The pilot light may not stay lit on the A.O. Smith 100 Series due to issues with the pilot valve or ignition system. To troubleshoot:

1. Pilot Valve Issues:
- Check the pilot valve terminal wiring for errors and correct any issues.
- Reset and sequence the module. If the problem persists, the module may need to be replaced.

2. Ignition Issues:
- Check the ignition terminal wiring for errors and correct any issues.
- Reset and sequence the module. If the fault continues, the module may need to be replaced.

Ensure all wiring is secure and free from faults before replacing components.

This answer is automatically generated

Summary of Contents for A.O. Smith 100 Series

Page 1 Instruction Manual INDUSTRIAL ELECTRIC WATER HEATERS INDUSTRIAL ELECTRIC WATER HEATERS MODELS 52/80/120 (SERIES 100) Saudi Arabia and Kuwait Manual Installation - Service - Maintenance - Operation Thank you for buying this energy efficient water heater. We appreciate your confidence in our products. Read and understand this instruction manual and the safety messages Electrical Shock Hazard...
Page 2: Table Of Contents
CONTENTS CONTENTS SAFE INSTALLATION, USE, AND SERVICE ........3 Draining the Water Heater ........... 17 Important Definitions ............. 3 TEMPERATURE REGULATION ............18 GENERAL SAFETY INFORMATION ..........4 Limiting the Risk of Scalding ..........18 High Temperature Limit Controls (ECO) ......18 Limiting the Risk of Scalding ..........
Page 3: Safe Installation, Use, And Service
SAFE INSTALLATION, USE, AND SERVICE SAFE INSTALLATION, USE, AND SERVICE The proper installation, use and servicing of this water heater is extremely important to your safety and the safety of others. 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.
Page 4: General Safety Information
GENERAL SAFETY INFORMATION GENERAL SAFETY INFORMATION LIMITING THE RISK OF SCALDING Children should be supervised to insure they do not play with the appliance. For a variety of reasons, water heaters can produce water that is GROUNDING INSTRUCTIONS much hotter than its temperature setting. Take precautions to prevent this higher temperature water from reaching the water fixtures.
Page 5 Burn Hazard Explosion Hazard To reduce the risk of unusually hot Temperature-Pressure Relief Valve water reaching the fixtures in the must comply with ANSI Z21.22- house, install thermostatic mixing CSA 4.4 and ASME code. valves at each point of use. Properly sized temperature- pressure relief valve must be installed in opening provided.
Page 6 Burn hazard. Hot water discharge. Keep clear of Temperature- Pressure Relief Valve discharge outlet. Property Damage Hazard Avoid damage. Inspection and replacement of anode rod required. CAUTION Property Damage Hazard To avoid water heater damage, fill tank with water before operating.
Page 7: Introduction
INTRODUCTION INTRODUCTION method of piping suggested. IT IS NECESSARY THAT Thank You for purchasing this water heater. Properly installed ALL WATER PIPING AND THE ELECTRICAL WIRING and maintained, it should give you years of trouble free service. BE INSTALLED AND CONNECTED AS SHOWN IN THE Installation and service of this water heater requires ability equivalent DIAGRAMS.
Page 8: Features And Components
FEATURES AND COMPONENTS FEATURES AND COMPONENTS This Instruction Manual covers two models of commercial electric In this Instruction Manual ,the other model is equipped with an water heaters. These two models are equipped from the factory with electronic control system and is referred to as: “Electronic Control” different controls.
Page 9 Figure 2. Surface Mount Control Models...
Page 10: Model And Rating
Table 1. Recovery Rate in Gallons per Hour* Temperature Rise °F DegF 30° 40° 50° 60° 70° 80° 90° 100° 110° 120° 130° 140° Standard Input kW Input BTUH DegC 17° 22° 28° 33° 39° 44° 50° 56° 61° 67° 72°...
Page 11: Installation Considerations
INSTALLATION CONSIDERATIONS INSTALLATION CONSIDERATIONS ROUGH-IN DIMENSIONS Figure 4. Dimensions and Components Table 2. Tank Capacities and Dimensions Model Number Tank Capacity in Gallons (Liters) A - Inches (mm) B - Inches (mm) C - Inches (mm) Inlet/Outlet 50 (189.3) 55 3/4 (1416) 21 3/4 (552) 27 (685) 1 1/4...
