A.O. Smith DEN, DEL User Manual

MODELS DEN AND DEL

COMMERCIAL ELECTRIC WATER HEATERS

• Installation • Electrical • Wiring Diagrams • Replacement Parts

• Operation • Maintenance • Leakage Checkpoints • Limited Warranty

A DIVISION OF A. O. SMITH CORPORATION

McBee, South Carolina, USA

www.hotwater.com

CAUTION

TEXT PRINTED OR OUTLINED IN RED CONTAINS INFORMATION RELATIVE TO YOUR SAFETY.

PLEASE READ THOROUGHLY BEFORE INSTALLING AND USING THIS APPLIANCE.

PLACE THESE INSTRUCTIONS ADJACENT TO HEATER AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.

Printed in U.S.A. 0704 PART NO. 195201-000

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ROUGH-IN DIMENSIONS

* NO SIDE OUTLET AVAILABLE
FOR DEL 6 MODELS

ROUGH-IN DIMENSIONS

Models No. of Tank Capacity A B C D Shipping Weight.

Dimensions Elements US Gals. Litres inches mm inches mm inches mm inches mm Lbs. Kg.

DEL-6 1 6 23 15 1/2 394 14 1/4 362 11 279 - - 35 15.9
DEL-10 1 10 38 18 1/4 464 18 457 12 1/2 318 - - 54 24.5
DEL-15 1 15 57 26 660 18 457 20 1/2 521 - - 58 26.3
DEL-20 1 20 76 22 1/4 565 21 3/4 552 15 3/8 391 - - 73 33.1
DEL-30 2 30 114 30 7/8 784 21 3/4 552 24 1/8 613 8 203 100 45.4
DEL-40 2 40 151 32 1/4 819 24 610 25 9/16 649 8 203 125 56.7
DEL-50 2 50 189 32 1/4 819 26 1/2 673 25 1/8 638 8 203 166 75.3
DEN-30 1 30 114 34 1/2 876 20 1/2 521 - - 8 203 98 44.5
DEN-40 2 40 151 45 1/8 1146 20 1/2 521 - - 8 203 113 51.3
DEN-52 2 50 189 54 7/8 1394 20 1/2 521 - - 8 203 131 59.4
DEN-66 2 66 250 60 3/4 1543 21 3/4 552 - - 8 203 176 79.8
DEN-80 2 80 303 59 3/8 1508 24 610 - - 8 203 211 95.7

DEN-120 2 119 450 62 7/16 1586 29 3/8 746 - - 8 203 326 147.9

Approx.

RECOVERY CAPACITIES

Element U.S. Gallons/Hr and Litres/Hr at TEMPERATURE RISE INDICATED
Wattage INPUT F° 36F° 40F° 54F° 60F° 72F° 80F° 90F° 100F° 108F° 120F° 126F°
(Upper/Lower) KW C° 20C° 22.2C° 30C° 33.3C° 40C° 44.4C° 50C° 55.5C° 60C° 66.6C° 70C°

NON-SIMULATANEOUS OPERATION

/1500 GPH 17 15 11 10 8 8 7 6 6 5 5

/2000 GPH 23 20 15 14 11 10 9 8 8 7 6

/2500 GPH 28 25 19 17 14 13 11 10 9 8 8

3000/3000 GPH 34 30 23 20 17 15 14 12 11 10 10

4000/4000 GPH 45 41 30 27 23 20 18 16 15 14 13

4500/4500 GPH 51 46 34 30 25 23 20 18 17 15 14

5000/5000 GPH 56 51 38 34 28 25 23 20 19 17 16

6000/6000 GPH 68 61 45 41 34 30 27 24 23 20 19

SIMULATANEOUS OPERATION

3000/3000 GPH 68 61 45 41 34 30 27 24 23 20 19

4000/4000 GPH 90 81 60 54 45 41 36 32 30 27 26

4500/4500 GPH 101 91 68 61 51 46 41 36 34 30 29

5000/5000 GPH 113 101 75 68 56 51 45 41 38 34 32

6000/6000 GPH 135 122 90 81 68 61 54 49 45 41 39

Recovery capacities at 100° F rise equal: for non-simultaneous element operation = 4.1 gal. x KW of one element; for simultaneous element operation
= 4.1 gal. x 2/3 KW of both elements. For other rises multiply element KW as previously explained by 410 and divide by temperature rise. Full load current for single
phase = total watts : voltage.

