TABLE OF CONTENTS

SAFE INSTALLATION, USE AND SERVICE

2

Installation of Vent System

19-21

GENERAL SAFETY

3-4

Vent Attenuation Assembly Installation Instructions

22-23

TABLE OF CONTENTS

5

Vent Pipe Preparation

24-25

INTRODUCTION

5

LIGHTING & OPERATING LABEL

26

Preparing for the Installation

5

TEMPERATURE REGULATION

27

TYPICAL INSTALLATION

6-9

FOR YOUR INFORMATION

28

ROUGH IN DIMENSIONS

8

Start Up Conditions

 

LOCATING THE NEW WATER HEATER

10-12

 

Smoke/Odor

28

Facts to Consider About Location

10-11

Thermal Expansion

28

Insulation Blankets

11

Strange Sounds

28

Combustion Air and Ventilation for Appliances

 

 

Operational Conditions

28

Located in Unconfined Spaces

11

Smelly Water

28

Combustion Air and Ventilation for Appliances

 

 

“Air” in Hot Water Faucets

28

Located in Confined Spaces

11-12

High Temperature Shut Off System

28

INSTALLING THE WATER HEATER

13-25

PERIODIC MAINTENANCE

29-31

Chemical Vapor Corrosion

13

Venting System Inspection

29

Water Piping

13-14

Burner Operation and Inspection

29

Temperature-Pressure Relief Valve

14

Burner Cleaning

29

Gas Piping

15

Housekeeping

29-30

Sediment Traps

16

Filling the Water Heater

16

Anode Rod Inspection

30

Vent Pipe Assembly

16

Temperature-Pressure Relief Valve Operation

30

Venting

16

Draining

30

Vent Pipe Termination

17

Service

31

Planning the Vent System

18

LEAKAGE CHECKPOINTS

31

Condensate

18-19

TROUBLESHOOTING

32-34

Blower Assembly Installation

19

WARRANTY

35

INTRODUCTION

Thank You for purchasing this water heater. Properly installed and maintained, it should give you years of trouble free service.

Abbreviations Found In This Instruction Manual:

CSA - Canadian Standards Association

ANSI - American National Standards Institute

NFPA - National Fire Protection Association

ASME - American Society of Mechanical Engineers

GAMA - Gas Appliance Manufacturer’s Association

UL - Underwriters Laboratories Inc.

This gas-fired water heater is design certified by Underwriters Laboratories Inc. under American National Standard/CSA Standard for Gas Water Heaters ANSI Z21.10.3 • CSA 4.3 (current edition).

PREPARING FOR THE INSTALLATION

1.Read the “General Safety” section, page 3 and 4 of this manual first and then the entire manual carefully. If you don’t follow the safety rules, the water heater will not operate properly. It could cause

DEATH, SERIOUS BODILY INJURYAND/OR PROPERTY DAMAGE.

This manual contains instructions for the installation, operation, and maintenance of the gas-fired water heater. It also contains warnings throughout the manual that you must read and be aware of. All warnings and all instructions are essential to the proper operation of the water heater and your safety. Since we cannot put everything on the first few pages, READ THE ENTIRE MANUAL BEFORE

ATTEMPTING TO INSTALL OR OPERATE THE WATER HEATER.

2.The installation must conform with these instructions and the local code authority having jurisdiction. In the absence of local

codes, the installation must comply with the current editions of the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and the National Electrical Code, NFPA 70 or CAN/CSA-B149.1, the Natural Gas and Propane Installation Code and CSA C22.1, the Canadian Electrical Code. All documents are available from the Canadian Standards Association, 8501 East Pleasant Valley Road, Cleveland, OH 44131. NFPA documents are also available from the National Fire Protection Association, 1 Batterymarch Park, Quincy, MA 02269.

3.The water heater when installed must be grounded in accordance with the local codes, or in the absence of local codes: the National Electrical Code (NFPA 70) or the Canadian Electrical Code (C22.1).

4.If after reading this manual you have any questions or do not understand any portion of the instructions, call the local gas utility or the manufacturer whose name appears on the rating plate.

5.Carefully plan the place where you are going to put the water heater. Correct combustion, vent action, and vent pipe installation are very important in preventing death from possible carbon monoxide poisoning and fires, see Figures 1 and 2.

Examine the location to ensure the water heater complies with the “Locating the New Water Heater” section in this manual.

6.For California installation this water heater must be braced, anchored, or strapped to avoid falling or moving during an earthquake. See instructions for correct installation procedures. Instructions may be obtained from California Office of the State Architect, 400 P Street, Sacramento, CA 95814.

7.Massachusetts Code requires this water heater to be installed in accordance with Massachusetts 248-CMR 2.00: State Plumbing Code and 248-CMR 5.00.

8.Complies with SCAQMD rule #1146 and districts having equivalent NOx requirements.

5

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A.O. Smith W/HOT instruction manual Table of Contents, Introduction

W/HOT specifications

A.O. Smith, a leading manufacturer of water heating solutions, has made its mark in the industry with innovative products that combine efficiency, reliability, and advanced technology. Among its standout offerings is the A.O. Smith W/HOT series, designed to meet the diverse needs of residential and commercial customers.

The W/HOT series showcases a variety of tankless water heaters characterized by their ability to provide endless hot water on demand. Unlike traditional tank water heaters, which can run out of hot water during heavy usage, the W/HOT series ensures a constant supply, making it an ideal choice for families and businesses with high hot water needs. This feature not only enhances convenience but also optimizes energy usage by eliminating the standby heat loss associated with storage tanks.

One of the key technologies integrated into the W/HOT series is the microprocessor control system. This intelligent technology allows the unit to monitor water usage patterns and adjust operation accordingly. By optimizing heating cycles based on actual demand, this feature helps improve energy efficiency, resulting in lower utility bills without compromising performance.

The W/HOT series also incorporates advanced heat exchanger technology, enabling rapid heating of water as it passes through the system. This means minimal wait time for hot water and reduced energy consumption, as the unit only heats water when it is needed. The heat exchangers are designed for durability and effective heat transfer, helping to extend the overall lifespan of the unit.

Safety is a top priority in the design of A.O. Smith water heaters. The W/HOT series is equipped with multiple safety features, including a built-in thermal shut-off switch and safety sensors that prevent overheating. Additionally, the units are designed to comply with industry standards and regulations, ensuring peace of mind for users.

Installation flexibility is another defining characteristic of the W/HOT series. These tankless water heaters can be installed in various locations, requiring minimal space compared to traditional units. Their compact design makes them suitable for tight spaces, such as closets or utility rooms.

Overall, the A.O. Smith W/HOT series represents a commitment to innovation and quality in water heating solutions. Its combination of tankless design, advanced technology, and safety features makes it an excellent choice for those seeking efficient and reliable hot water access. Whether for residential or commercial use, A.O. Smith continues to lead the way in delivering top-tier water heating solutions that meet the evolving needs of consumers.