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A.O. Smith AOSRE50400 - page 1
1 PRI NTE D 0 707 1 8583 4-000 KEEP THIS MANUAL IN THE POCKET ON HEA TER FOR FUTURE REFERENCE WHEN EVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED. A L L TE C H N I C A L A N D W AR R A N T Y Q UE S T I O N S : S H O U L D B E DI R E C T E D T O TH E LO C A L D E A L E R F R O M W H O M TH E W A T E R H E A T E R W AS P U R C H A SE D. I F Y OU ...
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A.O. Smith AOSRE50400 - page 2
2 SAFE INST ALLA TION, USE AND SERVICE Y our 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 ...
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A.O. Smith AOSRE50400 - page 3
3 GENERAL SAFETY ...
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A.O. Smith AOSRE50400 - page 4
4 Thank Y ou for purchasing this water heater . Properly installed and maintained, it should give you years of trouble free service. Abbreviations Found In This Instruction Manual: • ANSI - American National Standards Institute • ASME - American Society of Mechanical Engineers • NEC - National Electrical Code • NFP A - National Fire Protect ...
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A.O. Smith AOSRE50400 - page 5
5 TYPICAL INST ALLA TION MIXING V AL VE USAGE FIGURE 2. W ater (Potable) Heating: All models are considered suitable for water (potable) heating only . H O T T E R W AT E R C A N S C A L D : W ater heaters are intended to produce hot water . W ater heated to a temperature which will satisfy space heating, clothes washing, dish was hi ng, and ot her ...
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A.O. Smith AOSRE50400 - page 6
6 F ACTS TO CONSIDER ABOUT THE LOCA TION Carefully choose an indoor location for the new water heater , bec aus e t he pla cem ent is a ver y i mpo rtan t c ons ide rati on fo r th e safety of the occupants in the building and for the most economical use of the appliance. Whether replacing an old water heater or putting the water heater in a new lo ...
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A.O. Smith AOSRE50400 - page 7
7 INST ALLING THE NEW W A TER HEA TER MOUNTING MOUNTING - DR YW ALL (HOLLOW W ALL) 1. The selected wall or cabinet must be capable of supportin g double the weight of the unit when completely full of water (77 Ibs). 2. The installation area must provide adequate clearances for removal of the front panel and servicing the unit. 3. Locate the wall st ...
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A.O. Smith AOSRE50400 - page 8
8 FIGURE 4. W A TER PIPING PRESSURE TEST This section is only for the manufacturer installing the water heater when the installation is to comply with H.U.D. Standards. When testing the water ways, H.U.D. Standards state: “W ater distribution system: All water piping in the water distribution system shall be subjected to a pressure test. The test ...
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A.O. Smith AOSRE50400 - page 9
9 This heater is provided with a properly certified combination temperature - pressure relief valve by the manufacturer . The valve is certified by a nationally recognized testing laboratory that maintains periodic inspection of production of listed equipment of materials as meeting the requirements for Relief V alves for Hot W ater Supply Systems, ...
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A.O. Smith AOSRE50400 - page 10
10 WIRING DIAGRAM FIGURE 5. ...
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A.O. Smith AOSRE50400 - page 11
1 1 WIRING Never use the water heater unless it is completely full of water . T o prevent damage to the tank and the heating element, the tank must be filled with water. Water must flow from the hot water faucet before turning on the power . Y ou must provide all wiring of the proper size outside of the water heater . Y ou must obey the local codes ...
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A.O. Smith AOSRE50400 - page 12
12 HOTTER W A TER CAN SCALD: Water heaters are intended to produce hot water. W ater 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 ...
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A.O. Smith AOSRE50400 - page 13
13 THERMAL EXP ANSION W ater supply systems may , because of such events as high line pr es su re , fre qu en t cut -o f fs , the ef f ec ts of wa ter ham me r amo ng ot he rs , ha ve ins ta l le d de vi ce s su ch as pr es su re red uc i ng va lv e s, ch ec k va lv es , bac k ow pre ven te rs, et c. to con tro l thes e type s of prob lem s. Whe ...