Page 12: Installing The Water Heater
INSTALLING THE WATER HEATER INSTALLING THE WATER HEATER REQUIRED ABILITY Table 3. Burn Time at Various Temperatures Time for Installation and service of this water heater requires ability equivalent Water Time for Permanent Burns to that of a qualified agency (page 2) in the field involved. Plumbing Temperature 1st Degree Burn 2nd &...
Page 13: Temperature-Pressure Relief Valve
TEMPERATURE-PRESSURE RELIEF VALVE Property Damage Hazard Explosion Hazard ● The temperature-pressure relief-valve discharge pipe must terminate at an adequate drain. Temperature-Pressure Relief Valve must comply with ANSI Z21.22- The Discharge Pipe: CSA 4.4 and ASME code. • Shall not be smaller in size than the outlet pipe size of the valve or have any reducing couplings or other restrictions.
Page 14: Thermal Expansion
THERMAL EXPANSION As water is heated, it expands (thermal expansion). In a closed Electrical Shock Hazard system the volume of water will grow when it is heated. As the volume of water grows there will be a corresponding increase in ●...
Page 15: Amperage Table/Over-Current Protection
Table 4. Allowable Ampacities of Insulated Conductors Temperature Rating of Conductor 140 °F 167 °F 185 °F (194 °F) 140 °F 167 °F 185 °F 194 °F Size (60 °C) ( 75 °C) (85 °C) (90 °C) (60 °C) ( 75 °C) (85 °C) (90 °C) Size...
Page 16: Sequence Of Operation
SEQUENCE OF OPERATION When the control is powered, the UIM should display model information, water temperature, Operating Set Point, heating status and operating mode. If the control determines that the actual water temperature inside the tank is below the programmed Operating Setpoint minus the (1st) differential, a call for heat is activated.
Page 17: Start Up
START UP START UP Refer to the Features And Components (page 8) for the location of INITIAL START UP components mentioned in the instructions that follow. The following checks should be made by the installer when the heater NEVER turn on power to the water heater without being certain the is placed into operation for the first time.
Page 18: Temperature Regulation
TEMPERATURE REGULATION TEMPERATURE REGULATION LIMITING THE RISK OF SCALDING SURFACE MOUNT CONTROL MODELS Surface Mount Control models have multiple surface mounted For a variety of reasons, water heaters can produce water that is Thermostat/ECO combination controls. One for each installed much hotter than its temperature setting.
Page 19 THERMOSTAT SETTINGS - SURFACE MOUNT CONTROL THERMOSTAT SETTINGS - ELECTRONIC CONTROLS Adjustment of temperature controls on surface mounted controls is Water temperature over 125°F (52°C) to be performed by a qualified service agent at initial start-up. can cause severe burns instantly resulting in severe injury or death.
Page 20: Control System Operation
CONTROL SYSTEM OPERATION CONTROL SYSTEM OPERATION CONTROL SYSTEM FEATURES HOME SCREEN Advanced Diagnostics: Plain English text and animated icons Figure 5 below shows the control system “Home Screen.” This is display detailed operational and diagnostic information. LCD screen the default screen. If there are no active Fault or Alert conditions on the front of the water heater displays the Sequence of Operation and no user input for approximately 10 minutes the control system in real time.
Page 21 STATUS ICONS The Status Icons are displayed on the Home screen and convey operational and diagnostic information. The icons are described in the table below. Table 6. Status Icons ICON DESCRIPTION Water temperature in the tank has fallen. Shaded area of the animated thermometer icon will rise and fall in response to water temperature in the storage tank as sensed from the immersion Temperature Probe.
Page 22 OPERATING STATES The current operational state of the water heater is displayed on the Home screen as the “Status.” The common operational states are described in the table below. Table 7. Operating States STATE DESCRIPTION The water heater is not in an active heating cycle. This usually indicates the temperature in the tank has reached the Standby Operating Set Point and the control system has terminated the heating cycle.
