A.O. Smith Hot Water Generator Technical Documents
Contents
1. 12 12 Sediment Removal 12 13 8 M ka eye 13 TROUBLESHOOTING uuu Susu acetate ee 14 WARRANTY ee 15 NOTES RT 16 19 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 e ANSI American National Standards Institute e ASME American Society of Mechanical Engineers e NEC National Electrical Code e NFPA National Fire Protection Association 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 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 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 General outline diagrams are in this manual These diagrams will serve to provide the installer with a reference for basic installation of this2. heated As the volume of water grows there will be a corresponding increase in water pressure due to thermal expansion Thermal expansion can cause premature tank failure leakage This type of failure is not covered under the limited warranty Thermal expansion can also cause intermittent temperature pressure relief valve operation water discharged from the valve due to excessive pressure build up This condition is not covered under the limited warranty The temperature pressure relief valve is not intended for the constant relief of thermal expansion A properly sized thermal expansion tank should be installed on all closed systems to control the harmful effects of thermal expansion Contact a local plumbing service agency to have a thermal expansion tank installed STEAM SUPPLY STEAM UNITS ONLY This water heater is designed to use saturated steam Superheated steam even small amounts will cause some or all of the following Excessive fouling of the heat exchanger Excessive batch heating times Reduced recovery rate e Reduced steam flow If superheated steam exists in the system a device such as a de superheater must be installed in the steam line supplying this water heater CHECKING FOR TIGHTNESS Threaded and bolted connection can vibrate loose during transit Prior to insulating any of the water heater trim piping or the heat exchanger flange insure that all the piping connections and the flange gasket are tight
3. in the water which will deposit itself on the bottom of the storage section For this reason it is recommended 12 to drain the shell section down once a ear refill it and drain it again The heating coil should be inspected and cleaned of any scale or mineral deposits that may attach themselves to the heating surface The heating surface may be cleaned Refer to vendor s heat exchanger instruction sheet FLUSHING A DANGER Burn hazard Hot water discharge Keep clear of drain valve discharge Valve off the heating medium steam or hot water Open the drain valve Allow water to flow until it comes clean Close the drain valve when finished flushing mn a m Open heating medium valve SEDIMENT REMOVAL Water borne impurities consist of fine particles of soil and sand which settle out and form a layer of sediment on the bottom of the tank Sediment accumulation in the tank is a normal condition common to all storage tanks Factors which affect the amount of this formation are 1 Amount of hot water used As the volume of water heated increases more scale results Water temperature As the temperature of the water is increased more scale is deposited on the elements Characteristics of water supply Regardless of water treatment the elements should be examined regularly Water scale accumulations may cause noises to occur during operation It is recommended that periodic visual checks are made
4. 00V 400 107 42 2512 19 212 8 5004 500 86 54 30 25 2 3 HWG48 750V 750 118 54 30 2512 3 HWG48 1000V 1000 150 54 30 2512 3 LIFTING LUG E HOT WATER 2 PLCS RELIEF VALVE TEMPERATURE GAUGE PRESSURE GAUGE CONTROL PROBE INTEGRAL CIRCULATOR DRAIN OPTIONAL MANWAY WATER OR HANDHOLE INLET E MOR _ GAL A B p F HWG 200H 200 77 41 16 26 21 2 36 HWG 350H 350 93 47 16 30 12121 42 HWG 400H 400 99 47 17 HWG 500H 500 79 59 23 42 3 HWG 750H 750 111 59 23 42 3 54 HWG 1000H 1000 143 59 23 42 3 Ww TYPICAL WATER HEATER TRIM MR zT ER CONTROL VALVE EN STRAINER wy K 2 PRESSURE GAUGE DRIP TRAP VACUUM BRAKER STRAINER Na MASS 1 FIGURE 3 TYPICAL STEAM WATER PIPING MAIN STEAM TRAP CONTROL VALVE BOILER WATER TEMPERATURE FIGURE 4 TYPICAL WATER TO WATER 3 WAY PIPING 6 APPROVAL 09642518 model 18 DIGIT MODEL NO item id serial JO7R000385 lot 3 385 type 0 A O SMITH ATER PRODUCTS CO 43 MAX ALLOW PSI MFG SER NO YEAR BUILT 200 CAPACITY US GAL LOCATING THE NEW WATER HEATER FACTS TO CONSIDER ABOUT THE LOCATION CAUTION All water heaters eventually leak Do notinstall without adequate drainage Installation of the wat
