AO Smith Water Heater AOSRE50400 User Manual

instruction manual  
residential electric  
2.5 Gallon 120 volt  
water heater  
for potaBle water  
heatinG onlY  
not suitaBle for  
space heatinG  
listed  
all technicaland warrantY questions: SHOULD BE DIRECTED TO THE LOCALDEALER FROM WHOM THE WATER HEATER WAS  
PURCHASED. IFYOUARE UNSUCCESSFUL, PLEASE WRITETOTHE COMPANYLISTED ONTHE RATING PLATE ONTHE WATER HEATER.  
Keep this manual in the pocKet on heater for future reference  
when ever maintenance adjustment or service is required.  
PRINTED 0707  
85834-000  
safe installation, use and service  
Your safety and the safety of others is extremely important in the installation, use, and servicing of this water heater.  
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.  
danGerindicatesanimminentlyhazardous  
situation which, if not avoided, could result  
in death or injury.  
danGer  
warninG indicates a potentially hazardous  
situation which, if not avoided, could result  
in death or injury.  
warninG  
caution indicates a potentially hazardous  
situation which, if not avoided, may result  
in minor or moderate injury.  
caution  
caution used without the safety alert  
symbol indicates a potentially hazardous  
situation which, if not avoided, could result  
in property damage.  
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.  
the california safe drinking water and toxic enforcement act requires the Governor of california to publish a list of substances  
known to the state of california to cause cancer, birth defects, or other reproductive harm, and requires businesses to warn of  
potential exposure to such substances.  
this product contains a chemical known to the state of california to cause cancer, birth defects, or other reproductive harm. this  
appliance can cause low level exposure to some of the substances listed, including formaldehyde.  
important definitions  
Qualified Installer: A qualified installer must have ability equivalent to a licensed tradesman in the fields of plumbing and electrical  
installation of these appliances. This would include a thorough understanding of the requirements of the National Electrical Code and  
applicable local electrical and plumbing codes (and tools necessary to confirm proper installation and operation of the water heater) as  
they relate to the installation of electric water heaters. The qualified installer must have a thorough understanding of the water heater  
Instruction Manual.  
service agency: A service agency also must have ability equivalent to a licensed tradesman in the fields of plumbing and electrical  
installation of these appliances. This would include a thorough understanding of the requirements of the National Electrical Code and  
applicable local electrical and plumbing codes (and tools necessary to confirm proper installation and operation of the water heater) as  
they relate to the installation of electric water heaters. The service agency must have a thorough understanding of the water heater  
Instruction Manual.  
General safetY  
3
introduction  
thank You for purchasing this water heater. Properly installed and  
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 code requirements  
follow NFPA-70, the National Electrical Code (current edition),  
which may be ordered from: National Fire ProtectionAssociation,  
1 Batterymarch Park, Quincy, MA 02269.  
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  
NEC - National Electrical Code  
3. If after reading this manual you have any questions or do not  
understand any portion of the instructions, call the local utility or  
the manufacturer whose name appears on the rating plate.  
NFPA - National Fire Protection Association  
UL - Underwriters Laboratories Inc.  
4. Carefully plan your intended placement of the water heater.  
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.  
preparinG for the installation  
1. Read the “General Safety” section of this manual first and then  
the entire manual carefully. If you don’t follow the safety rules,  
the water heater will not operate properly. It could cause DEATH,  
SERIOUS BODILY INJURY, AND/OR PROPERTY DAMAGE.  
Examine the location to ensure the water heater complies with the  
“Facts to Consider About the Location” section in this manual.  
5. 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 California Office of the State  
Architect, 400 P Street, Sacramento, CA 95814.  
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  
understand. 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.  