Page 23: Temperatures Menus
TEMPERATURES MENUS OPERATING SETPOINT OPERATING SEQUENCE User adjustable setting 90°F (32.2°C) to 190°F (87.8°C) range; With an Operating Set Point of 120°F (48.9°C) and all Differential factory default is 120°F (48.9°C). (The factory setting for SASO settings at 2°F (1.1°C) the On/Off sequencing of heating element compliant units is 140°F/60°C).
Page 24 TEMPERATURE SETTINGS The Operating Set Point and the Differential Settings are adjusted in the Temperatures Menu. The following instructions explain how to adjust these user settings and navigate the control system menus. ACTION DISPLAY From the Home Screen, press the Operational Button underneath “MENU”...
Page 25 HEATER STATUS MENU This menu displays non adjustable operational information. This menu contains more information that can be displayed on one screen of the LCD display. Use the Up & Down Buttons to navigate to the bottom of this menu. Table 10.
Page 26: Economy Mode Setup Menu
ECONOMY MODE SETUP MENU This menu contains settings used to establish an “Economy Set Point” and “Economy Mode” operating periods. This control system feature can help reduce operating costs during unoccupied, low load, or peak demand periods. Table 11. Economy Mode Home Screen and Setup Menu ACTION DISPLAY Home Screen During Economy Mode...
Page 27: Economy Mode Settings
ECONOMY MODE SETTINGS Table 12. Economy Mode Settings: Setpoint Adjustment Value ACTION DISPLAY From the Home Screen, press the Operational Button underneath “MENU” to enter the Main Menu. Notice how the text above the Operational Buttons on the display changes as you navigate through the various menus and screens.
Page 28 Table 13. Economy Mode Settings: Time Clock Settings ACTION DISPLAY From the Home Screen navigate to the Economy Mode Setup menu. Use the Up/Down buttons to select (highlight in black) Current Time sub menu. Press the Operational Button underneath “CHANGE” to enter the Current Time sub menu.
Page 29 Table 14. Economy Mode Settings: Daily Operating Mode Settings ACTION DISPLAY Economy Mode All Day: From the Economy Mode Setup menu use the Up/Down buttons to select (highlight in black) the Daily sub menu for “Sun.” Press the Operational Button underneath “CHANGE” to enter this menu. Use the Up/Down buttons to select (highlight in black) the “Economy Mode All Day”...
Page 30: Alarm Output Setup Menu
ALARM OUTPUT SETUP MENU Permits user to set the condition (from a list of options) for when The alarm relay operates in the background according to the settings the CCB’s integral alarm output relay will be energized. Alarm relay in this menu and is not capable of disabling water heater operation. connections (common, normally open, normally closed) are located The alarm relay is used for external notification/verification of on the J3 terminal strip on the CCB.
Page 31: Display Settings Menu
DISPLAY SETTINGS MENU Display Settings Menu ACTION DISPLAY Permits user to set display options for viewing information on the UIM’s LCD screen. Temperature Units: Adjustable user setting that changes temperature units display to Celsius °C or Fahrenheit °F. Backlight Delay: Adjustable user setting that determines how long the UIM’s LCD backlight remains illuminated after a key has been pressed.
Page 32: Current Fault / Alert Menu
CURRENT FAULT / ALERT MENU Current Fault / Alert Menu ACTION DISPLAY This menu displays non adjustable operational information. With the Fault History sub menu selected in Main Menu; press the Operational Button underneath “SELECT” to display the current Fault or Alert message. If there is not a Fault or Alert condition currently active “(none)”...
Page 33: Fault Occurrence Menu
FAULT OCCURRENCE MENU Fault Occurrence Menu ACTION DISPLAY Total accumulated number each individual Fault condition has occurred is displayed in this menu. This running total of Fault Occurrences can be useful in determining which (if any) operational problems have been persistent.
