ELECTRICAL TROUBLESHOOTING AC&R

• Transformers

• Circuit protection

• Motor basics for single and three phase systems

• Capacitors, starters, thermostats

• Motor controls

 

TEMPERATURE AND PRESSURE

• Measuring temperature and pressure

• The Gas Laws

 

BASIC REFRIGERATION CYCLE

• Refrigeration systems and components

• Evaporating and Condensing units

• Suction accumulator

• Filter driers

 

REFRIGERANTS

• Halide refrigerants

• Refrigerant numbering system

• Refrigerant cylinder codes

• Selecting a refrigerant

 

REFRIGERANT RECOVER AND RECYCLING

• The Clean Air Act

• Refrigerant leaks

• The three “Rs” – Recover, Recycle, Reclaim

• Record keeping

• Certification requirements

• Recovery procedures

• Recycle equipment

 

ZEOTOPIC BLENDS

• Pure refrigerants, mixtures and blends

• Temperature-pressure card

• Retrofit procedures

 

TROUBLESHOOTING REFRIGERANT PROBLEMS

• Moisture, air and contaminants

• Leak detection

 

WORKING WITH CONTROLS AND VALVES

• Check valves, solenoid valves, EPR valve

• Controlling head pressure

 

FLOW CONTROLS

• AEV, EPR, and TEV

• Capillary tube system

• Hot gas and other by-pass valves

 

COMPRESSORS

• Types of compressors

• Adding refrigerant oils to compressors

• Oil separators

• Determining compressor efficiency

 

SMART DECISION MAKING

• Making a replacement vs repair decision

• Should you do the work or send it out?

• Life expectancy of critical parts

• Locating items for obsolete” equipment

 

HANDS-ON EXERCISES

• Installing and removing a manifold gauge set

• Measuring superheat and subcooling

• Recovering the refrigerant from a system

• Evacuating (pulling a vacuum)

• Charging a system by weight and by superheat

• Performing a “pump-down”

• Working with service valves and Schraeder cores

• Troubleshooting