MCCCD Official Course Competencies:

HVA112LL  2004 Fall – 2011 Fall

Heating and Air Conditioning Lab

1.

After correctly locating components of specific air conditioning systems, explain their functions. (I)

2.

Evaluate air conditioners and/or heat pumps for energy balance. (II)

3.

Predict operating conditions for air conditioning units, heat pumps and furnaces operating outside of design operating conditions. (III)

4.

Using the correct testing equipment, diagnose problems including low refrigerant charge, inappropriate gas pressure, dirty burners or obstructed filters. (III, V, VI)

5.

Using the appropriate electrical testing equipment diagnose electrical problems including fuses, thermocouples, switches, gas valves, relay coils, thermostats, broken/missing wires while adhering to appropriate safety measures. (IV)

6.

After correctly locating components of specific forced air heating systems, explain their functions and adjustment. (V, VI)

7.

Recover refrigerants in package A/C and heat pumps systems. (VII)

8.

Charge refrigerants in package A/C and heat pump systems. (VII)

MCCCD Official Course Outline:

HVA112LL  2004 Fall – 2011 Fall

Heating and Air Conditioning Lab

I. Components Location/Function

A. Compressor

B. Condenser

C. Metering device

D. Evaporator

E. Supply duct

F. Return duct

G. Balancing dampers

H. Supply diffusers

I. Return grills

II. Energy Balance

A. Evaporator

1. CFM

2. Difference in temperature

3. Calculate British Thermal Unit (BTU) absorbed

B. Compressor energy

1. Voltage

2. Current

3. Power factor

4. Electrical energy to British Thermal Unit (BTU)

C. Condenser

1. CFM

2. Difference in temperature (DT)

3. Calculate BTU

4. Energy

III. Operating Conditions Outside Design Conditions

A. High indoor humidity

B. High indoor temperature

C. High indoor temperature and humidity

D. Low indoor temperature

E. High outdoor temperature

F. Low outdoor temperature

IV. Electrical Problems

A. Open fuses

B. Broken/missing wires

C. Defective contacts

E. Other

F. Safety

V. Gas-Fired Heaters

A. Gas orifices, burners, and flames

1. Orifices

2. Main gas burners

3. Forced draft burners

4. Pilot burners

5. Electric ignition

6. Flame types

B. Heat exchangers

1. Primary heat exchangers

2. Secondary heat exchangers

C. Troubleshooting and repair

D. Safety

VI. BTU Adjustments

A. Meter timing

B. Regulator adjustment

C. Gas piping

D. Orifice size

VII. Refrigerants

A. Safe handling

B. Recovery

C. Charging