G2 Gas Technician Module 17 Revised Test Questions With Verified Solutions.
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Course
Gas Technician G2 Licensing
Institution
Gas Technician G2 Licensing
What are the factors governing a conversion? - Answer Availability of gas, efficiency if converted, access to combustible air, satisfactory ductwork, can a chimney liner be installed, clearances from combustibles, manufactures recommendations, if a water heater is also being installed (common ve...
G2 Gas Technician Module 17 Revised
Test Questions With Verified Solutions.
What are the factors governing a conversion? - Answer Availability of gas, efficiency if converted,
access to combustible air, satisfactory ductwork, can a chimney liner be installed, clearances from
combustibles, manufactures recommendations, if a water heater is also being installed (common vent or
power vent), and age of the appliance
Oil fired furnaces are recommended not to be converted at a certain age what is age is this? - Answer
10 years clause 4.3.5
What are the responsibilities of the installer when converting? - Answer Determine that it can accept
gas and will operate satisfactory for a reasonable length of time.
What must be done when converting a boiler? - Answer 1. Check for revirtible flue; center line must be
at leas 12" above burner port
2. Visually inspect for leaks
3. Open drain at bottom and flush until water is clear
4. Sediment can hide a leak at the bottom
Where must a pressure relief drop tube be located on a boiler? - Answer The pressure relief tube must
be withing 12" of the floor
What must be done if a warm air furnace does not have a revertible flue? - Answer Center line of the
flue collar is 12" above burner port and barometric draft regulator can be installed so relief opening is
12" above the highest flue passage.
Can you convert a forced air furnace with a secondary heating surface on the suction side of the air
blower? - Answer No. Unless the heating surface consists of a single cylinder flue pope passing directly
from the primary heat exchange to the flue collar and has a continuously gas tight welded joint.
How do you check a heat exchanger? - Answer 1. Smoke in fire chamber (plug the flue outlet)
, 2. Light and mirror, check for cracks
3. warping and distortion of heat exchanger
4. Rust Spots
5. Gaskets on joints.
How do you determine the firing rate of a replacement burner? - Answer 1. Heat loss calculations of
the building
2. Input or output on rating plate
3. Nozzle size in the burner
How do you calculate nozzle size in an oil burner? - Answer Gallons per hour time 1 US galon of oil (140
000 btu)
ie: 0.75 h x 140 000 btu = 105 000 btu/h
How many btus is 1 Boiler Horsepower? - Answer 33 475 btuh
What are the three types of combustion chamber designs? - Answer 1. Updraft
2. Semi-revertible
3. Revertible - conversion prohibited
What types of burners can be used in a revertible flue? - Answer Atmospheric is not allowed, Fan
assisted can be used but must have spark ignition, pre-purge of combustion air and automatic valve with
dual safety functions.
What two types of atmospheric burners are usually used in conversions? Where would each be used? -
Answer Inshot - usually used on oil fired appliances, must remove oil combustion chamber
Upshot - usually used with coal fired appliances, must remove grate and ash pit doors.
What are the products of complete combustion? - Answer 1. Carbon Dioxide
2. Water Vapour
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