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Dec 13, 2024
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SKPT 225 - Commercial Refrigeration IICredits: 3 Develops additional skills and understanding in the servicing of commercial units such as walk-in coolers, reach-ins, display cases, and commercial icemakers. Focuses on electrical systems and diagrams. Analyzes single-phase systems and three-phase systems. Credit may be earned in one of the following: HVAC 225 , RHA 225 or SKPT 225.
Prerequisite(s): SKPT 123 Corequisite(s): None Lecture Hours: 35 Lab Hours: 10 Meets MTA Requirement: None Pass/NoCredit: Yes
Outcomes and Objectives
- Demonstrate knowledge of electrical symbols and basic electrical diagrams.
- Identify electrical symbols used in commercial refrigeration.
- Trace circuits in basic refrigeration and air conditioning diagrams.
- Identify voltages, current, and resistance in basic refrigeration circuits.
- Use an Ohmmeter to measure resistance at switches and component loads.
- Use a voltmeter to measure voltages at switches and component loads.
- Identify basic switches in open and closed positions.
- Demonstrate knowledge of types of single-phase compressor motor circuits.
- Identify motor winding characteristics, types, and winding speeds.
- Measure motor winding resistances using engineering standard methods and the Ohmmeter.
- Trace motor winding circuits in a split phase compressor motor.
- Trace motor winding circuits in a PSC (Permanent Split Capacitor) compressor motor.
- Trace motor winding circuits in a capacitor start motor.
- Trace motor winding circuits in a capacitor, start capacitor, run circuit.
- Trace motor winding circuits in a multi-speed motor.
- Trace motor winding circuits in a reversible motor.
- Identify sine wave characteristics of 110 VAC compressor motors for current and voltage.
- Identify sine wave characteristics of 240 VAC compressor motors for current and voltage.
- Trace motor winding circuits for a 240 VAC motor.
- Identify RLA and LRA motor requirements.
- Identify motor temperature ranges, working conditions, and insulation types.
- Demonstrate knowledge of types of three-phase compressor motor circuits.
- Trace the motor winding circuits of a three-phase Delta wound compressor motor.
- Trace the motor winding circuits of a three-phase Wye wound compressor motor.
- Identify methods of reversing motor direction on a three-phase motor.
- Identify sine wave characteristics for current and voltage in three-phase circuits.
- Identify how three-phase compressor motors are made into variable speed motors.
- Identify compressor safety and protection circuits.
- Identify compressor control circuits for three-phase compressors.
- Demonstrate knowledge of sine wave characteristics.
- Identify conditions of amplitude, time, wavelength, and peak values.
- Identify frequency, phase, positive, and negative in response to the sine wave.
- Identify average values, true values, and peak value.
- Identify sine wave forms for AC electricity and DC electricity.
- Identify the characteristics of voltage and current in relation to the sine wave.
- Identify how current sine wave and voltage sine wave respond to maximum power factor.
- Identify how the current sine wave and the voltage sine wave respond in single-phase 110 VAC current applications.
- Identify how the current sine wave and voltage sine wave respond in single-phase 240 VAC current applications
- Identify how the current sine wave and the voltage sine wave respond in three-phase applications.
- Identify how the current since wave and the vo0ltage sine wave respond to capacitive reactance.
- Identify how the current sine wave and the voltage sine wave respond to inductive reactance.
- Demonstrate knowledge of capacitors, relays, and starters.
- Identify the parts of capacitor and its operation
- Identify types of capacitors
- Identify voltage characteristics and micro farad capacities of a capacitor.
- Identify methods of testing a capacitor.
- Identify how a current relay works.
- Identify how a voltage relay works.
- Additional supplies cost of $20 per student Identify how a thermal relay works.
- Identify how a single-phase motor starter works.
- Identify how a single-phase motor starter works
- Identify how a three-phase starter works.
- Identify how a contactor works.
- Use an ohmmeter to test these starters and relays.
- Current relay
- Voltage relay
- Thermal relay
- Hot wire relay
- Single-phase starter
- Three-phase starter
- Contactor
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