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A.O. Smith ECT-120 - page 1
1 PRINTED IN THE U.S.A 0207 P ART NO. 1 85762-000 SUPERSEDES P ART NO. 18 4 639-00 2 KEEP THIS MANUAL IN THE POCKET ON HEA TER FOR FUTURE REFERENCE WHEN EVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED. ALL TECHNICAL AND W ARRANTY QUESTIONS: SHOULD BE DIRECTED T O THE LOCAL DEALER FROM WHOM THE WA TER HEA TER WAS PURCHASED. IF YOU ARE UNSUCCESSFU ...
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A.O. Smith ECT-120 - page 2
2 SAFE INST ALLA TION, USE AND SERVICE Y our safety and the safety of others is extremely important in the inst allation, 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 ECT-120 - page 3
3 GENERAL SAFETY ...
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A.O. Smith ECT-120 - page 4
4 Thank Y ou for purchasing this water heater . Properly inst alled and maintained, it should give you years of trouble free service. Abbreviations Found In This Instruction Manual: • ANSI - American National S tandards Institute • ASME - American Society of Mechanical Engineers • GAMA - Gas Appliance Manufacturers Association • NEC - Natio ...
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A.O. Smith ECT-120 - page 5
5 TYPICAL INST ALLA TION FIGURE 1. UPRIGHT S / LOWB O YS COMP ACTS T ABLE TOPS INST ALL V ACUUM RELIEF IN COLD W A TER INLET LINE A S REQUIRED BY LOCAL CODES. INST ALL SUIT ABLE DRAIN P ANS UNDER HEA TERS TO PREVENT DAMAGE DUE TO LEAKAGE. REFER T O WA TER HEA T ER LOCA TION, SEE “INST ALLING THE NEW WA TER HEA TER” SECTION. INST ALL THERMAL EXP ...
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A.O. Smith ECT-120 - page 6
6 MIXING V AL VE USAGE W ater (Potable) Heating: All models are considered suitable for water (potable) heating only . HOTTER WA TER CAN SCALD: W ater 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 ...
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A.O. Smith ECT-120 - page 7
7 INST ALLING THE NEW W A TER HEA TER WA TER PIPING HOTTER W A TER CAN SCALD: W ater heaters are intended to produce hot water. W ater heated to a temperature which will satisfy space heating, clothes washing, dish washing, cleaning and other sanitizing needs can scald and permanently injure you upon cont act. Some people are more likely to be perm ...
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A.O. Smith ECT-120 - page 8
8 NOTE: T o protect against untimely corrosion of hot and cold water fittings, it is strongly recommended that di-electric unions or couplings be inst alled on this water heater when connected to copper pipe. Figure 3 shows the typical attachment of the water piping to the water heater . The water heater is equipped with 3/4 inch NPT water connecti ...
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A.O. Smith ECT-120 - page 9
9 TEMPERA TURE- PRESSURE RELIEF VAL V E 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 requirement s for Relief ...
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A.O. Smith ECT-120 - page 10
10 If after manually operating the valve, it fails to completely reset and continues to release water, immediately close the cold water inlet to the water heater , follow the draining instructions, and replace the temperature-pressure relief valve with a new one. FILLING THE WA TER HEA TER Never use this water heater unless it is completely full of ...
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A.O. Smith ECT-120 - page 11
11 WIRING DIAGRAMS FOR ACTUAL WIRING CIRCUIT OF UNIT - REFERENCE CIRCUIT TYPE LISTED ON RA TING PLA TE. FIGURE 6. ...
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A.O. Smith ECT-120 - page 12
12 WIRING Never use water heater unless it is completely full of water . T o prevent damage to the tank and heating element, the tank must be filled with water . W ater must flow from the hot water faucet before turning on power . Y ou must provide all wiring of the proper size outside of the water heater . Y ou must obey local codes and electric c ...
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A.O. Smith ECT-120 - page 13
13 TEMPERA TURE ADJUSTMENT T o change the temperature setting: NOTE: It is not necessary to adjust the upper thermostat. However , if it is adjusted above the factory set point (120°F (49°C)) it is recommended that it not be set higher than the lower thermostat setting. 1. T urn of f the heater electrical supply . Do not attempt to adjust thermos ...
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A.O. Smith ECT-120 - page 14
14 THERMAL EXP ANSION W ater supply systems may , because of such events as high line pressure, frequent cut-offs, the effects of water hammer among others, have installed devices such as pressure reducing valves, check valves, back flow preventers, etc. to control these types of problems. When these devices are not equipped with an internal by-pas ...
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A.O. Smith ECT-120 - page 15
15 If after manually operating the valve, it fails to completely reset and continues to release water, immediately close the cold water inlet to the water heater , follow the draining instructions, and replace the temperature-pressure relief valve with a new one. If the temperature-pressure relief valve on the appliance weep s or discharges periodi ...
