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Instruction Manual
RESIDENTIAL ELECTRIC
WATER HEATERS
FOR POTABLE WATER
HEATING ONLY
NOT SUITABLE FOR
SPACE HEATING
LISTED
GAMA certification applies to all
residential electric water heaters
with capacities of 20 to 120 gallons.
Input rating of 12 Kw or less.
ALL TECHNICAL AND WARRANTY QUESTIONS: SHOULD BE DIRECTED TO THE LOCAL DEALER FROM WHOM THE WATER HEATER WAS
PURCHASED. IF YOU ARE UNSUCCESSFUL, PLEASE WRITE TO THE COMPANY LISTED ON THE RATING PLATE ON THE WATER HEATER.
KEEP THIS MANUAL IN
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SAFE INSTALLATION, USE AND SERVICE Your safety and the safety of others is extremely important in the installation, use and servicing of this water heater. Many safety-related messages and instructions have been provided in this manual and on your own water heater to warn you and others of a potential injury hazard. Read and obey all safety messages and instructions throughout this manual. It is very important that the meaning of each safety message is understood by you and others who install,
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GENERAL SAFETY TABLE OF CONTENTS SAFE INSTALLATION, USE AND SERVICE .............................. 2 Temperature Adjustment ................................................ 11 GENERAL SAFETY .................................................................. 3 FOR YOUR INFORMATION ..................................................... 12 TABLE OF CONTENTS .............................................................. 3 Thermal Expansion ......................................................... 12
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INTRODUCTION Thank You for purchasing this water heater. Properly installed and 2. The installation must conform with these instructions and the local maintained, it should give you years of trouble free service. code authority having jurisdiction and the requirements of the power company. In the absence of code requirements follow NFPA-70 Abbreviations Found In This Instruction Manual: (latest edition). The National Electric Code which may be ordered from: National Fire Protection Association,
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TYPICAL INSTALLATION LOWBOYS UPRIGHTS COMPACTS TABLE TOPS INSTALL SUITABLE DRAIN PANS UNDER HEATERS TO PREVENT DAMAGE DUE TO LEAKAGE. REFER TO WATER HEATER LOCATION ON PAGE 8. INSTALL VACUUM RELIEF IN COLD WATER INLET LINE AS REQUIRED BY LOCAL CODES. INSTALL THERMAL EXPANSION TANK OR DEVICE IF WATER HEATER IS INSTALLED IN A CLOSED WATER SYSTEM. FIGURE 1. 5
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WIRING DIAGRAMS TURN OFF THE HEATER ELECTRICAL SUPPLY BEFORE SERVICING ANY ELECTRICAL COMPONENTS. C-2 A-9 TWO WIRE CIRCUIT FOR SINGLE 240 VOLT “OFF PEAK” NON-SIMULTANEOUS ELEMENT HEATERS EQUIPPED OPERATION BOTTOM ELEMENT ON SEPARATE WITH HIGH LIMIT CONTROL TIME CLOCK OR “OFF PEAK” METER S-1 THREE WIRE CIRCUIT FOR ELECTRIC CO. CO-OP PROGRAMS A-6 TWO WIRE CIRCUIT FOR NON-SIMULTANEOUS OPERATION, HAS SINGLE HIGH LIMIT CONTROL FIGURE 2. 6
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MIXING VALVE USAGE FIGURE 3. Water (Potable) Heating: All models are considered suitable for HOTTER WATER CAN SCALD: water (potable) heating only. 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
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LOCATING THE NEW WATER HEATER damage to the structure. For this reason, it is not advisable to install the FACTS TO CONSIDER ABOUT THE LOCATION water heater in an attic or upper floor. When such locations cannot be avoided, a suitable drain pan should be installed under the water heater. Drain pans are available from your local plumbing contractor. Such a drain pan must have a minimum length and width of at least 2 inches (51 mm) greater that the water heater dimensions and must be piped to a
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The water within the water heater tank expands as it is heated and TEMPERATURE-PRESSURE RELIEF VALVE increases the pressure of the water system. If the relieving point of the water heater’s temperature-pressure relief valve is reached, the valve will relieve the excess pressure. The temperature-pressure relief valve is not intended for the constant relief of thermal expansion. This is an unacceptable condition and must be corrected. It is recommended that any devices installed which could cre
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The Discharge Pipe: If after manually operating the valve, it fails to completely reset and continues to release water, immediately close the cold water inlet to • Shall not be smaller in size than the outlet pipe size of the valve, or the water heater, follow the draining instructions, and replace the have any reducing couplings or other restrictions. temperature-pressure relief valve with a new one. • Shall not be plugged or blocked. FILLING THE WATER HEATER • Shall be of material listed for h
