To Next PageTo Next Page
Need help?Do you have a question about the A.O. Smith BTH-120 and is the answer not in the manual?
General| Model | BTH-120 |
|---|---|
| Category | Water Heater |
| Type | Tank |
| Fuel Type | Natural Gas |
| Capacity | 120 gallons |
| Energy Factor | 0.62 |
| Pressure Rating | 150 PSI |
| Insulation | Foam |
| Warranty - Tank | 6 years |
| Warranty - Parts | 1 year |
| Power Source | Gas |
| Heating Element | Gas Burner |
| Temperature Range | 120°F to 180°F |
Lists certifications and standards the product meets.
Lists immediate actions and warnings for unsafe conditions.
Details the requirements for electrical grounding of the unit.
Critical warnings about fire, CO, and electrical shock risks.
Defines requirements for qualified personnel performing installation and service.
Describes compatibility with remote monitoring systems.
Describes the primary function of the heat exchanger and burner.
Illustrates and describes the blower/burner assembly.
Diagram showing top view components for specific models.
Lists and describes the numbered components for BTH 120 & 150 models.
Diagram showing top view components for specific models.
Lists and describes the numbered components for BTH 199 & 250 models.
Diagram showing side views for specific models.
Diagram showing side views for specific models.
Provides critical dimensions for planning installation locations.
Diagrams illustrating top views for different models.
Warns about potential water damage and the need for drainage.
Safety warnings regarding flammable vapors and ignition sources.
Details the necessary space for servicing various components.
Specifies clearances for vent and intake air piping.
Details requirements for natural gas and propane supply lines.
Specifies electrical requirements, grounding, and polarity.
Discusses potential issues with power supply quality and solutions.
Information on using mixing valves to control water temperature.
Discusses implications of closed water systems and thermal expansion.
Explains thermal expansion and the need for expansion tanks.
Lists specific requirements for the discharge pipe of the T&P valve.
Importance and function of the condensate drain water trap.
Warnings about storing flammable materials near the appliance.
Risks associated with contaminated combustion air and CO.
Warnings about CO risks and the need for proper air supply.
Defines requirements for adequate air in unconfined spaces.
Defines confined spaces and air supply requirements.
Requirements for installing CO detectors in Massachusetts.
Specifies required signage for gas vent terminals.
Warnings about CO risks and the need for proper air supply.
Overview of Power Vent and Direct Vent configurations.
Steps to inspect and adjust the intake air tee fitting.
Lists approved materials for vent and intake air piping.
Specifies requirements for vent and intake air pipe sizes.
Details maximum allowable equivalent lengths for pipe runs.
Step-by-step instructions for installing power vent configurations.
Step-by-step instructions for installing direct vent configurations.
Illustrates standard factory supplied vent and intake air terminations.
Illustrates direct vent sidewall termination with standard components.
Illustrates clearance requirements for flat roof concentric terminations.
Illustrates vertical installation of 4-inch concentric terminations.
Illustrates sidewall installation of 4-inch concentric terminations.
Details clearances for concentric terminations in close proximity or standard.
Illustrates arrangements for two concentric terminations.
Illustrates arrangements for three concentric terminations.
Shows sidewall and roof arrangements for two terminations.
Shows sidewall and roof arrangements for four terminations.
Shows sidewall and roof arrangements for eight terminations.
Diagrams of vertical and horizontal power vent configurations.
Diagrams of vertical and horizontal direct vent configurations.
Diagram of a direct vent with horizontal intake configuration.
Diagram of a direct vent with vertical intake configuration.
Diagram of a direct vent with vertical concentric termination.
Diagram of a direct vent with horizontal concentric termination.
Details exterior clearances for sidewall vent terminations.
Details exterior clearances for sidewall vent terminations.
Instructions for installing the condensate drain line.
Diagram showing details of the condensate trap assembly.
Guidelines for sizing the supply gas line based on length and input.
Table providing gas line sizing data in US units.
Procedures for testing gas lines for leaks.
Instructions for connecting the 120 VAC power supply.
Explains the importance of correct power supply polarity.
Describes the circuit for disabling heating operation via external controls.
Provides diagrams for typical water piping applications.
Details requirements for the Temperature-Pressure Relief Valve discharge pipe.
Explains the function and reset of the ECO limit switch.
Information on setting the thermostat and scald prevention.
Overview of the electronic control system components and function.
How to navigate menus and use user input buttons.
Description and illustration of the user interface module.
Descriptions of various status icons indicating operational states and faults.
State where the water heater is not actively heating.
State indicating the water is actively being heated.
Describes key process steps like input verification and cycle delays.
Access to adjust operating set point and differential settings.
Details on temperature probes and offset adjustments.
Displays operational status of switches and components.
User adjustable settings for screen display, units, and backlight.
Displays accumulated operational time, cycle counts, and software versions.
Displays the active fault message and its cause.
Lists recent fault and alert messages with timestamps.
Shows the total count of each fault condition encountered.
Option to enable display of personalized contact information.
Allows entry or modification of the service contact name.
Allows entry or modification of the service contact phone number.
Lists prerequisites and skills required before starting the unit.
Instructions for filling the tank and purging the gas line.
Detailed procedure for the initial startup of the water heater.
Diagram showing the top view of the gas valve for specific models.
Diagram showing the top view of the gas valve/venturi assembly.
Instructions for adjusting manifold gas pressure.
Guidance for installing the water heater at high altitudes.
Safety and operating instructions specific to BTH 120/150 models.
Step-by-step guide for operating the water heater.
Checklist to verify installation requirements before troubleshooting.
Explanation of the normal sequence of operation for the unit.
Lists common installation oversights causing operational issues.
Addresses issues related to rough ignition or operation.
Discusses causes and solutions for excessively hot water.
Explains causes of rumbling or pounding noises during heating.
Lists potential causes for water leakage from the unit.
Explains fault and alert messages displayed by the control system.
Lists potential causes and checks for specific fault messages.
Lists potential causes and checks for specific fault messages.
Table outlining periodic maintenance operations and intervals.
Procedures for draining and flushing the water heater tank.
Diagram illustrating the layout of the central control board.
Details the function and operation of the S1 dipswitches.
Wiring diagram for pumps used in storage tank or building recirculation.
Wiring diagram for pumps used in dishwasher loops with toggle switches.
Diagram for a single water heater with building recirculation.
Warranty coverage details for the water heater tank.
Warranty coverage details for all other parts.
Lists conditions and exceptions that apply to the warranty.
