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Year 2, First Semester | |
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Review of Refrigeration Cycle | |
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Basic refrigeration cycle | |
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Saturation, superheat and subcooling | |
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Compressors | |
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Metering devices | |
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evaporators | |
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Compressors | |
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Reciprocating | |
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Scroll 2 stage | |
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Hermetic and semi-hermitic | |
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Rotary types, how they work, applications | |
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Refrigerants and Lubricants | |
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Applications and required lubricants | |
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CFCs, HCFCs, chemical strength | |
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Safety and handling | |
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EPA certification | |
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Recovery and recycle | |
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Refrigerant Handling Certification | |
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Condensers | |
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Air cooled | |
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Water cooled | |
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Evaporative | |
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Metering Devices | |
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Capillary tubes | |
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Fixed orifice/plate | |
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Thermostatic expansion valves (TXV) | |
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Electronic expansion valves (EXV) | |
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Accessories | |
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Receivers | |
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Accumulators | |
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Service valves/access ports | |
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Suction/liquid line heat exchangers | |
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Low ambient controls | |
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Reversing valves (defrost, heat pump) | |
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Relief valves | |
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High/low pressure control | |
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Vibration eliminators | |
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Crankcase heater | |
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Evaporators | |
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Types (plate, fin) and applications | |
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Latent and sensible heat removal | |
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Superheat | |
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Direct expansion and flooded | |
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Pressure drop | |
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Moisture removal | |
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Defrost applications | |
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Evacuation and Charging | |
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Leak testing methods | |
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Troubleshooting | |
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Recovery | |
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Vacuum pumps | |
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Dehydration | |
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Safety | |
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Heating | |
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Types of heating appliances | |
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Components, burners and valves | |
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Boilers: water and stream | |
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Sequence of operation | |
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Pumps | |
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Venting | |
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Gas pipe capacity | |
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Ignition devices | |
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Combustion process and testing | |
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Code and safety | |
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Carbon monoxide | |
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Electric and strip | |
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Radiant | |
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Venting | |
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Combustion and secondary air | |
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Gas manifolds | |
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Temperature controls | |
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Safety and Limit controls | |
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Sequence of operation | |
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Electrical | |
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Ohms law review and application | |
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Transformers, voltage, line vs load | |
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Types of wire and wire sizes | |
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Circuits and schematics | |
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Relays | |
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Capacitors | |
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XFMR | |
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Logic | |
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Sources: single and 3 phase | |
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Switches and loads | |
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Contactors | |
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Troubleshooting/testing | |
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Starters | |
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Overload protectors/overcurrent protection (fuses & circuit breakers) | |
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Overcurrent/fuses | |
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Grounding | |
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Breakers | |
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OCPDs | |
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Bonding | |
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Sizing | |
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Disconnects and wire sizing | |
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Electrical Troubleshooting | |
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Symptoms, possible causes and application to instrumentation | |
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Circuits, complete, short, open and grounded | |
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Troubleshooting | |
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Effects of loose wire connections | |
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Wiring diagrams used for troubleshooting | |
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Use of meter/with electrical schematics | |
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Shorts, open, grounds | |
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Loose neutrals | |
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Introduction to Motors | |
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Types of motors: squirrel cage, induction, single phase, dual phase, three phase and variable speed | |
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Magnetism | |
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Induced current | |
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Electromagnetism | |
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Motor torque | |
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Starting relays | |
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Starting switch | |
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Starting, relays | |
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Efficiency | |
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Heat and temperature | |
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Dimensions | |
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Identifying motor start and run windings | |
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Mechanical and installation considerations | |
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Shafts | |
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Lubrication and bearings | |
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Noisy operation | |
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Electrical connections | |
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Operating limitations | |
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Motor overload protections | |
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Nameplate data | |
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Year Two, Second Semester | |
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Cooling Equipment | |
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Types of units: RTU, split, package, unitary, built-up, matched, ductless, chillers (air and water cooled), cooling tower, chilled water, CW, water treatment intro, pumping | |
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Fluids | |
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Closed vs open loop | |
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Basic sizing | |
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CFM/ton | |
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Sensible vs. latent heat | |
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Velocity over face of coil | |
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Economizers | |
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Outside air | |
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Duct sizing - supply vs. return | |
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Duct calculator | |
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Mechanical Troubleshooting | |
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Troubleshooting: refrigeration, A/C, furnace and air flow problems | |
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Case studies of components/systems | |
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Symptoms/problems/causes; refrigeration, cooling, heating, CSI | |
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Advanced Installation Techniques | |
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Best practices | |
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Piping: Dielectric unions and support | |
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Duct sealing systems | |
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Common code violations and solutions | |
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Vibration and noise issues | |
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Control Systems | |
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Types of thermostats | |
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Built-in thermostat functions | |
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Heating/cooling controls | |
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Sequence of operation | |
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Troubleshooting components | |
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Pressure switches | |
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Loss of charge | |
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Psychrometrics | |
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Why learn psychrometrics? | |
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Psychrometric chart terminology | |
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Human comfort zone | |
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Gas laws | |
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Sling psychrometer | |
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What do the lines on the psychrometric chart mean? | |
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Using the psychrometric chart | |
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Finding the properties of air | |
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IAQ: mold and moisture issues | |
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Moisture control: humidification and dehumidification, system, room or whole house moisture control | |
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Basic Sizing | |
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Heat transfer theory | |
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Steps in sizing equipment | |
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Importance of heating and cooling load calculations | |
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Relationships between load, equipment and duct | |
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Location of ducts/proper installation/sealing | |
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Why match condensers, evaporators and blowers? | |