5. If the tank bottom has an accumulation of sediment it should be cleaned SEDIMENT REMOVAL 1 Valve off the heating medium 2 Drain the hot water generator following DRAINING instructions Remove sediment and scale from the tank bottom through the access provided by the element opening or tank cleanout if furnished The cold water inlet valve and drain valve may be opened to aid the cleanout process 4 Follow FILLING instructions to restore hot water service Check for water leaks around access openings and proper operation when heater is filled CHECKLIST Before calling for service check the following points to see if the cause of trouble can be identified and corrected Reviewing this checklist may eliminate the need of a service call and quickly restore hot water service The illustration on page 5 identifies the location of most of the heater components BE SURE TO TURN OFF THE ELECTRICITY WHEN CHECKING EQUIPMENT PUMP NOT ENOUGH OR NO HOT WATER The capacity of the hot water generator may have been exceeded by a large demand for hot water Large demands require a recovery period to restore water temperature Cold incoming water temperature will lengthen the time required to heat water to the desired temperature If the hot water generator was installed when incoming water temperature was warm colder water creates the effect of less hot water Look for hot water wastage and leaking or open hot water fauc
6. Instruction Manual fe Smith A DIVISION OF A O SMITH CORPORATION RENTON WASHINGTON www hotwater com GO ASME Thank you for buying this water heater We appreciate your confidence in our products AWARNING 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 h aq N V VERTICAL AND HORIZONTAL MODELS HWG 140 THRU HWG 1000 INSTALLATION OPERATION SERVICE MAINTENANCE LIMITED WARRANTY A pu DIES gt m 0 7 YZ A WARNING If the heater becomes immersed in water up to or above the level of the base channels the heater should be examined by a qualified service agency before it is placed in operation see Page 2 PLACE THESE INSTRUCTIONS ADJACENT TO HEATER AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE PRINTED 0610 315823 001 AFE INSTALLATION E AND RVI 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 Itis very important that th
7. OR WITH RESPECT TO THE MERCHANTABILITY OF THE HEATER OR THE INSTALLATION OPERATION REPAIR OR REPLACEMENT OF THE HEATER 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 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 a Some states do not allow the exclusion or limitation of the incidental or consequential damage so the above limitation or exclusion may not apply to you b This warranty gives you specific legal rights and you may also have other rights which vary from state to state Fill in the following for your own reference Keep it Registration is not a condition of warranty The model and serial number are found on the heater s rating plate Model No Serial No Date Installed Dealer s Name Dealer s Address Phone No City and State Zip 15 17 19 fe Smith A DIVISION OF A O SMITH CORPORATION RENTON WASHINGTON Technical Support 800 527 1953 Parts Department 800 433 2515 www hotwater com
8. ROBLEM POSSIBLE MALFUNCTION SERVICE TO BE PERFORMED SLOW OR INADEQUATE Dirty or fouled heating surface Clean the heating surface HEAT RECOVERY Condensate may be held in coil Check trap air vent amp vaccum breaker on heating coil Check trap size and capacity also the condensate piping to make sure it is not operating at a pressure greater than that in the hot water generator If trap size too small increase Steam control valve out of calibration Adjust as necessary a may nol CDSS A I NE Way Cede Check bulb and contact manufacturer of same in thermostatic bulb ruptured bulb A vaccum is created when the steam control valve OVERHEATING OF closes This vaccum may be strong enough to hold Check vaccum breaker on heating section to make sure it is WATER IN STORAGE valve open and allow steam to bleed through and operating overheat stored water WATER HAMMER IN Flooded tube bundle Improper condensate drainage TUBE BUNDLE This will reduce coil capacity and service life Valve may not be seating because 1 Dirt STM Replace regulator seat S S 2 Line drawn seat oversized valve EXCESSIVE PRESSURE Relief valve too small or undersized Check pressure rating and valve operation CAUSING RELIEF Expansion of water from heating may cause excessive L n sion tank downstream of outlet VALVE TO POP pressure as temperature increases so does pressure l 14 WARRANTY A O Smith the warrantor extends t
