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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
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
1 list the grades of fuel oil and give a brief description of each type2 what is the difference between distillate oil
1 what are some possible causes of delayed ignition2 on some furnaces little pops and pings can be heard before the
1 what are some probable causes of noise and vibration2 what causes rollout of burner flames what are some possible
1 what is an indication of too much primary air what is an indication of too little primary air2 what happens if there
1 list the seven categories of complaints with gas furnaces2 what is the purpose of the draft diverter on natural-draft
1 list some types of oil pump problems2 when should an oil pump internal bypass plug be removed3 how can a leak in the
1 what is a disadvantage to direct venting an oil-fired furnace2 what problems can arise from an oversized oil storage
1 what is the function of an oil safety valve2 give a prestart checklist when checking a newly installed oil furnace3
1 what is indicated by a frothy stream of oil in the oil supply line2 list the general types of oil furnace problems3
1 how can a defective ignition transformer be diagnosed2 what are some common types of ignition system problems other
1 what are the symptoms of an oil pump with a leaky shutoff2 what resistance readings indicate a good cad cell3 what