residential hvac components Flashcards
heating and cooling are usually distrusted through the central system usually a furnace in a residential system ?
true
combustibles should never interact with air distrusted to the occupied space ?
true
hot water coil to provide heat is called?
)fan coil
extended and reducing plenums are used to distribute air to supply runs ?
true
)two components listed located in a furnace ?
Blower , mother board , heat exchanger ,filter
)components in a fan coil
blower , mother board , filter
what’s a pto ?
Its to assist airflow from the plenum to the duct
what is the cross section of a pto
the cross section is 1.5 bigger then the area of the its being attached to
)what is the max radio of duct
Width x depth should not exceed 4:1
define reducer
Changes the size of the duct smoothly with low turbulence
)list parts needed for a branch run?
Duct take offs ,pipping and diffusers ,transitions ,(boots)hangers
where are volume dampers and why do we use them ?
they are located by the brunch run or by the diffusers , we use the to isolate the air and move that air to another location
what is the equivalent length of pipe90 elbow ?
10 feet
what is used to hold up a length of pipe in floor joist ?
pipe supports are used at each joint and the ends
)why are stack ducts used ?
to run between walls to reach other locations They are used go from round to rectangle
)what is the final part of a supply run
Diffuser
where is fresh connected to on a hvac ?
Connected to the cold air return 10 feet from the furnace
what can be used for liner for cold air
Thermopan , metal , drywall , plastic
return air frame is used to ?
Ensure drywallers don’t cover opening and to a backing to screw to and to have a clean cut
where is the cold air drop located
? It located from the main cold air duct that connects the to occupied space and the furnace
what are slitters used for
They are used divide air flow evenly through the filter like vanes
)what incases underground slab heating
Concrete encases the spiral ducts
)which way dose underslab heating slope
Its back towards the furnace
)what is standata in 2006 stating for high efficient furnaces
Pvc pipe is mandatory for venting combustion AIT high efficient appliances with special solvents cements
what type of venting Is allowed only with high efficient furnaces
UlcPvc 636
define vent connector
It’s portion of the combustion venting that removes the flues gases to the common vent
what two types of connectors can be used
Single wall and b-vent connector
what is required in the chimney when a new furnace is installed
Chimney liner needs to be installed at the time of install
what is a common boot size in residential systems
4 x 10
three methods to supply heat ducts to a basement
First one is to use boots in the ceiling with wings on it to screw it to the joist and have backing to support it ,another way would be to use a round diffuser that would require a 90 elbow facing down to the floor , another way is to run the branch run to the end of the wall and connect a round to rectangle boot
use a stack duct
What’s the purpose of a fresh air hood ?
To cover the hole in the envelope
why is a termination bucket used
To control cold air from dropping into the basement when the appliances are not working
To control cold air from dropping into the basement when the appliances are not
B-vent : is to remove combustibles from natural gas and propane with a air gap
L-vent: is used to vent higher temperature applications similar to b vent with a separated air gap
A-vent: is to vent solid fuel appliances with a 1 inch insulated fire wall
