A.O. Smith DVE Owner's Manual
Contents
1. 220 26 Recovery Rating RECOVERY RATE IN GALLONS PER HOUR Temperature Rise F Standard BTU KW Input Hour 70 80 DREDVE G 20478 e2 62 49 6 31 27 6 22 2i 19 18 DREDVE 9 30717 125 92 74 62 53 41 57 34 31 28 26 DREDVE 12 40 956 164 123 98 82 70 6 5s 49 4s 41 38 95 DREDDVE 135 46075 184 138 m 92 79 65 6e 5 50 46 49 4o DREDVE 1s 51 195 205 i54 123 102 6 77 6 er 6 51 47 44 DREIVE 24 81 912 328 246 197 164 140 123 109 o8 89 82 76 70 Figured at 1 KW 3413 Btu 4 1 gallons at 100 F temperature rise To determine recovery rate per minute divide recovery rate per hour by 60 Approvals All models bear the National Sanitation Foundation seal of approval All models are listed by Underwriters Laboratories Inc NSF JL LISTED 221 ITEM ID PART NUMBER SERIAL NUMBER Model and Rating COMMERCIAL STORAGE TANK WATER HEATER MODEL NUMBER DRE 120 917 J04M008327 9290443004 WATTS CAPACITY WORKING GAL PRESSURE TOTAL U NO OF WATTS VOLTS AC PHASE ELEMENTS _ EACH 480 3 9 6000 s4000 150 CITY OF NEW YORK DEPT OF BUILDINGS MEA O SMITH WATER PRODUCTS MCBEE SOUTH CAROLINA U S A jurisdiction shall be consulted before installations are made BE SURE TO TURN OFF POWE2. 2 Amperage Table Overcurrent Protection 16 GET TO KNOW YOUR WATER HEATER 2 Heater Circuits DVE Models 16 RECOVERY 1 3 cease tases 16 17 APPROVALS oecccccccccccccccsecccecseccessuseescussesteseeeecerenes 3 Power eati ttt 18 21 MODEL AND RATING PLATE 4 OPERATION FOREWORD ste oe tee 4 General Tr 22 GENRAL SAFETY INFORMATION 4 7 0 52 5 Bei 2 Required Ability 2 5 Eod 28 5 IS er ocali 5 Circulating PUMP 22 ocation c MAINTENANCE Waterline Connections 5 23 Relief Devices artet 5 6 Flushing 23 Temperature Limiting Control s 6 23 Temperature Regulation 6 Lime Scale Removal ecce 23 24 PIPING DIAGRAMS nested 7 14 8 24 ELECTRICAL Replacement Parts 24 Genetal niei E E E 14 LEAKAGE CHECKPOINTS 25 Branch Circuit essen 15 LIMITED
3. SEEINSERT 1 2 CIRCULATING PY ALL BRONZE LOOP CIRCULATING TEMPERATURE PUMP CONTROL TEMP amp PRESS RELIEF VALVE TO OPEN DRAIN FLO PAC FITTING INLET SEE INSERT A amp TEMP amp PRESS RELIEF VALVE VACUUM RELIEF VALVE INSTALL PER LOCAL CODES CAUTION IF BUILDING COLD WATER SUPPLY HAS A BACK FLOW PREVENTER CHECK VALVE OR WATER METER WITH CHECK VALVE PROVISIONS FOR THERMAL EXPANSION OF WATER IN THE HOT WATER SYSTEM MUST BE PROVIDED PIPE TO OPEN DRAIN INSTALL IN ACCORDANCE WITH ALL LOCAL CODES WIRING DIAGRAM FIXTURE CIRCULATING LOOP IF USED TANK TEMP CONTROL TO OPEN DRAIN CIRCULATING PUMP L2 NEUTRAL CIRCULATING PUMP WIRING DIAGRAM CIRCULATING LOOP TEMPERATURE CONTROL TANK TEMP L1 CONTROL NEUTRAL TOGGLE SWITCH WITH RED PILOT LIGHT PUMP AT DISHWASHER CIRCULATING 5 LOOP PUMP ONE TEMPERATURE ONE HEATER VERTICAL STORAGE TANK FORCED CIRCULATION WITHOUT BUILDING RECIRCULATION NUUS NOTES 1 TANK TEMPERATURE CONTROL SET AT DESIRED TEMPERATURE MAXIMUM 150 F TEMP 8 PRESS __ FLOW 2 HEATER THERMOSTAT SET AT 180 F AN RELIEF VALVE REGULATING 3 9 4 PUMP AND RETURN PIPING FROM PLUGCOCK GATE TANK TO HEATER ARE ADEQUATE FOR ONE OR TWO HEATERS UP TO 54KW 4 RETURN LINE FROM CIRCULATING LOOP IF USED TO FIXTURES 3 4 ALL BRONZE SHOULD CONNECT TO COLD WATER SUPPLY PIPE 11 0 SYSTEM CIRCULATING
4. ADD AN ANTI SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES FOUR HEATER WITH HORIZONTAL STORAGE TANK INSERT B WITH OR WITHOUT BUILDING RECIRCULATION qmm INSTALL THERMAL EXPANSION TANK ONCOLD WATER SUPPLY LINE IF CHECK VALVE OR PRESSURE REDUCING VALVE TO rue THERMOMETER VALVE IS USED IN SUPPLY TANK TEMP c CONTROL VACUUM RELIEF 170 F MAX 2 VALVE INSTALL PER x R LOCAL CODES 3 1 i STORAGE TANK E SAME SIZE PIPE AS COLD gt SUPPLY BEFORE BRANCH TO FIRST HEATER ine RETURN LINE FROM FIXTURE GATE CIRCULATING LOOP IF USED VALVE 2 Q RELIEF 3 VALVE HEATTRAPTO i DISCONNECT Pu 2 ALL BRONZE APPROXIMATELY 3 SWITCH A CIRCULATING MID POINT OF SE a 2 lt PUMP HEATER lt NE 5 c 11 4 OPENING y ll SEE NOTE PIPE RELIEF VALVE TO OPEN DRAIN TANK TEMPERATURE CONTROL SET AT DESIRED TEMPERATURE MAX 170 F HEATER THERMOSTAT SET AT LEAST 5 HIGHER HEATER 2 1 CAUTION IF BUILDING COLD WATER SUPPLY HAS A BACK FLOW M PREVENTER CHECK VALVE OR WATER METER WITH CHECK VALVE PROVISIONS FOR THERMAL EXPANSION OF WATER IN THE HOT WATER SYSTEM MUST BE PROVIDED i HEATER FLOW CIRCULATING PUMP WIRING DIAGRAM NO 3 REGULATING PLUG COCK TANK TEMPERATURE CONTROL NOTE cal BRANCH PIPING TO ALL HEATERS MUST BE SAME SIZE AND LENGTH FOR EQUAL FLOW THESE BRANCHES MAY BE
5. Batterymarch Park Quincy MA 02269 The CAN CSA C22 2 No M91 is available from the Canadian Standards Association 178 Rexdale Blvd Toronto Ontario Canada M9W 1R3 If your location requires the installation of the water heater to comply with National Sanitation Foundation requirements the heater must be sealed to the floor so as to prevent seepage underneath the heater The following are recommended sealants that may be used on all types of flooring except concrete GE Silicone Seal RTV 120 103 108 and 109 LOCATION For proper installation the heater should be installed on a level surface LOCATE THE WATER HEATER NEAR A FLOOR DRAIN THE HEATER SHOULD BE LOCATED IN AN AREA WHERE LEAKAGE FROM THE HEATER OR CONNECTIONS WILL NOT RESULT IN DAMAGE TO THEADJACENT AREA OR TO LOWER FLOORS OF THE STRUCTURE WHEN SUCH LOCATIONS CANNOT BE AVOIDED A SUITABLE DRAIN PAN SHOULD BE INSTALLED UNDER THE HEATER Such pans should be fabricated with sides at least 2 deep with length and width at least 2 greater than the diameter of the heater and must be piped to an adequate drain Drain pans suitable for these heaters are available from your distributor or Product Service Division A O Smith Water Heater Parts Fulfillment 125 Southeast Parkway Franklin TN 37068 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 le
6. ELEMENTS SINGLE AND THREE PHASE SIX ELEMENTS SINGLE AND THREE PHASE 18 DVE POWER CIRCUIT DIAGRAMS Continued 1 2 BLACK BLUE YELLOW RED L 1 SINGLE PHASE TERMINAL THREE PHASE TERMINAL BLOCK FUSING 30 AMP NINE ELEMENTS SINGLE AND THREE PHASE CONVERSION TO SINGLE PHASE CONVERSION TO THREE PHASE When the heater is shipped for connection to a three phase When heater is shipped for connection to a single phase electrical electrical service it may be connected to a single phase electrical service it may be connected to a three phase electrical service service of the same voltage by of the same voltage by 1 Disconnect blue wires and yellow wires from terminal L3 1 Disconnect blue wires from terminal L1 2 Reconnect all blue wires to terminal L1 with black wires 2 Disconnect yellow wires from terminal L2 3 Reconnect all yellow wires to terminal L2 with red wires 3 Reconnect all blue wires and yellow wires to terminal L3 4 Connect incoming power to terminals L1 and L2 4 Connect incoming power to terminals L1 L2 and L3 19 DRE POWER CIRCUIT DIAGRAMS HEATER CIRCUITS DRE MODELS The water heater s electrical components are pictured and identified on page 2 The following describes the heater circuits and includes wiring diagrams All heater circuits are designed for 60 50 hertz alternating current The DRE circuit wiring is 12 AWG AWM or TEW type rated 6
