A.O. Smith BTH 199 Series User Manual

MODELS COVERED: BTH 120 THRU 500
SERIES 100, 101 AND
BTH 400/500 SERIES 104
500 Tennessee Waltz Parkway
Ashland City, TN 37015
PRINTED IN THE U.S.A. 1012 316586-002
SERVICING SHOULD ONLY BE PERFORMED BY A QUALIFIED SERVICE TECHNICIAN
Service Handbook
COMMERCIAL GAS HIGH EFFICIENCY WATER HEATERS
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html

A.O. Smith BTH 199 Series Specifications

General

Brand	A.O. Smith
Model	BTH 199 Series
Fuel Type	Natural Gas
Input BTU/hr	199, 000
Voltage	120V
Thermostat	Electronic
Type	Tankless
Flow Rate	9.8 GPM
Energy Source	Gas
Safety Features	Flame Failure Protection, Overheat Protection
Warranty	5 years

Summary

Control System Operation and Settings

Control Overview and Interface

Adjusting Tank Temperature Settings

Procedures for modifying the operating set point and differential.

Faults, Warnings, and Diagnostics

Fault and Warning Condition Explanations

Defines fault/warning types and how diagnostic information is presented.

Accessing Fault History and Information

Comprehensive Fault Code Reference

A detailed list of fault codes and their associated error descriptions.

Component Identification and Troubleshooting

Central Control Board (CCB) Details

Information on the CCB, its location, and connections.

Gas Control Valves by Model

Pressure Switch Specifications

Details on the function and operating pressures of all pressure switches.

Key Components: Igniter, Sensor, Anodes

Blower and Variable Frequency Drive (VFD)

Blower Speed Control (BTH 199/250)

How blower speed is controlled and measured for specific models.

Variable Frequency Drive (VFD) Setup

Instructions for configuring the VFD for proper blower operation.

VFD Speed and Pressure Readings

Table of VFD operating parameters and required pressure readings.

Wiring Diagrams

Wiring Diagram – BTH 120-300

Wiring Diagram – BTH 400, 500