Podcast
Questions and Answers
The two types of combustion blowers are ________ blowers.
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 ____.
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%?
What type of furnaces are high efficiency with AFUE ratings above 90%?
- Combustion
- Noncondensing
- Condensing (correct)
- Noncombustion
Secondary heat exchangers ____.
Secondary heat exchangers ____.
A furnace's ____ blower creates airflow through the heat exchanger and ductwork to deliver warm air to the conditioned area.
A furnace's ____ blower creates airflow through the heat exchanger and ductwork to deliver warm air to the conditioned area.
In direct-drive blowers, the ____ of the blower motor is connected to the blower fan.
In direct-drive blowers, the ____ of the blower motor is connected to the blower fan.
A furnace that can be reconfigured to allow airflow through in any direction is a ____ furnace.
A furnace that can be reconfigured to allow airflow through in any direction is a ____ furnace.
In what type of system is the supply air delivered out of the top of the furnace into an overhead duct system?
In what type of system is the supply air delivered out of the top of the furnace into an overhead duct system?
Which type of furnace takes in return air from the top and forces it out near the bottom?
Which type of furnace takes in return air from the top and forces it out near the bottom?
A furnace that can vary its heat output along a scale that may range from 40% to 100% capacity is a(n) ____ furnace.
A furnace that can vary its heat output along a scale that may range from 40% to 100% capacity is a(n) ____ furnace.
A forced-air heating system uses a system of ____ air ducts to deliver warm air to the conditioned spaces.
A forced-air heating system uses a system of ____ air ducts to deliver warm air to the conditioned spaces.
A forced-air heating system uses a system of ____ air ducts to bring air back to the furnace for reheating.
A forced-air heating system uses a system of ____ air ducts to bring air back to the furnace for reheating.
Flashcards
Combustion blower types
Combustion blower types
Forced draft and induced draft blowers ensure proper combustion by supplying air and removing exhaust gases.
Heat source options
Heat source options
A forced-air heating system can use various heat sources, including gas, oil, or electricity.
Condensing furnaces
Condensing furnaces
Condensing furnaces are high-efficiency furnaces with AFUE ratings above 90%, extracting more heat from the fuel.
Secondary heat exchangers
Secondary heat exchangers
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Indoor blower function
Indoor blower function
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Direct-drive blowers
Direct-drive blowers
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Multipoise furnace
Multipoise furnace
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Upflow system
Upflow system
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Downflow furnace
Downflow furnace
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Modulating furnace
Modulating furnace
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Supply air ducts
Supply air ducts
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Return air ducts
Return air ducts
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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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