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TEMPERATURE REGULATION KEEPING THE THERMOSTAT SETTING AT 120°F WILL REDUCE THE Due to the nature of the typical water heater, the water temperature in RISK OF SCALDS. certain situations may vary up to 30°F (16.7 °C) higher or lower at the point of use such as, bathtubs, showers, sink, etc. Figure 7 shows the approximate time-to-burn relationship for normal adult skin. The thermostats on your water heater have a linear Any water heater’s intended purpose is to heat water. Hot water is relations
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FOR Y FOR Y FOR YOUR INFORMA OUR INFORMA OUR INFORMATION TION TION FOR Y FOR YOUR INFORMA OUR INFORMATION TION THERMAL EXPANSION c. A sulfate reducing bacteria which has accumulated within the water heater (this harmless bacteria is nontoxic to humans). d. An excess of active hydrogen in the tank. This is caused by the corrosion protective action of the anode. Smelly water may be eliminated or reduced in some water heater models by replacing the anode(s) with one of less active material, and th
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anode rod can extend the life of your water heater. Inspection should The water heater should be drained if being shut down during freezing be conducted by a qualified technician, and at a minimum should be temperatures. Also periodic draining and cleaning of sediment from the checked annually after the warranty period. tank may be necessary. 1. Turn electrical supply “OFF”. TEMPERATURE-PRESSURE RELIEF VALVE OPERATION 2. CLOSE the cold water inlet valve to the water heater. 3. OPEN a nearby hot
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LEAKAGE CHECKPOINTS Read this manual first. Then before checking the water heater make B 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 A A temperature is low in humid weather or pipe connections may be leaking. *B. The anode rod fitting may be leaking. C. Small amounts of water from temperature-pressure relief valve may be due to thermal expansion or high water pressure in your D area.
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REPAIR PARTS LIST Key No. Part Description 11 1 Upper Heating Element (If Dual Element Unit) 8 2 Lower Heating Element 3 Element Gasket 4 Lower Thermostat (If Dual Element Unit) 12 5 Upper Thermostat w/ECO (If Dual Element Unit) 14 14 6 Lower Thermostat w/ECO (If Single Element Unit) 7 Outer Door(s) 8 Inlet Tube 9 Drain Valve 10 Drain Valve Washer 11 Anode Rod 12 Anode Outlet/Heat Trap (If Applicable) 13 Temperature-Pressure Relief Valve 14 External Heat Trap Nipples (If Applicable) 16 15 Pip
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TROUBLESHOOTING GUIDELINES These guidelines should be utilized by a qualified service agent. Problem Cause Solution Improperly sealed, hot or cold supply connection, Tighten threaded connections. WATER LEAKS relief valve or drain valve. (See Leakage Checkpoints on 14) Leakage from other appliances or water lines. Inspect other appliances near water heater. Thermal expansion in closed water system. Instal
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RESIDENTIAL ELECTRIC WARRANTY THIS WARRANTY IS APPLICABLE TO THE ORIGINAL This warranty shall apply only when the heater is: OWNER ONLY. In accordance with the warranty terms and conditions specified below. • owned by the original purchaser; • installed for indoor operation only; A. O. Smith Water Heaters (the warrantor) will furnish the • used at temperatures not exceeding the maximum ORIGINAL OWNER, 1) a replacement A. O. Smith water calibrated setting of its thermostat; heater of equivalent
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without invalidating the remainder of the affected provision Dealer replacements are made subject to in-warranty validation by warrantor. or the other provisions of this warranty. SERVICE AND LABOR RESPONSIBILITY PROOF OF PURCHASE AND PROOF OF INSTALLATION DATE ARE REQUIRED TO SUPPORT WARRANTY UNDER THIS LIMITED WARRANTY, THE WARRANTOR CLAIM FROM ORIGINAL OWNER. THIS FORM DOES WILL PROVIDE ONLY A REPLACEMENT WATER NOT CONSTITUTE PROOF OF PURCHASE OR PROOF HEATER OR PART THEREOF. THE OWNER IS O
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NOTES: ___________________________________________________ ___________________________________________________ ___________________________________________________ ___________________________________________________ ___________________________________________________ ___________________________________________________ ___________________________________________________ ___________________________________________________ ___________________________________________________ _________________________
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www.aosmithwaterheaters.com 20
