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A.O. Smith 110 Indoor User Manual

A.O. Smith 110 Indoor
65 pages
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110 Indoor / 110 Outdoor Service Manual
Ver. 1.01
1
CONFIDENTIA
L
110 Direct Vent Indoor
and Outdoor Models
On-Demand Water Heater
Service Manual
110 Indoor
A.O. Smith Water Products Company
500 Tennessee Waltz Parkway
Ashland City, TN 37015
Toll Free: 1
-
877
-
73
7
2840
110 Outdoor
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A.O. Smith 110 Indoor Specifications

General IconGeneral
BrandA.O. Smith
Model110 Indoor
Capacity10 Gallons
Installation TypeIndoor
Energy SourceElectric
Voltage120V
Wattage/Power1500W
ThermostatAdjustable

Summary

1. Specifications

2. Exterior View

110 Indoor Exterior View

Detailed diagrams and dimensions of the 110 Indoor model's exterior.

110 Outdoor Exterior View

Detailed diagrams and dimensions of the 110 Outdoor model's exterior.

3. Interior View

110 Indoor Interior View

Exploded view diagram identifying internal components of the 110 Indoor model.

110 Outdoor Interior View

Exploded view diagram identifying internal components of the 110 Outdoor model.

4. List of Main Components

5. Schematic Diagram

6. Wiring Diagram

7. Wiring Diagram Check Points

8. Thermistor Resistance Values

9. Operational Flow Chart

10. Component Specifications

10-1. Burners

Details on burner function, failure events, error codes, and diagnostics.

10-2. Gas Manifold

Information on gas manifold function, failure events, error codes, and diagnostics.

10-3. Fan Motor

Details on fan motor function, failure events, error codes, and diagnostics.

10-4. Gas Valve Assembly

Information on gas valve assembly function, failure events, error codes, and diagnostics.

10-5. Flame Rod

Details on flame rod function, failure events, error codes, and diagnostics.

10-6. AFR Rod

Information on AFR rod function, failure events, error codes, and diagnostics.

10-7. Heat Exchanger

Details on heat exchanger function, failure events, error codes, and diagnostics.

10-8. Flow Adjustment Valve

Information on flow adjustment valve function, failure events, error codes, and diagnostics.

10-9. Flow Sensor

Details on flow sensor function, failure events, error codes, and diagnostics.

10-10. Thermistors

Information on thermistor function, failure events, error codes, and diagnostics.

10-11. Hi-Limit Switch

Details on hi-limit switch function, failure events, error codes, and diagnostics.

10-12. Overheat Cutoff Fuse

Information on overheat cutoff fuse function, failure events, error codes, and diagnostics.

10-13. Freeze Protection Heaters

Details on freeze protection heaters function, failure events, error codes, and diagnostics.

10-14. Computer Board

Information on computer board function, failure events, error codes, and diagnostics.

10-15. Transformer

Details on transformer function, failure events, error codes, and diagnostics.

10-16. Igniter

Information on igniter function, failure events, error codes, and diagnostics.

10-17. Freeze Protection Thermostat

Details on freeze protection thermostat function, failure events, error codes, and diagnostics.

10-18. Surge Box

Information on surge box function, failure events, error codes, and diagnostics.

11. Fault Analysis and Specifications

No Display on Remote Controller

Analyzes issues when the remote controller shows no display, even when powered on.

Slow Hot Water Delivery

Analyzes why it takes a long time for hot water to reach fixtures.

Insufficient Hot Water Temperature

Analyzes causes for insufficient hot water temperature.

Excessively Hot Water Temperature

Analyzes causes for excessively hot water temperature.

No Hot Water Availability

Analyzes why hot water is unavailable when a fixture is opened.

Hot Water Turns Cold

Analyzes why hot water turns cold and remains so.

Fan Motor Spinning After Shutdown

Explains why the fan motor continues to spin after operation stops.

Abnormal Water Heater Sounds

Analyzes the causes of abnormal sounds emanating from the water heater.

Hot Water Temperature Fluctuations

Discusses faults causing fluctuations in hot water temperature.

Error Code 11: Ignition Failure

Details on ignition failure, including diagnosis and cancellation methods.

Error Code 12: Loss of Flame

Details on loss of flame, including diagnosis and cancellation methods.

Error Code 31: Outlet Thermistor Fault

Details on disconnected/short-circuited outlet thermistor issues.

Error Code 32: Inlet Thermistor Fault

Details on disconnected/short-circuited inlet thermistor issues.

Error Code 39: AFR Rod Fault

Details on disconnected AFR rod issues.

Error Code 51: Main Gas Solenoid Valve Fault

Details on fault of driving circuit for the main gas solenoid valve.

Error Code 55: Gas Solenoid Valve Circuit Fault

Details on fault of driving circuit for gas solenoid valves.

Error Code 61: Fan Motor Fault

Details on fan motor fault issues.

Error Code 70: PCB or Gas Proportional Valve Fault

Details on PCB fault or gas proportional valve fault.

Error Code 72: False Flame Detection

Details on false flame detection.

Error Code 74: Remote Controller Communication Fault

Details on miscommunication between water heater and remote controller.

Error Code 99: Imperfect Combustion

Details on imperfect combustion issues.

12. Controls and Settings

12-1. Diagnostics using the 9007666005

How to use the 9007666005 remote controller for diagnostics.

12-2. Verifying Computer Board Functionality

Procedure to verify the proper functioning of the computer board.

12-3. Error Code Display Patterns

Explains the LED display patterns corresponding to different error codes.

12-4. Clearing Error Codes 10 and 99

Procedure for clearing specific error codes after resolving issues.

12-5. AFR Rod Function

Explains the function of the AFR rod and its role in combustion.

12-6. Dipswitch Settings

Details on the dipswitch functions and their settings.

12-7. ON/OFF Conditions Overview

Overview of the ON/OFF conditions for the water heater.

12-7. BTU Requirements for ON/OFF

Explains BTU requirements for ON/OFF conditions and provides a table.

12-8. High-Altitude Support Functions

Details on high-altitude support functions and their settings.

12-9. Adjusting Manifold Gas Pressure

Procedures for adjusting maximum and minimum manifold gas pressure.

12-10. Freeze Protection System

Explains the operation of the freeze protection system.

12-11. Draining Unit and Cleaning Inlet Filter

Step-by-step guide for draining the unit and cleaning the filter.

13. Component Diagrams

Case Assembly Diagrams

Exploded view diagrams for the case assembly of both models.

Burner Assembly Diagram

Exploded view diagram for the burner assembly.

Computer Board and Water Way Diagrams

Exploded view diagrams for computer board and water way assemblies.

14. Parts List

15. Revisions

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