AO Smith Water Heater 6 119 User Manual

Instruction Manual  
RESIDENTIAL ELECTRIC  
WATER HEATERS  
MODELS 6-120  
FOR POTABLE WATER  
HEATING ONLY  
NOT SUITABLE FOR  
SPACE HEATING  
LISTED  
GAMA certification applies to all  
residential electric water heaters with  
capacities of 20 to 120 gallons. Input  
rating of 12 Kw or less.  
ALLTECHNICALAND WARRANTY QUESTIONS: SHOULD BE DIRECTEDTOTHE LOCALDEALER FROM WHOM THE WATER HEATER WAS  
PURCHASED. IF YOUARE UNSUCCESSFUL, PLEASE WRITE TO THE COMPANY LISTED ON THE RATING PLATE ON THE WATER HEATER.  
KEEP THIS MANUAL IN THE POCKET ON HEATER FOR FUTURE REFERENCE  
WHEN EVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED.  
PRINTED IN THE U.S.A 0207  
PART NO. 185762-000  
SUPERSEDES PART NO. 184639-002  
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.  
DANGER indicates an imminently  
DANGER  
hazardous situation which, if not avoided,  
could result in death or injury.  
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  
CAUTION used without the safety alert  
symbol indicates a potentially hazardous  
situation which, if not avoided, could result  
in property damage.  
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.  
2
GENERAL SAFETY  
3
INTRODUCTION  
Thank You for purchasing this water heater. Properly installed and  
maintained, it should give you years of trouble free service.  
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.  
Abbreviations Found In This Instruction Manual:  
ANSI - American National Standards Institute  
ASME - American Society of Mechanical Engineers  
GAMA - Gas Appliance Manufacturers Association  
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 ConsiderAbout 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 ............................................................................................................................................................ 2  
GENERAL SAFETY ..................................................................................................................................................................................................... 3  
INTRODUCTION .......................................................................................................................................................................................................... 4  
Preparing for the New Installation ..................................................................................................................................................................... 4  
TABLE OF CONTENTS ............................................................................................................................................................................................... 4  
TYPICAL INSTALLATION ........................................................................................................................................................................................... 5  
MIXING VALVE USAGE .............................................................................................................................................................................................. 6  
LOCATING THE NEW WATER HEATER ............................................................................................................................................................... 6-7  
Facts to Consider About Location ..................................................................................................................................................................... 6  
Insulation Blankets .............................................................................................................................................................................................. 7  
INSTALLING THE NEW WATER HEATER ............................................................................................................................................................... 7  
Water Piping ......................................................................................................................................................................................................... 7  
Temperature-Pressure Relief Valve ................................................................................................................................................................... 9  
Filling the Water Heater .................................................................................................................................................................................... 10  
T & P Valve and Pipe Insulation (Selected Models) ...................................................................................................................................... 10  
WIRING DIAGRAMS ................................................................................................................................................................................................. 11  
WIRING ....................................................................................................................................................................................................................... 12  
TEMPERATURE REGULATION ............................................................................................................................................................................... 13  
Temperature Adjustment ................................................................................................................................................................................... 13  
FOR YOUR INFORMATION ..................................................................................................................................................................................... 14  
Thermal Expansion ............................................................................................................................................................................................ 14  
Strange Sounds ................................................................................................................................................................................................. 14  
Operational Conditions ..................................................................................................................................................................................... 14  
Water Odor ......................................................................................................................................................................................................... 14  
“Air” in Hot Water Faucets ................................................................................................................................................................................ 14  
High Water Temperature Shut Off System ..................................................................................................................................................... 14  
PERIODIC MAINTENANCE ...................................................................................................................................................................................... 15  
Anode Rod Inspection ....................................................................................................................................................................................... 15  
Temperature-Pressure Relief Valve Operation............................................................................................................................................... 15  
Draining............................................................................................................................................................................................................... 15  
Thermostat Removal/Replacement ............................................................................................................................................................15-16  
Element Cleaning/Replacement .................................................................................................................................................................16-18  
Drain Valve Washer Replacement ................................................................................................................................................................... 18  
Service ................................................................................................................................................................................................................ 18  
LEAKAGE CHECKPOINTS....................................................................................................................................................................................... 19  
TROUBLESHOOTING GUIDELINES ...................................................................................................................................................................... 20  
REPAIR PARTS LIST ...........................................................................................................................................................................................21-23  
4
TYPICAL INSTALLATION  
COMPACTS  
UPRIGHTS/LOWBOYS  
ELECTRICAL CONNECTIONS MAYBE LOCATED ON THE TOP OR  
SIDE, REFER TO YOUR UNIT. ACTUAL MODEL AND  
ILLUSTRATION MAY VARY DEPENDENT ON MODEL CAPACITY  
AND TYPE. SOME MODELS HAVE ALTERNATE INLET, OUTLET  
AND T&P VALVE LOCATIONS. THESE ALTERNATE LOCATIONS  
ARE IDENTIFIED BY THE LABELING ON THE UNIT.  
TABLE TOPS  
INSTALL THERMAL EXPANSION TANK OR DEVICE IF WATER  
HEATER IS INSTALLED IN A CLOSED WATER SYSTEM.  
INSTALL SUITABLE DRAIN PANS UNDER HEATERS TO PREVENT  
DAMAGE DUE TO LEAKAGE. REFER TO WATER HEATER  
LOCATION, SEE “INSTALLING THE NEW WATER HEATER”  
SECTION.  
INSTALL VACUUM RELIEF IN COLD WATER INLET LINE AS  
REQUIRED BY LOCAL CODES.  
FIGURE 1.  
5