A.O. Smith DEL-6, DEL-10, DEL-15, DEL-20 Installation Manual
Instruction Manual
COMMERCIAL LIGHT DUTY ELECTRIC WATER HEATERS
Compact 6/10/15/20 Models Series 102
Lowboy 30/40/50 Models Series 110
Tall 30/40/52/66/80/120 Models Series 110
INSTALLATION - OPERATION - SERVICE
- MAINTENANCE
Thank you for buying this energy efcient water heater.
We appreciate your condence in our products.
Read and understand this instruction
manual and the safety messages
herein before installing, operating or
servicing this water heater.
Failure to follow these instructions and
safety messages could result in death
or serious injury.
This manual must remain with the
water heater.
PLACE THESE INSTRUCTIONS ADJACENT TO HEATER AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.
Electrical Shock Hazard
If the water 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 qualified service
agency before it is placed in operation.
PRINTED 0618
100303948 2000199954 (Rev. H)
1
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 a potential injury hazard. Read and obey all safety messages and instructions throughout this manual.
It is very important that the meaning of each safety message is understood by you and others who install, use, or service
this water heater.
This is the safety alert symbol. It is used to alert you to
potential personal injury hazards. Obey all safety
messages that follow this symbol to avoid possible
injury or death.
DANGER indicates an imminently
DANGER
WARNING
CAUTION
hazardous situation which, if not avoided,
will result in injury or death.
WARNING indicates a potentially hazardous
situation which, if not avoided, could result
in injury or death.
CAUTION indicates a potentially hazardous
situation which, if not avoided, could result in
minor or moderate injury.
CAUTION used without the safety alert
CAUTION
All safety messages will generally tell you about the type of hazard, what can happen if you do not follow the safety message,
and how to avoid the risk of injury.
symbol indicates a potentially hazardous
situation which, if not avoided, could result in
property damage.
IMPORTANT DEFINITIONS
• Qualied Installer or Service Agency
Installation and service of this water heater requires ability equivalent to that of a Qualied Agency (as dened by ANSI
below) in the eld involved. Installation skills, such as plumbing, air supply, venting, gas supply, and electrical supply are
required in addition to electrical testing skills when performing service.
• ANSI Z223.1 2006 Sec. 3.3.83:
“Qualied Agency” - “Any individual, rm, corporation or company that either in person or through a representative is
engaged in and is responsible for (a) the installation, testing or replacement of gas piping or (b) the connection, installation,
testing, repair or servicing of appliances and equipment; that is experienced in such work; that is familiar with all precautions
required; and that has complied with all the requirements of the authority having jurisdiction.”
2
GENERAL SAFETY INFORMATION
Water temperature over 125°F (52°C)
can cause severe burns instantly
resulting in severe injury or death.
Children, the elderly and the
physically or mentally disabled are at
highest risk for scald injury.
Feel water before bathing or
showering.
Temperature limiting devices such as
mixing valves must be installed
when required by codes and to
ensure safe temperatures at fixtures.
Explosion Hazard
Overheated water can cause
water tank explosion.
Properly sized temperature and
pressure relief valve must be
installed in the opening provided.
Improper installation, use and service may result
in property damage.
Do not operate water heater if exposed to flooding or
water damage.
•
Inspect anode rods regularly, replace if damaged.
•
Install in location with drainage.
•
Fill tank with water before operation.
•
Properly sized thermal expansion tanks are required on all
closed water systems.
•
Refer to this manual for installation and service.
CAUTION
Turn off power at the branch circuit
breaker serving the water heater
before performing any service.
Electrical Shock Hazard
•
Label all wires prior to disconnecting
when performing service. Wiring errors
can cause improper and dangerous
operation.
•
Verify proper operation after servicing.
•
Failure to follow these instructions can
result in personal injury or death.
•
Explosion Hazard
Flammable hydrogen gases
may be present.
Keep all ignition sources away
from faucet when turning on
hot water.
PRECAUTIONS
DO NOT USE THIS WATER HEATER IF ANY PART HAS BEEN
EXPOSED TO FLOODING OR WATER DAMAGE. Immediately
call a qualied 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 qualied service technician.
