A.O. Smith WATER HEATERS Instruction Manual
Contents
1. Before removing any access panels or servicing the water heater make sure the electrical supply to the water heater is turned OFF Failure to do this could result in death serious bodily injury or property damage Key No Part Description 1 Upper Heating Element If Dual Element Unit 2 Lower Heating Element 3 Element Gasket 4 Lower Thermostat If Dual Element Unit _ 5 Upper Thermostat wiECO Dual Element Unit 6 Lower Thermostat If Single Element Unit 9 Drainvave S 10 Drain Valve Washer 12 Anode Outlet Heat Trap f Applicable 19 Temperature Pressure Relief Valve __ 14 External Heat Trap Nipples If Applicable __ 15 Pipe insulation if Applicable T amp P Insulation If Applicable Drain Pan w Side Drain Instruction Manual Not Illustrated Now that you have purchased this water heater should a need ever exist for repair parts or service simply contact the company it was purchased from or the manufacturer listed on the rating plate on the water heater Be sure to provide all pertinent facts when you call or visit Selling prices will be furnished on request or parts will be shipped at prevailing prices and you will be billed accordingly The model number of your Water Heater will be found on the rating place located above or adjacent to outer door DRAIN PAN WHEN ORDERING REPAIR PARTS ALWAYS GIVE THE FOLLOWING2. A O Smith Instruction Manual Water Heaters RESIDENTIAL ELECTRIC WATER HEATERS FOR POTABLE WATER HEATING ONLY NOT SUITABLE FOR SPACE HEATING EFFICIENCY RATING CERTIFIED ama GAMA certification applies to all residential electric water heaters with capacities of 20 to 120 gallons Input rating of 12 Kw or less LISTED AWARNING Read and understand instruction manual and safety messages before installing operating or servicing this water heater Failure to follow instructions and safety messages could result in death or serious injury Instruction manual must remain with water heater ALL TECHNICAL AND WARRANTY QUESTIONS SHOULD BE DIRECTED TO THE LOCAL DEALER FROM WHOM THE WATER HEATER WAS PURCHASED IF YOU ARE 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 1203 PART NO 184639 000 A e AWAD a 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 mess
3. amp TO SUITABLE DRAIN DRAIN VALVE FIGURE 3 Water Potable Heating All models are considered suitable for water potable heating only ADANGER 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 valves are available Read instruction manual for safe temperature setting HOTTER WATER CAN SCALD Water heaters are intended to produce hot water Water heated to a temperature which will satisfy soace 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 handicapped 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 shall be used at the hot water taps used by these people or at the water heater Mixing valves are available local plumbing contractor Consult a Qualified Installer or Service Ag
4. avoided a suitable drain pan should be installed under the water heater Drain pans are available from your local plumbing contractor Such a drain pan must have a minimum length and width of at least 2 inches 51 mm greater that the water heater dimensions and must be piped to an adequate drain Also the water heater must be located and or protected so it is not subject to physical damage by a moving vehicle INSULATION BLANKETS Insulation blankets are available to the general public for external use on electric water heaters but are not necessary with this product The purpose of an insulation blanket is to reduce the standby heat loss encountered with storage tank heaters Your water heater meets or exceeds the National Appliance Energy Conversation Act standards with respect to insulation and standby loss requirements making an insulation blanket unnecessary Should you choose to apply an insulation blanket to this heater you should follow these instructions below Failure to follow these instructions can result in fire serious personal injury or death Donotcoverthe temperature and pressure relief T amp P valve with an insulation blanket Do not cover the instruction manual Keep it on the side of the water heater or nearby for future reference e Do obtain new warning and instruction labels for placement on the blanket directly over the existing labels WATER PIPING ADANGER Water temperature over 125
5. cleaning and sanitizing bodies dishes clothing Untempered hot water can present a scald hazard Depending on the time element and the people involved adults children elderly infirm etc scalding may occur at different temperatures ADANGER 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 valves are available Read instruction manual for safe temperature setting HOTTER WATER CAN SCALD 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 handicapped 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 shall be used at the hot water taps used by these people or at the water heater Mixing valves are availa
