FOREWORD

These designs comply with the latest version of the American National Standard for Gas Water Heaters, Volume III, ANSI Z21.10.3 as an automatic circulating tank water heater, and automatic storage water heaters.

Detailed installation diagrams are found in this manual. These diagrams will serve to provide the installer with a reference for the materials and methods of piping necessary. It is highly essential that all water, gas piping and wiring be installed as shown on the diagrams.

Particular attention should be given to the installation of thermometers at the locations indicated on the diagrams as these are necessary for checking the proper functioning of the heater.

In addition to these instructions, the equipment shall be installed in accordance with those installation regulations in force in the local area where the installation is to be made. These shall be carefully followed in all cases. Authorities having jurisdiction should be consulted before installations are made.

In the absence of local codes, the installation must comply with the latest editions of the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and the National Electric Code, NFPA 70. The former is available from the Canadian Standards Association, 8501 East Pleasant Valley Road, Cleveland, OH 44131, and both documents are available from the National Fire Protection Association, 1 Batterymarch Park, Quincy, MA 02269.

TABLE OF CONTENTS

 

PAGE

ROUGH-IN DIMENSIONS

2

FOREWORD

3

FEATURES

4

Water Temperature Control

4

High Limit Switch (E.C.O.)

4

Dishwashing Machine Requirement

5

Circulating Pump

5

INSTALLATION INSTRUCTIONS

5

Required Ability

5

Insulation Blankets

5

Locating The Heater

5

Clearances

6

Hard Water

6

Air Requirements

6

Mechanical Exhausting of Room Air

6

Unconfined Space

6

Confined Space

6

Chemical Vapor Corrosion

6

VENTING

6

Vent Pipe Termination

6

Direct Venting

8

Direct Vent Terminal Installation (Sidewall)

8

Installation Sequence

9

Vertical Vent Terminal Installation

10

Installation Sequence

10

Installation of Vent System

10 -11

Vent Pipe Preparation

11

CONTROLS AND SWITCHES

11-12

Blower Prover Switch

11

Blocked Outlet Prover Switch

12

Blocked Inlet Prover Switch

12

Low Gas Pressure Switch

12

On/Off Switch

12

Hot Surface Igniter

12

GAS PIPING

12

Connection of Gas Pipe

13

Purging

13

Gas Meter Size - City Gases Only

13

Gas Pressure Regulation

13

Gas Valves

13

SYSTEM CONNECTIONS

13

Thermometers

13

Relief Valve

13

 

PAGE

Water Line Connections

14

Heater Wiring

14

OPERATION

15

Sequence of Operation

15

Self Diagnostic Controller

15

Gas Value LEDs Flashing

15

Error Codes

16

Fault Conditions

16

No Incoming Line Voltage

16

No Low Voltage

16

Temperature Probe Fault

16

E.C.O. Switch Open

17

Control Bad

17

Combustion Air Blockage

17

PRIOR TO START-UP

18

Required Ability

18

OPERATIING INSTRUCTIONS

18

Adjustment Procedure (Initial Start-Up)

18

Lighting Instructions

19

Cathodic Protection

20

Precautions

20

GENERAL INFORMATION

20

Power Burner

20

High Limit

20

High Altitude Installations

20

MAINTENANCE

20

General

20

Maintenance Schedule

20

Flushing

21

Draining

21

Sediment Removal

21

Lime Scale Removal

21

Anode Inspection and Replacement

21-22

Drain Valve and Access Panels

22

Relief Valve

22

Circulating Pump

22

Vent System

22

INSTALLATION DIAGRAMS

23 - 27

Manifold Kits

28

CHECKLIST AND SERVICE INFORMATION

29

TROUBLE-SHOOTING

29-30

REPLACEMENT PARTS

30

LIMITED WARRANTY

31

3

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A.O. Smith BTH 120 - 250 warranty Foreword, Table of Contents

BTH 120 - 250 specifications

The A.O. Smith BTH 120 - 250 is a high-efficiency water heater designed for commercial and industrial applications, renowned for its advanced technology and durable construction. This model stands out for its ability to provide reliable hot water while minimizing energy consumption, making it an ideal choice for businesses looking to enhance operational efficiency.

One of the main features of the A.O. Smith BTH series is its innovative design that integrates cutting-edge condensing technology. This system maximizes energy use by capturing and reusing heat that would otherwise be lost in traditional water heating methods. As a result, the BTH 120 - 250 delivers exceptional thermal efficiency ratings, often exceeding 90%, thereby reducing overall operating costs.

The BTH series is available in various capacities, ranging from 120,000 to 250,000 BTU per hour, ensuring that it meets the diverse needs of different businesses. This flexibility allows for installation in a variety of settings, from small restaurants to large manufacturing facilities.

Another significant characteristic of the BTH 120 - 250 is its robust construction. Built with high-quality materials, this unit is designed to withstand the rigors of continuous use. Its stainless steel heat exchanger resists corrosion and scale build-up, providing longevity and reduced maintenance requirements.

Safety features are integrated into the BTH series as well. It includes an electronic ignition system that eliminates the need for a standing pilot light, enhancing operational safety and reducing energy waste. Additionally, the built-in diagnostic system allows for quick identification of issues, streamlining maintenance procedures.

The BTH series also emphasizes user-friendly operation. Equipped with advanced control options, operators can monitor and adjust performance settings effortlessly. The digital display provides real-time operational data, which can assist in optimizing performance and ensuring consistent hot water availability.

In summary, the A.O. Smith BTH 120 - 250 is an exceptional choice for commercial water heating, combining high efficiency, advanced technology, and robust durability. Its innovative design, safety features, and user-friendly controls position it as a trusted solution for businesses seeking reliable hot water systems. By investing in this model, operators can ensure optimal performance while enjoying significant energy savings over time.