7. SIZED UP TO 1 1 4 SO COLD WATER SUPPLY SIZED TO MEET APPLICATION AND CONDITIONS SEE INSERT A amp B THAT CROSS SECTIONAL AREAS OF ALL INLETS AND OUTLETS AT LEAST EQUAL AREA OF THEIR RESPECTIVE MAIN PIPING L1 CIRCULATING 120V AC PUMP NEUTRAL REVERSE RETURN PIPING SHOWN 13 MANIFOLD KITS ALL DIMENSIONS IN INCHES TWO HEATERS Part 56 3 4 DRE DVE 52 9003429 DRE DVE 80 9003429 Number 66 1 4 ERE 1 4 70 1 2 60 1 4 31 1 4 4 DRE DVE 120 9003429 73 1 4 64 1 2 35 3 4 5 1 2 Inlet and outlet size 1 2 THREE HEATERS PEE ees Number DRE DVE 52 9003430 DRE DVE 80 9003430 DRE DVE 120 9003430 66 1 4 91 3 4 27 1 4 13 1 4 70 1 2 95 1 4 31 1 4 4 73 1 4 99 1 2 35 3 4 5 2 Inlet and outlet size 2 1 2 FOUR HEATERS Number DRE DVE 52 9003431 DRE DVE 80 9003431 66 1 4 126 3 4 27 1 4 13 1 4 70 1 2 130 1 4 31 1 4 9 4 73 1 4 134 1 2 35 3 4 5 1 2 DRE DVE 120 9003431 Inlet and outlet size 2 1 2 Check the 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 Contact the heater supplier for conversion information if necessary Voltage applied to the 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 REA
8. a field installed circulating pump it must be lubricated before being operated The tube of lubricant supplied with the pump includes directions for use The circulating pump should be of all bronze construction Water heater maintenance includes periodic tank flushing and cleaning and removal of lime scale from the heating element The heater tank is equipped with an anode rod to aid in corrosion control Anode inspection must be performed periodically based on experience or at least annually to check the rod diameter and determine if replacement is necessary The anode is initially about 13 16 to 7 8 diameter with an approximate 1 8 diameter wire in the center of the rod The anode should be replaced when the 1 8 diameter wire is visible as it has been expended in the control of corrosion Your dealer should be contacted for anode inspection 22 Operation GENERAL Never turn on power to the water heater without being certain the water heater is filled with water and a temperature and pressure relief valve is installed in the relief valve opening DO NOT TEST ELECTRICAL SYSTEM BEFORE HEATER IS FILLED WITH WATER FOLLOW FILLING AND START UP INSTRUCTIONS IN OPERATION SECTION FILLING 1 Turn off the electrical disconnect switch Close the water heater drain valve by turning hand wheel to right clockwise Open a nearby hot water faucet to permit the air in the system to escape Fully open the cold water inle
9. control 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 SERVICEMAN 1 EXTERNAL FIRE 2 DAMAGE 3 FIRING WITHOUT WATER GROUNDING INSTRUCTIONS This water heater must be grounded in accordance with the National Electric Code and or local codes These must be followed in all cases 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 4 CAUTION HYDROGEN GAS CAN BE PRODUCED IN A HOT WATER SYSTEM SERVED BY THIS HEATER THAT HAS NOT BEEN USED FOR ALONG 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 Locate the heater close to the point of major hot water usage and the power supply Try to make hot water piping and branch circuit wiring as short as possible e Insulate hot and cold water piping where heat loss and condensation may be a problem THE HEATER SHOULD NOT BE LOCATED INAN AREA WHERE IT WILL BE SUBJECT TO FREEZING Suggested clearances from adjacent surfaces are 18 inches in front for access to the controls and elements and 12 inches from top The heater may be installed on or against combustible surfa
10. on page 2 The model and rating plate illustration on page 4 identifies heater circuit ratings The DVE model has two electrical circuits control circuit where the thermostat directly operates the contactor coils The power circuit which is operated by the control circuit carries the electrical load of the heating elements TRANSFORMER CONNECTION TABLES 1 2 3 4 5 COMMON 208V 240V 277V 480V SECONDARY 120V VOLTS LINE ON LOAD ON COMMON amp 208 208 SECONDARY 120V NOTE THIS TABLE TO BE USED FOR 8 TAP AND 5 TAP TRANSFORMERS VOLTS LINE ON LOAD ON CONNECT 480 Hy amp Hy X amp X 480 1 Hig Ha H3 0000 208 a X1 8 X DVE CONTROL CIRCUIT DIAGRAMS TERMINAL BLOCK CONTROL CIRCUIT 120 VOLT 52 82 AND 120 TRANSFORMER HI TEMP CUT OFF THERMOSTAT CONTACT COIL NO 4 CONTACT COIL NO 3 CONTACT COIL NO 2 CONTACT COIL NO 1 ONE THERMOSTAT FOUR CONTACTORS SIX ELEMENTS TERMINAL BLOCK L4 L2 L3 THERMOSTAT CONTACT COIL NO 2 CONTACT COIL NO 3 CONTACT COIL NO 1 EXCEPT FROM TERMINAL BLOCK TO FUSE BLOCK ARE SAME GAUGE AND COLOR AS POWER CIRCUIT CONTACT COIL NO 4 TERMINAL BLOCK CONTROL CIRCUIT 120 VOLT 52 82 AND 120 TRANSFORMER THERMOSTAT ALL WIRING NO 14 GA WHITE CONTACT CONTACT COIL NO 2 COIL NO 1 ONE THERMOSTAT TWO CONTACTORS THREE ELEMENTS
11. relief valve certified by a nationally recognized testing laboratory that maintains periodic inspection of production of listed equipment or materials as meeting the requirements for Relief Valves for Hot Water Supply Systems ANSI 221 22 CSA 4 4 current version This valve must be marked with a maximum set pressure not to exceed the marked maximum working pressure of the water heater INSTALL THE VALVE INTO AN OPENING PROVIDED AND MARKED FOR THIS PURPOSE IN THE WATER HEATER AND ORIENT IT OR PROVIDE TUBING SO THAT ANY DISCHARGE FROM THE VALVE WILL EXIST ONLY WITHIN 6 INCHES ABOVE OR AT ANY DISTANCE BELOW THE STRUCTURAL FLOOR AND CANNOT CONTACT ANY LIVE ELECTRICAL PART THIS DISCHARGE OPENING MUST NOT BE BLOCKED OR REDUCED IN SIZE UNDER ANY CIRCUMSTANCES Installation REQUIRED ABILITY 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 INVOLVED GENERAL 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 current version of the National Electrical Code NFPA 70 or for Canadian requirements the current version of the Canadian Electric Code CAN CSA C22 2 No M91 These codes may be obtained from the following institutes The NFPA 70 is available from the National Fire Protection Association 1
12. temperature 6 Look for hot water leakage 7 Sediment or pipe scale may be affecting water heater operation Refer to page 23 for details Water is too hot 1 Sediment or lime scale accumulations on the elements causes sizzling and hissing noises when the heater is operating The sounds are normal however the tank bottom and elements should be cleaned Refer to page 23 for details Leakage Checkpoints INSTRUCTIONS USE THIS ILLUSTRATION AS A GUIDE WHEN CHECKING FOR SOURCES OF WATER LEAKAGE YOU OR YOUR DEALER MAY BE ABLE TO CORRECT WHAT APPEARS TO BE A PROBLEM Where possible remove or lift top cover to examine threads of fittings installed into tank for evidence of leakage Correct fitting leaks as necessary Relief valve operation and leakage may be due to water expansion during heating cycle or foreign material on seat of valve If the valve is not piped to an open drain the released water could be mistaken for a leaking heater To check where threaded portion enters tank insert Q tip or similar absorbent material between jacket opening and valve to swab spud area Remove valve if leak is indicated and repair with pipe joint compound Water on the side of the tank may be condensation due to the panel or insulation not e elements may be due to ments which leak at terminals ange Replace element nt gasket leak ent with element wrench If leak emove element and discard
