Maricopa Community Colleges  HVA140AH   19932-20086 
Official Course Description: MCCCD Approval: 07/22/08
HVA140AH 19932-20086 LEC 0.50 Credit(s) 0.50 Period(s)
Heat Pumps: Electricity and Control Systems II
Control systems for heat pumps. Theory of electricity as it relates to heat pump operation. Operation of electrical components and systems including common malfunctions and remedies.
Prerequisites: HVA140AG or permission of Department or Division.
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MCCCD Official Course Competencies:
 
HVA140AH   19932-20086 Heat Pumps: Electricity and Control Systems II
1. Describe the construction of ladder wiring diagrams including heat pumps low and high voltage. (I)
2. Explain the testing of switches by measuring voltage potential. (I)
3. Explain the operation of bimetal switches. (II)
4. Explain the purpose of helical bimetal. (II)
5. Explain the purpose of mercury switches. (II)
6. Explain cooling drop. (II)
7. Describe the operation of cooling anticipators. (II)
8. Describe heating drop. (II)
9. Describe the operation of heating anticipators. (II)
10. Describe the adjustment of heat anticipators. (II)
11. Describe the operation of a T87F to heat pumps. (II)
12. Describe the calibration of specific thermostats. (II)
13. Describe appropriate location of thermostats. (II)
14. Describe the major categories of electromechanical defrost systems. (III)
15. Describe temperature defrost system monitors to control defrost. (III)
16. Describe sequence of operation for temperature and pressure differential systems. (III)
17. Describe calibration and testing of temperature and pressure differential systems. (III)
18. Describe sequence-of-operation of time and temperature systems. (III)
19. Describe the testing of time and temperature systems. (III)
20. Describe theory of operation of demand defrost systems. (III)
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MCCCD Official Course Outline:
 
HVA140AH   19932-20086 Heat Pumps: Electricity and Control Systems II
    I. Control Circuits and Sequence of Operation
        A. Control circuits
          1. Common side
          2. Switching
          3. Operation
          4. Diagrams
        B. Malfunctions
          1. Open and closed switches
          2. Open or shorted coils
          3. Testing
      II. Thermostats
          A. Development
            1. Bimetal
            2. Arcing
            3. Helical bimetal
            4. Mercury switches
          B. Thermostat operation and application
            1. Cooling anticipators--cooling drop
            2. Heat anticipators--heating drop
            3. Sub bases--T87F
            4. Calibration--specific thermostats
            5. Application considerations--location
        III. Defrost Systems--Types
            A. Electromechanical
              1. Temperature differential
              2. Temperature and pressure differential
              3. Time and temperature
            B. Solid state
              1. Electronic time and temperature
              2. Demand defrost
            C. Temperature differential
              1. Electrical configuration
              2. Testing operation
            D. Pressure differential
              1. Different types
              2. Operation
              3. Testing and calibration
              4. Malfunctions
            E. Temperature and pressure differential
              1. Types
              2. Operation
              3. Testing and calibration
              4. Malfunctions
            F. Time and temperature
              1. Types
              2. Operation
              3. Testing and calibration
              4. Malfunctions
            G. Electronic timers
              1. Types
              2. Operation
            H. Demand defrost
              1. Types
              2. Operation
              3. Diagnostics
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