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1 why are some solid-state controllers easy to troubleshoot2 how is a solid-state diode tested explain3 using a
1 what are the three main electrical test instruments used in troubleshooting2 what is the advantage of a plunger-type
1 what standard covers ductboard and methods of connecting and sealing ductboard2 what standard covers flexible duct
1 list the agencies that promote duct standards and briefly describe what they cover2 explain the difference between a
1 describe how two pieces of round sheet-metal pipe are joined2 describe how sheet-metal ductwork is sealed3 describe
1 how far apart should hangers for metal duct be placed2 how far apart should hangers for fiber ductboard be placed3
1 how is the magnetic clutch engaged and disengaged2 what devices may be used to energize the magnetic clutch3 which
1 how does a duct blaster measure the amount of duct leakage2 what are the two main types of duct-cleaning equipment
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