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Week 1: Refrigeration Cycle
Basic compression
refrigeration cycle. System operational testing. Latent and Sensible Heat, Heat transfer,
Basic gas laws, Boiling point temperature and pressure relationships. Manifolds and
calibration. Tool check in. Ohms law and electrical introduction. Brazing, tubing
operations.
Week 2 & 3: Compressors
Compressor design, sizing,
types, application, disassembly. Identification of major components, study of the major
causes of compressor failures, capacity sizing of compressors, volumetric efficiency,
compression ratio, power requirements Introduction to electrical motors.
Weeks 4 & 5: Electrical Systems
Wiring of
electrical systems, using line and low voltage controls, Low voltage thermostats, control
of indoor blower motors, split systems, ac units, back up strip heat, sequencers.
Week 6: Condensers and Evaporators
Condenser sizing,
condenser air flow and design requirements, fan cycling, water cooled condenser, water
regulating valve functions and head pressure setting, location of remote condensers,
cooling tower, applications and basic design, low ambient head pressure control.
Evaporators design, function and application, circuiting, direct
expansion coils, sizing vs DT and %RH, air flow, EPR evaporator pressure regulators,
multiple evaporators and control, evaporator distributors, defrost; electric, hot gas, air
defrost
Week 7: Metering Devices and Mechanical Assembly of
Trainer Capillary Tubes
Sizing, application, installation, TEV and AEV - sizing,
selection, types, operation, tear down and assembly, super heat adjustment, troubleshooting
pressure testing, leak detection, evacuation, charging leak detection triple
evacuation methods, proper charging super heat, subcooling, measurements. Assembly of
small commercial trainers to current mechanical code.
Weeks 8-11: Electrical Wiring of Commercial
Trainer and Optimization of Unit
Wire trainer 15 acceptable methods. Optimize operation
of unit. Super heat/sub cooling measurements. Troubleshooting methods. Refrigerant
recovery. Review of fundamentals for EPA test certification. Review of basic
principles of refrigerant piping. Clean up lab.
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