Revised 01/2013

AIR 257 - Gas Fired Warm Air Furnaces (4 CR.)

Course Description

Covers the study of mid and high efficiency gas-fired warm air furnaces and their components. Includes equipment components, installation, servicing and maintenance. Lecture 3 hours. Laboratory 3 hours.

General Course Purpose

To increase student knowledge and technical skills specifically related to medium and high efficiency gas-fired furnaces.

Course Prerequisites/Corequisites

Prerequisite: AIR 154

Course Objectives

Upon completion of this course, the student should be able to:

• Identify the components of mid and high efficiency furnaces and demonstrate repair and replacement
• Identify the components of combustion and combustion by-products and describe their importance
• Describe the sequence of operation of mid and high efficiency furnaces
• Describe the design and categories of vent systems of warm air fossil fuel furnaces
• Size gas pipes
• Install flue or venting for different furnaces
• Wire high- and low-voltage furnaces
• Comply with mechanical, plumbing, and electrical codes
• Troubleshoot problems with heating by gas-fired furnaces and fix them
• Recommend the correct furnace for different sites
• Describe the importance and procedures for yearly maintenance and troubleshooting

Major Topics to Be Included

• Conditions that affect comfort
• Estimating the heating load
• Evaluating a heating system
• Supply air distribution - return air distribution
• Installation procedures
• Combustion, combustion by-products
• Instruments used in testing
• Components of warm-air furnace
• Components of mid and high efficiency gas fired warm-air furnaces
• Characteristics of mid and high efficiency warm-air furnaces
• Wiring diagrams and components
• Heating system maintenance
• Energy conservation
• Retrofit procedures and pre-job survey and assessment