13. 00 volts 105 C FUSING Fusing consists of two 30 amp class G fuses for each element See wiring diagrams Do not substitute fuses of a different rating SINGLE PHASE L1 L2 SINGLE PHASE L i L 2 TERMINAL BLOCK BLACK BLUE YELLOW RED TERMINAL BLOCK BLACK BLUE YELLOW RED THREE PHASE La THREE PHASE TERMINAL BLOCK BLUE YELLOW TERMINAL BLOCK FUSING 30 AMP FUSING 30 AMP lt lt gt m THERMOSTAT AND MANUAL RESET HIGH LIMIT SWITCH THERMOSTAT AND MANUAL RESET HIGH LIMIT SWITCH THREE ELEMENTS SINGLE AND THREE PHASE SIX ELEMENTS SINGLE AND THREE PHASE 20 DRE POWER CIRCUIT DIAGRAMS L 2 YELLOW RED L 1 BLACK BLUE SINGLE PHASE TERMINAL BLOCK THREE PHASE TERMINAL BLOCK FUSING 30 AMP THERMOSTAT AND MANUAL RESET HIGH LIMIT SWITCH NINE ELEMENTS SINGLE AND THREE PHASE CONVERSION TO THREE PHASE When heater is shipped for connection to a single phase electrical service it may be connected to a three phase electrical service of the same voltage by 1 Disconnect blue wires from terminal L1 2 Disconnect yellow wires from terminal L2 3 Reconnect all blue wires and yellow wires to terminal L3 4 Connect incoming power to terminals L1 L2 and L3 21 CONVERSION TO SINGLE PHASE When the heater is shipped for connection to a three phase electrical service it may be connected to a single phase electrical service of the same voltage by 1 Disconne
14. ATER FLOW REGULATING PLUG COCK VACUUM RELIEF VALVE INSTALL PER COLD WATER INLET m LOCAL CODES SEE INSERT A amp B N Wow AU CONTROL CIRCULATING PUMP WIRING DIAGRAM ALL BRONZE LINE TEMPERATURE CIRCULATING CONTROL PUMP Li 120V AC CIRCULATING PUMP DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE AT FIXTURES SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 6 IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT ADD AN ANTI SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES CAUTION IF BUILDING COLD WATER SUPPLY HAS A BACK FLOW PREVENTER CHECK VALVE OR WATER METER WITH CHECK VALVE PROVISIONS FOR THERMAL EXPANSION OF WATER IN THE HOT WATER SYSTEM MUST BE PROVIDED PIPE TO OPEN DRAIN INSTALL IN ACCORDANCE WITH ALL LOCAL CODES DRAIN VALVE se 1 1 4 OPENING INSTALL THERMAL EXPANSION TANKON COLD WATER SUPPLY LINE IF CHECK VALVE OR PRESSURE REDUCING VALVE IS USED IN SUPPLY PRESSURE RELIEF VALVE TWO HEATERS WITH OR WITHOUT MIXING VALVE WITH OR WITHOUT BUILDING RECIRCULATION MIXING VALVE APPLICATION FOR TWO TEMPERATURE WATER RETURN FROM CIRCULATING LOOP FOR STORED TEMPERATURE WATER IF USED HOT WATER OUTLET LINE TEMPERATURE TEMPERED CONTROL WATER E OUTLET N e 2 OUTEET HOT WATER 1 1 4 OPENING CHECK VALVE MIXING VALVE CHECK VALVE FUSED COLD WATER ALL BRONZE DISCONNECT 4 INLET CIRCULATING SWITCH SEE INSERT A amp B PUMP CIRC
15. CH PIPING TO ALL HEATERS MUST BE SAME SIZE AND LENGTH NO 2 FOR EQUAL FLOW THESE BRANCHES MAY BE SIZED UP TO 1 4 SO THAT CROSS SECTIONAL AREAS OF ALL INLETS AND OUTLETS AT LEAST EQUAL AREA OF THEIR RESPECTIVE MAIN PIPING MUST BE IDENTICAL HEATERS REVERSE RETURN PIPING SHOWN 11 THREE HEATERS WITH VERTICAL STORAGE TANK WITH OR WITHOUT BUILDING RECIRCULATION CIRCULATING PUMP WIRING DIAGRAM HOT WATER TANK TEMPERATURE TO FIXTURES REE CONTROL VALVE CIRCULATING PUMP L1 120V AC 12 THERMOMETER NEUTRAL FUSED DISCONNECT RELIEF 11 4 OPENING VALVE SEE NOTE FLOW REGULATING REVERSE RETURN PIPING SHOWN PLUG COCK P PE RELIEF VALVE TO OPEN DRAIN 1 1 2 HV ALL RRONZE cuni STING RELIEF VAL ri A DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE AT FIXTURES SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 6 IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT ADD AN ANTI SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES THREE HEATERS WITH HORIZONTAL STORAGE TANK WITH OR WITHOUT BUILDING RECIRCULATION HOT WATER TO FIXTURES THERMOMETER INSTALL THERMAL EXPANSION T amp P TANK ONCOLD WATER SUPPLY LINE IF CHECK VALVE OR TTANK TEMP PRESSURE REDUCING VALVE CONTROL IS USED IN SUPPLY 170 F MAX RELIEF D VALVE SAME SIZE PIPE AS COLD SUPPLY BEFORE BRANCH TO FIRST HEATER
16. CK VALVE 3 INLET MIXING VALVE SEE INSERT JD 1 A amp B 25 1 CHECK VALVE ap SML Px CIRCULATING on Gore PUMP S34 CHECK ye AL VALVE FLOW REGULATING PLUG COCK CIRCULATING RETURN LINE CONNECTION TEMPERED WATER LOOP IF USED CONNECT TO POINT R CIRCULATING PUMP WIRING DIAGRAM LINE TEMPERATURE CONTROL CIRCULATING L1 120V AC 12 PUMP ALL MANIFOLDING MUST BE EQUAL LENGTH HEATER NO 1 CAUTION IF BUILDING COLD WATER SUPPLY HAS ABACK FLOW PREVENTER CHECK VALVE OR WATER METER WITH CHECK VALVE PROVISIONS FOR THERMAL EXPANSION OF WATER IN THE HOT WATER SYSTEM MUST BE PROVIDED 11 4 OPENING PIPE TO OPEN DRAIN ien INSTALL IN ACCORDANCE WITH ALL LOCAL CODES e i MUST BE IDENTICAL HEATERS FOUR HEATERS WITH OR WITHOUT MIXING VALVE WITH OR WITHOUT BUILDING RECIRCULATION RETURN LINE FROM CIRCULATING LOOP FUSED FOR STORED TEMPERATURE WATER SWITCH COLD WATER INLET MUST BE IDENTICAL HEATERS LINE TEMPERATURE CONTROL CAUTION IF BUILDING COLD WATER SUPPLY HAS A BACK FLOW TEMPERATURE AND PRESSURE RELIEF VALVE CIRCULATING r 2 HEATER 3 HEATER NO 4 CIRCULATING PUMP WIRING DIAGRAM LINE TEMPERATURE CONTROL CIRCULATING PUMP 120 NEUTRAL A DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE AT FIXTURES SEE WATER TEMPERATU
17. CONTROL CIRCUIT 120 VOLT 52 82 AND 120 TRANSFORMER HI TEMP CUT OFF CONTACT COIL NO 5 CONTACT COIL NO 6 ONE THERMOSTAT SIX CONTACTORS NINE ELEMENTS CONTROL CIRCUIT 120 VOLT 52 82 AND 120 TRANSFORMER CUT OFF LOWER THERMOSTAT MIDDLE THERMOSTAT UPPER THERMOSTAT CONTACT COIL NO 5 CONTACT COIL NO 6 CONTACT COIL NO 4 CONTACT COIL NO 3 CONTACT COIL NO 2 CONTACT COIL NO 1 THREE THERMOSTATS SIX CONTACTORS NINE ELEMENTS USE ONLY 3 AMP CLASS G FUSES AS CONTROL CIRCUIT ON IMMERSION THERMOSTAT MODELS 17 TERMINAL BLOCK CONTROL CIRCUIT 120 VOLT 52 82 AND 120 TRANSFORMER HI TEMP CUT OFF THERMOSTAT CONTACT COIL NO 4 CONTACT COIL NO 3 CONTACT COIL NO 2 CONTACT COIL NO 1 TWO THERMOSTATS FOUR CONTACTORS SIX ELEMENTS DVE POWER CIRCUIT DIAGRAMS POWER CIRCUIT The power circuit wiring is 12 Awg AWM or TEW type rated 600 volts 105 C Power circuit fusing consists of three 30 amp class G fuses for each contactor See wiring diagrams Do not substitute fuses of a different rating SINGLE PHASE L2 L2 SINGLE PHASE L 1 L 2 TERMINAL BLOCK BLACK BLUE YELLOW RED TERMINAL BLOCK BLACK BLUE YELLOW RED THREE PHASE TERMINAL BLOCK THREE PHASE TERMINAL BLOCK FUSING 30 AMP FUSING 30 AMP CONTACTOR ELEMENT ELEMENT THREE
