGE

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.

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 NATIONAL ELECTRICAL CODE and NFPA70. 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.

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.

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

WHEN SUCH LOCATIONS CANNOT BE AVOIDED, A SUITABLE 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.

•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 LOCATED 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.

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 WATER 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 PART. THIS DISCHARGE OPENING MUST NOT BE BLOCKED OR REDUCED IN SIZE UNDER ANY CIRCUMSTANCES.

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

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. To 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 AT 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 VALVE, PROVISIONS FOR THERMAL

EXPANSION OF WATER IN THE HOT WATER 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 PAGES 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