9. ad instruction manual for safe temperature setting TABLE OF CONTENT SAFE INSTALLATION USE AND 2 GENERAL SAFETY INFORMATION 3 POS NN T 9 Hydrogen Gas Flammable 3 TABLE OF CONTENTS 4 INTRODUCTION u uuu u sn 4 Preparing for the Installation 4 FEATURES COMPONENTS AND DIMENSIONS 6 TYPICAL WATER HEATER TRIM 6 APPROVALS r MODEL AND RATING dci S ebbe cond oer ordner enin 7 LOCATING THE NEW WATER HEATER 7 Facts to Consider About the 7 INSTALLATION 8 Required Ability 8 A 8 Installation 163130068 8 cs I gt E 8 Relief 8 Thermal Expansion Closed System 9 ELECTRICAL DATA ains andanada 9 o een 9 zzi 111 I uuu u A 9 qoi ee 9 WIRING DIAGRAMS 10 OPERATION 11 General eene 11 o Bro TD 11 MAINTENANCE uu a 12 o ee 12 Tank Maintenance
10. approved by the American Society of Mechanical Engineers must have been installed a This warranty shall apply only when the heater is used 1 at temperatures not exceeding the maximum setting of its thermostat 2 at water pressure not exceeding the working pressure shown on the water heater 3 when filled with potable water free to circulate at all times 4 in a noncorrosive and non contaminated atmosphere 5 in the United States its territories or possessions and Canada 6 used with factory approved anode s installed 7 in its original installation location 8 sized in accordance with proper sizing techniques for commercial water heaters 9 bearing a rating plate which has not been altered defaced or removed except as required by the warrantor 10 not used in a closed system without a properly sized and installed thermal expansion tank 11 fired at the proper voltage and wattage 12 maintained in accordance with the instructions printed in the manual included with the heater b Any accident to the water heater any misuse abuse including freezing or alteration of it any operation of it in a modified form or any attempt to repair tank leaks will void this warranty 4 SERVICE and REPAIR EXPENSE 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 r
11. ater or to lower floors of the structure 3 The discharge opening of the temperature and pressure relief valve should always be piped to an open drain 4 Close to the point of major hot water usage and the power supply Hot water piping and branch circuit wiring should be as short as possible Insulate hot and cold water piping where heat loss and condensation may be a problem Heater construction permits installation maintenance and service work to be performed from the front of the unit Ensure enough frontal clearance so that the piping and coil may be removed from the tank Suggested clearances from adjacent surfaces are 12 inches on top for access to the unit The heater may be installed on or against combustible surfaces The left side and back may be placed flush against adjacent surfaces The temperature of the space in which the water heater is installed must not go below 32 F or above 122 F INSTALLATION REQUIRED ABILITY Installation or service of this hot water generator requires ability equivalent to that of a licensed tradesman in the field involved pipe fitting in the steam or boiler water is required See Qualified Installer or Service Agency on page 2 TEMPERATURE PRESSURE RELIEF VALVE A WARNING e Temperature pressure relief valve must comply with ANSI Z21 22 and ASME code Properly sized temperature relief valve must be installed in opening provided e Failure to install relief valve
12. by filling the system with water and operating it at the desired system pressure GENERAL Check the water heater model and rating plate information against the characteristics of the branch circuit electrical supply Do not connect the heater to an improper source of electricity Voltage applied to the water heater should not vary more than 5 to 10 of the model and rating plate marking for satisfactory operation Do NOT energize the branch circuit for any reason before the water heater tank is filled with water The installation must conform to these instructions and the local code authority having jurisdiction Grounding and electrical wiring connected to the water heater must also conform to the National Electrical Code NFPA 70 This publication is available from The National Fire Protection Association 1 Batterymarch Park Quincy MA 02269 BRANCH CIRCUIT The branch circuit wire size should be established through reference to the NEC National Electrical Code or other locally approved sources in conjunction with the water heater amperage rating Wire rated at 75 C should be used Voltage drop should not exceed 3 at the water heater CONTROL CIRCUITS The water heater may be equipped with an electronic control system The typical system includes an electronic controller an immersion temperature probe auto reset high limit electric valve activator and integral circulator pump Refer to control circuit diagram provide
