G2 Gas Technician Module 22 Revised | Questions
and Answers
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Terms in this set (35)
What pressure does 14.74 psia
atmospheric pressure
exert on the earth at sea
level?
1. Total BTU of appliance if greater than 400000 you
What two things mean you
must bring in combustion air.
must bring in combustion
2. If house is tight construction you also must bring in
air.
air.
What is the maximum flue 450 F is the max this is because safety concerns of
gases should be for a having high heat in a combustible building and the
natural draft system? hotter the gasses the more inefficient the system is.
Why?
What is the minimum flue Greater then 127 F, this is when the flue gases will
gas temperature should condense causing corrosion due to its highly acidic
be? Why? nature
They are used with high efficient or condensing
furnaces. They condense the flue gases to release
What do special venting
more heat back into the building. Latent heat of 1 lb of
systems do?
water vapor converting to liquid will release 970 btu
back into the structure.
What does direct venting Supplies combustion air directly from the outside and
do? expels flue gases directly to the outside.
, What is an example of a Positive - Hi eff. furnace
positive vent pressure Non positive - natural draft
system? Non - positive
system?
What does flue loss If the appliance is a condensing system.
determine?
What is a type A vent? They are chimneys made of masonry or steel
Are double walled vents that can run through a
What are B vents?
ceiling to the outside
1. They are double walled insulated vents with interior
What are Type L vents? wall constructed of stainless steel
Where are they used? 2. They are used when heat/corrosion could be a
What is max flue temp? problem
3. Must not exceed 550 F
1. They are single walled flexible stainless steel pipe or
What is a BH Vent? When S636 schedule 40 pvc plastic pipe.
is it used? What kind of 2. Used in high efficient condensing furnaces
flue temps? 3. Use in low flue temperatures and positive vent
pressures
1. They are single wall vent connectors made of
What are type C vent
galvanized steel.
connectors? What are
2. They are not allowed to go through floors, ceilings
some limitations?
or concealed areas of the building structure.
What must be done to an It must be insulated
exterior chimney?
When using the vent sizing They must fall between the min and max on the chart
tables what must be done
with the fan assisted
appliances btuh?
and Answers
Save
Terms in this set (35)
What pressure does 14.74 psia
atmospheric pressure
exert on the earth at sea
level?
1. Total BTU of appliance if greater than 400000 you
What two things mean you
must bring in combustion air.
must bring in combustion
2. If house is tight construction you also must bring in
air.
air.
What is the maximum flue 450 F is the max this is because safety concerns of
gases should be for a having high heat in a combustible building and the
natural draft system? hotter the gasses the more inefficient the system is.
Why?
What is the minimum flue Greater then 127 F, this is when the flue gases will
gas temperature should condense causing corrosion due to its highly acidic
be? Why? nature
They are used with high efficient or condensing
furnaces. They condense the flue gases to release
What do special venting
more heat back into the building. Latent heat of 1 lb of
systems do?
water vapor converting to liquid will release 970 btu
back into the structure.
What does direct venting Supplies combustion air directly from the outside and
do? expels flue gases directly to the outside.
, What is an example of a Positive - Hi eff. furnace
positive vent pressure Non positive - natural draft
system? Non - positive
system?
What does flue loss If the appliance is a condensing system.
determine?
What is a type A vent? They are chimneys made of masonry or steel
Are double walled vents that can run through a
What are B vents?
ceiling to the outside
1. They are double walled insulated vents with interior
What are Type L vents? wall constructed of stainless steel
Where are they used? 2. They are used when heat/corrosion could be a
What is max flue temp? problem
3. Must not exceed 550 F
1. They are single walled flexible stainless steel pipe or
What is a BH Vent? When S636 schedule 40 pvc plastic pipe.
is it used? What kind of 2. Used in high efficient condensing furnaces
flue temps? 3. Use in low flue temperatures and positive vent
pressures
1. They are single wall vent connectors made of
What are type C vent
galvanized steel.
connectors? What are
2. They are not allowed to go through floors, ceilings
some limitations?
or concealed areas of the building structure.
What must be done to an It must be insulated
exterior chimney?
When using the vent sizing They must fall between the min and max on the chart
tables what must be done
with the fan assisted
appliances btuh?