18. Models DRE amp DVE 0 COMMERCIAL ELECTRIC WATER HEATERS Dura Power e INSTALLATION OPERATION MAINTENANCE LIMITED WARRANTY A O Smith A CAUTION TEXT PRINTED OR UNDERLINED IN RED Water Heaters CONTAINS INFORMATION RELATIVE TO YOUR SAFETY PLEASE READ THOROUGHLY BEFORE A DIVISION OF A O SMITH CORPORATION ATTEMPTING ANY CONVERSION MCBEE SOUTH CAROLINA www hotwater com PLACE THESE INSTRUCTIONS ADJACENT TO HEATER AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE PRINTED IN U S A 0906 PART NO 196674 001 OUTLET OPENING CONDUIT OPENING Inlet Outlet 11 4 11 4 11 4 WATER OUTLET OPENING 1 e COLD WATER INLET gre TERMINAL BLOCK FUSE BLOCK MANUAL RESET HIGH LIMIT THERMOSTAT W T NER tL Rough in Dimensions OUTLET OPENING 3 4 NPT T amp P OPENING BRASS DRAIN VALVE INLET OPENING Model Number DRE DVE 52 DRE DVE 80 DRE DVE 120 Get to know your water heater DVE WATER OUTLET POWER CIRCUIT FUSE BLOCK TERMINAL CONTROL CIRCUIT BLOCK RELIEF ea AE OPENING POWER CIRCUIT FUSE BLOCK CONTACTOR MANUAL RESET HIGH LIMIT i THERMOSTAT HEATING ELEMENT 9 0 DRAIN E VALVE 1 INLET Contents Page Page ROUGH IN DIMENSIONS
19. OL DISCONNECT SWITCH THERMOMETER MIXING VALVE CHECK VALVE ALL BRONZE CIRCULATING PUMP TEMP amp PRESS RELIEF VALVE WATER INLET 180 F WATER TO OPEN DRAIN OUTLET CIRCULATING PUMP WIRING DIAGRAM WIRING DIAGRAM TEMPERED WATER CIRCULATING LOOP IF USED TANK TEMP TOGGLE SWITCH CONTROL WITH RED PILOT LIGHT TANK TEMP AT DISHWASHER CONTROL CIRCULATING PUMP CIRCULATING PUMP 10 TWO HEATER WITH VERTICAL STORAGE TANK WITH OR WITHOUT BUILDING RECIRCULATION CIRCULATING PUMP WIRING DIAGRAM TRP TANK TEMPERATURE HOT WATER RELIEF CONTROL TO FIXTURES VALVE L1 RETURN LINE FROM FIXTURE CIRCULATING LOOP 120V AC ui NS IF USED SHOULD CONNECT ANY OPENING MEX L2 NEAR BOTTOM OF TANK N NEUTRAL PIPE RELIEF VALVE TO OPEN DRAIN gt 4 THERMOMETER TANK TEMPERATURE CONTROL SET DESIRED I FUSED TEMPERATURE MAX 170 HEATER THERMOSTAT di DISCONNECT SET AT LEAST 5 HIGHER SWITCH TEP 11 4 OPENING INSTALL IN ACCORDANCE WITH ALL LOCAL CODES FLOW RELIEF SEE NOTE REGULATING CAUTION IF BUILDING COLD WATER SUPPLY HAS A STORAGE TANK PLUG COCK BACK FLOW PREVENTER CHECK VALVE OR WATER METER WITH CHECK VALVE PROVISIONS FOR THERMAL EXPANSION OF WATER IN THE HOT WATER TANK SYSTEM MUST BE PROVIDED A DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE AT FIXTURES SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 6 IF INSERT B HIGHER PREHEA
20. R WHEN WORKING ON OR NEAR THE ELECTRICAL SYSTEM OF THE HEATER NEVER TOUCH ELECTRICAL COMPONENTS WITH WET HANDS OR WHEN STANDING IN WATER WHEN REPLACING FUSES ALWAYS USE THE CORRECT SIZE FOR THE CIRCUIT SEE PAGE 16 THROUGH 21 The principal components of the heater are identified on page 2 The model and rating plate on page 4 interprets certain markings into useful information Both of these references should be used to identify the heater its components and optional equipment 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 INSULATION BLANKETS Insulation blankets available to the general public for external use on water heaters are not approved for use on your Smith water heater The purpose of an insulation blanket is to reduce the standby heat loss encountered with storage tank water heaters Your A O Smith water heater meets or exceeds the ASHRAE IES 90 1b 1992 standards with respect to insulation and standby loss requirements making an insulation blanket unnecessary A WARNING Should you choose to apply an insulation blanket to this heater you should follow these instructions See Getting to know your water hea
21. RE CONTROL WARNING ON PAGE 6 IF HIGHER PREHEAT HEATER ALL MANIFOLDING MUST FLOW TO NO 1 BE EQUAL LENGTH REGULATING 3 5 PLUG COCK INSTALL THERMAL EXPANSION PREVENTER CHECK VALVE OR WATER METER WITH CHECK VALVE PROVISIONS FOR THERMAL EXPANSION OF WATER IN THE HOT WATER SYSTEM MUST BE PROVIDED PIPE TO OPEN DRAIN INSTALL IN ACCORDANCE WITH ALL LOCAL CODES MIXING VALVE APPLICATION FOR TWO TEMPERATURE WATER HOT WATER TEMPERED WATER OUTLET MIXING VALVE CHECK VALVE CIRCULATING RETURN LINE CONNECTIONS TEMPERED WATER LOOP IF USED CONNECT TO POINT R INSERTB __ TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT ADD AN ANTI SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES TWO TEMPERATURE WITH 180 CIRCULATING LOOP AND STORAGE TANK NOTES 1 TANK TEMPERATURE CONTROL SET AT DESIRED TEMPERATURE MAXIMUM 150 F TANK ONCOLD WATER SUPPLY LINE IF CHECK VALVE OR PRESSURE REDUCING VALVE IS USED IN SUPPLY 140 WATER 2 HEATER THERMOSTAT SET 180 F SHUTOFF 3 SYSTEM PUMP AND FLO PAC FITTING SIZED TO MAXIMUM OF ONE 54KW HEATER 4 3 4 SYSTEM PIPING BETWEEN HEATER AND TANK THERMOMETER C le CHECK VALVE PLUG cock 3 180 WATER 3 4 OUTLET ALL BRONZE y CIRCULATING E LOOP TO PUMP FUSED m 2 DISHWASHER DISCONNECT ZEN WATER i SWITCH 2 OUTLET 6 0 Be COLD WATER Po SUPPY 4
22. RETURN FROM FIXTURE CIRCULATING LOOP IF USED VACUUM RELIEF VALVE INSTALL PER LOCAL CODES 11 2 11 4 OPENING SEE NOTE CIRCULATING PUMP WIRING DIAGRAM RELIEF i VALVE TANK TEMPERATURE h 11 2 HV ALL CONTROL Ko BRONZE CIRCULATING Y di PUMP 120 CIRCULATING L2 PUMP NEUTRAL HEAT TRAP TO APPROXIMATELY MID POINT OF HEATER REVERSE RETURN PIPING SHOWN PIPE RELIEF VALVE TO OPEN DRAIN FLOW TANK TEMPERATURE CONTROL SET AT DESIRED TEMPERATURE HE ATE REGULATING 170 F HEATER THERMOSTAT SET AT LEAST 5 HIGHER PLUG COCK HEATER 6 CAUTION IF BUILDING COLD WATER SUPPLY HAS BACK FLOW NO 3 ky PREVENTER CHECK VALVE OR WATER METER WITH CHECK VALVE 2 PROVISIONS FOR THERMAL EXPANSION OF WATER THE HOT WATER IDENTICRIAIE AEBS kee SYSTEM MUST BE PROVIDED COLD WATER SUPPLY SIZED TO MEET APPLICATION BRANCH PIPING TO ALL HEATERS MUST BE SAME SIZE AND LENGTH AND CODE CONDITIONS FOR EQUAL FLOW THESE BRANCHES MAY BE SIZED UP TO 1 1 4 SO SEE INSERT A amp B THAT CROSS SECTIONAL AREAS OF ALL INLETS AND OUTLETS AT LEAST EQUAL AREA OF THEIR RESPECTIVE MAIN PIPING 12 FOUR HEATER WITH VERTICAL STORAGE TANK WITH OR WITHOUT BUILDING RECIRCULATION INSTALL IN ACCORDANCE WITH ALL LOCAL CODES HOT WATER x TO FIXTURES RELIEF CAUTION IF BUILDING COLD
23. SE PUMP LOCAL CODES CIRCULATING PUMP WIRING DIAGRAM 3 4 TANK TEMP CONTROL THERMOMETER N CIRCULATING q W PUMP L2 WS NEUTRAL COLD WATER SUPPLY SIZED TO MEET APPLICATION AND CODE CONDITIONS SEE INSERT A 8 B TEMP amp PRESS RELIEF VALVE A DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TO OPEN DRAIN TEMPERATURE AT FIXTURES SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 6 IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT ADD AN ANTI SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES TANK TEMP CONTROL SAME SIZE PIPE AS COLD SUPPLY TO HEATER TWO TEMPERATURE WITH MIXING VALVE AND CIRCULATING LOOP 1 1 4 OPENING CAUTION IF BUILDING COLD WATER SUPPLY HAS A BACK FLOW PREVENTER CHECK VALVE OR WATER METER WITH CHECK VALVE THERMOMETER INSTALL THERMAL EXPANSION PROVISIONS FOR THERMAL EXPANSION OF WATER IN THE HOT TANKONCOLD WATER SUPPLY WATER SYSTEM MUST BE PROVIDED HOT LINE IF CHECK VALVE OR WATER PRESSURE REDUCING VALVE PIPE TO OPEN DRAIN OUTLET IS USED IN SUPPLY INSTALL IN ACCORDANCE WITH ALL LOCAL CODES TEMPERED WATER OUTLET COLD WATER SUPPLY SEE INSERT A amp B FUSED TEMP amp PRESS DISCONNECT SWITCH RELIEF VALVE TWO TEMPERATURE WITH MIXING VALVE 180 WATER COLD WATER SUPPLY OUTLET SEE INSERT A amp B CHECK VALVE THERMOMETER TO OPEN DRAIN CIRCULATING LOOP FUSED TEMPERATURE CONTR