1.5 LPH 64 58 43 38 32 29 26 23 21 19 18

2.0 LPH 85 77 57 51 43 38 34 31 28 26 24

2.5 LPH 107 96 71 64 53 48 43 38 36 32 30

3.0LPH1281158577645851 46433837

4.0 LPH 170 153 114 102 85 77 68 61 57 51 49

4.5 LPH 192 173 128 115 96 86 77 69 64 58 55

5.0 LPH 213 192 142 128 107 96 85 77 71 64 61

6.0 LPH 256 230 170 153 128 115 102 92 85 77 73

6 LPH 256 230 170 153 128 115 102 92 85 77 73

8 LPH 341 307 227 205 170 153 136 123 114 102 97

9 LPH 384 345 256 230 192 173 153 138 128 115 110

10 LPH 426 384 284 256 213 192 170 153 142 128 122

12 LPH 511 460 341 307 256 230 205 184 170 153 146

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FOREWORD

• Do obtain new labels from A. O. Smith for placement on the
blanket directly over the existing labels.

Thank you for buying this energy efficient water heater from
A.O. Smith Water Products Company. We appreciate your
confidence in our products. 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.

In addition to these instructions, the equipment shall be installed
in accordance with those installation regulations in force in the
local area where the installation is to be made. Authorities having
jurisdiction shall be consulted before installations are made.

GENERAL SAFETY

INSTRUCTIONS

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.

The principal components of the heater are identified on page 5.
The model and rating plate on page 6 interprets certain markings
into useful information. Both of these references should be
used to identify the heater, its components and optional
equipment.

WARNING

FOR CALIFORNIA INSTALLATION THIS WATER HEATER MUST
BE BRACED, ANCHORED, OR STRAPPED TO AVOID FALLING
OR MOVING DURING AN EARTHQUAKE. SEE INSTRUCTIONS
FOR CORRECT INSTALLATION PROCEDURES.
INSTRUCTIONS MAY BE OBTAINED FROM YOUR LOCAL
DEALER, WHOLESALER, PUBLIC UTILITIES OR CALIFORNIA’S
OFFICE OF STATE ARCHITECT, 400 P STREET, SACRAMENTO,
CA 95814.

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 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 page 5 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 temperature & pressure relief valve.

• Do not cover the instruction manual. Keep it on the side of
the water heater or nearby for future reference.

EXTENDED NON-USE PERIODS

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 a nearby 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 OPENED.

CAUTION

AN ELECTRICAL GROUND IS REQUIRED TO REDUCE RISK
OF ELECTRIC SHOCK OR POSSIBLE ELECTROCUTION. THE
GROUND SCREW AT THE JUNCTION BOX IS FOR BONDING
THE HEATER TO A GROUNDED SERVICE ENTRANCE
CONDUCTOR, A GROUNDED SERVICE ENTRANCE RACEWAY,
OR AN EARTH GROUNDING ELECTRODE CONDUCTOR.

WARNING

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

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 ARE REQUIRED.

GENERAL

The installation must conform to these instructions, the local
code authority having jurisdiction, and the requirements of the
power company. In the absence of code requirements follow
the latest edition of NFPA-70, The National Electrical Code which
may be ordered from: National Fire Protection Association,
1 Batterymarch Park, Quincy, MA 02269.

LOCATION

The water heater should be located as close as possible to/or
centralized to the water piping system. The water heater should
be located in an area not subject to freezing temperatures.

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.

When such locations cannot be avoided, a suitable drain pan
should be installed under the heater.

Such pans should be at least two inches deep, have a minimum
length and width of at least two inches greater than the diameter
of the heater and should be piped to an adequate drain.

Drain pans suitable for these heaters are available from your
distributor or A. O. Smith Products Service Division,
5621 W. 115th Street, Alsip, IL 60803.

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CLEARANCES

A minimum clearance of 4” must be allowed for access to
replaceable parts such as the thermostats, drain valve and relief
valve.

Adequate clearance for servicing this appliance should be
considered before installation, such as changing the anodes,
etc.

