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1 explain the causes of flue gas condensation and how it can be stopped2 explain the cause of soot formation on the
1 list agencies that establish standards for gas furnaces2 list agencies that perform testing to verify equipment
1 discuss the origin of natural gas list the three broad categories of fuel gases2 what are the products of complete
1 if a burner fails to light or the flame sensor fails to detect a flame what happens to ensure the system is safe2
1 what is the temperature rise of a furnace with a supply-air temperature of 130degf and a return-air temperature of
1 what is the one advantage of a standing pilot for a gas-fired space heater2 list the general sequence of operation
1 why are most furnaces manufactured today either category i or category iv furnaces2 what is the difference between a
1 how is net stack temperature determined2 what is the lowest temperature at which butane can be used as a heating
1 what is the most common manifold pressure for propane furnaces2 a technician is clocking the gas usage of a gas
1 list the safety precautions that should be observed when starting a gas furnace2 explain the difference between
1 list the four functions of a furnace gas valve describe how a main gas valve gets electrical power to open2 how many
1 how is a humidistat similar to a low-voltage switch2 explain the reason why adding humidity to a residence increases
1 what is the standard transformer va rating for most hvacr systems2 why are heat anticipators used in low-voltage
1 what part of the furnace does the air travel through first in all furnace cabinet configurations2 why should
1 can the furnace drain and the air-conditioning drain be run with a common drain2 list the different types of gas
1 what is the purpose of the orifice why is it not a good idea to drill out orifices in the field2 what components are
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1 how should the output of an oil furnace ignition transformer be tested2 what components on an oil furnace should be
1 what is the co 2 percentage for a perfect stoichiometric mix of oil and air2 why do we not try to adjust the co 2
1 what smoke spot number represents correct combustion2 how is net stack temperature calculated3 discuss the
1 describe the procedure for purging a two-pipe system2 what pieces of information are necessary to determine
1 what voltage does the ignition transformer provide to the electrodes2 how does a cad cell sense the flames3 what does
1 what are the typical pressure settings for a pressurereducing valve and system relief valve in a hot-water oil-fired
1 how is an oil furnace heat exchanger shaped2 what is the purpose of the refractory3 what is the typical output
1 compare the efficiency of a mid-efficiency oil furnace to an older traditional oil furnace2 what is the advantage of