HVAC Heating Theory Chapter 38
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Questions and Answers

The two types of combustion blowers are ________ blowers.

  • Downdraft and updraft
  • Forced draft and induced draft (correct)
  • Primary and auxiliary
  • Pre-combustion and post-combustion
  • The heat source of a forced-air heating system may consist of ____.

  • Electric resistance heating elements
  • The indoor coil of a heat pump
  • A gas-fired furnace
  • Any of the above (correct)
  • What type of furnaces are high efficiency with AFUE ratings above 90%?

  • Combustion
  • Noncondensing
  • Condensing (correct)
  • Noncombustion
  • Secondary heat exchangers ____.

    <p>Transfer sensible and latent heat</p> Signup and view all the answers

    A furnace's ____ blower creates airflow through the heat exchanger and ductwork to deliver warm air to the conditioned area.

    <p>Indoor</p> Signup and view all the answers

    In direct-drive blowers, the ____ of the blower motor is connected to the blower fan.

    <p>Shaft</p> Signup and view all the answers

    A furnace that can be reconfigured to allow airflow through in any direction is a ____ furnace.

    <p>Multipoise</p> Signup and view all the answers

    In what type of system is the supply air delivered out of the top of the furnace into an overhead duct system?

    <p>Upflow</p> Signup and view all the answers

    Which type of furnace takes in return air from the top and forces it out near the bottom?

    <p>Downflow</p> Signup and view all the answers

    A furnace that can vary its heat output along a scale that may range from 40% to 100% capacity is a(n) ____ furnace.

    <p>Modulating</p> Signup and view all the answers

    A forced-air heating system uses a system of ____ air ducts to deliver warm air to the conditioned spaces.

    <p>Supply</p> Signup and view all the answers

    A forced-air heating system uses a system of ____ air ducts to bring air back to the furnace for reheating.

    <p>Return</p> Signup and view all the answers

    Study Notes

    Combustion Blowers

    • Two types: Forced draft and induced draft.

    Forced-Air Heating Systems

    • Heat sources can include electric resistance heating elements, indoor coils of heat pumps, and gas-fired furnaces.

    High Efficiency Furnaces

    • Condensing furnaces are high efficiency with AFUE ratings above 90%.

    Secondary Heat Exchangers

    • Designed to transfer both sensible and latent heat.

    Indoor Blower Function

    • The indoor blower creates airflow through the heat exchanger and distributes warm air through ductwork.

    Direct-Drive Blowers

    • In direct-drive systems, the motor's shaft connects directly to the blower fan.

    Multipoise Furnaces

    • These furnaces can be reconfigured to allow airflow in any direction.

    Duct System Configurations

    • Upflow systems deliver supply air from the top of the furnace into overhead ducts.
    • Downflow systems draw return air from the top and push it out near the bottom.

    Modulating Furnaces

    • Capable of varying heat output from 40% to 100% capacity.

    Duct Types in Forced-Air Systems

    • Supply ducts are responsible for delivering warm air to conditioned spaces.
    • Return ducts bring air back to the furnace for reheating.

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    Description

    Test your knowledge on HVAC heating theory with this quiz focused on Chapter 38. Discover the various concepts related to combustion blowers and forced-air heating systems. Perfect for students and professionals looking to reinforce their understanding in this field.

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