1. External re.
2. Damage.
3. Firing without water.
GROUNDING INSTRUCTIONS
This water heater must be grounded in accordance with the
National Electrical Code and/or local codes. These must be
followed in all cases.
This water heater must be connected to a grounded metal,
permanent wiring system; or an equipment grounding conductor
must be run with the circuit conductors and connected to the
equipment grounding terminal or lead on the water heater.
When servicing this unit, verify the power to the unit is turned off prior to opening the control cabinet door.
HYDROGEN GAS (FLAMMABLE)
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
ammable. 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 ow. THERE SHOULD BE NO
SMOKING OR OPEN FLAME NEAR THE FAUCET AT THE
TIME IT IS OPEN.
Read and understand this instruction
manual and the safety messages
herein before installing, operating or
servicing this water heater.
Failure to follow these instructions and
safety messages could result in death
or serious injury.
This manual must remain with the
water heater.
3
Turn off power at the branch circuit
breaker serving the water heater
before performing any service.
Electrical Shock Hazard
•
Label all wires prior to disconnecting
when performing service. Wiring errors
can cause improper and dangerous
operation.
•
Verify proper operation after servicing.
•
Failure to follow these instructions can
result in personal injury or death.
•
TABLE OF CONTENTS
GENERAL SAFETY INFORMATION .................................. 3
Precautions ....................................................................3
Hydrogen Gas (Flammable) ...........................................3
INTRODUCTION ................................................................ 4
Abbreviations Used ........................................................4
Preparing for the Installation ..........................................4
DIMENSIONS AND CAPACITIES DATA ............................ 5
APPROVALS ...................................................................... 6
MODEL AND RATING ........................................................ 6
FEATURES AND COMPONENTS ..................................... 7
Electronic Control Models ..............................................7
LOCATING THE NEW WATER HEATER ........................... 8
Facts to Consider About the Location ............................8
Clearances .....................................................................8
INSTALLATION .................................................................. 9
Required Ability ..............................................................9
General ...........................................................................9
Mixing Valve Usage: .......................................................9
Contaminated Water .......................................................9
Circulating Pump ............................................................9
Insulation Blankets ........................................................10
Hard Water ....................................................................10
Closed Water Systems ..................................................10
Thermal Expansion .......................................................10
Temperature-Pressure Relief Valve ...............................10
ELECTRICAL ................................................................... 12
General ..........................................................................12
Branch Circuit ................................................................12
Calculating Amperage/Over-Current Protection ............12
WIRING DIAGRAMS ........................................................ 13
OPERATION ..................................................................... 14
General ..........................................................................14
Filling the Water Heater .................................................14
Initial Start Up ................................................................14
Draining the Water Heater .............................................14
TEMPERATURE REGULATION ...................................... 15
Temperature Adjustment ...............................................15
MAINTENANCE ............................................................... 16
General ..........................................................................16
ANODE ROD Maintenance ...........................................16
Temperature-Pressure Relief Valve Test .......................16
TROUBLESHOOTING CHECKLIST ................................ 17
Checklist ........................................................................17
Leakage Checkpoints ....................................................18
INTRODUCTION
Thank You for purchasing this boiler. Properly installed and
maintained, it should give you years of trouble-free service.
ABBREVIATIONS USED
Abbreviations found in this Instruction Manual include:
• ANSI - American National Standards Institute
• ASME - American Society of Mechanical Engineers
• NEC - National Electrical Code
• NFPA - National Fire Protection Association
• UL - Underwriters Laboratory
• CSA - Canadian Standards Association
PREPARING FOR THE INSTALLATION
1. Read the “General Safety Information” section of this manual
rst and then the entire manual carefully. If you don’t follow
the safety rules, the water heater may not operate safely. It
could cause DEATH, SERIOUS BODILY INJURY AND/OR
PROPERTY DAMAGE.
This manual contains instructions for the installation,
operation, and maintenance of the electric water heater.
It also contains warnings throughout the manual that
you must read and be aware of. All warnings and all
instructions are essential to the proper operation of
the water heater and your safety. READ THE ENTIRE
MANUAL BEFORE ATTEMPTING TO INSTALL OR
OPERATE THE WATER HEATER.
