residential hvac components

Question 1

heating and cooling are usually distrusted through the central system usually a furnace in a residential system ?

Answer 1

true

Question 2

combustibles should never interact with air distrusted to the occupied space ?

Answer 2

true

Question 3

hot water coil to provide heat is called?

Answer 3

)fan coil

Question 4

extended and reducing plenums are used to distribute air to supply runs ?

Answer 4

true

Question 5

)two components listed located in a furnace ?

Answer 5

Blower , mother board , heat exchanger ,filter

Question 6

)components in a fan coil

Answer 6

blower , mother board , filter

Question 7

what’s a pto ?

Answer 7

Its to assist airflow from the plenum to the duct

Question 8

what is the cross section of a pto

Answer 8

the cross section is 1.5 bigger then the area of the its being attached to

Question 9

)what is the max radio of duct

Answer 9

Width x depth should not exceed 4:1

Question 10

define reducer

Answer 10

Changes the size of the duct smoothly with low turbulence

Question 11

)list parts needed for a branch run?

Answer 11

Duct take offs ,pipping and diffusers ,transitions ,(boots)hangers

Question 12

where are volume dampers and why do we use them ?

Answer 12

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

Question 13

what is the equivalent length of pipe90 elbow ?

Answer 13

10 feet

Question 14

what is used to hold up a length of pipe in floor joist ?

Answer 14

pipe supports are used at each joint and the ends

Question 15

)why are stack ducts used ?

Answer 15

to run between walls to reach other locations They are used go from round to rectangle

Question 16

)what is the final part of a supply run

Answer 16

Diffuser

Question 17

where is fresh connected to on a hvac ?

Answer 17

Connected to the cold air return 10 feet from the furnace

Question 18

what can be used for liner for cold air

Answer 18

Thermopan , metal , drywall , plastic

Question 19

return air frame is used to ?

Answer 19

Ensure drywallers don’t cover opening and to a backing to screw to and to have a clean cut

Question 20

where is the cold air drop located

Answer 20

? It located from the main cold air duct that connects the to occupied space and the furnace

Question 21

what are slitters used for

Answer 21

They are used divide air flow evenly through the filter like vanes

Question 22

)what incases underground slab heating

Answer 22

Concrete encases the spiral ducts

Question 23

)which way dose underslab heating slope

Answer 23

Its back towards the furnace

Question 24

)what is standata in 2006 stating for high efficient furnaces

Answer 24

Pvc pipe is mandatory for venting combustion AIT high efficient appliances with special solvents cements

Question 25

what type of venting Is allowed only with high efficient furnaces

Answer 25

UlcPvc 636

Question 26

define vent connector

Answer 26

It’s portion of the combustion venting that removes the flues gases to the common vent

Question 27

what two types of connectors can be used

Answer 27

Single wall and b-vent connector

Question 28

what is required in the chimney when a new furnace is installed

Answer 28

Chimney liner needs to be installed at the time of install

Question 29

what is a common boot size in residential systems

Answer 29

4 x 10

Question 30

three methods to supply heat ducts to a basement

Answer 30

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

Question 31

What’s the purpose of a fresh air hood ?

Answer 31

To cover the hole in the envelope

Question 32

why is a termination bucket used

Answer 32

To control cold air from dropping into the basement when the appliances are not working

Question 33

To control cold air from dropping into the basement when the appliances are not

Answer 33

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