13. can result in overheating and exces sive tank pressure e Failure to follow these instructions could cause serious injury or death This water heater is provided with a properly rated sized and 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 for Hot Water Supply Systems ANSI Z21 22 CSA 4 4 and the code requirements of ASME If replaced the new valve must meet the requirements of local codes but not less than a combination temperature and pressure relief valve rated sized and certified as indicated in the above paragraph The new 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 Btu hr or KW input rate as shown on the water heater s model rating plate For safe operation of the water heater the temperature and pressure 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 Install discharge piping so that any discharge will exit only within 6 inches 15 2 cm above or at any distance below the structural floo
14. d with the HWG for wiring details The actuator is powered by a small 120V 24V transformer The control circuit operates on 120V Please see attached wiring diagrams for appropriate wiring and connections WIRING DIAGRAM GRN RED MOD 151011 EEE FIELD BLU SENSOR Wi HIGH LIMIT RE 120VAC AUTO OR MANUAL RESET EQUIP GND 88 PRIMARY HONEYWELL ML7425A B 120VAC BLK VALVE ACTUATOR CONTROL BOX CIRC PUMP HONEYWELL T775M2048 CONTROLLER WIRING DIAGRAM ELECTRONICALLY ACTUATED CONTROL VALVE FIGURE 5 120V 220V CIRC PUMP WIRING DIAGRAM SELF ACTUATED CONTROL VALVE FIGURE 6 10 OPERATION GENERAL SAFETY Never operate the heating coil without being certain the hot water generator is filled with water and a temperature and pressure relief valve is installed in the relief valve opening on top the heater Additional safety features such as temperature controlled solenoid valves are available as options FILLING THE TANK 1 Valve off the heating medium 2 Close the hot water generator drain valve Open a nearby hot water point of use to allow the air in the system to escape Fully open the cold water inlet valve filling the unit and piping Shut off the hot water at point of use as water starts to flow from the opening Leave the cold water inlet valve fully open The hot water generator is now ready for START UP and TEMPERATURE REGULATION if b
15. e location to ensure the water heater complies with the Locating the New Water Heater section in this manual Clearance must be maintained so that the coil bundle may be removed for servicing after installation 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 FEATURE OMPONENTS AND DIMENSION RELIEF VALVE B LIFTING LUGS E HOT WATER OUTLET TEMPERATURE GAUGE PRESSURE GAUGE eee 1 CONTROL VN PROBE HICH LIMIT TYPICAL OPTIONAL HAND HOLE ANODE ACESS OPTIONAL LWCO ASME PLATE ANODE A ACESS T COLD WATER INLET MN OPTIIONAL MANWAY MANWAY COVER INTEGRAL CIRCULATOR 81 tr DRAIN KC H moa GA A B cI DT E FWG24 440V 140 89 30 22 1114 212 HWGSO 200V 200 85 36 24 15 2 212 HWG36 350V 350 102 42 2512 19 2112 HWG36 4
16. e 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 hazardous A 8 situation which if not avoided will result in death or injury WARNING indicates a potentially hazardous A WARNING situation which if not avoided could result in death or injury CAUTION indicates a potentially hazardous A CAUTION situation which if not avoided could result in minor or moderate injury CAUTION used without the safety alert CAUTION 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 th
17. e substances listed IMPORTANT DEFINITIONS e Qualified Installer or Service Agency Installation and service of this water heater requires ability equivalent to that of a Qualified Agency as defined by ANSI below in the field involved Installation skills such as plumbing and electrical supply are required in addition to electrical testing skills when performing service e ANSI 2223 1 2006 Sec 3 3 83 Qualified Agency Any individual firm 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 NERAL SAFETY INFORMATION PRECAUTIONS DO NOT USE THIS APPLIANCE IF ANY PART HAS BEEN UNDER WATER Immediately call a qualified service technician to inspect the appliance 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 qualified service agency 1 External fire 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 Th