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A.O. Smith AOSRE50400 - page 14
14 no t ca us e an y p ro per ty dam ag e, as t he wat er may be ext re me ly h ot , se e F igu re 7. FIGURE 7. If after manually operating the valve, it fails to completely reset and continues to release water , immediately close the cold water inlet to the water heater , follow the draining instructions, and replace the temperature-pressure relie ...
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A.O. Smith AOSRE50400 - page 15
15 3. Using a Philips screwdriver , unscrew the bottom screw securing the outer door , see Figure 8. 4. Lift up and remove front panel. FIGURE 8. THERMOST A T REMOV AL / REPLACEMENT REMOVAL 1. Turn of f and unplug the water heater from the electrical outlet. 2. Remove the front panel, see the “REMOVING THE FRONT P ANEL” section in this manual. ...
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A.O. Smith AOSRE50400 - page 16
16 wate r inlet and out let, open the neares t hot water tap and follow ll in g in str uct ion s. Never use this water heater unless it is completely full of water . T o prevent damage to the tank and heating element, the tank must be lled with water . Water must ow from the hot water faucet before turning “ON” power . The manufacturer ...
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A.O. Smith AOSRE50400 - page 17
17 LEAKAGE CHECKPOINTS Read this manual rst. Make sure the electrical power supply has been turned “OFF” before checking the tank for leakage. *A. Condensation and dripping may be seen on pipes if the water temperature is low in humid weather or pipe connections may be leaking. B. Small amounts of water from temperature-pressure relief valve ...
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A.O. Smith AOSRE50400 - page 18
18 T ighten threaded connections. Inspect other appliances near water heater . T urn on electrical switch. Check for blown fuses or tripped breaker . Re s et . Ch ec k f o r so u rc e of tr o ub l e and co r re c t. Replace thermostat. Replace thermostat. Replace thermostat. Set thermostat to desired temperature. Drain. Determine if water treatment ...
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A.O. Smith AOSRE50400 - page 19
19 REP AIR P ARTS LIST FIGURE 13. 1 Element Gasket 2 Anode Rod 3 Element Assembly with Gasket, Anode & Fasteners 4 High Limit with Personnel Barrier 5 - 6 T emperature Sensor and Thermostat 7 Mounting Bracket 8 Front Panel 9 T emperature Control Knob 10 Heat T raps 1 1 Dip T ube 12 T emperature-Pressure Relief V alve *13 Element Bolts 14 Person ...
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A.O. Smith AOSRE50400 - page 20
20 RESIDENTIAL ELECTRIC W ARRANTY THIS W ARRANTY IS APPLICABLE TO THE ORIGINAL OWNER ONL Y . In accordance with the warranty terms and conditions specied below . A. O. Smith Corporation (the warrantor) will furnish the ORIGINAL OWNER, 1) a replacement A. O. Smith water heater of equivalent size and current model if the glasslined tank in this wa ...
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A.O. Smith AOSRE50400 - page 21
21 wit hout inva lida ting the rema inde r of the af fect ed provis ion or the other provisions of this warranty . SERVICE AND LABOR RESPONSIBILITY UND ER THIS LIMI TED W ARR ANTY , THE W ARR ANT OR WILL PROVIDE ONL Y A REPLACEMENT WA TER H E AT E R O R PA R T T H E R E O F . T H E O W N E R I S RESPONSIBLE FOR ALL OTHER COSTS. Such costs may inclu ...
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A.O. Smith AOSRE50400 - page 22
22 NOTES: ____________________________________________________ ____________________________________________________ ____________________________________________________ ____________________________________________________ ____________________________________________________ ____________________________________________________ ______________________ ...
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A.O. Smith AOSRE50400 - page 23
23 NOTES: ____________________________________________________ ____________________________________________________ ____________________________________________________ ____________________________________________________ ____________________________________________________ ____________________________________________________ ______________________ ...
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A.O. Smith AOSRE50400 - page 24
24 www .aosmithwaterheaters.com ...
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