A.O. Smith T-H3-DV - User Manual

Gas Tankless Water Heater
TM
Suitable for potable water heating and space-heating
Please refer to local codes for space-heating compliance.
540 (T-H3)
model only
If you have any questions, please
call or write to:
500 Tennessee Waltz Parkway
Ashland City, TN 37015
Toll Free: 1-877-737-2840
WARNING
- Do not store or use gasoline or other
flammable vapors and liquids in the vicinity
of this or any other appliance.
- WHAT TO DO IF YOU SMELL GAS
• Donottrytolightanyappliance.
• Donottouchanyelectricswitch,donot
use any phone in your building.
• Immediatelycallyourgassupplierfrom
a neighbor's phone. Follow the gas
supplier's instructions.
• Ifyoucannotreachyourgassupplier,call
the fire department.
- Installation and service must be performed
by a qualified installer, service agency or the
gas supplier.
On-Demand Water Heater
Installation Manual and Owner’s Guide
ANSI Z21.10.3 and CSA 4.3
If the information in these
instructions is not followed
exactly, a fire or explosion may
result causing property damage,
personal injury or death.
FEATURING
• ENDLESSHOTWATER
• ON-DEMANDUSAGE
• COMPACT,SPACESAVING
• ENERGYCONSERVATION
• COMPUTERIZEDSAFETY
• NOPILOTLIGHT
• Satisfiesthe2012SCAQMDRule
1146.2 for Ultra-Low NOx
Emissions
• EASY-LINKSYSTEMAND
MULTI-UNIT SYSTEM
(540 (T-H3) model only)
Models
• 240Outdoor(T-H3J-OS)
• 340Outdoor(T-H3S-OS)
• 540Outdoor(T-H3-OS)
• 240Indoor(T-H3J-DV)
• 340Indoor(T-H3S-DV)
• 540Indoor(T-H3-DV)
Downloaded from http://GadgetsGo.com Authorized Dealer

Summary

Installation Manual

Specifications

Detailed technical specifications for the water heater models.

Introduction

Overview of the manual's content and the water heater's function.

Safety Guidelines

Essential safety rules, definitions, and precautions for installation and use.

Safety Definitions

Defines hazard symbols like Danger, Warning, and Caution for safety.

General Safety Precautions

General safety rules and compliance for installation and operation.

Installation

Procedures and considerations for installing the water heater.

General Installation Guidelines

General rules, codes, and location considerations for installation.

Installation Clearances

Required minimum clearances around the water heater for installation.

Included Accessories

List of accessories that should be included with the water heater.

Optional Items

List of optional accessories available for the water heater.

Installation Warnings

Critical warnings and prohibitions for safe water heater installation.

High-Altitude Installations

Instructions for adjusting DIPswitches for high-altitude installations.

Venting Instructions

Guidelines and rules for proper venting of the water heater.

General Venting Rules

General rules for installing water heater vents and terminations.

DIPswitch Settings for Vent Length

DIPswitch settings based on vent length for proper operation.

Exhaust Vent Materials (Plastic)

Guidelines for using plastic vent materials like ABS, PVC, CPVC.

Two-Pipe Direct-Vent Illustrations

Illustrations for typical two-pipe direct-vent installations.

Single-Pipe Room-Air Intake Illustrations

Illustrations for typical single-pipe room-air intake installations.

Exhaust Vent Materials (Stainless Steel)

Guidelines for using stainless steel vent materials for Category IV appliances.

Direct-Vent and Single Vent Illustrations

Illustrations for direct-vent and single vent installations.

Common-Venting System

Information and examples for common-venting multiple water heaters.

Common-Venting System Sizing

Determining vent diameter and length for common-venting systems.

Vent Termination Clearances

Required clearances for vent terminations to ensure safety.

Sidewall Vent Terminations

Specific clearance requirements for sidewall vent terminations.

Rooftop Vent Terminations

Clearance requirements for rooftop vent terminations.

Gas Supply and Pipe Sizing

Guidelines for correctly sizing gas supply lines and meters.

General Gas Supply Guidelines

General precautions and requirements for gas supply and installation.

Gas Connections

Steps for connecting the gas supply to the water heater.

Natural Gas Supply Piping

Capacity charts for natural gas supply piping based on size and length.

Propane (LP) Supply Piping

Capacity charts for propane supply piping based on size and length.

Measuring Inlet Gas Pressure

Procedure for measuring inlet gas pressure, to be performed by a professional.

Water Connections

Instructions for connecting water supply lines to the water heater.

Pressure Relief Valve Installation

Requirements and installation guidelines for the pressure relief valve.

Condensate Drain

Information and recommendations for condensate drainage.

