MCCCD Official Course Competencies:

MEC226  2005 Spring – 2009 Fall

Construction Sheet Metal and Mechanical Systems I

1.

Practice field measuring techniques for measuring and fitting round, rectangular, and parallel offsets; elbows, and change joint transitions. (I)

2.

Discuss specific types of air systems including single-zone, multi-zone, variable volume/temperature, and variable air volume. (II)

3.

Discuss duct systems focusing on classification, layout, condensation, materials, and construction. (III)

4.

Examine air source equipment including packaged equipment, rooftop units, central station air-handling units, and vertical air conditioners. (IV)

5.

Discuss the basic welding practices of safety precautions, power sources/welding machines, welding equipment, electrodes, striking the arc, and electrode angles. (V)

6.

Demonstrate arc welding processes for shielded metal, carbon, gas tungsten, gas metal and spot welding including types of welds, weaving, padding, joint welds, specific arc welding positions, AC/DC machines, and other welding equipment. (VI)

7.

Discuss brazing and flame cutting including safety precautions, carbon-arc brazing, equipment set up and operation. (VII)

8.

Discuss the fundamentals of mechanical refrigeration including heat transfer, temperature and humidity, the refrigeration cycle, latent and sensible heat, air movement, energy efficiency, and refrigerants. (VIII)

9.

Examine mechanical refrigeration systems including evaporators, compressors, condensers, expansion devices, primary controls, and secondary controls. (IX)

10.

Examine specific heat pumps and related equipment location. (X)

MCCCD Official Course Outline:

MEC226  2005 Spring – 2009 Fall

Construction Sheet Metal and Mechanical Systems I

I. Field Measuring and Fitting

A. Round, rectangular, and parallel offsets.

B. Elbows

C. Change joint transitions

II. Air Systems

A. Single-zone

B. Multi-zone

C. Variable volume/temperature

D. Variable air volume

III. Duct Systems

A. Classification

B. Layout

C. Condensation

D. Materials

E. Construction

IV. Air Source Equipment

A. Packaged units

B. Rooftop units

C. Central station air-handling units

D. Vertical units

V. Welding Practices

A. Safety precautions

B. Power sources/welding machines

C. Welding equipment

D. Electrodes

E. Striking the arc

F. Electrode angles

VI. Arc Welding Processes

A. Shielded metal-arc weld

1. button and bead welds

2. weaving and padding

3. butt, lap, and joint welds

4. horizontal, vertical, overhead welding positions

B. Carbon-arc weld

1. equipment and procedures

2. electrodes and rods

3. AC/DC machines

4. alloys

5. soldering

6. galvanized steel

C. Gas tungsten-arc weld

1. advantages and limitations

2. set up

D. Gas metal arc-weld

E. Spot welding

VII. Brazing and Flame Cutting

A. Safety

B. Carbon-arc brazing

C. Equipment set up and operation

VIII. Mechanical Refrigeration Fundamentals

A. Heat transfer

B. Temperature and humidity

C. Refrigeration cycle

D. Latent and sensible heat

E. Air movement

F. Energy efficiency

G. Refrigerants

IX. Mechanical Refrigeration Systems

A. Evaporators

B. Compressors C Condensers

D. Expansion devices

E. Primary controls

1. thermostats

2. pressurestats

3. humidistats

F. Secondary controls

1. operating

2. safety

3. piping

4. lines

5. accumulators

X. Heat Pumps

A. Air-to-air

B. Water-to-air

C. Water-to-water

D. Air-to-water

E. Equipment location