18. eing placed in operation for the first time INITIAL START UP Prior to initial start up all steam and condensate lines or boiler water circulation lines should be blown down or flushed out to prevent any dirt weld slag solder balls etc from entering the heating coil temperature control valves or other apparatus connected to the heater Upon initial start up the main steam globe or gate valve should be cracked slightly to allow the heating surface to come up to operating temperature If cracking noises occur in the heating element on start up do not be alarmed This cracking noise should stop when the heating surface gets warm Do not fully open a steam hand valve on initial start up as this may cause internal damage to the heat exchanger Once the heater is in operation and all valves are adjusted water temperature control should be done by means of the self activated temperature regulator TEMPERATURE REGULATION 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 A DANGER Feel water showering before bathing or Temperature available limiting valves are Read instruction manual for safe temperature setting 11 It is recommended that lower water temperatures be used to avoid the risk of scalding It is further recommended in all cases that
19. epair or reinstallation of the water heater or any component part b Shipping delivery handling and administrative charges for forwarding the new 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 any materials and or permits required for installation of the replacement heater or part 5 LIMITATIONS ON IMPLIED WARRANTIES Implied warranties including any warranty of merchantability imposed on the sale of this heater under state law are limited to one 1 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 limitation may not apply to you 6 CLAIM PROCEDURE Any claim under this warranty should be initiated with the dealer who sold the heater or with any other dealer handling the warrantor s products If this is not practicable the owner should contact PAS PS PS PS PS PS PS APEL AA A O Smith Water Heaters 500 Tennessee Waltz Parkway Ashland City TN 37015 Telephone 800 365 0024 website www hotwater com a The warrantor will only honor replacement with identical or similar water heater or parts thereof which are manufactured distributed by the warrantor b Dealer replacements are made subject to in warranty validation by warrantor 7 DISCLAIMERS NO OTHER EXPRESS WARRANTY HAS BEEN OR WILL BE MADE IN BEHALF OF THE WARRANT
20. er heater must be accomplished in such a manner that if the tank or any connections should leak the flow will not cause damage to the structure For this reason it is not advisable to install the water heater in an attic or upper floor Water heater life depends upon water quality water pressure and the environment in which the water heater is installed Water heaters are sometimes installed in locations where leakage may result in property damage However unanticipated damage can be reduced or prevented by a leak detector or water shut off device These devices are available from some plumbing supply wholesalers and retailers Carefully choose a location for the new water heater The placement is a very important consideration for the safety of the occupants in the building and for the most economical use of the equipment The water heater should be located in an area where the general public does not have access If a suitable area is not available a cover should be installed over the thermostat to prevent tampering Whether replacing an old water heater or putting the water heater in a new location the following critical points should be observed The water heater should be located 1 On a level surface Shim the channel type skid base as necessary if levelling is required 2 Neara floor drain The heater should be located in an area where leakage of the tank or connections will not result in damage to the area adjacent to the he
21. ese must be followed in all cases Failure to ground this water heater properly may also cause erratic control system operation on ELECTRONIC CONTROL models 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 HYDROGEN GAS FLAMMABLE A WARNING Flammable hydrogen gases may be present Keep all ignition sources away from faucet when turning on hot water 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 flammable 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 flow THERE SHOULD BE NO SMOKING OR OPEN FLAME NEAR THE FAUCET AT THE TIME IT IS OPEN When servicing this unit verify the power to the unit is turned off prior to opening the control cabinet door 4 WARNING Read and understand this instruction manual and the safety messages herein before installing operating or servicing this water heater Failure t
