Create an account
What is a water and digital manometer?
A water or digital manometer is an instrument that measures gas pressures.
The pressure at the manifold for natural gas is?
The pressure at the manifold for natural gas is normally 3.5" WC (water column).
Why is excessive air supplied to all gas burning appliances?
Excessive air is supplied to all gas burning appliances to support combustion.
The purpose of a gas regulator at a gas burning appliance is to?
The purpose of a gas regulator at a gas burning appliance is to drop the pressure to the proper level (in. WC) and maintain this constant pressure at the outlet where the gas is fed to the gas valve.
What is a redundant gas valve?
A redundant gas valve has two or three valve operators physically in series but wired in parallel with one another. This built in safety feature allows any operator (pilot or main) to block gas from getting to the main burner.
What is a intermittent pilot gas valve system?
An intermittent pilot gas valve system lights the pilot every time there is a call for heat by the thermostat. When the call for heat ends the pilot is extinguished and does not relight until the next call for heat.
What is a direct burner gas valve system?
In a direct burner gas valve system the electronic module or IFC lights the main burner directly without a pilot flame. A spark, hot surface igniter or a glow coil ussually accomplishes ignition.
Where are inshot burners used in heating applications?
Inshot burners simply slip over the orifice spuds and are screwed in place.
What is an integrated furnace controller (IFC)?
An integrated furnace controller controls the ignition and sequence of operation of most modern gas furnaces.
If there is too much primary air, the gas
flame can ____.
a. get blown out
b. "lift" off the burner rack
c. make noise
d. both b and c
Answer : D
A furnace with a vertical air flow through the
heat exchanger and the blower compartment beneath the heat exchanger is called a(n) ____.
c. low boy
Answer : B
The proper color of a gas flame is ____.
a. sharp all blue
b. lazy all blue
c. blue with slight orange tips
d. lazy with yellow tips
Primary air adjusters on atmospheric type
gas burners are usually ____.
a. butterfly shutters
b. sliding sleeves
c. spoiler screws
d. all of the above
The orifice is a precisely sized hole in the
c. burner tube
d. combustion chamber
Answer : B
. In a conventional gas furnace, the hot flue
gases are ____.
a. forced out a PVC vent with a blower
b. recycled through a secondary heat exchanger and
then vented through a draft diverter
c. forced through a type B vent by a blower
d. vented by natural convection
A condensing gas furnace uses ____ from a
condensing type heat exchanger to increase the furnace efficiency.
a. sensible heat
b. latent heat
Answer : B
Liquified petroleum (LP) is heavier than air
and can cause suffocation if not handled properly
Answer : True
A gas furnace designed for use with natural
gas can be used with liquified petroleum (LP) with no system modifications.
Answer : False
. In the USA, natural gas suppliers supply gas
with a heat content of about 1,050 Btu/cu. ft.
Answer : True
The gas flame will lift off the burner and be
noisy if it receives too much primary air
Answer : True
Butterfly shutters and sliding sleeves are
examples of ___________ and are used on atmospheric type gas burners.
Answer : Primary AirAdjusters
. Three products of complete combustion of
natural and LP gas are ____,____,______
Answer : FUEL, OXYGEN,& HEAT___.
A furnace with a horizontal heat exchanger
and a propeller fan for moving air through the heat exchanger is called a ____________________.
Answer : Air Handler
Spark ignition is important for roof top or
package units located outdoors because of ______________
Answer : WINDY DAYS,NUISANCE SHUT DOWNS.
On a gas furnace, what energizes the blower
motor in the heat mode?
Answer :Time Delay Fan Switch Temp.Sensing element
When a gas furnace ignites and is under "full-
fire," why does the fan not come on immediately?
Answer :To allow time to heat up before pushing hot air out thru the vents
What is the difference between a yellow gas
flame and an orange gas flame?Yellow indicates not enough air,Orange indicates dust particles being burned
Answer :Yellow indicates not enough air,Orange indicates dust particles being burned
The flame in a gas fired furnace is burning
with heavy yellow tips. What is the problem?
Answer :Not enough air & emitting carbon monoxide
While the furnace is operating, heated air
and flue products spill out of the burner compartment. What is the problem?
Answer :Too much air across the heat exchanger,the flue gases will become too cool& the combustion will
condense and run doun the flue pipe
When the burners ignite, the burner flame is
normal until the blower starts. At this time, continuous roll out occurs. What is the problem?Too much air in the
Answer :A Crack in the Heat Exchanger
Why do propane and butane gas furnaces
require 100% shut off in the event of pilot outage?
Answer :The gas is heavier than air,it will not vent up the flue ,gas can pool & create an explosion
return and supply ducts are both on top
c. low boy
Answer : C
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together