Title: Unit 7 Outline
Course: HET 273 - Pneumatic, Electric and DDC Automation - Spring 2015 > Section: HET 273 - Pneumatic, Electric and DDC Automation - Spring 2015

Unit 7 Outline

Unit 7 Outline
Unit 7 Outline

Objectives

This week’s assignments will support the HVAC Learner to:

- Understand pneumatic thermostats
- Calibrate thermostats
- Understand humidistats
- Understand pressure switches

Introduction

In the HVAC/R industry there are various types of equipment used to heat, cool, humidify, and maintain proper air circulation and pressurize buildings. In order to maintain comfort for occupants or proper conditions for products, we must use thermostats, humidistats. Or pressure controls. The HVAC/R technician must understand these controls to properly service, calibrate, and troubleshoot systems.

Vocabulary

- Bimetallic Element
- Restrictor
- Bleed Port
- Direct Acting
- Reverse Acting
- Dead Band

This Week’s Objectives

1. Thermostats
  1. Types
  2. Operation
  3. Calibration
  4. Troubleshoot
  5. Humidistats
    1. Types
    2. Operation
    3. Calibration
    4. Troubleshoot
    5. Pressure Switches
      1. Types
      2. Operation
      3. Calibration
      4. Troubleshoot

Summary

- The technician must have a good knowledge of pneumatic thermostat operation
- The technician must be able to calibrate thermostats
- An understanding of duct and of building pressurizations important in diagnosing system problems
- A knowledge of humidity control is needed to maintain building comfort