24. SON BEFORE THE HEATER TANK IS FILLED WITH WATER DOING SO WILL CAUSE THE HEATING ELEMENTS TO BURN OUT The branch circuit is connected to the heater wiring through an opening provided on the heater 14 Electrical GENERAL The installation must conform to these instructions the local code authority having jurisdiction and the requirements of the power company In the absence of codes requirements follow the current version of NFPA 70 The National Electrical Code which may be ordered from National Fire Protection Association 1 Batterymarch Park Quincy MA 02269 A WARNING AN ELECTRICAL GROUND IS REQUIRED TO REDUCE RISK OF ELECTRIC SHOCK OR POSSIBLE ELECTROCUTION The water heater should be connected to a separate grounded branch circuit with overcurrent protection and disconnect switch The water heater should be grounded in accordance with national and local codes BRANCH CIRCUIT The branch circuit wire and fuse size should be established through reference to the current version of the National Electrical Code or any other locally approved source in conjunction with the heater amperage rating Branch circuit wires should have a temperature rating no less than 75 C For convenience portions of the wire size tables from the code are reproduced here It is suggested the electrician size the branch circuit at 125 of the heater ampere rating and further increase wire size as necessary to compensate for voltage drop in lon
25. T TEMPERATURES ARE NECESSARY OBTAIN ADEQUATE BOOSTER OUTPUT ADD AN ANTI SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES TWO HEATERS WITH HORIZONTAL STORAGE TANK WITH OR WITHOUT BUILDING RECIRCULATION VACUUM RELIEF VALVE INSTALL PER LOCAL CODES HOT WATER SS TO FIXTURES THERMOMETER CIRCULATING PUMP WIRING DIAGRAM RELIEF TANK TEMPERATURE VALVE CONTROL TANK TEMP CONTROL duran 170 F MAX CIRCULATING li NEUTRAL LAI STORAGE TANK SAME SIZE INSERTA 229 PIPE AS COLD SUPPLY BEFORE BRANCH TO FIRST HEATER bs RETURN LINE FROM FIXTURE CIRCULATING LOOP IF USED 11 2 11 4 OPENING SEE NOTE INSTALL THERMAL EXPANSION TANKONCOLD WATER SUPPLY LINE IF CHECK VALVE OR PRESSURE REDUCING VALVE 15 USED SUPPLY GATE DISCONNECT VALVE SWITCH NO 150 ALL BRONZE CIRCULATING PIPE RELIEF VALVE TO OPEN DRAIN PUMP 1TANK TEMPERATURE CONTROL SET AT DESIRED TEMPERATURE MAX 170 F HEATER THERMOSTAT Bow SET AT LEAST 5 HIGHER REGULATING HEAT TRAP TO PLUG COCK INSTALL IN ACCORDANCE WITH ALL LOCAL CODES APPROXIMATELY MID POINT OF HEATER CAUTION IF BUILDING COLD WATER SUPPLY HAS A BACK FLOW PREVENTER CHECK VALVE OR WATER METER WITH CHECK VALVE PROVISIONS FOR THERMAL EXPANSION OF WATER IN THE HOT WATER SYSTEM MUST BE PROVIDED COLD WATER SUPPLY SIZED TO MEET APPLIC ATION AND CODE CONDITIONS SEE INSERT A amp B NOTE HEATER BRAN
26. ULATING RETURN LINE CONNECTIONS TEMPERED WATER LOOP IF USED CONNECT TO POINT R FLOW REGULATING CIRCULATING PUMP WIRING DIAGRAM JA PLUGCOCK LINE TEMPERATURE CONTROL L1 CIRCULATING 120VAC PUMP NEUTRAL TEMPERATURE AND ALL MANIFOLDING MUST BE EQUAL LENGTH HEATER NO 1 CAUTION IF BUILDING COLD WATER SUPPLY HAS A BACK FLOW PREVENTER CHECK VALVE OR WATER METER WITH CHECK VALVE PROVISIONS FOR THERMAL EXPANSION OF WATER IN THE HOT WATER SYSTEM MUST BE PROVIDED HEATER PIPE TO OPEN DRAIN INSTALL IN ACCORDANCE WITH ALL LOCAL CODES 1 1 4 OPENING INSERTB MUST BE IDENTICAL HEATERS A DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE AT FIXTURES SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 6 IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT ADD AN ANTI SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES VACUUM RELIEF VALVE INSTALL PER LOCAL CODES THREE HEATERS WITH OR WITHOUT MIXING VALVE WITH OR WITHOUT BUILDING RECIRCULATION INSTALL THERMAL EXPANSION TANK ONCOLD WATER SUPPLY LINE IF CHECK VALVE OR MIXING VALVE APPLICATION FOR TWO TEMPERATURE WATER PRESSURE REDUCING VALVE IS USED IN SUPPLY HOT WATER OUTLET 4 RETURN LINE FROM CIRCULATING WATER OUTLET M 4 LOOP FOR STORED TEMPERATURE 3 WATER IF USED LINE TEMPERATURE CONTROL TEMPERATURE AND PRESSURE RELIEF VALVE CHE
27. WATER SUPPLY HAS A BACK FLOW VALVE PREVENTER CHECK VALVE OR WATER METER WITH CHECK VALVE PROVISIONS FOR THERMAL EXPANSION OF WATER IN THE HOT WATER SYSTEM MUST BE PROVIDED THERMOMETER FUSED GATE DISCONNECT amp VALVE SWITCH RELIEF STORAGE TANK FLOW REGULATING Nis RELIEF 1 1 4 OPENING PLUG COCK VALVE SEE NOTE 9 9 CHECK E VALVE QI 22 5 fj d 1 2 ALL BRONZE Mm diy CIRCULATING 14 PUMP NU HEATER U No 1 DRAIN TEMP i VALVE CONTROL 170 F MAX PIPE RELIEF VALVE TO OPEN DRAIN E Q NO 3 1TANK TEMPERATURE CONTROL SET AT DESIRED TEMPERATURE a J MAX 170 F HEATER THERMOSTAT SET AT LEAST 5 HIGHER a HEATER A CIRCULATING PUMP WIRING DIAGRAM TANK TEMPERATURE NOTE CONTROL BRANCH PIPING TO ALL HEATERS MUST BE SAME SIZE AND LENGTH COLD WATER SUPPLY FOR EQUAL FLOW THESE BRANCHES MAY BE SIZED UP TO 1 1 4 SO SIZED TO MEET APPLICATION THAT CROSS SECTIONAL AREAS OF ALL INLETS AND OUTLETS AT AND CODE CONDITIONS L1 LEAST EQUAL AREA OF THEIR RESPECTIVE MAIN PIPING SEE INSERT amp B 120V AC CIRCULATING NEUTRAL REVERSE RETURN PIPING SHOWN 4 DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE AT INSERT A 29 FIXTURES SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 6 IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT
28. Y 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 26 A O Smith Water Heaters McBee South Carolina 29101 Phone 1 800 527 1953 Fax 800 433 2515 www hotwater com e mail parts hotwater com
29. akage may result in property damage even with the use of a drain pan piped to a drain However unanticipated damage can be reduced or prevented by a leak detector or water shut off device used in conjunction with a piped drain pan These devices are available from some plumbing supply wholesalers and retailers and detect and react to leakage in various ways Sensors mounted in the drain pan that trigger an alarm or turn off the incoming water to the water heater when leakage is detected Sensors mounted in the drain pan that turn off the water supply to the entire home when water is detected in the drain pan Water supply shut off devices that activate based on the water pressure differential between the cold water and hot water pipes connected to the water heater Devices that will turn off the gas supply to a gas water heater while at the same time shutting off its water supply SMALL CHILDREN TO USE A HOT WATER TAP OR TO DRAW THEIR OWN BATH WATER NEVER LEAVE A CHILD OR DISABLED PERSON UNATTENDED IN ABATHTUB OR SHOWER THE WATER HEATER SHOULD BE LOCATED IN AN AREA WHERE THE GENERAL PUBLIC DOES NOT HAVE ACCESS TO SET TEMPERATURES SETTING THE WATER HEATER TEMPERATURES AT 120 F WILL REDUCE THE RISK OF SCALDS Some states require settings at specific lower temperatures The water temperature is controlled in the DVE models with a single thermostat located on the right front of the heater just inside the control cabi