6. state If any provision of this warranty is prohibited or invalid under applicable state law that provision shall be ineffective to the extent of the prohibition or invalidity without invalidating the remainder of the affected provision or the other provisions of this warranty SERVICE AND LABOR RESPONSIBILITY UNDER THIS LIMITED WARRANTY THE WARRANTOR WILL PROVIDE ONLY A REPLACEMENT WATER HEATER OR PART THEREOF THE OWNER IS RESPONSIBLE FOR ALL OTHER COSTS Such costs may include but are not limited to a Labor charges for service removal or reinstallation of the water heater or part thereof b Shipping and delivery charges for forwarding the new water heater or replacement part from the nearest distributor and returning the claimed defective heater or part to such distributor C All cost necessary or incidental for handling and administrative charges and for any materials and or permits required for installation of the replacement heater or part LIMITATION ON IMPLIED WARRANTIES Implied warranties including any warranty of merchan tability imposed on the sale of this heater under state law are limited to one year duration for the heater or any of its parts Some states do not allow limitations on how long an implied warranty lasts so the above limitations may not apply to you CLAIM PROCEDURE Any claim under this warranty should be initiated with the dealer who sold the heater or with any other dealer handling
7. INFORMATION e MODEL NUMBER e SERIAL NUMBER PART DESCRIPTION THIS IS A REPAIR PARTS LIST NOT APACKING LIST A O Smith Water Heaters www aosmithwaterheaters com 15 4 4 These guidelines should be utilized by a qualified service agent Problem Solution WATER LEAKS Improperly sealed hot or cold supply connection Tighten threaded connections See Leakage Checkpoints on 14 relief valve or drain valve Leakage from other appliances or water lines Inspect other appliances near water heater LEAKING TEMPERATURE Thermal expansion in closed water system Install thermal expansion tank AND PRESSURE DO NOT plug T amp P valve RELIEF VALVE Improperly seated valve Check relief valve for proper operation DO NOT plug T amp P valve HOT WATER ODORS High sulfate or mineral content in water supply Drain and flush heater thoroughly then refill CAUTION UNAUTHORIZED REMOVAL OF THE ANODE S WILL VOID THE WARRANTY FOR Bacteria in water supply Chlorinate water supply FURTHER INFORMATION CONTACT YOUR DEALER NOT ENOUGH Power supply to heater is not on Turn disconnect switch on or contact OR electrician NO HOT WATER Thermostat set too low Heater undersized Incoming water is usually cold Winter Leaking hot water from pipes or fixtures High temperature limit switch activated Contact dealer to determine cause See temperature regulation HOT WATER TOO HOT Thermostat set too high Refer to
8. OPENING MAY BE ON SIDE OR TOP OF HEATER SEE INSTALLATION INSTRUCTIONS DRAIN LINE ACCESS PANELS o AIR GAP FLOOR DRAIN 4 DRAIN VALVE INSTALL SUITABLE DRAIN PANS UNDER HEATERS TO PREVENT DAMAGE DUE TO LEAKAGE REFER TO WATER HEATER LOCATION ON PAGE 8 INSTALL VACUUM RELIEF IN COLD WATER INLET LINE AS REQUIRED BY LOCAL CODES INSTALL THERMAL EXPANSION TANK OR DEVICE IF WATER HEATER IS INSTALLED IN A CLOSED WATER SYSTEM FIGURE 1 5 3 4 THREADED CONNECTION T amp P RELIEF VALVE EMBLEM AND RATING PLATE DRAIN LINE THERMOSTAT AND ELEMENT ACCESS PANEL COMPACTS ALT HOT WATER OUTLET TFUSED ELECTRICAL SUPPLY tt ON OFF SWITCH COLD WATER LET SHUTOFF 6 AIR se ec FLOOR DRAIN t t MODEL ELJF 10 ONLY TABLE TOPS TFUSED ELECTRICAL SUPPLY HOT WATER UNION SUPPLY PIPE TEMPERATURE AND PRESSURE HELIEF VALVE FACTORY INSTALLED EMBLEM AND RATING PLATE DRAIN LINE PIPED TO OPEN DRAIN NOT FACTORY INSTALLED UPPER Be ELEMENT A D LOWER THERMOSTAT AND ELEMENT ACCESS PANEL Oo ON RIGHT OR LEFT l DRAIN VALVE A WARNING Before removing any access panels or servicing the water heater make sure the electrical supply to the water heater is turned OFF Failure to do this could result in death serious bodily injury or property damage TURN OFF THE HEATER ELECTRICAL SUP
9. TB D G Condensation dripping may be seen on pipes if the water temperature is low in humid weather or pipe connections may be leaking The anode rod fitting may be leaking emall amounts of water from temperature pressure relief valve may be due to thermal expansion or high water pressure in your area If the valve is not piped to an open drain the released water could be mistaken for a leaking heater The temperature pressure relief valve may be leaking at the tank fitting Water on the side of the tank may be condensation due to the panel or insulation not being in place Water from a drain valve may be due to the valve being slightly opened The drain valve may be leaking at the tank fitting Water in the water heater bottom or on the floor may be from condensation loose connections or the relief valve DO NOT replace the water heater until a full inspection of all possible water sources is made and necessary corrective steps taken Leakage from other appliances water lines or ground seepage should also be checked To check where threaded portion enters tank insert cotton swab between jacket opening and fitting If cotton is wet follow Draining instructions in the Periodic Maintenance section and then remove fitting Put pipe dope or teflon tape on the threads and replace Then follow Filling the Water Heater instructions in the Installing the New Water Heater section AWARNING
10. location e in the United States its territories or possessions and Canada Sized in accordance with proper sizing techniques for residential water heaters bearing a rating plate which has not been altered defaced or removed except as required by the warrantor Used in an open system or in a closed system with a properly sized and installed thermal expansion tank e connected to the proper voltage or Operated at the factory rated input installed with no attempted nor actual modification or alteration of the water heater s design in any way including but not limited to the attachment of non company approved appliances or equipment Any accident to the water heater or any part thereof including freezing fire floods or lightning any misuse abuse or alteration of it any operation of it in a modified form any operation of the water heater on desalinated deionized water or any damage caused by attempts to repair tank leaks or parts will void this warranty This warranty does not cover water heaters replaced for cosmetic reasons or for reasons of noise taste odor discolored and or rusty water This warranty does not apply to water heaters used to heat pools whirlpools or hot tubs or used for space heating where its sizing does not conform with specifications of the heating component manufacturer This warranty gives you specific legal rights and you may have other rights which vary under the laws of each
