Title: Unit 8 Outline
Course: HET 119 HVACR Electricity II > Section: HET 119 HVACR Electricity II

Unit 8 Outline

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Unit 8 Outline

1. Relays and contactors
  - Parts of a Relay and Contactor
  - Making and Breaking of Contacts
  - Type of Switching Actions
2. Motor RelaysWiring diagrams for Motors
  - Current Relay
  - Potential Relay
3. Motor Protection
  - Fuses and Breakers
  - Thermo-overloads
  - Current Overloads
  - Service Disconnects

Summary

- Motor are used to do work; however, all motors need some way to operate it correctly and safely.
- Split phase motors need a control to disengage the start winding.
- There are different types of starting components for motor and the size of the motor will determine.
- which type of control will be used.
- All motors need some type of motor protection to keep it safe from dangerous conditions.
- Service disconnects are used to disengage the power to a motor while a technician is working on the motor.
- Larger motors require motor starters which is a combination of motor protection and starting device.

Review the vocabulary terms listed below and look up their definitions / descriptions before taking the Vocabulary Quiz.

Vocabulary

Potential Relay

Current Relay

Capacitor

Overload

Current Overload

Thermo-overload

Contactor

Relay

Motor Protection Devices