MCCCD Official Course Competencies:

ELC105  20022-20022

Electricity for Industry (HVAC&R)

1.

Explain the relationships and electrical charges of basic parts of atoms. (I)

2.

Compare and contrast good conducting materials and good insulating materials. (II)

3.

Define electricity and magnetism and explain their applications to heating, ventilating and air conditioning equipment. (III)

4.

Draw basic and complex electrical circuits, using appropriate symbols and conventions. (IV)

5.

Define terms related to specific electrical quantities, state Ohm's Law and solve specific problems using Ohm's law equations. (V)

6.

Explain the operation of and safety standards for use of electrical meters for heating, ventilating, air conditioning and refrigerating that determine voltage, resistance, and current. (VI)

7.

Calculate resistive electrical loads for series, parallel and series-parallel circuits, using rules for each type of circuit and Ohm's law equations. (VII)

8.

Define specific terms associated with air conditioning electrical power sources and alternating power production and evaluate specific electrical sources at location, determining voltage, phase and type of transformer service. (VIII)

9.

Explain types of reactive loads and power factors of those loads related to heating, ventilating air conditioning and refrigeration. (IX)

10.

Explain the effects of capacitive and inductive components on voltage and current in terms of phase angle relationships. (IX, XI)

11.

Define electro-magnetic solenoid, explain its function and relationship to relays, contactors, magnetic line starters, and solenoid valves. (IX, XII)

12.

Given resource materials, calculate wire size based upon wire resistance, length of run, load, temperature and other derating factors. (X)

13.

List the major sections of the National Electric Code. (X)

14.

List the types of single phase motors, explain how the electrical fields produce rotating effects and determine winding resistance of hermetic compressor motors and motor terminals. (XI, XII)

15.

Explain the operation of motor overloads including solder melting and thermal overloads. (XII)

16.

Diagram the wiring of the basic refrigeration system, explain the function of each of the components and perform basic problem analysis and troubleshooting functions on the circuit. (XII)

17.

Explain the principle of the P-N junction. (XIII)

18.

Explain the basic functions and applications of diodes, transistors, diacs, triacs and SCR's. (XIII)

MCCCD Official Course Outline:

ELC105  20022-20022

Electricity for Industry (HVAC&R)

I. Basic Atomic Structure

A. The Nucleus

1. proton

2. neutron

B. The Electron shells

1. electron

2. valence

II. Material Differentiation

A. Conductors

1. number of electrons in valance shell

2. distance of valance shell from nucleus

B. Insulators

1. number of electrons in valance shell

2. distance of valance shell from nucleus

C. Semiconductors

1. number of electrons in valance shell

2. distance of valance shell from nucleus

III. Electricity and Magnetism

A. Magnetism

1. polarity

2. attraction and repulsion

3. lines of force

B. Electric current

1. electron flow

2. polarity

3. attraction and repulsion

4. electromagnetic fields

5. direct and alternating current

IV. The Basic Electrical Circuit

A. Power supply, conductor, switch, load

B. Electrical drawings

1. ladder diagrams

2. schematic (point-to-point) wiring diagrams

3. electrical symbols

V. Electrical Terms, Ohm's Law, and Equations

A. Terms

1. coulomb

2. ampere

3. voltage

4. ohm

5. watt

B. Ohm's law

1. statement

2. equation

C. Equations

1. E=IR

2. P=IE

VI. Electrical Meter Operations/Safety/Purpose

A. Volt meter

B. Ammeter

C. Ohmmeter

D. Readings

1. analog

2. digital

VII. Resistance Loads

A. Resistors

1. fixed

2. variable

3. electric heating elements

B. Series

1. total resistance

2. current

3. voltage

4. rules

5. equations

C. Parallel

1. total resistance

2. current

3. voltage

4. rules

5. equations

D. Series-parallel

1. rules

2. equations

VIII. Electrical Services

A. Definition of terms

1. hertz

2. single phase

3. three phase

4. delta

5. wye

6. phase voltage

7. line voltage

8. phase current

9. line current

10. phase angle

11. power factor

B. Evaluation of sources/voltage/phase/type

1. transformers (Power)

2. loads

3. alternating power generation

4. open delta

C. Distribution panel box(es)

1. phasing

2 circu.Reactive Loads

A. Inductive loads

1. relays

2. motors

3. chokes

4. phase angle shift

5. parallel and series inductive loads

B. Capacitive loads

1. capacitors

2. phase angle shift

3. parallel and series capacitors

C. Combination loads

1. calculations

2. power factor correction

X. Wire Sizing/Code/Insulation

A. Wire resistance

1. diameter

2. type of materials

3. length

4. load

5. temperature

6. other factors

B. National Electrical Code (NEC)

1. specific reference

2. other notes

C. Insulation

1. type

2. voltage rating

XI. Single Phase Motors

A. Types

1. split phase

2. shaded pole

XII. Basic Refrigeration System Wiring

A. Refrigeration compressors / motors

1. windings

2. starting

3. reversing the direction

4. dual voltage

5. starting capacitors

6. running capacitors

7. terminal identification

B. Motor overloads

1. solder melting

2. thermal (bimetal)

C. Electro-magnetic solenoid

1. definition

2. function

D. Control Devices

1. time clocks

2. thermostats

3. temperature switches

4. pressure switches

E. Control wiring

F. Trouble-shooting

XIII. Semiconductors

A. Semiconductor manufacturing

1. the P-N junction

2. trivalent and pentavalent doping

B. Semiconductor devices

1 diode

2. transistors

3. SCR's

4. diacs and triacs

C. Integrated Circuits

1. timers

2. operational amplifiers

3. logic gates