11. the manufacturer whose name appears on the rating plate Carefully plan the place where you are going to put the water heater INSTALLATION OR SERVICE OF THIS WATER HEATER REQUIRES ABILITY EQUIVALENT TO THAT OF ALICENSED TRADESMAN IN THEFIELD INVOLVED PLUMBING AND ELECTRICAL WORK ARE REQUIRED Examine the location to ensure the water heater complies with the Facts to Consider About the Location section in this manual 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 Massachusetts Code requires this water heater to be installed in accordance with Massachusetts 248 CMR 2 00 State Plumbing Code and 248 CMH 5 00 LOWBOYS COLD WATER INLET LINE 3 4 THREADED CONNECTION HOT WATER SUPPLY LINE EMBLEM AND RATING PLATE SUPPLY AND PRESSURE RELIEF VALVE FACTORY INSTALLED ELEMENT ACCESS PANEL 9 AIR GAP t OPEN DRAIN CORAN VALVE UPRIGHTS t FUSED ELECTRICAL SUPPLY COLD WATER INLET LINE HOT WATER SHUTOFF VALVE SUPPLY PIPE UNION y ES 3 4 THREADED ELECTRICAL CONNECTION JUNCTION s RET o ADJACENT CONDUIT TEMPERATURE AND EMBLEM ENTRANCE AME ER PRESSURE RELIEF RATING PLATE VALVE
12. the structural floor Be certain that no contact is made with any live electrical part The discharge opening must not be blocked or reduced in size under any circumstances Excessive length over 30 feet 9 14 m or use of more than four elbows can cause restriction and reduce the discharge capacity of the valve No valve or other obstruction is to be placed between the relief valve and the tank Do not connect tubing directly to discharge drain unless inch air gap is provided To prevent bodily injury hazard to life or property damage the relief valve must be allowed to discharge water in quantities should circumstances demand If the discharge pipe is not connected to a drain or other suitable means the water flow may cause property damage CAUTION Jemperature pressure relief valve discharge pipe must terminate at adequate drain The Discharge Pipe e Shall not be smaller in size than the outlet pipe size of the valve or have any reducing couplings or other restrictions e Shall not be plugged or blocked Shall be of material listed for hot water distribution e Shall be installed so as to allow complete drainage of both the temperature pressure relief valve and the discharge pipe e Shall terminate at an adequate drain e Shall not have any valve between the relief valve and tank ADANGER Water temperature over 125 F 52 C can cause severe burns instantly resulting in severe injury or death Chil
13. water can cause L are at highest riskfor scald injury watertank explosion Feel water before bathing or Properly sized temperature and pressure relief valve must b Temperature limiting valves are be installed in opening available provided Read instruction manual for safe temperature setting A WARNING Before removing any access panels or servicing the water heater make sure the electrical supply to the water heater is turned OFF Failure to do this could result in death serious bodily injury or property damage AL SAFE INSTALLATION USE AND SERVICE 2 Temperature 11 GENERAL SAFETY 3 FOR YOUR INFORMATION 12 TABLE OP CONTENTS Thermal Expansion ee stent cacuaesniatunnenonsoedundenitateduesttteacs 12 INTRO DIC TION asm RR E 4 Stange ONG Step nesinsvccountss codec etsduadinlsia sgoustirenduidciatenndin 12 Preparing for the New Installation 4 Operational Conditions E Rush EN P xc OPEM EK 12 j PIT Hr o PH 4 Snell nada decisa den 12 TYPICAL INSTALLATION eeeeeeeneennnnnn nnn 5 Air in Hot Water 1
14. 2 WIRING DIAGRAMS 6 High Water Temperature Shut Off System 12 MIXING VALVE USAGE 7 PERIODIC MAINTENANCE 12 LOCATING THE NEW WATER HEATER 8 Anode Rod Inspection 12 13 Facts to Consider About Location 8 Temperature Pressure Relief Valve Operation 13 Insulation Blankets 8 COANE MT T 18 INSTALLING THE NEW WATER HEATER 8 Drain Valve Washer Replacement 13 Water 8 9 E OE 13 Temperature Pressure Relief Valve 9 10 LEAKAGE CHECKPOINTS eese 14 Filling the Water Heater 10 REPAIR PARTS LIST i esosseciseue patate ce 15 T amp P Valve and Pipe Insulation Selected Models 10 ues 1p ce Ec 16 TEMPERATURE REGULATION 11 WARRANTY mmm nemen rene Insert NIRMUL oji Thank You for purchasing this water heater Properly installed and 2 The installation must conform with these instructions and the local maintained it should give you y
15. BE LIABLE BY VIRTUE OF THIS WARRANTY OR OTHERWISE FOR DAMAGE TO ANY PERSONS OR PROPERTY WHETHER DIRECT OR INDIRECT AND WHETHER ARISING IN CONTRACT OR IN TORT Should governmental regulations or industry standards prohibit the Manufacturer from furnishing a comparable model replacement under this warranty the Owner will be furnished with the closest comparable water heater meeting the then current governmental regulations and industry standards A supplementary fee may be assessed to cover the additional cost associated with the changes made to meet applicable regulations and standards IMPORTANT INFORMATION Model Number Serial Number INSTALLATION INFORMATION Date Installed Company s Name Street or P O Box City State and Zip Code Phone Number Plumber s Name A O Smith Water Heaters www aosmithwaterheaters com A O Smith Water Heaters www aosmithwaterheaters com
