Furnaceman Technologies
COURSE   4   "Refrigeration & Electrical Control Theory for AC & Heat Pumps"
(Prerequisites: Thermodynamics for HVAC, Electrical Theory & Troubleshooting Techniques)
Course Outline:

Refrigerants
· What is a refrigerant
· Sensible and Latent heat
· Enthalpy charts for R-22 & R-410a
In Depth Study of the Refrigeration Cycle
· Where will
we find saturated liquids and vapors
· Identify the function of the compressor, condenser, evaporator, and metering device
· Where we will find superheated vapor, sub-cooled liquid, and both liquid & vapor
· The PT chart ~ what is its function, what are its limitations
· How does a refrigeration system respond to changing conditions
Mechanical Refrigeration Components In AC and Heat Pump Systems
· A close look at c
ompressors, condensers, evaporators, metering devices
· A close look at reversing valves & check valves in heat pump systems
· Practice Troubleshooting AC & Heat Pump mechanical refrigeration problems
Electrical Refrigeration Components In AC and Heat Pump Systems
· Electrical side of compressors, fan motors, and related power handling components
· Single stage and multistage AC & Heat Pump systems
· Defrost controls and reversing valve
for Heat Pump systems
· 24 volt controls for AC & Heat Pump systems
Control Strategies for AC & Heat Pumps not using electric resistance heaters
· Using gas and Oil furnaces with AC & Heat Pump systems
· Hot water coils & Hydro-Air systems
Control Strategies for Two Stage Systems
· Zone systems, problems associated with zoning
· Modulating multistage systems for capacity control
Properly Sizing Line Sets
· Pressure drops in liquid lines
· Performance factors and required gas velocities in suction lines
Measuring AC System Capacity
· Determining air velocities in duct systems
· Converting temperature drops, grains of moisture, & CFM's into BTU's