Atwood 79 Series - User Manual

1
September 2003
INTRODUCTION
The 2004 edition of the Atwood Furnace Service Manual is a resource created to help
service technicians identify Atwood product by serial number, diagnose service
problems and efficiently and effectively process warranty claims.
Changes to the Hydro Flame furnaces include:
• Ignition boards in the 79, 85 and 89 series furnaces now have the blower relay
incorporated into the PC board. These boards are compatible with previous Hydro
Flame furnaces. There is no longer a remote relay.
• New boards have a diagnostic ability with 4 fault codes.
• Furnaces with no outside access doors (only an exhaust vent) became available in
2003; the initials L/D in the model number identify these models. The gas valve was
re-oriented with a longer inlet manifold to make this possible.
Each of the manuals within this series offers a general overview of the product as well
as more specific product information. For each product within the manual, you will find
model identification, recommended tools and equipment, a sequence of operation,
warnings, annual maintenance procedures, parts and troubleshooting guides, warranty
procedures, flat rate schedules, and replacement part reference charts.
Due to the rapidly changing personal computer revolution we have placed
troubleshooting information in a variety of places to make sure that the most accurate
information is available. The best place to find the current information about Atwood
products is our website: www.atwoodmobile.com. At our website brochures may be
downloaded, trouble shooting guides reviewed and the latest information bulletins can
be read. In addition all Atwood Authorized Service Centers are listed on our site,
accessible via an easy-to-use search system.
Service for all Atwood products is handled out of our Rockford location. Should you
have any questions regarding our products or the information contained in this manual
simply dial 1-800-825-4328. Be sure to have the Model and Serial Number when you call.
Atwood Service Department
Disclaimer: The data presented in this publication is obtained from the most reliable sources, and is believed to be accurate as of the date of publication.
Responsibility for typographical errors or omission of data cannot be assumed by the publishers.

Summary

Introduction and Overview

Changes to Hydro Flame Furnaces

Details on updates and modifications in the 2004 edition of the furnace service manual.

Atwood Support Information

Contact and resource information for Atwood products and service.

Tools, Model Identification, and Wiring

Recommended Tools and Equipment

Lists essential tools and equipment for furnace service and diagnosis.

Model Identification Guides

Guides for identifying different Atwood furnace models and their features.

Wiring Diagrams

Schematic diagrams illustrating furnace electrical connections for various series.

Operation and Maintenance

Sequence of Operation

Step-by-step explanation of furnace start-up and heating cycles.

Installation Criteria

Critical safety and installation requirements for furnaces.

Preventative Maintenance

Guidelines for annual inspection and safety checks.

Components and Troubleshooting

Key Furnace Components

Descriptions of major furnace parts like thermostats, circuit boards, and gas valves.

Troubleshooting Guides

Guides to diagnose and resolve common furnace issues.

Warranty, Parts, and Terminology

Furnace Terminology

Definitions of technical terms used in furnace service.

Warranty and Claims

Procedures for processing warranty claims and return goods.

Parts Reference

Reference charts for replacement parts and flat rate schedules.

Atwood 79 Series Specifications

General

Brand	Atwood
Model	79 Series
Category	Furnace
Language	English