16. ETTING ANODE ROD INSPECTION CAUTION Avoid water heater damage Inspection and replacement of anode rod required The anode rod is used to protect the tank from corrosion Most hot water tanks are equipped with an anode rod The submerged rod sacrifices itself to protect the tank Instead of corroding the tank water ions attack and eat away the anode rod This does not affect the water s taste or color The rod must be maintained to keep the tank in operating condition Anode deterioration depends on water conductivity not necessarily water condition A corroded or pitted anode rod indicates high water conductivity and should be checked and or replaced more often then an anode rod that appears to be intact Replacement of a depleted anode rod can extend the life of your water heater Inspection should be conducted by a qualified technician and at a minimum should be checked annually after the warranty period TEMPERATURE PRESSURE RELIEF VALVE OPERATION ADANGER Burn hazard Hot water discharge Keep clear of relief valve discharge outlet The temperature pressure relief valve must be manually operated at least once a year When checking the temperature pressure relief valve operation make sure that 1 no one is in front of or around the outlet of the temperature pressure relief valve discharge line and 2 that the water discharge will not cause any property damage as the water may be extremely h
17. 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 valves are available Read instruction manual for safe temperature setting HOTTER WATER CAN SCALD Water heaters are intended to produce hot water Water heated to a temperature which will satisfy soace heating clothes washing dish washing cleaning 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 handicapped 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 shall be used at the hot water V VV A Q3 HEAITLP taps used by these people or at the water heater Valves for reducing point of use temperature by mixing cold and hot water are also available Consult a Qualified Installer or Service Agency Follow manufacturer s instructions for installation of the valves Before changing the factory setting on the thermostat read
18. PLY BEFORE SERVICING ANY ELECTRICAL COMPONENTS C 2 A 9 TWO WIRE CIRCUIT FOR SINGLE 240 VOLT OFF PEAK NON SIMULTANEOUS ELEMENT HEATERS EQUIPPED OPERATION BOTTOM ELEMENT ON SEPARATE WITH HIGH LIMIT CONTROL TIME CLOCK OR OFF PEAK METER TIME CLOCK SWITCH OFF PEAK METER OPERATES BOTTON ELEMENT ONLY OPERATES BOTTON ELEMENT ONLY S 1 TO POWER TO TIME CLOCK TO POWER TO OFF PEAK RED t SUPPLY SWITCH SUPPLY METER THREE WIRE CIRCUIT FOR L1 L2 L2 L2 Li 121113 ELECTRIC CO CO OP HIGH JUNCTION JUNCTION PROGRAMS LIMIT BOX BOX YELLOW BLACK YELLOW BLUE BLACK HEATER SINGLE JUNCTION BOX THROW THERMOSTAT RED T REDT BLACK HIGH ELEMENT LIMIT T WHITE FOR 120V AND 277V DOUBLE THRO THERMOSTAT A 6 s TWO WIRE CIRCUIT FOR NON SIMULTANEOUS OPERATION HAS SINGLE HIGH LIMIT CONTROL JUNCTION BOX f BLUE BLACK BLUE ELEMENT ELEMENT 2 BLACK MUST NOT BE CONVERTED ELEMENT TO SIMULTANEOUS OPERATION SINGLE WHITE FOR 120V AND 277V THROW THERMOSTAT RED BLACK n ELEMENT FIGURE 2 6 SHUT OFF VALVE NON SCALD TEMPERING VALVE SUGGESTED PIPING ARRANGEMENT FOR TOP CONNECTIONS NON TEMPERED WATER SUPPLY DRAIN PAN o F COLD WATER INLET 5 TEMPERED POTABLE WATER E NON TEMPERED WATER RETURN TEMPERATURE PRESSURE QOS RELIEF VALVE DISCHARGE PIPE DO NOT CAP OR PLUG D SLS TS
19. adequate drain 6 Close the drain valve 7 Follow the instructions in the Filling the Water Heater section DRAIN VALVE WASHER REPLACEMENT See Figure 9 1 Follow Draining instructions 2 Turning counter clockwise x remove the hex cap below the screw handle 3 Remove the washer and put the new one in place 4 Screw the handle and cap assembly back into the drain valve and retighten using a wrench DO NOT OVER TIGHTEN 5 Follow instructions in the Filing The Water Heater section 6 Checkfor leaks FIGURE 9 SERVICE If a condition persists or you are uncertain about the operation of the water heater contact a service agency Use this guide to check a Leaking water heater Many suspected Leakers are not leaking tanks Often the source of the water can be found and corrected If you are not thoroughly familiar with your water heater and safety practices contact a qualified installer to check the water heater AWARNING Read and understand instruction manual and safety messages before installing operating or servicing this water heater Failure to follow instructions and safety messages could result in death or serious injury Instruction Manual must remain with water heater 14 AP OILIN Read this manual first Then before checking the water heater make sure the electrical power supply has been turned OFF before checking the tank for leakage A
20. age 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 A DANGER hazardous situation which if not avoided could result in death or injury WARNING indicates a potentially hazardous A iR MDC situation which if not avoided could result in death or injury CAUTION indicates a potentially hazardous A situation which if not avoided may result in minor or moderate injury CAUTION used without the safety alert symbol indicates a potentially hazardous CAUTION 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 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 mu