Page 34: Maintenance
MAINTENANCE MAINTENANCE Connect a hose to the water heater drain valve and terminate it Table 17. Maintenance Schedule to an adequate drain. Component Operation Interval Reference Every 6 Open the water heater drain valve and allow all the water to drain Tank Drain and Flush See Draining and Flushing.
Page 35: Sediment Removal
The use of a water softener may decrease the life of the water SEDIMENT REMOVAL heater tank. Water borne impurities consist of fine particles of soil and sand which The anode rod should be inspected annually. 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 The following are typical (but not all) signs of a depleted anode rod: elements and cause their failure.
Page 36: Temperature-Pressure Relief Valve Test
Attach element wires to connection points from which they were removed. Follow FILLING instructions to restore hot water service. • Check for water leaks around elements and proper op- eration when heater is filled. • Close the front panel. TEMPERATURE-PRESSURE RELIEF VALVE TEST Figure 14.
Page 37: Troubleshooting
TROUBLESHOOTING TROUBLESHOOTING CHECKLIST • The sounds are normal, however, tank bottom and ele- ments should be cleaned. See Maintenance (page 34). 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.
Page 38: Checking For Leaks
CHECKING FOR LEAKS 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. Water leaks which appear at the water heater bottom or on the surrounding floor may be caused by condensation, loose connections or relief valve operation and leakage.
Page 39: Diagrams
DIAGRAMS DIAGRAMS WIRING DIAGRAMS The water heater’s electrical components are pictured and identified on page 7. The following describes the heater circuits and includes wiring diagrams. All heater circuits are designed for 60/50 hertz alternating current. The water heater circuit wiring is 12 AWG, AWM, or TEW type, rated 600 volts, 105°C.
Page 40 Figure 17. Electronic Control Models Single / Three Phase Delta...
Page 41 Figure 18. Nine Element - Single and Three Phase. CONVERSION TO SINGLE PHASE CONVERSION TO THREE PHASE When the heater is shipped for connection to a three-phase electrical When heater is shipped for connection to a single-phase electrical service, it may be connected to a single-phase electrical service of service, it may be connected to a three-phase electrical service of the same voltage by: the same voltage by:...
Page 42 Figure 19. Surface-Mount Controls Three- and Six-Element, Three-Phase Circuits...
Page 43 Figure 20. 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 electrical When heater is shipped for connection to a single-phase electrical service, it may be connected to a single-phase electrical service of service, it may be connected to a three-phase electrical service of the same voltage by: the same voltage by:...
Page 44 Figure 21. Transformer Connections For “Y” Connections Table 18. Universal Transformer Configuration Input Voltage Input Connection Output Connection 220 VOLT H1-H2 X1-X4 380 VOLT H1-H3 X1-X4 400/415 VOLT H1-H3 X1-X3 575/600 VOLT H1-H5 X1-X3...
Page 45 Figure 22. Control Circuit Diagram “Y” Connections - Electronic Control Models...
Page 46 Fuses Optional for Canadian Models Figure 23. “Y” Connection Power Circuit Diagram for Units with “Immersion” Type Temperature Probe...
Page 47 Figure 24. “Y” Connections Power Circuit Diagram for Units with Surface - Mounted Thermostat...
Page 48: Piping Diagrams
PIPING DIAGRAMS...
Page 56: Manifold Kits
MANIFOLD KITS MANIFOLD KITS Table 19. Manifold Kits with Two Heaters Tank Capacity Part (Gallons) Number 52 (189.3) 100109231 66 1/4 56 3/4 27 1/4 13 1/4 80 (302.8) 100109231 70 1/2 60 1/4 31 1/4 9 3/4 120 (450.5) 100109231 73 1/4 64 1/2...
Page 57 NOTES NOTES...
Page 58 NOTES NOTES...
Page 59 NOTES NOTES...
Page 67 ‫خزان‬...
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A.O. Smith 100 Series Instruction Manual

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