22. ets Sediment or lime scale may be affecting water heater operation Refer to MAINTENANCE for details WATER IS TOO HOT Refer to TEMPERATURE REGULATION 13 WATER LEAKAGE IS SUSPECTED Check to see if the drain valve is tightly closed The apparent leakage may be condensation which forms on cool surfaces of the heater and piping If the outlet of the relief valve is leaking it may represent Excessive water pressure Excessive water temperature Faulty relief valve Excessive water pressure is the most common cause of relief valve leakage It is often caused by a closed system A check valve in the inlet system will not permit the expanded hot water volume to equalize pressure with the main A relief valve must release this water or the water heater or plumbing system will be damaged When such a condition is encountered local codes or inspection agency should be consulted to determine which system is acceptable in your area These my consist of Installation of a second relief valve with lower setting than the primary relief valve An expansion tank of suitable pressure and provison to avoid water logging Removal of the check valve IF YOU CANNOT IDENTIFY OR CORRECT THE SOURCE OF MALFUNCTION 1 Place the hot water generator electrical disconnect switch in the OFF position Close the cold water inlet valve to the heater Contact your dealer TROUBLESHOOTIN TROUBLE SHOOTING GUIDE FOR HWG P
23. h the temperature pressure relief valve should be checked to ensure that it is in operating condition Lift the lever at the top of the valve several times until the valve seats properly and operates freely For your safety water heater service should be performed by a qualified service technician Read the general safety information section first A DANGER Burn hazard Hot water discharge Keep clear of relief valve discharge outlet Hot water generator maintenance includes periodic tank flushing and cleaning and removal of lime scale from the heating elements If required by pump manufacturer water heating system circulating pumps should be oiled Summary of Maintenance Schedule Component Operation Interval Required seme Due E HN E HN Heat Exchanger Tube Cleaning Circulating F Pump F Steam Strainer tank As Needed Needed NEN part muriatic acid to 10 parts water for 2 hours y Literature TABLE 3 Tank flushing should be performed in accordance with the above schedule Tank sediment removal and lime scale removal must be performed when needed as determined by periodic inspections The internal shell should be inspected for any rusting or pitting and corrected if possible Maintenance of this nature will provide cleaner water and more efficient operation TANK MAINTENANCE In any water system the storage water heater acts as a settling basin for any foreign matter
24. he following LIMITED WARRANTY to the owner of this water heater 1 THE TANK If the tank in this water heater shall prove upon examination by the warrantor to have leaked due to natural corrosion from potable water therein during the first FIVE years after initial installation the warrantor will supply a complete new A O Smith water heater of equivalent size and current model Some government agencies are requiring energy efficient standards for water heaters In the event regulations prohibit sale of a model of equivalent size and construction A O Smith will provide a model which complies with the regulations of your area in which case the consumer will be charged the difference in price between the like replacement and the energy efficient model required The warranty on the replacement water heater will be limited to the unexpired term of the original warranty 2 ALL OTHER PARTS If within ONE year after initial installation of this water heater any part or portion shall prove upon examination by the warrantor to be defective in material or workmanship the warrantor will repair or replace such part or portion at its option 3 CONDITIONS and EXCEPTIONS This warranty shall apply only when the water heater is installed in accordance with local plumbing and building codes ordinances and regulations the printed instructions provided with it and good industry practices In addition a temperature and pressure relief valve certified by A G A and
25. kin Nearly Instantaneous Nearly Instantaneous About 1 2 Second About 1 1 2 Seconds Less than 5 Seconds About 30 Seconds More than 5 Minutes Water Temperature 180 F 82 C 170 F 77 C 160 F 71 C 140 F 60 C 150 F 65 C 130 F 54 C Never allow small children to use a hot water tap or to draw their own bath water Never leave a child or handicapped person unattended in a bathtub or shower Refer to the vendor manual s attached for information on electric temperature controls and valve actuators DRAINING THE TANK The water heater must be drained if it is to be shut down and exposed to freezing temperatures Maintenance and service procedures may also require draining the hot water generator Turn off power to the water heater Turn the valve off to the heating medium steam or hot water Close the cold water inlet valve to heater Open a nearby hot water faucet to vent the system Open drain valve Danger Water temperature over 125 F 52 C can cause severe burns instantly resulting in severe injury or death Take precautions to prevent contact with the water being drained Ifthe hot water generator is being drained for an extended shutdown it is suggested the drain valve be left open during this period Follow FILLING instructions when restoring hot water service MAINTENANCE NOTE SEE ATTACHED VENDOR INFORMATION FOR MAINTENANCE OF COMPONENTS GENERAL Once a mont