21. ater has been used for other than single family residential application 1 The tank warranty shall be reduced to 1 year for 6 year models and to 3 years for 10 year models 2 The parts warranty shall be reduced to 1 year for all models CONDITIONS AND EXCEPTIONS This warranty shall apply only when the water heater is installed and operated in accordance with 1 all local fire codes and plumbing codes ordinances and regulations 2 the printed instructions provided with it 3 good industry practices and 4 proper safety practices such as but not limited to a properly sized drain pan if installed in an area where leakage from the tank or its connections would result in damage to the area adjacent to the heater In addition a new temperature and pressure relief valve certified by the Canadian Gas Association must have been properly installed and piped to the nearest drain This warranty shall apply only when the heater is e owned by the original purchaser e installed for indoor operation only used at temperatures not exceeding the maximum calibrated setting of its thermostat Used at water pressure not exceeding the working pressure shown on the heater e filled with potable water free to circulate at all times and with the tank free of damaging water sediment or scale deposits Used in a non corrosive and non contaminated atmosphere used with factory approved anode s installed e in its original installation
22. ble from your local plumbing contractor Follow manufacturer s instructions for installation of the valves Before changing the factory setting on the thermostat read the Temperature Regulation section in this manual THIS WATER HEATER IS EQUIPPED WITH AN ADJUSTABLE THERMOSTAT TO CONTROL WATER TEMPERATURE HOT WATER TEMPERATURES DESIRED FOR AUTOMATIC DISHWASHER AND LAUNDRY USE CAN CAUSE SCALDS RESULTING IN SERIOUS PERSONAL INJURY AND OR DEATH THE TEMPERATURE AT WHICH INJURY OCCURS VARIES WITH THE PERSON S AGE AND THE TIME OF THE EXPOSURE THE SLOWER RESPONSE TIME OF CHILDREN AGED OR DISABLED PERSONS INCREASES THE HAZARDS TO THEM NEVER ALLOW SMALL CHILDREN TO USEAHOT WATER TAP OR TO DRAW THEIR OWN BATH WATER NEVER LEAVE A CHILD OR DISABLED PERSON UNATTENDED INABATHTUB OR SHOWER Itis recommended that lower water temperatures be used to avoid the risk of scalding It is further recommended in all cases that the water temperature thermostat See Figure 3 be set for the lowest temperature which satisfies your hot water needs This will also provide the most energy efficient operation of the water heater Thermostat s are factory set at 120 F 49 C unless specified differently by state requirements A 4 9 KEEPING THE THERMOSTAT SETTINGAT 120 WILL REDUCE THE RISK OF SCALDS Figure 7 shows the approximate time to burn relationship for normal adult skin The thermostats on your water heater have a linear relat
23. cet before turning ON electrical supply to the water heater To fill the water heater with water 1 Close the water heater drain valve by turning the handle to the right clockwise The drain valve is on the lower front of the water heater 2 Open the cold water supply valve to the water heater NOTE The cold water supply valve must be left open when the water heater is in use To insure complete filling of the tank allow air to exit by opening the nearest hot water faucet Allow water to run until a constant flow is obtained This will let air out of the water heater and the piping 4 Check all water piping and connections for leaks Repair as needed PIPE INSULATION FIGURE 6 T amp P VALVE and PIPE INSULATION On Selected Models Remove insulation for T amp P Valve and pipe connections from carton Fit pipe insulation over the incoming cold water line and the hot water line Make sure that the insulation is against the top cover of the heater Fit T amp P Valve insulation over valve Make sure that the insulation does not interfere with the lever or outlet of the T amp P valve Secure all insulation using tape D D V 32 n Due to the nature of the typical water heater the water temperature in certain situations may vary up to 30 F 16 7 C higher or lower at the point of use such as bathtubs showers sink etc Any water heater s intended purpose is to heat water Hot water is needed for cleansing
24. de e Properly sized temperature relief valve must be installed in opening provided e Can result in overheating and excessive tank pressure Can cause serious injury or death This heater is provided with a properly certified combination temperature pressure relief valve by the manufacturer The valve is certified by a nationally recognized testing laboratory that maintains periodic inspection of production of listed equipment of materials as meeting the requirements for Relief Valves and Automatic Gas Shut off Devices for Hot Water Supply Systems ANSI 421 22 CSA 4 4 and the code requirements of ASME If replaced the valve must meet the requirements of local codes but not less than a combination temperature and pressure relief valve certified as indicated in the above paragraph The valve must be marked with a maximum set pressure not to exceed the marked hydrostatic working pressure of the water heater 150 psi 1 035 kPa and a discharge capacity not less than the water heater input rate as shown on the model rating plate For safe operation of the water heater the relief valve must not be removed from its designated opening nor plugged The temperature pressure relief valve must be installed directly into the fitting of the water heater designed for the relief valve Position the valve downward and provide tubing so that any discharge will exit only within 6 inches 153 mm above or at any distance below
