A.O. Smith BTX-80 SERIES 100 User Manual

A.O. Smith BTX-80 SERIES 100

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Instruction Manual

PRINTED 0810 197086-004

KEEP THIS MANUAL IN THE POCKET ON HEATER FOR FUTURE REFERENCE

WHENEVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED.

POWER VENTED GAS MODELS W/HOT SURFACE IGNITION

MODEL BTX-80 SERIES 100

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.

COMMERCIAL GAS WATER HEATERS

• For Your Safety •

AN ODORANT IS ADDED TO THE GAS USED

BY THIS WATER HEATER.

500 Tennessee Waltz Parkway

Ashland City, TN 37015

Low Lead Content

Table of Contents

Questions and Answers:

B
Benjamin MorganAug 7, 2025
How to fix an open ignitor circuit on A.O. Smith Water Heater?
- J
  julie77Aug 7, 2025
  If the Intelli-Vent™ control detects an open ignitor circuit in your A.O. Smith Water Heater, try these steps: 1. Inspect the wiring to the hot surface ignitor, and replace the ignitor assembly if any damage or wear is found. 2. Check the ignitor assembly plug and the socket on the Intelli-Vent™ body to ensure a good connection. Replace the ignitor assembly and/or control if necessary. 3. Measure the resistance of the ignitor at room temperature (77ºF or 25°C) at the plug end. Replace the ignitor if the resistance is not between 11.5 and 18.8 ohms. 4. If all the above tests pass and the error persists, replace the Intelli-Vent™ control.
J
Joanna BarrettAug 15, 2025
What to do if pressure switch circuit remains closed on A.O. Smith BTX-80 100?
- M
  Mrs. Hannah Choi MDAug 15, 2025
  If the pressure switch circuit remains closed for more than 5 seconds after the heating cycle begins and the blower doesn't start on your A.O. Smith Water Heater, take these steps: * Ensure the air pressure switch circuit wiring is correct and the air pressure switch is not jumpered. * Cut power to the water heater, then check the continuity of the air pressure switch contacts with the wires disconnected. * If the pressure switch contacts show continuity (closed circuit), replace the pressure switch. * If the pressure switch contacts are open and all wiring is correct, turn the power off for 10-20 seconds then on again to clear the error code. If the error code persists, replace the Intelli-Vent™ control.
C
craigericAug 22, 2025
How to fix no earth ground sensed by A.O. Smith Water Heater?
- J
  jeremydavisAug 22, 2025
  To address inadequate or no earth ground sensed by the Intelli-Vent™ control on your A.O. Smith Water Heater: * Ensure the wall outlet is properly grounded. * Ensure all ground connections/wires on the water heater are secure.

A.O. Smith BTX-80 SERIES 100 Specifications

General

Brand	A.O. Smith
Model	BTX-80 SERIES 100
Category	Water Heater
Language	English

Summary

General Safety Warnings

Fire and Explosion Risk from Gas

If instructions are not followed, fire or explosion may result, causing severe damage or injury.

Actions When Smelling Gas

Immediate steps if gas odor detected: do not light, avoid sparks, call gas supplier.

Important Safety Precautions

Fire Hazard Warnings

Do not install on carpeted floors; do not operate if flood damaged.

Scald Hazard Prevention

Water over 125°F can cause severe burns; feel water before use.

Explosion Hazard Warnings

Overheated water can cause tank explosion; ensure T&P valve is installed.

Installation and Hazard Warnings

Carbon Monoxide Gas Hazard

Ensuring proper ventilation is critical to prevent CO poisoning.

Flammable Vapor Precautions

Keep flammable liquids away from the water heater to prevent fire or explosion.

Piping Configurations and Temperature Control

Mixing Valve and Expansion Tank Usage

Scald Hazard from Hot Water

Table showing burn times at different water temperatures.

Water Heater Location Considerations

Choosing an Indoor Location

Factors for selecting a safe and accessible location for the water heater.

Flammable Vapors and Fire Risk

Warnings about storing flammable liquids near the appliance.

Installation Clearances and Air Supply

Required Installation Clearances

Combustion Air Requirements

Importance of adequate air supply for safe combustion and ventilation.

Confined Space Ventilation

Air Requirements for Confined Spaces

Methods for providing fresh air in enclosed installation areas.

Outdoor Air Intake Methods

Ducting Air for Confined Spaces

Thermal Expansion and Relief Valve Installation

Thermal Expansion Control

Temperature-Pressure Relief Valve Function

Details on the T&P valve, its compliance, and installation.

Installation Details and Gas Supply

Gas Piping Safety and Requirements

Ensuring safe gas supply connection and compliance with codes.

Gas Piping and Sediment Traps

Sediment Trap Installation

Filling the Water Heater Tank

Vent Pipe Assembly and Venting Safety

Vent Pipe Assembly Instructions

Venting Safety and Carbon Monoxide

Critical warnings about proper venting and CO risks.

Operating Instructions and Safety Checks

Pre-Operation Safety Checklist

Essential steps before starting the water heater, including gas smell check.

Standard Operating Procedure

Water Temperature Regulation

Recommended Temperature Settings

Guidance on setting temperatures to prevent scalding and save energy.

Adjusting the Temperature Control

Periodic Maintenance Schedule

Venting System Inspection Guidelines

Burner and Housekeeping Checks

Maintenance and Flushing Procedures

Temperature-Pressure Relief Valve Test

Procedure for testing the T&P valve for proper operation.

Draining and Flushing the Tank

Leakage Checkpoints and Troubleshooting

Identifying Water Leak Sources

Intelli-Vent Troubleshooting Guide

Troubleshooting: Grounding and Power Issues

Resolving issues related to grounding, polarity, and power supply.

Troubleshooting: Pressure Switch and Blower

Diagnosing problems with the pressure switch and blower operation.

Intelli-Vent Troubleshooting: Control Errors

Troubleshooting: Ignition and Flame Failure

Addressing ignition problems and lockout conditions.

Troubleshooting: Temperature Sensor and Buttons

Intelli-Vent Troubleshooting: Ignitor and Air Switches

Troubleshooting: Ignitor Wire Resistance

Checking ignitor wire resistance and potential component failures.

Troubleshooting: Air Pressure and Limit Switches

Diagnosing repeated air pressure switch cycling and vent temperature limit issues.

General Troubleshooting Scenarios

Resolving 'Not Enough Hot Water' Issues

Addressing Vent Pipe and Flame Issues

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