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1 describe how to install a dovetail takeoff fitting on a ductboard trunk2 what are some of the limitations on the use
1 how do the staples that hold duct insulation together work2 what is the correct spacing for the mechanical fasteners
1 if an electrical load on an air-conditioning system is not working what must the technician try to determine2 what
1 how does condenser size affect the eer2 what has the predominant effect on the amount of subcooling produced in the
1 discuss the evolution of the heat exchanger2 discuss the operation of an atmospheric burner3 explain why furnace
1 list the four categories of gas-fired furnaces based on flue-gas temperature and pressure2 explain the difference
1 why are lp gases considered more hazardous than natural gas2 describe the two types of flames and their
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