26. o follow these instructions and safety messages could result in death or serious injury This manual must remain with the water heater A WARNING Overheated water can cause watertank explosion e Properly sized temperature and pressure relief valve must be installed in opening provided CAUTION Improper Installation use and service may result in property damage Do not operate water heater if flood damaged Inspect anode rods regularly replace when significantly depleted 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 A WARNING Flammable hydrogen gases may be present Keep all ignition sources away from faucet when turning on hot water WARNING Before removing any access panels or servicing the water heater make sure the electrical supply to the water heater is turned OFF e Failure to do this could result in death serious bodily injury or property damage 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 showering Temperature limiting valves are available Re
27. product IT IS NECESSARY THAT ALL WATER PIPING AND THE ELECTRICAL WIRING BE INSTALLED AND CONNECTED AS SHOWN IN THE DIAGRAMS 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 Use same size and type of fuse when replacing The principal components of the heater are identified on page 6 The model and rating plate on page 7 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 The National Electrical Code may be ordered from National Fire Protection Association 1 Batterymarch Park Quincy MA 02269 3 If after reading this manual you have any questions or do not understand any portion of the instructions call the toll free number on the back cover for further assistance A sample rating plate and barcode tag are shown on page 7 of this manual In order to expedite your request please have the serial number and item ID from the barcode tag available for the technician 4 Carefully plan your intended placement of the water heater Examine th
28. r 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 discharge piping directly to the drain unless a 6 15 2 cm air gap is provided To prevent bodily injury hazard to life or property damage the relief valve must be allowed to discharge water in adequate 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 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 Must terminate a maximum of six inches above a floor drain or external to the building In cold climates it is recommended that the discharge pipe be terminated at an adequate drain inside the building e Shall not have any
29. the water temperature 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 Short repeated heating cycles caused by small hot water uses can cause temperatures at the point of use to exceed the thermostat setting by up to 20 F 11 C If you experience this type of use you should consider using lower temperature settings to reduce scald hazards HOT 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 from this heater 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 people or at the water heater Mixing valves are available at plumbing supply or hardware stores Follow manufacturer s instructions for installation of the valves Time to Produce 2nd amp 3rd Degree Burns on Adult S
30. valve or other obstruction between the relief valve and the drain A DANGER 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 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 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 in this manual and replace the temperature pressure relief valve with a properly rated sized new one If you do not understand these instructions or have any questions regarding the temperature pressure relief valve call the toll free number listed on the back cover of this manual for technical assistance CLOSED WATER SYSTEMS Water supply systems may because of code requirements or such conditions as high line pressure among others have installed devices such as pressure reducing valves check valves and back flow preventers Devices such as these cause the water system to be a closed system THERMAL EXPANSION As water is heated it expands thermal expansion In a closed system the volume of water will grow when it is
Download Pdf Manuals
Related Search