Questions and Answers
The two types of combustion blowers are ________ blowers.
The heat source of a forced-air heating system may consist of ____.
What type of furnaces are high efficiency with AFUE ratings above 90%?
Secondary heat exchangers ____.
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A furnace's ____ blower creates airflow through the heat exchanger and ductwork to deliver warm air to the conditioned area.
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In direct-drive blowers, the ____ of the blower motor is connected to the blower fan.
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A furnace that can be reconfigured to allow airflow through in any direction is a ____ furnace.
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In what type of system is the supply air delivered out of the top of the furnace into an overhead duct system?
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Which type of furnace takes in return air from the top and forces it out near the bottom?
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A furnace that can vary its heat output along a scale that may range from 40% to 100% capacity is a(n) ____ furnace.
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A forced-air heating system uses a system of ____ air ducts to deliver warm air to the conditioned spaces.
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A forced-air heating system uses a system of ____ air ducts to bring air back to the furnace for reheating.
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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.
