HVAC Unit 31 Gas Heat EXAM STUDY GUIDE 2026
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Terms in this set (115)
Name the four main components of Manifold and controls
a gas fired heating system. Burners
Heat exchanger
Venting system
Name the four types of furnace flow Upflow
patterns. Low-boy
Downflow
Horizontal
Which type of furnace is usually Low-boy
found in basements that have low
headroom?
What is another name for a Counterflow
downflow furnace?
Where do you usually find horizontal In crawl spaces, attics and suspended from floor
furnaces? joists in basements.
, What is so special about multipoise They can be installed in any position. They are very
furnaces? versatile and give installers the option of upflow,
downflow, horizontal right or horizontal left
discharge.
Why do multipoise furnaces have Because these furnaces can be placed in four
extra safety controls? different configurations, they must multiple safety
controls designed into the furnace.
Where are flame rollout switches They are installed near the top of the burner box,
usually installed? where the flame is most likely to roll out.
How do auxiliary limit switches work? They are used for counterflow and horizontal
furnaces. They are usually bimetallic and are
mounted on the warm air blower housing to they
can monitor room return air temperature and
interrupt the burners when the temperature gets
too hot.
Are vent limit / draft safeguard They are NC switches and monitor the draft hood
switches NC or NO and what do they temperature and open when there is any spillage
do? of flue gas.
What are the three commonly used Natural gas
gas fuels? Manufactured gas
Liquified petroleum or LP gas
What is the specific gravity of natural The specific gravity is .60 and it is lighter than air so
gas and is it lighter than air? it rises.
How many Btu of heat energy do 1050 Btu of heat energy.
you get from 1 cubic foot of natural
gas?
COMPLETE QUESTIONS WITH CORRECT
DETAILED ANSWERS || 100% GUARANTEED PASS
LATEST VERSION
Save
Terms in this set (115)
Name the four main components of Manifold and controls
a gas fired heating system. Burners
Heat exchanger
Venting system
Name the four types of furnace flow Upflow
patterns. Low-boy
Downflow
Horizontal
Which type of furnace is usually Low-boy
found in basements that have low
headroom?
What is another name for a Counterflow
downflow furnace?
Where do you usually find horizontal In crawl spaces, attics and suspended from floor
furnaces? joists in basements.
, What is so special about multipoise They can be installed in any position. They are very
furnaces? versatile and give installers the option of upflow,
downflow, horizontal right or horizontal left
discharge.
Why do multipoise furnaces have Because these furnaces can be placed in four
extra safety controls? different configurations, they must multiple safety
controls designed into the furnace.
Where are flame rollout switches They are installed near the top of the burner box,
usually installed? where the flame is most likely to roll out.
How do auxiliary limit switches work? They are used for counterflow and horizontal
furnaces. They are usually bimetallic and are
mounted on the warm air blower housing to they
can monitor room return air temperature and
interrupt the burners when the temperature gets
too hot.
Are vent limit / draft safeguard They are NC switches and monitor the draft hood
switches NC or NO and what do they temperature and open when there is any spillage
do? of flue gas.
What are the three commonly used Natural gas
gas fuels? Manufactured gas
Liquified petroleum or LP gas
What is the specific gravity of natural The specific gravity is .60 and it is lighter than air so
gas and is it lighter than air? it rises.
How many Btu of heat energy do 1050 Btu of heat energy.
you get from 1 cubic foot of natural
gas?
