TABLE OF CONTENTS

 

PAGE

ROUGH-IN DIMENSIONS

2

FOREWORD

2

FEATURES

3

Water Temperature Control

3-5

Water Temperature Setpoint Adjustment Procedure

5

High Limit Switch (E.C.O.)

5

Dishwashing Machine Requirement

5

Circulating Pump

6

INSTALLATION INSTRUCTIONS

6

Required Ability

6

Insulation Blankets

6

Locating The Heater

6

Clearances

7

Hard Water

7

Air Requirements

7

Mechanical Exhausting of Room Air

7

Unconfined Space

7

Confined Space

7

Chemical Vapor Corrosion

7

VENTING

7-10

Vent Pipe Termination

10

Direct Venting

10

Direct Vent Terminal Installation

10-11

Installation Sequence

11

Vertical Vent Terminal Installation

11

Installation Sequence

11-12

Installation of Vent System

12

Vent Pipe Preparation

13

CONTROLS AND SWITCHES

13

Blower Prover Switch

13

Blocked Outlet Prover Switch

13

Blocked Inlet Prover Switch

13

Low Gas Pressure Switch

13

On/Off Switch

13

Hot Surface Igniter

14

GAS PIPING

14

Connection of Gas Pipe

14-15

Purging

15

Gas Meter Size - City Gases Only

15

Gas Valves

15

SYSTEM CONNECTIONS

15

Thermometers

15

Relief Valve

15

Water Line Connections

15

 

PAGE

Closed System

15

Water (Potable) Heating & Space Heating

15-16

Heater Wiring

16-17

OPERATION

18

Sequence of Operation

18

Self Diagnostic Controller

18

Gas Value LEDs Flashing

18

Error Codes

19

Fault Conditions

19

No Incoming Line Voltage

19

No Low Voltage

19

Temperature Probe Fault

19-20

E.C.O. Switch Open

20

Control Bad

20

Combustion Air Blockage

20

PRIOR TO START-UP REQUIRED ABILITY

21

OPERATING INSTRUCTIONS

21

Adjustment Procedure (Initial Start-Up)

21-22

Lighting Instructions

22

Cathodic Protection

23

Precautions

23

GENERAL INFORMATION

23

Power Burner

23

High Limit

23

High Altitude Installations

23

MAINTENANCE

23

General

23

Maintenance Schedule

24

Flushing

24

Draining

24

Sediment Removal

24

Lime Scale Removal

24-25

Powered Anode System

25

Powered Anode Operation

25

Drain Valve and Access Panels

25

Relief Valve

25

Vent System

25

INSTALLATION DIAGRAMS

26-30

Manifold Kits

31

CHECKLIST AND SERVICE INFORMATION

32

TROUBLESHOOTING

32-34

REPLACEMENT PARTS

34

LIMITED WARRANTY

35

FEATURES

IMPORTANT

IT IS REQUIRED THAT A QUALIFIED SERVICE TECHNICIAN PERFORM THE INITIAL FIRING OF THE HEATER. AT THIS TIME THE USER SHOULD NOT HESITATE TO ASK THE TECHNICIAN ANY QUESTIONS WHICH HE MAY HAVE IN REGARD TO THE OPERATION AND MAINTENANCE OF THE UNIT.

A CHECKLIST AND SERVICE INFORMATION section are included at the rear of this manual. By using this checklist the user may be able to make minor operational adjustments and save himself unnecessary service calls. However, the user should not attempt repairs which are not listed in this section.

WATER TEMPERATURE CONTROL

DANGER

THIS WATER HEATER IS EQUIPPED WITH AN ADJUSTABLE THERMOSTAT TO CONTROL WATER TEMPERATURE. HOT WATER TEMPERATURES REQUIRED FOR AUTOMATIC DISHWASHER AND LAUNDRY USE CAN CAUSE SCALD BURNS RESULTING IN SERIOUS PERSONAL INJURY AND/OR DEATH. THE TEMPERATURE AT WHICH INJURY OCCURS VARIES WITH THE PERSON’S AGE AND TIME OF EXPOSURE. THE SLOWER RESPONSE TIME OF CHILDREN, AGED OR DISABLED PERSONS INCREASES THE HAZARDS TO THEM. NEVER ALLOW SMALL CHILDREN TO USE A HOT WATER TAP, OR TO DRAW THEIR OWN BATH WATER. NEVER LEAVE A CHILD OR DISABLED PERSON UNATTENDED IN A BATHTUB OR SHOWER.

THE WATER HEATER SHOULD BE LOCATED IN AN AREA WHERE THE GENERAL PUBLIC DOES NOT HAVE ACCESS TO SET TEMPERATURES.

The water temperature is controlled using the Temperature Control Button on the Display at the front of the unit (See Figure 1). This control utilizes two temperature probes to determine the tank temperature. The primary temperature probe is located at the top of the tank and the other is near the water inlet.

3

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A.O. Smith BTH 300A, BTH 400A warranty Table of Contents, Features

BTH 300A, BTH 400A specifications

A.O. Smith has established itself as a leader in the water heating industry, offering a range of products that combine efficiency, reliability, and innovative technology. Among these products, the BTH 300A and BTH 400A models stand out for their advanced features and robust performance, catering to both residential and commercial needs.

The BTH 300A and BTH 400A are high-efficiency water heaters designed with cutting-edge condensing technology, allowing for significant energy savings compared to traditional water heating systems. These models utilize a modulating gas valve that adjusts the burner operation based on the demand for hot water. This smart system not only enhances efficiency but also ensures a consistent supply of hot water without the worry of fluctuations.

One of the standout features of the BTH series is its compact design. Both the BTH 300A and BTH 400A are engineered to fit into smaller spaces, making them ideal for properties with limited installation areas. Their lightweight construction and user-friendly installation features further simplify the process, ensuring that homeowners and professionals alike can set them up with ease.

The BTH models are equipped with advanced control systems that offer precise temperature adjustment capabilities. Users can easily customize their hot water settings to meet specific household or business requirements. This adaptability is supported by the built-in digital display, which provides real-time information about the operating status of the unit.

Safety is a key consideration in the design of the BTH 300A and BTH 400A. They feature a robust set of safety mechanisms, including temperature lockout and venting safeguards, ensuring reliable operation and peace of mind for users. A.O. Smith also understands the importance of longevity in water heaters, and these models are built with high-quality materials, making them resistant to corrosion and wear over time.

In terms of performance, both the BTH 300A and BTH 400A models deliver exceptional heating capabilities, capable of meeting high demands while maintaining efficiency. With customer satisfaction at the forefront, A.O. Smith backs these units with an extensive warranty, demonstrating their commitment to quality and long-term performance.

In summary, the A.O. Smith BTH 300A and BTH 400A water heaters exemplify the marriage of innovation and functionality. With their energy-efficient operation, customizable settings, compact design, and advanced safety features, these models are a compelling choice for those in need of reliable and effective hot water solutions.