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Chapter 12

Air Delivery Systems. Chapter 12. l. Objectives. Explain how an HVAC system blower operates. Identify the major parts of an HVAC system blower and motor. Explain the operation of HVAC blower speed controls. ll. Objectives. Identify the purposes of HVAC system air ducts.

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Chapter 12

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  1. Air Delivery Systems Chapter 12

  2. l. Objectives • Explain how an HVAC system blower operates. • Identify the major parts of an HVAC system blower and motor. • Explain the operation of HVAC blower speed controls.

  3. ll. Objectives • Identify the purposes of HVAC system air ducts. • Explain the design and placement of HVAC system air ducts. • Identify the types and purposes of HVAC system air doors.

  4. lll. Objectives • Explain how HVAC system air doors are operated. • Identify and explain HVAC system air door operating devices.

  5. Air Handling Systems

  6. Air Handling System Functions • Generates airflow • Ensures air is heated or cooled as necessary • Delivers air to proper place in passenger compartment

  7. Note • Some of the most common problems affecting the HVAC system are caused by defects in the blower, ductwork, and air doors.

  8. Air Handling System Components • Blower wheels • Blower motors

  9. Upstream / Downstream • Refers to position of a component in air delivery system as compared to any other component • Upstream receives incoming air before another component • Downstream receives incoming air after another component

  10. Rear Heating / Cooling • Rear heating / cooling systems may have a second blower and motor located at rear of passenger compartment

  11. Blower Wheel • The blower fan consists of a blower wheel (squirrel cage blower)

  12. Blower Wheel • Centrifugal air pump • Blades are shaped so rotating wheel pulls air into its center and drives it outward

  13. Blower Wheel Illustration Power lead Blower wheel Ground lead Motor

  14. Blower Motor • Connected to the electrical system through ignition switch and HVAC controls • Some have a shaft at each end, and turn two blower wheels

  15. Blower Motor Illustration

  16. Blower Motor (Cont.) • Usually vented to cool windings • Must turn in proper direction • Fan blades must be pointed in proper direction

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