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.  
taBle of contents  
SAFE INSTALLATION, USE AND SERVICE................................................................................................................................................................ ꢁ  
GENERAL SAFETY...................................................................................................................................................................................................... 3  
INTRODUCTION.......................................................................................................................................................................................................... 4  
Preparing for the Installation ................................................................................................................................................................................ 4  
TABLE OF CONTENTS................................................................................................................................................................................................ 4  
TYPICAL INSTALLATION............................................................................................................................................................................................. 5  
MIXING VALVE USAGE............................................................................................................................................................................................... 5  
LOCATING THE NEW WATER HEATER..................................................................................................................................................................... 6  
Facts to Consider About Location ........................................................................................................................................................................ 6  
Insulation Blankets ............................................................................................................................................................................................... 6  
IMPORTANT SAFETY INSTRUCTIONS...................................................................................................................................................................... 6  
INSTALLING THE NEW WATER HEATER .................................................................................................................................................................. 7  
Mounting............................................................................................................................................................................................................... 7  
Water Piping......................................................................................................................................................................................................7-8  
Water Piping Pressure Test.................................................................................................................................................................................. 8  
Temperature-Pressure Relief Valve...................................................................................................................................................................8-9  
Filling the Water Heater........................................................................................................................................................................................ 9  
WIRING DIAGRAM .................................................................................................................................................................................................... ꢀ0  
WIRING .......................................................................................................................................................................................................................ꢀꢀ  
TEMPERATURE REGULATION ................................................................................................................................................................................ ꢀꢁ  
Temperature Adjustment .................................................................................................................................................................................... ꢀꢁ  
FOR YOUR INFORMATION....................................................................................................................................................................................... ꢀ3  
Thermal Expansion ............................................................................................................................................................................................ ꢀ3  
Strange Sounds.................................................................................................................................................................................................. ꢀ3  
Operational Conditions....................................................................................................................................................................................... ꢀ3  
Water Odor......................................................................................................................................................................................................... ꢀ3  
“Air” in Hot Water Faucets.................................................................................................................................................................................. ꢀ3  
High Water Temperature Shut Off System ......................................................................................................................................................... ꢀ3  
PERIODIC MAINTENANCE....................................................................................................................................................................................... ꢀ4  
Anode Rod Inspection........................................................................................................................................................................................ ꢀ4  
Temperature-Pressure Relief Valve Operation................................................................................................................................................... ꢀ4  
Draining.............................................................................................................................................................................................................. ꢀ4  
Removing Front Panel...................................................................................................................................................................................4-ꢀ5  
Thermostat Removal/Replacement.................................................................................................................................................................... ꢀ5  
Element Cleaning/Replacement....................................................................................................................................................................15-16  
High Limit Switch Removal and Replacement ................................................................................................................................................... 16  
Service ............................................................................................................................................................................................................... 16  
LEAKAGE CHECKPOINTS........................................................................................................................................................................................ ꢀ7  
TROUBLESHOOTING GUIDELINES......................................................................................................................................................................... ꢀ8  
REPAIR PARTS LIST................................................................................................................................................................................................. 19  
4
tYpical installation  
fiGure 1.  
miXinG valve usaGe  
fiGure 2.  
HOTTER WATER CAN SCALD:  
water (potable) heating: All models are considered suitable for  
water (potable) heating only.  
Water heaters are intended to produce hot water. Water heated to a  
temperature which will satisfy space heating, clothes washing, dish  
washing, and other sanitizing needs can scald and permanently injure  
you upon contact. Some people are more likely to be permanently  
injured by hot water than others. These include the elderly, children,  
the infirm, or physically/mentally disabled. If anyone using hot water in  
your home fits into one of these groups or if there is a local code or state  
law requiring a certain temperature water at the hot water tap, then you  
must take special precautions. In addition to using the lowest possible  
temperature setting that satisfies your hot water needs, a means such  
as a mixing valve, should be used at the hot water taps used by these  
peopleoratthewaterheater. Mixingvalvesareavailablefromyourlocal  
plumbing contractor. Consult a Qualified Installer or Service Agency.  
Follow mixing valve manufacturer’s instructions for installation of the  
valves. Before changing the factory setting on the thermostat, read the  
Temperature Regulation” section in this manual.  
5