25. dren the elderly and the physically or mentally disabled are at highest risk for scald injury Feel water before bathing or showering Temperature limiting valves are available Read instruction manual for safe temperature setting The temperature pressure relief valve must be manually operated at least once a year Caution should be taken to ensure that 1 no one is in front of or around the outlet of the temperature pressure relief valve discharge line and 2 the water manually discharged will not cause any bodily injury or property damage because the water may be extremely hot OPTIONAL TOP T amp P LOCATION 2 4 SHUT OFF VALVE lt T COLD EH UNION i UNION 1 TEMPERATURE PRESSURE RELIEF VALVE OPTIONAL TOP T amp P RELIEF VALVE NOT SHOWN DISCHARGE PIPE DO NOT CAP OR PLUG FIGURE 5 If after manually operating the valve it fails to completely reset and continues to release water immediately close the cold water inlet to the water heater follow the draining instructions and replace the temperature pressure relief valve with a new one FILLING THE WATER HEATER CAUTION Avoid water heater damage Fill tank with water before operating Never use this water heater unless it is completely full of water To prevent damage to the tank the tank must be filled with water Water must flow from the hot water fau
26. e considered to eliminate the water problem Do not remove the anode leaving the tank unprotected By doing so all warranty on the water heater tank is voided AIR INHOT WATER FAUCETS A WARNING Flammable hydrogen gases may be present Keep all ignition sources away from faucet when turning on hot water HYDROGEN GAS Hydrogen gas can be produced in a hot water system that has not been used for a long period of time generally two weeks or more Hydrogen gas is extremely flammable and explosive To prevent the possibility of injury under these conditions we recommend the hot water faucet located farthest away be opened for several minutes before any electrical appliances which are connected to the hot water system are used such as a dishwasher or washing machine If hydrogen gas is present there will probably be an unusual sound similar to air escaping through the pipe as the hot water faucet is opened There must be no smoking or open flame near the faucet at the time it is open HIGH WATER TEMPERATURE SHUT OFF SYSTEM A non adjustable high temperature limit control operates before steam temperatures are reached The high limit is in the same area as the upper thermostat and must be reset manually when it operates BECAUSE THE HIGH LIMIT OPERATES ONLY WHEN ABNORMALLY HIGH WATER TEMPERATURES ARE PRESENT IT ISIMPORTANT THATAQUALIFIED SERVICE AGENT BE CONTACTED TODETERMINE THE REASON FOR OPERATION BEFORE RES
27. ears 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 Electric Code NFPA National Fire Protection Association UL Underwriters Laboratory 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 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 Since we cannot put everything on the first few pages READ THE ENTIRE MANUAL BEFORE ATTEMPTING TO INSTALL OR OPERATE THE WATER HEATER code authority having jurisdiction and the requirements of the power company In the absence of code requirements follow NFPA 70 latest edition The National Electric Code which may be ordered from National Fire Protection Association 1 Batterymarch Park Quincy MA 02269 If after reading this manual you have any questions or do not understand any portion of the instructions call the local utility or
28. ency 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 is FACTS TO CONSIDER ABOUT THE LOCATION CAUTION All water heaters eventually leak Donotinstall without adequate drainage Carefully choose an indoor location for the new water heater because the placement is a very important consideration for the safety of the occupants in the building and for the most economical use of the appliance Whether replacing an old water heater or putting the water heater in a new location the following critical points must be observed 1 Selectalocation indoors as close as practical or centralized to the water piping system as possible The water heater should be located in an area not subject to freezing temperatures 2 Selected location must provide adequate clearances 4 for servicing 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 Installation of the water heater must be accomplished in such a manner that if the tank or any connections should leak the flow will not cause Ve a8 DEALER damage to the structure For this reason it is not advisable to install the water heater in an attic or upper floor When such locations cannot be
29. f some metal parts during periods of heat up and cool down do not necessarily represent harmful or dangerous conditions OPERATIONAL CONDITIONS SMELLY WATER In each water heater there is installed at least one anode rod see parts sections for corrosion protection of the tank Certain water conditions will cause a reaction between this rod and the water The most common complaint associated with the anode rod is one of a rotten egg smell in the hot water This odor is derived from hydrogen sulfide gas dissolved in the water The smell is the result of four factors which must all be present for the odor to develop a Aconcentration of sulfate in the supply water b Little or no dissolved oxygen in the water c Asulfate reducing bacteria which has accumulated within the water heater this harmless bacteria is nontoxic to humans d An excess of active hydrogen in the tank This is caused by the corrosion protective action of the anode omelly water may be eliminated or reduced in some water heater models by replacing the anode s with one of less active material and then chlorinating the water heater tank and all hot water lines Contact the local water heater supplier or service agency for further information concerning an Anode Replacement Kit and this chlorination treatment If the smelly water persists after the anode replacement and chlorination treatment we can only suggest that chlorination or aeration of the water supply b
