HCR 256 - Applied Heating & AC

1. Electric Diagrams
   1. Identify symbols used for common electrical components
   2. Explain the characteristics of different types of electrical diagrams.
   3. Interpret different types of electrical diagrams.
   4. Trace an electrical circuit on a ladder diagram.
   5. Draw a ladder-type diagram.
2. Control Systems
   1. Explain the purpose of a control system.
   2. List the different types of control systems.
   3. Explain the difference between open and closed loop control systems.
   4. Identify standard terminal designations in residential HVACR control systems.
   5. Use schematic diagrams to describe the operating sequence of standard HVACR equipment.
3. Heat Pump Fundamentals
   1. Describe what a heat pump is.
   2. Describe the cooling, heating and defrost cycle.
   3. Explain the operation of the reversing valve.
   4. Define heat source and heat sink.
   5. List the types of heat pump systems and configurations.
   6. Discuss the operation of metering devices and check valves used in heat pumps.
   7. Explain the purpose of suction accumulators and heating-cycle charge compensators.
   8. Explain the different types of efficiency ratings used for heat pumps.
4. Residential Load Calculations
   1. Discuss the importance of a heat load calculation.
   2. Explain the difference between heat loss, sensible heat gain and latent heat gain.
   3. Construct a U factor for a building panel given the R values of the components.
   4. Construct an HTM given a U factor and a design temperature difference.
   5. Discuss the effect that daily temperature swings have on heat gain.
   6. Explain the difference that house orientation has on solar heat gain.
   7. Do a load calculation on a home, using Manual J 7th edition.
5. Duct Design
   1. List the three overall goals in duct design.
   2. List the different duct design methods.
   3. Discuss how to determine the duct system design static pressure.
   4. Explain the difference between design friction loss rate and the actual static pressure loss through a duct.
   5. Explain how a duct’s equivalent length is determined.
   6. Use a duct calculator to look up the duct size, air velocity and friction rate.
   7. List the criteria for selecting grilles and registers.