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A.O. Smith ECT-120 - page 16
16 1. Turn “OFF” the electric power supply to the water heater . 2. Remove the outer door. Remove or fold up the insulation pad. 3. A. Models with lower thermost at without high limit: Lift out the tab as shown below to unclip the terminal cover from the thermostat. The terminal cover can now be removed from the thermost a t. FIGURE 10. B. Mode ...
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A.O. Smith ECT-120 - page 17
17 The water passing out of the drain valve may be extremely hot. T o avoid being scald, make sure all connections are tight and that the water flow is directed away from any person. 4. Remove the screw(s) securing the outer door , and remove door . FIGURE 14. 5. Remove or fold up the insulation. FIGURE 15. 6. A. Models with lower thermost at witho ...
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A.O. Smith ECT-120 - page 18
18 1 1. Close the water heater drain valve by turning the handle to the right (clockwise). The drain valve is on the lower front of the water heater . 12.Open the cold water supply valve to the water heater . NOTE: The cold water supply valve must be lef t open when the water heater is in use. 13. T o insure complete filling of the tank, allow air ...
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A.O. Smith ECT-120 - page 19
19 LEAKAGE CHECKPOINTS Read this manual first. Then before checking the water heater make sure the electrical power supply has been turned “OFF” before checking the tank for leakage. *A. Condensation and dripping may be seen on pipes if the water temperature is low in humid weather or pipe connections may be leaking. *B. The anode rod fitting m ...
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A.O. Smith ECT-120 - page 20
20 T ighten threaded connections. Inspect other appliances near water heater . T urn on electrical switch. Check for blown fuses or tripped breaker. Reset. Check for source of trouble and correct. Replace thermostat. Replace thermostats. Replace element. Replace thermostats. Set thermostats to desired temperature. Drain. Determine if water treatmen ...
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A.O. Smith ECT-120 - page 21
21 REP AIR P ARTS LIST LOWBOY AND UPRIGHT ELECTRIC MODELS (Single and Dual Element) Key No. Part Description 1 T emperature-Pressure Relief Valve 2 Secondary Anode Rod/Nipple w/Heat T rap* 3 Element w/Gasket 4 Element Gasket 5 Lower Outer Door 6 T erminal Cover (Double Element) 7 Upper Thermostat w/Hi Limit (Double Element) 8 T erminal Cover 9 Lowe ...
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A.O. Smith ECT-120 - page 22
22 REP AIR P ARTS LIST WHEN ORDERING REP AIR P ARTS, AL W A YS GIVE THE FOLLOWING INFORMA TION: • MODEL NUMBER • SERIAL NUMBER • VOL T AGE AND ELEMENT W A TT AGE • P AR T DESCRIPTION THIS IS A REP AIR P ARTS LIST , NOT A P ACKING LIST . Now that you have purchased this water heater , should a need ever exist for repair part s or service, si ...
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A.O. Smith ECT-120 - page 23
23 REP AIR P ARTS LIST T ABLE TOP ELECTRIC MODELS Key No. Part Description 1 Porcelain T o p 2 T emperature and Pressure Relief V alve 3 Primary Anode Rod 4 Upper Thermostat w/Hi Limit 5 Dip T ube 6 Element w/Gasket 7 Element Gasket 8 Thermostat Bracket (ea.) 9 T erminal Cover 10 Outer Door (ea.) 1 1 Lower Thermostat w/Hi Limit 12 T erminal Cover 1 ...
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A.O. Smith ECT-120 - page 24
24 RESIDENTIAL ELECTRIC W ARRANTY THIS WARRANTY IS APPLICABLE T O THE ORIGINAL OWNER ONL Y . In accordance with the warranty terms and conditions specified 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 wate ...
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A.O. Smith ECT-120 - page 25
25 without invalidating the remainder of the affected provision or the other provisions of this warranty . SERVICE AND LABOR RESPONSIBILITY UNDER THIS LIMITED W ARRANTY , THE W ARRANTOR WILL PROVIDE ONL Y A REPLACEMENT W A TER HEA TER OR P ART THEREOF . THE OWNER IS RESPONSIBLE FOR AL L OTHER COSTS. Such costs may include but are not limited to: a. ...
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A.O. Smith ECT-120 - page 26
26 NOTES: ___________________________________________________ ___________________________________________________ ___________________________________________________ ___________________________________________________ ___________________________________________________ ___________________________________________________ ____________________________ ...
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A.O. Smith ECT-120 - page 27
27 NOTES: ___________________________________________________ ___________________________________________________ ___________________________________________________ ___________________________________________________ ___________________________________________________ ___________________________________________________ ____________________________ ...
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A.O. Smith ECT-120 - page 28
28 w w w .aosmithwaterheaters.com ...
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