Title: Unit 4 Outline
Course: HET 119 HVACR Electricity II > Section: HET 119 HVACR Electricity II

Unit 4 Outline

page 1
Unit 4 Outline

1.     Type of Loads
1. Motors
2. Coils
3. Lights
4. Heaters

2.     Type of Switches
1. Contactors
2. Relays
3. Thermostats
4. Humidistats
5. Disconnects
6. Motor Starters
7. Limit Controls

3.     Operation of Switches
1. Make
2. Brake
3. Normally Open
4. Normally Closed
5. Timed Delay

4.     Summary
Symbols are used to simplify an electrical diagram and to help the technician to quickly troubleshoot electrical systems.
Symbols help in locating components in system and to give a sequence of operation of the equipment.
All electrical components will have a symbols and it can show the position of its operation and allow for ease of wiring.
Review the vocabulary terms listed below and look up their definitions / descriptions before taking the Vocabulary Quiz.

Vocabulary

Contactor

Relay

Fuse

Heater

Motor

Normally Open

Normally Closed

Pressure Switch

Solenoid

Thermal Overload

Thermostat

Transformer