30. if necessary Contact qualified installer or service agency Water supply systems may because of such events as high line pressure frequent cut offs the effects of water hammer among others have installed devices such as pressure reducing valves check valves back flow preventers etc to control these types of problems When these devices are not equipped with an internal by pass and no other measures are taken the devices cause the water system to be closed As water is heated it expands thermal expansion and closed systems do not allow for the expansion of heated water The water within the water heater tank expands as it is heated and increases the pressure of the water system If the relieving point of the water heater s temperature pressure relief valve is reached the valve will relieve the excess pressure The temperature pressure relief valve is not intended for the constant relief of thermal expansion This is an unacceptable condition and must be corrected It is recommended that any devices installed which could create a closed system have a by pass and or the system have an expansion tank or device to relieve the pressure built by thermal expansion in the water system Expansion tanks are available for ordering through a local plumbing contractor Contact the local water heater supplier or service agency for assistance in controlling these situations STRANGE SOUNDS Possible noises due to expansion and contraction o
31. ionship between degrees of angular rotation and the corresponding change in temperature Thus rotating the temperature adjustment indicator 30 angular degrees will result in a 10 degree Fahrenheit change in water temperature TEMPERATURE ADJUSTMENT Before removing any access panels or servicing the water heater make sure the electrical supply to the water heater is turned OFF Failure to do this could result in death serious bodily injury or property damage To change the temperature setting 1 Turn off the heater electrical supply Do not attempt to adjust thermostat with power on 2 Remove the thermostat access panels and covers from the thermostats Do not remove the plastic personnel protectors covering the thermostats Using a flat tip screwdriver rotate the adjustment knob to the desired temperature setting 4 Replace the covers and access panels and turn on heater electrical supply B E i k i m NT a T pd 1 1 1 L 3 i L r o Time to Produce 2nd amp 3rd Degree Burns on Adult Skin About 1 2 second About 1 1 2 seconds Less than 5 seconds About 30 seconds More than 5 minutes Temperature Settings 160 F 71 150 F 66 C 60 130 54 C 120 F 49 C 80 F 27 C 140 60 FIGURE 7 THERMAL EXPANSION CAUTION Avoid water heater damage Install thermal expansion tank or device
32. ot see Figure 8 TEMPERATURE PRESSURE RELIEF VALVE DISCHARGE PIPE FIGURES If after manually operating the valve it fails to completely reset and continues to release water immediately close the cold water inlet to the water heater follow the draining instructions and replace the temperature pressure relief valve with a new one If the temperature pressure relief valve on the appliance weeps or discharges periodically this may be due to thermal expansion You may have a check valve installed in the water line or a water meter with a check valve Consult your local water supplier or service agency for further information Do not plug the temperature pressure relief valve DRAINING ADANGER e Burn hazard Hot water discharge Keep hands clear of drain valve discharge The water heater should be drained if being shut down during freezing temperatures Also periodic draining and cleaning of sediment from the tank may be necessary 1 Turn electrical supply OFF 2 CLOSEthe cold water inlet valve to the water heater OPEN a nearby hot water faucet and leave open to allow for draining 4 Connect a hose to the drain valve and terminate to an adequate drain 5 OPEN the water heater drain valve to allow for tank draining NOTE If the water heater is going to be shut down and drained for an extended period the drain valve should be left open with hose connected allowing water to terminate to an
33. st have a thorough understanding of the water heater Instruction Manual Service Agency Aservice 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 AWARNING CAUTION Read and understand instruction Improper installation and use may result manual and safety messages in property damage before installing operating or servicing this water heater Do not operate water heater if flood damaged Failure to follow instructions and Inspect and replace anode safety messages could result in e Install in location with drainage death or serious injury Fill tank with water before operation Be alert for thermal expansion Instruction manual must remain l with water heater Refer to instruction manual for installation and service Water temperature over 125 F ADANGER 52 C can cause severe burns A WA RN NG instantly resulting in severe injury or death Explosion Hazard Children the elderly and the physically or mentally disabled Overheated
