Maricopa Community Colleges HVA110 20006-20022

Maricopa Community Colleges HVA110 20006-20022

Official Course Description: MCCCD Approval: 06/27/00
HVA110 20006-20022	LEC	3 Credit(s)	3 Period(s)
Principles of Air Conditioning
Types and styles of cooling equipment and duct systems. Methods of supplying air to spaces for heating, cooling and heating-cooling. Human comfort factors related to heating and cooling. Psychrometric terminology and applications. Velocities for specific situations. Heat pumps: their operation, controls and metering devices. Prerequisites: HVA105 or permission of department. Corequisites: HVA110LL or permission of department.
Cross-References: FAC110

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MCCCD Official Course Competencies:

HVA110 20006-20022	Principles of Air Conditioning

1.	Review the refrigeration cycle using the basic components and explain their functions. (I)
2.	Explain the factors that lead to human comfort including the rate at which the body produces heat, body temperature, temperature-humidity relationships and type of clothing. (II)
3.	Define specific terms used in psychometrics and coordinate points on the psychometric chart to conditions of a specific residence. (III)
4.	List the components effecting cooling load and explain how they contribute to the total cooling load. (IV)
5.	Identify the specific types and styles of cooling equipment. (V)
6.	Explain the operation of major types of compressors used in air conditioning systems. (IV)
7.	Identify and explain the operation of the fixed bore and thermostatic metering devices. (VII)
8.	Explain purposes of forced-air systems and list the components. (VIII)
9.	Identify and explain the operation of safety controls including thermostats, relays, contactors, high and low pressure controls, overloads and time delay relays. (IX)
10.	Explain the operation of the compressor starting component for Permanent Split Capacitor (PSC) motors. (X)
11.	Compare and contrast operating conditions above/below design conditions. (XI)
12.	Explain how a heat pump differs from an air conditioner. (XII)
13.	List the types of heat pumps and explain the heat source and the heat rejection medium. (XIII)
14.	Explain the operation of metering devices including capillary tube, thermostatic expansion valve, electronic expansion valve and orifice metering devices. (XIV)
15.	Define terms associated with heat pumps including coefficient of performance, balance point, auxiliary heat and ambient temperature. (XV)
16.	Explain the operation of the controls used on heat pumps to include, but not limited to: low voltage thermostats, relays, heating controls, defrost timer and defrost termination thermostat. (XVI)

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MCCCD Official Course Outline:

HVA110 20006-20022	Principles of Air Conditioning

A. Components/functions

3. metering device

3. metering device

3. air movement

4. air cleanliness

B. Food energy to body energy

C. Body temperature

D. Comfort chart

1. temperature-humidity relationship

2. type of clothing

1. dry bulb (DB)

2. wet bulb (WB)

3. dew point (DP)

4. relative humidity (RH)

5. specific humidity (grains of water per lb. of air) (GR)

6. enthalpy (L) (BTU/lb.)

7. sensible heat ratio (SHR)

1. dry bulb line(s)

2. wet bulb line (s)

3. dew point line(s)

4. relative humidity lines

5. specific humidity scale

6. enthalpy scale

7. sensible heat scale

1. Room conditions

2. Sensible heat ratio line (SHRL)

3. Leaving conditions

4. Apparatus dew point

5. Sensible heat process

7. Dehumidifying

8. Cooling and dehumidifying

9. Heating and humidifying

10. Cooling and humidifying

11. Chemical dehumidifying

D. Conditions for standard air

3. 13.34 ft3/lb

C. Infiltrators

A. Evaporative coolers

B. Packaged equipment

C. Split equipment

G. Side-air-discharge

H. Top-air-discharge

A. Reciprocating

2. capillary tube

B. Thermostatic

2. internally equalized

3. externally equalized

4. types of charges

5. bulb mounting position

1. blower (fan)

2. air supply system (supply duct)

3. return air system (return duct)

5. registers IX Safety Control and Operation

2. line voltage

1. coil voltage (s)

2. voltage contact (s) switch

3. current rating

1. coil voltage (s)

2. current rating

D. Pressure switches

1. high pressure

2. low pressure

2. current active

3. heat and/or current active

F. Time delay relay (short cycle relay)

A. Running capacitor

B. Hard start kit

1. starting capacitor

2. potential relay

A. Load added by humidity

B. Outside ambient below design conditions

C. Outside ambient above design conditions

D. High efficiency - all conditions

E. Manufacturer's charts

F. Voltage at unit to unit rated voltage

C. Check valves

E. Outdoor coil

F. Defrost cycle

G. Refrigerant flow for heating and cooling

H. Comparison - air conditioner

2. water to air

3. ground to air

4. air to water

5. water to water

B. First term - heat source

C. Second term - heat rejection medium

A. Capillary tube

B. Thermostatic expansion valve

C. Electronic expansion valve

D. Orifice type

A. Coefficient of performance (COP)

B. Balance point

1. system capacity

2. building heating load

C. Auxiliary heat

2. compensate for equipment deficiency

D. Ambient temperature to heat capacity

A. Low voltage thermostats

1. single stage

C. Heating controls

1. outdoor thermostat

2. thermostatic overloads

D. Defrost timers

E. Defrost termination thermostats

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