NORA BRONZE UPDATED TEST PAPER
QUESTIONS AND ANSWERS SURE A+
✔✔thermal draft is caused by... - ✔✔the pressure drop created by the hot combustion
gasses rising in the chimney
✔✔what causes currential draft? - ✔✔wind passing over the chimney
✔✔what factors effect draft? - ✔✔fans, windows, closed spaces around burner
✔✔what does draft drop through the heat exchanger indicate? - ✔✔heavy soot and
scale deposits in the heat exchanger
✔✔when the combustion gasses get too cold what happens? - ✔✔the water vapor in
the flue gas will condense
✔✔what is a power venter and what is it used for? - ✔✔a fan to pull combustion
products through the heat exchanger and out the building
✔✔a direct vent system relies on what to push gasses out the building - ✔✔the burner,
pre-purge and post-purge control, proper installation
✔✔a sealed shut draft regulator causes what? - ✔✔too much draft over the fire
✔✔chimney draft is affected by... - ✔✔temp difference in chimney and outside air,
barometric pressure, humidity and wind
✔✔air is made up of ____% oxygen and ____% nitrogen - ✔✔20.9% O2 and 78% N
✔✔a liquid co2 tester must be pumped how many times - ✔✔18
✔✔the fluid in a wet kit co2 tester is good for ____ uses - ✔✔200
QUESTIONS AND ANSWERS SURE A+
✔✔thermal draft is caused by... - ✔✔the pressure drop created by the hot combustion
gasses rising in the chimney
✔✔what causes currential draft? - ✔✔wind passing over the chimney
✔✔what factors effect draft? - ✔✔fans, windows, closed spaces around burner
✔✔what does draft drop through the heat exchanger indicate? - ✔✔heavy soot and
scale deposits in the heat exchanger
✔✔when the combustion gasses get too cold what happens? - ✔✔the water vapor in
the flue gas will condense
✔✔what is a power venter and what is it used for? - ✔✔a fan to pull combustion
products through the heat exchanger and out the building
✔✔a direct vent system relies on what to push gasses out the building - ✔✔the burner,
pre-purge and post-purge control, proper installation
✔✔a sealed shut draft regulator causes what? - ✔✔too much draft over the fire
✔✔chimney draft is affected by... - ✔✔temp difference in chimney and outside air,
barometric pressure, humidity and wind
✔✔air is made up of ____% oxygen and ____% nitrogen - ✔✔20.9% O2 and 78% N
✔✔a liquid co2 tester must be pumped how many times - ✔✔18
✔✔the fluid in a wet kit co2 tester is good for ____ uses - ✔✔200
