Official Course Description:   MCCCD Approval:  06/27/00
HVA105      19996-20004	LEC	3 Credit(s)	3 Period(s)
Electricity for Air Conditioning (HVAC&R)
Overview of electricity related to air conditioning. Operation of and safety for use of electrical meters, calculating electrical loads and evaluation of air conditioning power sources. Types of single phase motors and determining resistance of compressor motors and motor terminals. Function of electro-magnetic solenoids and transformers. Calculations of transformer voltage/current relationship. Prerequisites: None. Corequisites: FAC/HVA105LL or permission of instructor.
Cross-References:   FAC105

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MCCCD Official Course Competencies:
HVA105   19996-20004	Electricity for Air Conditioning (HVAC&R)

1.	Explain the relationships and electrical charges of basic parts of atoms. (I)
2.	Compare and constrast good conducting materials and good insulating materials. (II)
3.	Define terms related to specific electrical quantities, state Ohm's Law and solve specific problems using Ohm's law equations. (III)
4.	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. (IV)
5.	Calculate electrical loads for series, parallel and series-parallel circuits, using rules for each type of circuit and Ohm's law equations. (V)
6.	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 oftransformer service. (VI)
7.	Given resource materials, calculate wire size based upon wire resistance, length of run, load, temperature and other derating factors. (VII)
8.	Explain types of loads and power factors of those loads related to heating, ventilating air conditioning and refrigeration. (VIII)
9.	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. (IX)
10.	Explain the operation of motor overloads including solder melting and specific thermal overloads. (X)
11.	Define electro-magnetic solenoid, explain its function and relationship to relays, contactors, and magnetic line starters. (XI)
12.	Define terms and explain function/operation of transformers and calculate tranformer voltage/current relationship. (XII)

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MCCCD Official Course Outline:
HVA105   19996-20004	Electricity for Air Conditioning (HVAC&R)

I. Basic Atomic Structure A. Neutron 1. parts 2. electrical charge 3. relationship a. nucleus b. shells B. Proton 1. parts 2. electrical charge 3. relationship a. nucleus b. shells C. Electron 1. parts 2. electrical charge 3. relationship a. nucleus b. shells 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 III. Electrical Terms, Ohm's Law, and Equations A. Terms 1. coulomb 2. ampere 3. voltage a. electromotive force b. electrical pressure 4. ohm 5. watt B. Ohm's Law 1. statement 2. equation C. Equations 1. E = 1R 2. 1 = E/R 3. R = E/1 IV. Electrical Meter Operations/Safety/Purpose A. Volt meter B. Ammeter C. Ohmmeter D. Readings 1. analog 2. digital V. Electrical Circuits Loads A. Series 1. total resistance 2. current 3. voltage 4. rules 5. equations B. Parallel 1. total resistance 2. current 3. voltage 4. rules 5. equations C. Series-parallel 1. rules 2. equations VI. Electrical Services A. Definition of terms 1. hertz 2. single phase 3. three phase 4. delta a. closed b. open c. wild leg 5. wye 6. phase voltage 7. line voltage 8. phase current 9. line current B. Evaluation of sources/voltage/phase/type 1. transformers (Power) a. delta b. wye 2. loads a. delta b. wye 3. alternating power generation 4. open delta 5. panel box(es) a. single phase b. three phase c. fuse type d. circuit breaker type e. sub-panels VII. 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 VIII. Electrical Loads/Power Factors A. Resistive B. Inductive C. Capacitive D. Inductive - reactance E. Capacitive - reactance IX. Single Phase Motors A. Types 1. split phase a. induction-start-induction-run (ISIR) b. capacitor-start-induction-run (CSIR) c. capacitor-start-capacitor-run (CSCR) d. permanent split capacitor (PSC) 2. shaded pole a. shading coil b. direction B. Electrical fields - Components 1. windings a. start windings b. run winding c. speed of motor 2. starting a. centrifugal switch b. potential relay c. current relay 3. reversing the direction 4. dual voltage 5. starting capacitors 6. running capacitors C. Characteristics - Torque D. Terminal identification 1. motor windings a. start b. run 2. terminals a. identification b. resistance to ground X. Motor Overloads A. Solder melting B. Thermal (bimetal) 1. two-wire 2. three-wire 3. four-wire 4. other XI. Electro-Magnetic Solenoid A. Definition B. Function 1. shading coil 2. laminated core C. Relationship 1. relay 2. contactor 3. magnetic line starter (motor starters) XII. Transformers A. Terms 1. mutual inductors 2. primary winding 3. secondary winding 4. step-up 5. step-down B. Operation/function C. Calculations 1. current 2. VA (voltamp)

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