34. sure built by thermal expansion in the water system Expansion tanks are available for ordering through a local plumbing contractor Contact the local water supplier and or a service agency for assistance in controlling these situations NOTE To protect against untimely corrosion of hot and cold water fittings it is strongly recommended that di electric unions or couplings be installed on this water heater when connected to copper pipe CAUTION Avoid water heater damage Install thermal expansion tank if necessary Do not apply heat to cold water inlet Contact qualified installer or service agency Figure 4 shows the typical attachment of the water piping to the water heater The water heater is equipped with 3 4 inch NPT water connections NOTE If using copper tubing solder tubing to an adapter before attaching the adapter to the cold water inlet connection Do not solder the cold water supply line directly to the cold water inlet it will harm the dip tube and damage the tank oa COLD WATER INLET lt _ SHUTOFF VALVE hid E 3 4 SWEAT 3 4 SWEAT FITTINGS P _ lt FITTINGS TEMPERATURE PRESSURE RELIEF VALVE OPTIONAL TOP T amp P RELIEF VALVE NOT SHOWN DISCHARGE PIPE DO NOT CAP OR PLUG 1S FLOOR DRAIN DRAIN VALVE FIGURE A TEMPERATURE PRESSURE RELIEF VALVE A WARNING e Temperature pressure relief valve must comply with ANSI 221 22 andASME co
35. temperature regulation High temperature limit switch activated Contact dealer to determine cause See temperature regulation WATER HEATER SOUNDS Scale accumulation on elements Contact dealer to clean or replace elements Sediment build up on tank bottom Drain and flush heater thoroughly then refill 16 A QO Smith Water Heaters RESIDENTIAL ELECTRIC WARRANTY THIS WARRANTY IS APPLICABLE TO THE ORIGINAL OWNER ONLY In accordance with the warranty terms and conditions specified below A O Smith Water Heaters the warrantor will furnish the ORIGINAL OWNER 1 a replacement A O Smith water heater of equivalent size and current model if the glasslined tank in this water heater leaks and 2 a replacement part for any component part which fails THE A O SMITH WATER HEATERS REPLACEMENT MODEL OR PART WILL BE WARRANTED FOR ONLY THE UNEXPIRED PORTION OF THE ORIGINAL WARRANT Y The warranty period will be determined by the original date of purchase of the water heater or in the absence of a Bill of Sale verifying said date from the date of manufacture indicated on rating plate affixed to this water heater This warranty is not transferrable and applies to models listed below Parts 6 year PCRT PCRS PCS PCL PCJ PLSC ProMax 6 Year Models ECRS ECT ECS ECJ ELJC ESTT ELSC Tank Conservationist PXHT PXHS ProMax 10 Year Models 10 year When the water he
36. the Temperature Regulation section in this manual A WARNING Toxic Chemical Hazard Do not connect to non potable water system This water heater shall not be connected to any heating systems or component s used with a non potable water heating appliance Toxic chemicals such as those used for boiler treatment shall not be introduced into this system Water supply systems may because of such events as high line pressure frequent cut offs the effects of water hammer among others have installed devices such as pressure reducing valves check valves back flow preventers etc to control these types of problems When these devices are not equipped with an internal by pass and no other measures are taken the devices cause the water system to be closed As water is heated it expands thermal expansion and closed systems do not allow for the expansion of heated water The water within the water heater tank expands as it is heated and increases the pressure of the water system If the relieving point of the water heater s temperature pressure relief valve is reached the valve will relieve the excess pressure The temperature pressure relief valve is not intended for the constant relief of thermal expansion This is an unacceptable condition and must be corrected It is recommended that any devices installed which could create a closed system have a by pass and or the system have an expansion tank or device to relieve the pres
37. the warrantor s products If this is not practical the owner should contact A O Smith Corporation 5621 W 115th Street Alsip Illinois 60803 Phone 1 800 323 2636 or visit our website www hotwater com For Canadian customers contact A O Smith Enterprises LTD P O Box 310 768 Erie Street Stratford Ontario N5A6T3 or phone 1 800 265 8520 Replacement Parts may be ordered through authorized servicers or distributors Refer to your local Yellow Pages for where to call or contact A O Smith Corporation 5621 W 115th Street Alsip Illinois 60803 Phone 1 800 433 2545 or visit our website at www hotwater com parts The warrantor will only honor replacement with identical or similar water heater or parts thereof which are manufactured or distributed by the warrantor Dealer replacements are made subject to in warranty validation by warrantor PROOF OF PURCHASE AND PROOF OF INSTALLATION DATE ARE REQUIRED TO SUPPORT WARRANTY CLAIM FROM ORIGINAL OWNER THIS FORM DOES NOT CONSTITUTE PROOF OF PURCHASE OR PROOF OF INSTALLATION DISCLAIMERS NO EXPRESSED WARRANTY HAS BEEN OR WILL BE MADE IN BEHALF OF THE WARRANTOR WITH RESPECT TO THE MERCHANTABILITY OF THE HEATER OR THE INSTALLATION OPERATION REPAIR OR REPLACEMENT OF THE HEATER OR PARTS THE WARRANTOR SHALL NOT BE RESPONSIBLE FOR WATER DAMAGE LOSS OF USE OF THE UNIT INCONVENIENCE LOSS OR DAMAGE TO PERSONAL PROPERTY OR OTHER CONSEQUENTIAL DAMAGE THE WARRANTOR SHALL NOT
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