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Dec 13, 2024
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HVAC 210W - Commercial Air ConditioningCredits: 3 Instructional Contact Hours: 3
Develops an understanding of AC electrical fundamentals concerning the operation, installation, and analysis of HVACR components and control circuits used in commercial air conditioning systems. Examines single- and poly-phase transformers and motors, heating and air conditioning controls, commercial timers, motor starters, contactors, relays, and other control devices. Focuses on rooftop units, split system air-conditioning units, and self-contained air-conditioning units. Includes hands-on training on wiring diagrams, wiring projects, and sealed systems. Credit may be earned in either HVAC 210W or RHA 210W but not in both.
Prerequisite(s): HVAC 146 Corequisite(s): None Lecture Hours: 35 Lab Hours: 10 Meets MTA Requirement: None Pass/NoCredit: Yes
Outcomes and Objectives - Demonstrate knowledge of electrical motors and compressors used in single- and three-phase equipment.
- Identify electrical characteristics of single-phase motors and compressors.
- Identify electrical characteristics of single-phase Permanent Split Capacitor motors (PSC motors).
- Explain how a current relay works on single-phase split-phase motors and compressors.
- Explain how a voltage relay works on single-phase split-phase motors and compressors.
- Identify how a three-phase motor works.
- Define the term poly-phase in relation to three-phase motors and compressors.
- Identify overload requirements of a single-phase motor.
- Identify overload requirements of a three-phase motor.
- Identify and trace how a single-phase multi-speed motor is wire wound.
- Identify and trace how a three-phase multi-speed motor is wire wound.
- Identify and trace how a single-phase motor can be made reversible.
- Explain and trace how a three-phase motor can be made reversible.
- Explain Delta wound motors.
- Explain Wye wound motors.
- Demonstrate knowledge of electric controls and control circuits.
- Trace low voltage circuits on a wire diagram.
- Trace three-phase line duty circuits on a wire diagram.
- Identify low voltage controls.
- Identify line duty voltage controls.
- Identify low voltage safety circuits.
- Identify three-phase compressor safety circuits.
- Demonstrate knowledge of airflow designs.
- Identify how air shutters work
- Identify how damper controls work.
- Identify temperature designs for medium and high temperature air conditioning systems.
- Explain the Psychometrics of air conditioning.
- Use wet bulb temperature and dry bulb temperature on a Psychometric chart to find:
- Dew point
- Total heat content of 1 lb. of air
- Moisture content of the air
- Relative humidity
- Specific volume of air
- Perform an air balance.
- Identify duct system pressures.
- Static pressures
- Velocity
- True velocity pressure
- Total air pressure
- Pitot tube pressures
- Identify design conditions for high-efficiency equipment.
- Identify design conditions for standard efficiency units.
- Find equipment efficiency ratings. (EER-SEER)
- Demonstrate knowledge of pressure and flow controls.
- Identify how head pressure control works.
- Identify how heat exchangers work.
- Explain how heat reclaim works.
- Define and measure superheat.
- Explain sub cooling.
- Explain condenser flooding.
- Explain floating head pressures.
- Identify these types of compressors and their operation:
- Reciprocating
- Screw
- Rotary
- Scroll
- Centrifugal
- Calculate compression ratio.
- Calculate absolute pressures.
- Identify expansion valve types.
- Explain how an expansion valve works.
- Identify the four basic components of the compression refrigeration cycle.
- Compressor
- Condenser
- Expansion devise
- Evaporator
- Define how an Evaporator Pressure Regulator works (EPR valve).
- Explain the operation of a direct-acting evaporator pressure EPR valve.
- Explain how multiple evaporators work.
- Explain how a crankcase pressure regulator works.
- Explain how a relief valve works.
- Explain the four methods of heat control.
- Fan cycling using a pressure control
- Fan speed control
- Air volume control using shutters and fan cycling.
- Condenser flooding devices.
- Explain low ambient head pressure controls.
- Explain how liquid line solenoids work.
- Explain how pressure switches work.
- Low-pressure switch-closes on a rise in pressure
- High-pressure switch-opens on a rise in pressure.
- Low ambient control-closes on a rise in pressure
- Oil safety switch (has time delay)-opens on a rise in pressure
- Explain how refrigerant check valves work.
- Explain how a site glass works.
- Explain how a multi-circuit distributor works.
- Explain how drier filters work.
- Liquid line drier
- Suction line drier
- Explain how an accumulator works.
- Explain how refrigerant hand valves work.
- Discharge service valves
- Refrigeration line service valves
- Diaphragm valves
- Ball valves
- Explain how oil separators work.
- Explain how vibration eliminators work.
- Explain the values of crankcase heat.
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