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 Wiring Diagrams (page 13).
The model and rating plates on page 6 interpret
certain markings into useful information. Both of these
references should be used to identify the heater, its
components and optional equipment.
2. 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 latest editions of the National
Electrical Code, NFPA 70 or the Canadian Electrical Code CSA
C22.1. The National Electrical Code may be ordered from:
National Fire Protection Association, 1 Batterymarch Park,
Quincy, MA 02269. The Canadian Electrical Code is available
from the Canadian Standards Association, 8501 East Pleasant
Valley Road, Cleveland, OH 44131.
3. If after reading this manual you have any questions or do not
understand any portion of the instructions, call the toll free
number listed on the water heater label for technical assistance.
A sample rating plate is shown on page 6 of this
manual. In order to expedite your request, please have
full model and serial number available for the technician.
4. Carefully plan your intended placement of the water heater.
Examine the location to ensure the water heater complies with
the “Locating the New Water Heater” section in this manual.
Installation and service of this water heater requires ability
equivalent to that of a licensed tradesman or qualied
agency (see Important Denitions on page 2) in the
eld involved. Plumbing and electrical work are required.
4
DIMENSIONS AND CAPACITIES DATA
Figure 1. Dimensions and Capacities for Each Type of Water Heater
Table 1. Rough-In Dimensions
Models
Dimensions
Compact-6 1 6 23 15 1/2 394 14 1/4 362 11 279 - - 35 15.9
Compact-10 1 10 38 18 1/4 464 18 457 12 1/2 318 - - 54 24.5
Compact-15 1 15 57 26 660 18 457 20 1/2 521 - - 58 26.3
Compact-20 1 20 76 22 1/4 565 21 3/4 552 15 3/8 391 - - 73 33.1
Lowboy-30 2 30 114 30 7/8 784 21 3/4 552 24 1/8 613 8 203 100 45.4
Lowboy-40 2 40 151 32 1/4 819 24 610 25 9/16 649 8 203 125 56.7
Lowboy-50 2 50 189 32 1/4 819 26 1/2 673 25 1/8 638 8 203 166 75.3
Tall-30 2 30 114 34 1/2 876 20 1/2 521 - - 8 203 98 44.5
Tall-40 2 40 151 45 1/8 1146 20 1/2 521 - - 8 203 113 51.3
Tall-52 2 50 189 54 7/8 1394 20 1/2 521 - - 8 203 131 59.4
Tall-66 2 66 250 60 3/4 1543 21 3/4 552 - - 8 203 176 79.8
Tall-80 2 80 303 59 3/8 1508 24 610 - - 8 203 2 11 95.7
Tall-120 2 11 9 450 62 7/16 1586 29 3/8 746 - - 8 203 326 147.9
No. of
Elements
Tank Capacity A B C D
US Gals. Liters inches mm inches mm inches mm inches mm Lbs. Kg.
Approx.
Shipping Weight
Table 2. U.S. Gallons/Hr and Litres/Hr at TEMPERATURE RISE INDICATED
Element
Wattage
(Upper/Lower)
/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
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 4.1 and divide by temperature rise. Full load current for single phase = total watts : voltage.
INPUT
KW
F° 36 F° 40 F° 54 F° 60 F° 72 F° 80 F° 90 F° 100° F 108 F° 120 F° 126 F°
C° 20 C° 22.2 C 30C° 33.3C° 40C° 44.4C° 50C° 55.5C° 60C° 66.6C° 70C°
NON-SIMULTANEOUS
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
3.0 LPH 128 11 5 85 77 64 58 51 46 43 38 37
4.0 LPH 170 153 114 102 85 77 68 61 57 51 49
4.5 LPH 192 173 128 11 5 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 11 5 102 92 85 77 73
SIMULTANEOUS OPERATION
6 LPH 256 230 170 153 128 11 5 102 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 11 5 11 0
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
5
All models are listed by
Underwriters Laboratories Inc.
APPROVALS
MODEL AND RATING
Figure 2. Lowboy and Tall-30/40/66/80/120 Figure 3. Compact-6/10/15/20
6
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