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Describes the required skills and qualifications for installation and service.
Warns unqualified individuals not to perform procedures described in this handbook.
Advises checking wiring and connectors for proper contact before component replacement.
Lists essential tools required for proper installation and servicing of the water heater.
Emphasizes referring to the original manual for complete installation and service instructions.
Explains how devices like check valves create closed systems and potential issues.
Details water expansion upon heating and its effects on pressure and components.
Stresses the importance of adequate combustion and ventilation air for proper operation.
Warns about air contaminants damaging components like igniters and burners.
Discusses minimum gas pressure requirements and troubleshooting for low pressure conditions.
Notes certification limits for elevation and provides contact for higher altitude assistance.
Details requirements for low and high-pressure gas supply systems, including regulator needs.
Provides instructions for installing and using positive lock-up gas pressure regulators.
Details the 'Ignition Failure' error, its causes, and troubleshooting steps.
Explains the 'Blocked Air Intake' error and checks for intake pipe blockages.
Explains the 'Blocked Exhaust' error and checks for exhaust pipe blockages.
Describes the 'Flame Sensor Error', causes, and checks for flame detection issues.
Details the 'No Water' error, causes related to powered anodes and water presence.
Explains the 'Anode Shorted' error and checks for shorts to ground or tank.
Describes the 'Temp Probe Short' error and checks for probe resistance.
Details the 'Temp Probe Open' error and checks for probe resistance.
Covers errors related to flue gas probe resistance being too low or too high.
Explains the 'High Limit' error for flue gas temperature and troubleshooting.
Details the 'Flow Not Detected' error and checks for water flow confirmation.
Describes the 'Flow Switch Stuck Closed' error and troubleshooting steps.
Discusses stable power requirements and potential issues from voltage fluctuations or noise.
Recommends dedicated wiring and breakers for electrical stability and noise reduction.
Outlines adherence to National and local electrical codes for proper wiring.
Details the step-by-step procedure for connecting the 120 VAC power supply to the unit.
Explains the function of the Enable/Disable switch and its limitations in power control.
Guides on verifying proper grounding and polarity using a volt meter at the junction box.
Explains the basic operational principles of the water heater, including heat exchanger and burner.
Describes the assembly, control, and operation of the combustion blower.
Explains how the water heater modulates its firing rate based on temperature and demand.
Details how the CCB controls blower speed based on sensor feedback for optimal input.
Describes the radial design burner and its key components.
Provides step-by-step instructions for safely removing the combustion blower and burner assembly.
Provides step-by-step instructions for reinstalling the combustion blower and burner assembly.
Instructions for safely removing and replacing the CCB enclosure cover.
Provides a diagram showing the layout of the Central Control Board (CCB) and its connectors.
Details the pinouts and functions for various CCB connection sockets.
Explains the User Interface Module (UIM) display, status icons, and operational buttons.
Describes the iCOMM connectivity hardware and the A. O. Smith app for remote management.
Provides QR codes for downloading the mobile app to access remote monitoring features.
General| Category | Water Heater |
|---|---|
| Brand | A.O. Smith |
| Capacity | 100 gallons |
| Energy Factor | 0.67 |
| Height | 72 inches |
| Input | 199, 000 BTU/hr |
| Thermal Efficiency | 80% |
| Fuel Type | Natural Gas |
| Venting | Power Vent |
| Series | Cyclone XL 100 Series |
| Type | Gas |