FLOOD WARNING

IF THE HEATER BECOMES IMMERSED IN WATER UP TO OR
ABOVE THE LEVEL OF THE BOTTOM OF THE ELEMENT
DOORS, THE HEATER SHOULD BE EXAMINED BY A
COMPETENT SERVICE PERSON BEFORE IT IS PLACED IN
OPERATION.

CHEMICAL VAPOR CORROSION

Water heater corrosion and component failure can be caused by
the heating and breakdown of airborne chemical vapors. Spray
can propellants, cleaning solvents, refrigerator and air
conditioning refrigerants, swimming pool chemicals, calcium
and sodium chloride, waxes, and process chemicals are typical
compounds which are potentially corrosive. These materials
are corrosive at very low concentration levels with little or no odor
to reveal their presence.

CALCULATING

AMPERAGE/OVERCURRENT PROTECTION

The heaters come from the factory in two configurations:

1. Two wire C-2 circuit for single element heater equipped with
a high limit control, single phase power input.

2. Four wire A-8 circuit for dual element heater equipped with
two high limit controls, single phase or three phase power
input.

The heater with dual elements is factory wired for connection to
a three wire, three-phase delta branch circuit, non-simultaneous
operation. In addition a ground conductor is required.

Element connection is for non-simultaneous operation. This
means only one element at a time operates. The wiring diagram
(on page 5) shows the heater may be field converted to
simultaneous element operation by moving the red wire on
“J” terminal to L1. It is then possible for both elements to operate
at once as determined by the thermostats. Regardless of
element connection the heater operates in an “unbalanced”
fashion.

The heater may be field converted to single-phase operation by
moving the wire on L3 of the terminal block to L2. L3 is not
used. (See page 5).

Products of this sort should not be stored near the heater. Also,
air which is brought in contact with the water heater should not
contain any of these chemicals. If necessary, uncontaminated
air should be obtained from remote or outside sources.

ELECTRICAL (GENERAL)

Check the 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. Contact the heater supplier for conversion

information if necessary.

Voltage applied to the heater should not vary more than +5%
to -10% of the model and rating plate marking for satisfactory
operation.

DO NOT ENERGIZE THE BRANCH CIRCUIT FOR ANY REASON
BEFORE THE HEATER TANK IS FILLED WITH WATER. DOING

SO WILL CAUSE THE HEATING ELEMENTS TO BURN OUT.

The factory wiring is attached to a terminal block within external
junction box unit. The branch circuit is connected to terminal
block within this junction box. The water heater should be
connected to a separate, grounded, branch circuit with overcurrent
protection and disconnect switch. The water heater should be
grounded in accordance with national and local codes.

BRANCH CIRCUIT

The heater, now in single-phase non-simultaneous operation,
may be field-converted to single phase simultaneous operation
by moving the red wire on terminal “J” to L1, refer to wiring
diagram on page 5.

This is an example of calculating heater amperage for both
types of element operation. From this, the branch circuit
conductor and overcurrent protection sizing can be established.

The example is of a three-phase 240 volt unit with two, 6 kw
elements. The notations are for units field converted to
single-phase. Check the heater model and rating plate for actual
specifications and substitute those values in the following.

Non-simultaneous: Simultaneous:
(as factory wired) (Field conversion)

3000 : 240 = 12.5 amps* 3000 : 240 = 12.5 amps*

12.5 x 1.73 = 21.6 amps

*NOTE: as a single-phase *NOTE: as a single-phase
non-simultaneous unit. simultaneous unit the

total is:

12.5 x 2 = 25 amps

The rating of the overcurrent protection should be computed on
the basis of 125 percent of the total connected load amperage.
Where the standard ratings and settings do not correspond
with this computation, the next higher standard rating or setting
should be selected.

The branch circuit wire size should be established through
reference to the latest edition of NFPA-70, the
National Electrical Code or other locally approved source in
conjunction with the heater amperage rating. For convenience,
portions of the wire size tables from the Code are reproduced
here. It is suggested the electrician size the branch circuit at 125
percent of the heater rating and further increase wire size as
necessary to compensate for voltage drop in long runs.

Portion of Table 310-16 follows:

Allowable Ampacities of Insulated Copper Conductors. Not
more than three conductors in Raceway or Cable or Direct Burial
(Based on Ambient Temperature of 30° C, 86° F).

These ampacities relate only to conductors described in Table
310-13 in Code.

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