Condensate Drain Connections

Procedure for connecting the condensate drain, with or without a neutralizer.

Electrical Connections

Guidelines for proper electrical grounding and connection.

Temperature Remote Controller

Information about the temperature remote controller.

Remote Controller Installation

Instructions for mounting and wiring the remote controller.

Easy-Link System

Information on connecting multiple water heaters in a manifold system.

Easy-Link System Overview

Overview of connecting multiple units for manifold operation.

Easy-Link Connection Procedures

Step-by-step guide for connecting units in the Easy-Link System.

Easy-Link DIPswitch Settings

Configuration of DIPswitches for Easy-Link system setup.

Easy-Link System Connection Diagram

Diagram illustrating connections between units in an Easy-Link System.

Easy-Link System Common Errors

Illustrates incorrect DIPswitch settings and connection examples.

Multi-Unit System

Information on connecting multiple water heaters with a multi-unit controller.

Multi-Unit System Connection Diagram

Diagram showing connections for multi-unit controller setup.

Applications

Describes various applications and usage scenarios for the water heater.

Space-Heating Applications

Guidelines for using the water heater for space heating.

Recirculation System

Diagram and notes for setting up a recirculation pump system.

Dual-Purpose Heating Applications

Diagram for domestic and space heating per Mass. code.

Initial Operation

Steps and checks for initial setup and operation of the water heater.

Pre-Operation Safety Checks

Essential safety checks and warnings before operating the unit.

Operating Procedures

Step-by-step guide for starting and operating the water heater.

Owners Guide

Operating Safety

Crucial safety information and warnings for operating the water heater.

Pre-Operation Safety Instructions

Critical safety warnings and procedures before operating the unit.

Operating Instructions

Step-by-step guide for starting and running the water heater.

Turning Off Gas Supply

Procedure for safely turning off the gas supply to the appliance.

Normal Operation

How to operate the water heater during normal use.

Temperature Controller and Remote Controller

Overview and function of the temperature and remote controllers.

General Operation Notes

General notes on operation, including flow rates and energy saving.

Temperature Settings

Instructions and tables for setting and adjusting water temperatures.

Setting the Temperature

Instructions for adjusting the water temperature using controllers.

Controller Temperature Table

Table showing temperature outputs for different models and settings.

Additional Features

Details on extra features like information and unit conversion modes.

Information Mode

How to view inlet/outlet temperature, and water flow.

Unit Conversion Mode

How to switch between Fahrenheit/Celsius and GPM/LPM.

PCB Temperature Settings

Temperature settings adjustable via DIPswitches on the PCB.

Flow Rate Specifications

Maximum flow rates for different models and their performance.

Freeze Protection System

Explanation of the freeze protection system and its operation.

Maintenance and Service

Procedures for routine maintenance and servicing of the water heater.

Unit Draining and Filter Cleaning

Procedure for draining the unit and cleaning the cold water inlet filter.

Troubleshooting

Guidance for diagnosing and resolving common problems.

General Troubleshooting

Common problems and their solutions related to hot water delivery.

Water Heater Troubleshooting

Troubleshooting issues related to unit ignition, fan operation, and abnormal sounds.

Controller Troubleshooting

Troubleshooting issues with the temperature or remote controller display.

Easy-Link System Troubleshooting

Troubleshooting for Easy-Link systems, including error codes and unit numbering.

Error Codes

List and explanation of error codes displayed by the unit.

General Error Code Information

Explanation of how error codes are displayed and general error code indicators.

Single Unit Error Codes

Specific error codes and their meanings for single unit installations.

Easy-Link System Error Codes

How error codes are displayed in Easy-Link systems, indicating unit number.

Fault Analysis of Error Codes

Detailed breakdown of error codes and their potential causes.

Components Diagram

Exploded views and diagrams of the water heater's components.

Case Assembly Diagrams

Exploded views of the indoor and outdoor unit case assemblies.

Remote Controller Diagram

Diagram of the temperature remote controller components.

Temperature Controller Diagram

Diagram of the indoor model temperature controller.

Computer Board Assembly Diagrams

Diagrams of the computer board assemblies for different models.

Surge Box Assembly Diagram

Diagram of the surge box assembly.

Burner Assembly Diagram

Exploded view of the burner assembly and its components.

Water Way Assembly Diagrams

Diagrams of the water way assemblies for different models.

Parts List

List of replacement parts with item numbers and part numbers.

Output Temperature Chart

Charts showing output temperature vs. flow rate for various inlet temperatures.

Limited Warranty

Details of the manufacturer's limited warranty terms and conditions.

A.O. Smith T-H3-DV Specifications

General

Brand	A.O. Smith
Model	T-H3-DV
Category	Water Heater
Language	English