30. an gasket seating areas and thent with new gasket id dripping may appear on pipes mperature is low Pipe fitting may Drain valve le Either correct the problem or replace the valve TO check for 3 where threaded portion enters tank it the heater bottom or on the aused by condensation loose insert Q tip or similar absorbent material between All wat jacket opening valve to swab spud area Remove A valve if leak iration and leakage Do not replace compound the heater until a inspection of all potential leak points is made and corrective steps taken to stop the leak Leakage from Contact your dealer as it is necessary to shut off other appliances water lines or ground seepage should also electricity and drain tank to perform procedure be suspected until proved otherwise 25 Limited Warranty A O Smith Corporation the warrantor extends the following LIMITED WARRANTY to the owner of this water heater 1 THE TANK If the glass lined tank in this water heater shall prove upon examination by the warrantor to have leaked due to natural corrosion from potable watertherein during the first THREE 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 equivalen
31. ces WATER LINE CONNECTIONS This manual provides detailed installation diagrams see back section of this manual for typical methods of application for the water heaters The water heater may be installed by itself or with a separate storage tank on both single and two temperature systems When used with a separate storage tank the circulation may be either by gravity or by means of a circulating pump When a circulating pump is used it is important to note that the flow rate should be slow so that there will be a minimum of turbulence inside the heater caution A closed system will exist if a check valve pressure reducing valve or a water meter is installed in the cold water line between the water heater and street main or well Excessive pressure may develop causing premature tank failure or intermittent relief valve operation This type of failure is not covered by the limited warranty An expansion tank may be required in the inlet supply line between the appliance and the meter or valve to compensate for the thermal expansion of water If a water heater is installed in a closed water system contact the water supplier or local plumbing inspector on how to control this situation RELIEF DEVICES A CAUTION TO REDUCE THE RISK OF EXCESSIVE PRESSURES AND TEMPERATURE IN THIS WATER HEATER INSTALL TEMPERATURE AND PRESSURE PROTECTIVE EQUIPMENT REQUIRED BY LOCAL CODES but not less than a combination temperature and pressure
32. ct blue wires and yellow wires from terminal L3 2 Reconnect all blue wires to terminal L1 with black wires 3 Reconnect all yellow wires to terminal L2 with red wires 4 Connect incoming power to terminals L1 and L2 Thermostat operation be checked by a manually operating thermostat s and b allowing the heater to come up to temperature and shut off automatically 6 Close the front panel HIGH TEMPERATURE LIMITING DEVICE The heater control circuit contains a high temperature cutoff switch This device automatically shuts off the heating elements if excessive water temperatures near the steam point are reached The high temperature cutoff contacts open at 190 F and must be manually reset after a 30 F drop in water temperature DRAINING 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 heater 1 Turn off the electrical disconnect switch 2 Close the supply water inlet valve to heater Attach hose to outlet opening of drain valve and direct end to drain Open a nearby hot water faucet and the heater drain valve If the heater is being drained for an extended shutdown it is suggested the drain valve be left open during this period The hose may be removed Follow FILLING instructions when restoring hot water service CIRCULATING PUMP Where the water heating system includes
33. d flushing Close heater drain valve and remove hose Turn on electricity 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 In time if not removed the level of sediment might reach the heating elements and cause their failure For convenience sediment removal and element lime scale removal should be performed at the same time as follows LIME SCALE REMOVAL Lime scale accumulations on the heating elements is a normal condition common to all immersion type elements Factors which affect the amounts 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 2 Some of the electrical components of the water heater make sounds which are normal Contactors will click or snap as the heater starts and stops Transformers and contacts often hum Water leakage is suspected Refer to Leakage Checkpoint of following page 1 Check to see if the heater drain valve is tightly closed 2 If the outlet of the relief valve is leaking it may represent Excessive water temperature Faulty relief valve Excessive water pressure 3 Excessive wa
34. g runs Branch circuit voltage drop should not exceed 3 at the heater TABLE 310 16 Allowable Ampacities of Insulated Conductors Not more than three conductors in raceway cable or earth directly buried based on ambient temperature of 30 C 86 F Temperature Rating of Conductor See Table 310 13 Size 60 C 75 C 85 C 90 C 60 C 75 C 85 C 90 C K 140 F 167 F 185 F 194 140 F 167 F 185 194 TYPES TYPES TYPES TYPES V TA TBS RUW T RH RHW V MI TA TBS SA AVB SA AVB SIS FEP SIS FEPB RHH RHH THHN 1 XHHW Ambient Temp C 123 141 142 158 159 176 The load current rating and the overcurrent protection for these conductors shall not exceed 15 amperes for 14 AWG 20 amperes for 12 AWG 30 amperes for 10 AWG copper or 15 amperes for 12 AWG and 25 amperes for 10 AWG aluminum and copper clad aluminum For dry locations only See 75 C column for wet locations 15 i E Full I Current in Am esPhase Number of Element Elements Wattage 208 i 13 5 15 18 18 24 27 30 36 36 40 5 45 54 240V 480V 7 2 10 8 14 4 16 2 18 0 21 7 The following describes the heater circuits and includes wiring diagrams All heater circuits are designed for 50 60 cycle alternating current CONTROL CIRCUIT DVE MODELS The heater is equipped with one of the following 120V control circuits resulting
35. in e Simultaneous element operation where all of the heating elements are operated by one thermostat This is the standard circuit and may be used with up to nine elements Sequenced element operation where each row of three elements are operated by its own thermostat This is an optional circuit and may be used with six or nine elements The control circuit is operated on single phase 120V current obtained from the control transformer or as shown in the wiring diagram Beginning at the fuse block control circuit wiring is 14 Awg AWM Appliance wiring material type rated 600 volts 105 C Standard equipment includes control circuit fusing using two 3 amp class G fuses with 600 volt rating Do not substitute fuses of a different rating AMPERAGE TABLE OVERCURRENT PROTECTION The table above provides the total connected heating element load in amperes for branch circuit conductor and overcurrent protection sizing Single phase heaters are two wire circuits Three phase heaters are three wire circuits In addition to the foregoing a grounded conductor is required The rating of the overcurrent protection must be computed on the basis of 125 of the total connected load amperage Where the standard ratings and settings do not correspond with this computation the next higher standard rating or setting should be selected HEATER CIRCUITS DVE MODELS The water heater s electrical components are pictured and identified
