Combustion Analysis 080302aB Flashcards
What % over input rating is considered over-fired?
3%
How much carbon monoxide is acceptable in the products of combustion?
Less than or equal to 400ppm
What is the pressure in the vent of a forced draft appliance?
+0.4” to +0.6” w.c.
What is the ultimate amount of CO2 for the combustion of natural gas?
12%
What is the relationship between oxygen and carbon dioxide in combustion?
As oxygen increases CO2 decreases
What is the typical amount of oxygen in the products of combustion?
3%-9%
Where should a combustion analysis be done on a fan assist appliance?
Immediately down stream of the inducer fan
What would you find when doing a combustion analysis test on an appliance that has not enough air being provided for combustion?
Low CO2 reading and zero O2 reading
What would you find when doing a combustion analysis test on an appliance that has too much air being provided for combustion?
Low CO2 reading and high O2 reading
What is the typical CO2 reading in the products of combustion from burning natural gas?
7-10%
High levels of CO2 and low temp. flue gas would be an indication of what?
High efficiency
What happens to efficiency as flue temperature increases?
Efficiency decreases
What happens to efficiency as carbon dioxide concentration increases?
Efficiency increases
