A.O. Smith dre-100, Instruction Manual

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thank you for purchasing this water heater. Properly installed and
maintained, it should give you years of trouble free service.
Abbreviations Found In This Instruction Manual:
• ANSI - American National Standards Institute
• ASME - American Society of Mechanical Engineers
• GAMA - Gas Appliance Manufacturer’s Association
• NEC - National Electrical Code
• NFPA - National Fire Protection Association
• UL - Underwriters Laboratory
preparInG for the InstallatIon
1. Read the “General Safety Information” section of this manual first 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.
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.
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 13.
The principal components of the heater are identified on pages 7 & 8.
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.
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 code requirements, follow NFPA-70
(current edition). 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 back cover of this manual 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 qualified agency (page 2) in the
field involved. Plumbing and electrical work are required.
5. For installation in California this water heater must be braced or
anchored to avoid falling or moving during an earthquake. See
instructions for correct installation procedures. Instructions may be
obtained from California Office of the State Architect, 1102 Q Street,
Suite 5100, Sacramento, CA 95811.
6. Massachusetts Code requires this water heater to be installed in
accordance with Massachusetts 248-CMR 2.00: State Plumbing Code
and 248-CMR 5.00.
IntroductIon
SAFE INSTALLATION, USE AND SERVICE ..................................... 2
GENERAL SAFETY INFORMATION ................................................. 3
TABLE OF CONTENTS .....................................................................4
INTRODUCTION ...............................................................................4
Preparing for the New Installation .............................................4
DIMENSIONS AND CAPACITIES DATA ...........................................5
APPROVALS .....................................................................................6
FEATURES AND COMPONENTS .................................................7-8
LOCATING THE NEW WATER HEATER ..........................................9
INSTALLATION ...............................................................................10
Required Ability ........................................................................10
General ....................................................................................10
Mixing Valve Usage .................................................................10
Chemical Vapor Corrosion .......................................................10
Circulating Pump .....................................................................10
Insulation Blankets ..................................................................10
Temperature-Pressure Relief Valve .................................... 10-11
Water Line Connection ............................................................ 11
Closed Water System .............................................................. 11
Thermal Expansion .................................................................. 11
ELECTRICAL ..................................................................................12
OPERATION ....................................................................................19
General ....................................................................................19
Filling the Water Heater ...........................................................19
Start Up ...................................................................................19
Draining the Water Heater .......................................................19
TEMPERATURE REGULATION .....................................................20
High Temperature Devices ......................................................20
Thermostat Controls ................................................................20
Thermostat Settings – Surface Mount Control Models ............ 20
Thermostat Settings – Electronic Control Models ................... 21
ELECTRONIC CONTROL MODELS OPERATION ......................... 21
Control System Features .........................................................21
Control System Navigation ......................................................21
Desktop Screen .................................................................. 21-23
Temperatures Menu ............................................................ 23-24
Temperature Settings ..............................................................24
Heater Status Menu .................................................................25
Economy Mode Setup Menu ..............................................25-26
Economy Mode Settings .....................................................26-28
Alarm Output Setup Menu .......................................................29
Display Settings Menu .............................................................29
Heater Information Menu .................................................... 29-30
Current Fault / Alert Menu ....................................................... 30
Fault Occurrence Menu ........................................................... 30
Restore Factory Defaults Menu .......................................... 30-31
MAINTENANCE .............................................................................. 31
General ............................................................................... 31-32
Flushing ................................................................................... 32
Sediment Removal .................................................................. 32
Water and Lime Scale Removal .............................................. 32
TROUBLESHOOTING CHECKLIST ............................................... 33
Not Enough or No Water ......................................................... 33
Water Heater Makes Strange Sounds ..................................... 33
If You Cannot Identify or Correct the Source of Malfunction ............ 17
Leakage Checkpoints .............................................................. 34
PIPING DIAGRAMS ................................................................... 35-42
WARRANTY .................................................................................... 43
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