36. is completed 9 Remove sediment and scale from the tank bottom through the access provided by the element openings or drain valve opening The cold water inlet valve and drain valve may be opened to aid the cleanout process 10 Clean remaining gasket material from tank and element flanges Do not reuse original element gaskets 11 Put new gaskets on each element and install into tank openings Uniformly tighten element bolts Torque to approximately 32 ft Ibs 23 MAINTENANCE SCHEDULE Component Operation Interval Required Flushing Periodically UneLime delimer amp element gaskets Part pesce 20 28 p Tank flushing should be performed in accordance with the above schedule Tank sediment removal and element lime scale removal must be performed as needed as determined by periodic inspection Following are the instructions for performing recommended maintenance Elements Lime Scale Removal As needed FLUSHING The water heater drain valve should be opened periodically to help prevent sediment buildup on the tank bottom 1 Turn off the electrical disconnect switch 2 Attach hose to outlet opening of drain valve and direct end to drain Open the drain valve by turning the hand wheel to the left counterclockwise Allow water to flow until it runs clean If water does not flow from opened drain valve follow instructions for sediment removal When finishe
37. led in its original installation location sized in accordance with proper sizing techniques for commercial water heaters bearing a rating plate which has not been altered defaced or removed except as required by the warrantor 0 not used in a closed system without a properly sized and installed thermal expansion tank 1 fired at the proper voltage and wattage 12 maintained in accordance with the instructions printed in the manual included with the heater b 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 3 4 5 6 7 8 9 1 1 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 repair 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 me
38. net This control is set at 140 F at the factory and has a fixed 5 F differential The DRE models have multiple thermostats depending on the configuration purchased These thermostats are also set at 140 F and have a 5 15 F differential A O Smith recommends setting the dial at the lowest setting which produces an acceptable hot water supply This will always give the most energy efficient operation Figure 1 shows the approximate time to burn relationship for normal adult skin Valves for reducing point of use temperature by mixing cold and hot water are available Also available are inexpensive devices that attach to faucets to limit hot water temperatures Contact a licensed plumber or the local plumbing authority Ol DRE MODELS DVE MODELS Temperature Time to produce 2nd amp 3rd Setting Degree burns on adult skin 180 F Nearly instantaneous 170 F Nearly instantaneous 160 F About 1 2 second 150 F About 1 1 2 seconds 140 F Less than 5 seconds 130 F About 30 seconds 120 F More than 5 minutes FIGURE 1 The pressure setting of the relief valve should not exceed the pressure capacity of any component in the system The temperature setting of the relief valve should not exceed 210 F An unplugged 3 4 relief valve opening is provided for installing temperature and pressure relief valve TEMPERATURE LIMITING CONTROL S Both the DVE and DRE model water heaters incorporate high temperature cutoffs In
39. operating the heater TEMPERATURE REGULATION DANGER A DANGER THIS WATER HEATER IS EQUIPPED WITH AN ADJUSTABLE THERMOSTAT TO CONTROL WATER TEMPERATURE HOT WATER TEMPERATURES REQUIRED FOR AUTOMATIC DISHWASHER AND LAUNDRY USE CAN CAUSE SCALD BURNS RESULTING IN SERIOUS PERSONAL INJURY AND OR DEATH THE TEMPERATURE AT WHICH INJURY OCCURS VARIES WITH THE PERSONS AGE AND TIME OF EXPOSURE THE SLOWER RESPONSE TIME OF CHILDREN AGED OR DISABLED PERSONS INCREASES THE HAZARDS TO THEM NEVERALLOW TEMPERATURE CONTROL THERMOMETER Piping Diagrams ONE TEMPERATURE WITH CIRCULATING LOOP BOOSTER WITH CIRCULATING LOOP SHUTOFF VALVE THERMOMETER PREHEATED WATER INLET A FUSED DISCONNECT COLD SWITCH WATER SUPPLY TEMP amp PRESS RELIEF VALVE TO OPEN DRAIN PLUG COCK CIRCULATING LOOP LINE TEMPERATURE MIXING VALVE APPLICATION FOR TWO TEMPERATURE WATER HOT WATER OUTLET TEMPERED WATER OUTLET CHECK VALVE N MIXING VALVE CHECK VALVE CIRCULATING RETURN LINE CONNECTIONS TEMPERED WATER LOOP IF USED CONNECT TO POINT R ONE TEMPERATURE THERMOMETER 1 1 4 OPENING HOT WATER OUTLET FUSED 4 p DISCONNECT ATER INLET SWITCH INSERT amp B E di 180 F OUTLET NEU LOOP TO VICINITY WATER OF DISHWASHER TEMP 8 PRESS RELIEF VALVE RETURN LINE FROM CIRCULATING LOOP FOR STORED TEMPERATURE WATER IF USED HE
40. part desired Standard hardware items should be purchased locally 12 Attach element wires to connection points from which they were removed 13 Follow FILLING instructions to restore hot water service Check for water leaks around elements and proper operation when heater is filled Close the front panel 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 2 identifies the location of all of the heater components BE SURE TO TURN OFF THE ELECTRICITY WHEN CHECKING EQUIPMENT Not enough or no hot water 1 the electrical disconnect switch serving the water heater is in the ON position 2 Check the fuses The electrical disconnect switch usually contains fuses The heater has fusing 3 If the water was excessively hot and is now cold the high limit switch may have operated To reset open the front panel and push the reset button Repeated operation of the high temperature cutoff should be investigated by your dealer 4 The capacity of the heater may have been exceeded by a large demand for hot water Large demands require a recovery period to restore water temperature 5 Cooler incoming water temperature will lengthen the time required to heat water to the desired
41. rchantability 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 U S Customers Canadian Customers A O Smith Water Products Company A O Smith Enterprises Ltd 500 Tennessee Waltz Parkway P O Box 310 768 Erie Street Ashland City TN 37015 Stratford Ontario N5A 6T3 Telephone 1 800 323 2636 Telephone 1 800 265 8520 a warrantor will only honor replacement with identical or similar water heater or parts thereof which are manufactured or 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 WARRANTOR 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 PROPERT
