Standarfd

 Posted: 08/10/04

ACT 104 – Electric Motors

Course Description

Continues the development of skills and knowledge necessary for application and service of electric motors commonly used by the refrigeration and air conditioning industry. Topics include: diagnostic techniques, capacitors, installation procedures, types of electric motors, electric motor service, and safety.

 

Competency Areas

Hours

 

Diagnostic Techniques

Class

2

Capacitors

D. Lab

2

Installation Procedures

P. Lab/O.B.I.

3

Types of Electric Motors

Credit

4

Electric Motor Service

 

 

Safety

 

 

 

Prerequisite/Corequisite:

ACT 103

 

Course Guide

 

Competency

After completing this section, the student will:

Hours

Class

D.Lab

P.Lab/

O.B.I.

DIAGNOSTIC TECHNIQUES

3

3

5

Drive belt and pulley theory

Discuss the four types of belt and pulley drivers.

 

 

 

Safety considerations

Discuss safety concerns found in working with motors, pulleys, and drive belts.

 

 

 

Belt guards

Inspect the belt guards on lab equipment.

 

 

 

Belt and pulley installation

Remove or install belts.

 

 

 

 

Remove or install pulleys.

 

 

 

Belt alignment and adjustment

Adjust belt tension, such as V-belts or drive belts.

 

 

 

 

Adjust pulleys.

 

 

 

 

Align motors.

 

 

 

 

Align pulleys.

 

 

 

CAPACITORS

1

4

5

Theory

Define a capacitor.

 

 

 

 

Define the term microfarad.

 

 

 

Applications

Observe the use of capacitors on lab equipment.

 

 

 

Troubleshooting

Properly test various capacitors with volt ohm millimeter (VOM) and capacitor tester.

 

 

 

Safety

Demonstrate how to properly discharge capacitor.

 

 

 

INSTALLATION PROCEDURES

3

3

10

Application

Install electric motors.

 

 

 

TYPES OF ELECTRIC MOTORS

9

5

5

Theory

Explain principles of motor operation.

 

 

 

 

Connect three phase motor starting components.

 

 

 

Identifying motor types

Classify motors used in the HVAC industry.

 

 

 

Introducing motor applications

Discuss motor applications.

 

 

 

Starting single phase motors and motor protection devices

Describe methods of starting and protecting electrical motors.

 

 

 

 

Differentiate between motor windings.

 

 

 

 

Connect single-phase motor starting components.

 

 

 

Starting three phase motors and motor protection devices

Describe methods of starting and protecting electrical motors.

 

 

 

 

Differentiate between motor winding.

 

 

 

ELECTRIC MOTOR SERVICE

3

5

5

Service and Troubleshooting

Check motors for proper rotation.

 

 

 

 

Isolate electric motor malfunctions.

 

 

 

 

Discuss installation of bearings on shafts.

 

 

 

 

Remove or install electric motor components.

 

 

 

 

Remove or install electric motors.

 

 

 

 

Remove or install fans or blowers.

 

 

 

 

Reverse motor current rotation.

 

 

 

 

Measure motor current draw.

 

 

 

 

Reset motor thermal overloads

 

 

 

 

Test motor running or starting windings.

 

 

 

 

Test starting or running capacitors.

 

 

 

 

Wire in motors to power source.

 

 

 

SAFETY

1

0

0

Safety hazards

Discuss the safety hazards found in working with electric motors and their components.

 

 

 

 

Suggested Resources

 

Althouse, A. D., et al. (1988). Modern refrigeration & air conditioning. South Holland, IL: Goodheart-Willcox. http://www.goodheartwillcox.com/.

Haines, R. (1987). Control systems for heating, ventilating, & air conditioning (4th ed.). New York: Van Nos Reinhold.

Herman, S. L., & Sparkman, B. L. (1986). Electricity & controls for heating, ventilating, & air conditioning (4th ed.). Albany, NY: Delmar. http://www.delmar.com/.

Langley, B. C. (1985). Control systems for air conditioning & refrigeration. Englewood Cliffs, NJ: Prentice Hall. http://www.cefga.org/.

Langley, B. C. (1986). Cooling systems troubleshooting handbook. Englewood Cliffs, NJ: Prentice Hall. http://www.cefga.org/.

Langley, B. C. (1988). Electric controls for refrigeration & air conditioning (2nd ed.). Englewood Cliffs, NJ: Prentice Hall. http://www.cefga.org/.

Long, W. (1985). Refrigeration & air conditioning: Operation & analysis servicing. New York: Macmillan. http://www.macmillan.com/.

Miles, L. (1987). Refrigeration & air conditioning (2nd ed.). Englewood Cliffs, NJ: Prentice Hall. http://www.cefga.org/.

Miller, R. (1983). Refrigeration and air conditioning technology. New York: Bennett Il.

Miller, R. (1988). Electricity for heating, air conditioning & refrigeration. San Diego, CA: Harcourt Brace Jovanovich. http://www.harcourt.com/.

National Center for Construction Education and Research (latest edition). NCCER: Core Curricula:  Basic Communication Skills. Englewood Cliffs, NJ: Prentice Hall. http://www.cefga.org/.

Prasad, M. (1983). Refrigeration & air conditioning. New Delhi: Wiley Eastern, Ltd. http://www.wiley.com/.

Rudman, J. (1991). Air conditioning, heating & refrigeration mechanic. Syosset, NY: National Learning.

Smith, R. E. (1987). Electricity for refrigeration, heating & air conditioning. Albany, NY: Delmar. http://www.delmar.com/.

Swenson, S. D. (1990). Troubleshooting & servicing air conditioning equipment. Troy, MI: Busn News.

Terminology of heating, ventilation, air conditioning, & refrigeration. (1986). Atlanta: American Heating, Refrigeration, & Air Engineering.

Whitman, W., & Johnson, W. (1991). Refrigeration & air conditioning technology (2nd ed.). Albany, NY: Delmar. http://www.delmar.com/.