HCR 440 - Electrical Controls & Circuits

Credits: 5
Lecture Hours: 2
Lab Hours: 6
Practicum Hours: 0
Work Experience: 0
Course Type: Voc/Tech

The application of motor control circuits used in industrial application, in particular in the HVAC/R field. These applications include contactors, starters, starting relays, interlocks, relays, thermostats, split phase, shaded pole, capacitor start motors and three-phase motors.
Prerequisite: HCR 404
Competencies

Know and use Ohms law to solve series and parallel circuit problems
Use ammeters, voltmeters and ohmmeters to check devices, motors and loads
Know the different voltages used to supply power to Industrial and HVAC equipment
List and identify the different types of low and high (line) voltage thermostats
Name the common thermostat sub-base markings for wire connections
Describe the operation of each of the compressor motor starting relays
Wire a potential relay and capacitor circuit
List the types of fuses and circuit breakers used as protective devices
Troubleshoot compressor and motor protectors
Connect control circuits using schematic and wiring diagrams
Know the different characteristics and uses of each of the following motors: split-phase, shaded pole, capacitor, and three phase
Connect motor leads on various types of motors, for different voltages and rotation
Test motor starting capacitors and starting switches
Determine motor bearing wear conditions
Select replacement motors correctly using nameplate data
Size a three phase motor starter and pick the correct size overloads for a given motor H.P. and ampere rating, as selected by the instructor
Wire to the starter in competency #16 a Stop Start (momentary) push button station, in series with a temperature high limit control (firestat) interlock. The interlock is to not permit the motor to run until reset
Draw wiring diagrams of various HVAC equipment, selected by the instructor