42. t is scaled all of the elements should be removed and cleaned If the tank bottom has an accumulation of sediment it should be cleaned Lime scale should be removed by dissolving the accumulation in UNeLIME delimer UN LIME is a non muriatic delimer available from Product Service Division A O Smith Water Heater Parts Fulfillment 125 Southeast Parkway Franklin TN 37068 Do not use muriatic or hydrochloric acid base deliming solutions to remove lime scale from the elements Replacement gaskets part no 9000308 should be available at this time 1 Turn off electrical disconnect switch 2 Drain the heater following DRAINING instructions Open front panel Disconnect the element wiring Try not to disturb the wiring unnecessarily and reconnection will be easier Unscrew each element Remove the elements and gaskets from the openings Use a twisting pulling action to remove elements scaled beyond the size of the tank openings Brush loose scale from elements Lime scale removal Place limed ends of heating elements into UNeLIME delimer and allow scale to dissolve Do not permit delimeror water to contact heating element electrical terminals Other scale removal Silicates sulfates and aluminates must be removed by scraping or other mechanical means Lime scale dissolvents will not remove these types of scale which are occasionally encountered 8 Flush cleaned ends of elements with water when deliming or cleaning
43. t pipe valve allowing the heater and piping to be filled Close the hot water faucet as water starts to flow The heater is now ready for STARTUP and TEMPERATURE REGULATION STARTUP The following checks should be made by the installer when the heater is placed into operation for the first time 1 Turn off the electrical disconnect switch 2 Open the front panel check all water and electrical connections for tightness Also check connections on top and side of heater Repair water leaks and tighten electrical connections as necessary 3 Depress red button on manual reset high limit switches 4 on the electrical disconnect switch 5 Observe the operation of the electrical components during the first heating cycle Use care as the electrical circuits are energized Maintenance GENERAL Periodically the drain valve should be opened and the water allowed to run until it flows clean This will help to prevent sediment buildup in the tank bottom Periodically check the temperature and pressure relief valve 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 4 CAUTION THE WATER PASSING OUT OF THE VALVE DURING THIS CHECKING OPERATION MAY BE EXTREMELY HOT Lime scale accumulations may cause noises to occur during operation It is recommended that a heating element be removed periodically for examination If i
44. t 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 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 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 when filled with potable water free to circulate at all times in a noncorrosive and non contaminated atmosphere in the United States its territories or possessions and Canada used with factory approved anode s instal
45. ter on page 2 for identification of components mentioned below Failure to follow these instructions can result in fire asphyxiation serious personal injury or death Do not cover the temperature amp pressure relief valve Do not cover the instruction manual Keep it on the side of the water heater or nearby for future reference Do obtain new labels from A O Smith for placement on the blanket directly over the existing labels 4 WARNING FAILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT IN SERIOUS PERSONAL INJURY OR DEATH Foreword Detailed installation diagrams are in this manual These diagrams will serve to provide the installer with a reference for the materials and method of piping suggested IT IS NECESSARY THAT ALL WATER PIPING AND THE ELECTRICAL WIRING BE INSTALLED AND CONNECTED AS SHOWN IN THE DIAGRAMS Particular attention should be given to the installation of thermometers at the locations indicated in the diagrams as these are necessary for checking the operation of the heater In addition to these instructions the equipment shall be installed in accordance with those installation regulations in force in the local area where the installation is to be made Authorities having General 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 and any gas
46. ter 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 may consist of e Installation of a second relief valve set lower than the primary safety relief valve An expansion tank of suitable pressure and provision to avoid water logging Removal of the check valve 4 Examine the area around the element for gasket leakage Tighten the elements or if necessary follow the WATER AND LIME SCALE REMOVAL procedure to replace the gaskets IF YOU CANNOT IDENTIFY OR CORRECT THE SOURCE OF MALFUNCTION 1 Place the water heater electrical switch in the OFF position 2 Close the supply water inlet valve to the heater 3 Contact your dealer REPLACEMENT PARTS Replacement parts may be ordered through dealers authorized servicers or distributors Refer to Yellow Pages for where to call or contact the Product Service Division A O Smith Water Heater Parts Fulfillment 125 Southeast Parkway Franklin TN 37068 1 800 433 2545 When ordering parts specify complete model no serial no see rating plate quantity and name of
47. the event of high temperature cutoff operation the reason for the operation of the high temperature cutoff operation must be determined and corrected Once the situation has been corrected the high temperature cutoff s may be reset in the following manner DVE Models The DVE models have a single immersion type high temperature cutoff control in the control circuit see DVE CONTROL CIRCUIT DIAGRAMS This high temperature cutoff is factory set to open at 190 F 88 C To manually reset the control you must 1 Disconnect the power to the heater 2 Allow the tank to cool to approximately 120 F 3 Remove the front control cover 4 Press the manual reset button The control will not reset until it has cooled approximately 50 F 28 C DRE Models The DRE models have multiple surface mounted combination high temperature cutoff and thermostat controls There is one of these combination high temperature cutoff and thermostat controls for each element in a DRE model see DRE CIRCUIT DIAGRAMS Each of the high temperature controls is of the manual reset type To manually reset the controls Disconnect the power to the heater Allow the tank to cool approximately 160 F Remove the front control cover Press the manual reset button on each of the effected controls The control will not reset until it has cooled approximately 30 F 17 C PO Once the control s has been reset the control cover should be replaced prior to
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