HVAC Gas Heat certification exam 100% Correct!

A gas furnace is to be installed in a garage. The national standards require that the burners and ignition sources must be located ______ above the floor - ANSWER18 inches A good description of how a bi-metal fan switch operates the blower motor on a gas furnace is - ANSWERTemperature on- temperature off Redundant gas valves used on gas furnaces have - ANSWERDual gas shut off seats Burning one cubic foot of liquefied petroleum gas completely will produce approximately ______ BTUs - ANSWER LP gas has a specific gravity of - ANSWER1.5 - 2.0 What is the purpose of a spoiler screw located on a burner, or adjustable-shutters? - ANSWERMix primary air and gas Furnace limit switches are wired in series with the - ANSWERGas valve A technician is using an extension ladder to work on roof top unit. The top of the ladder should extend _____ beyond the support point - ANSWER3 feet A technician determines that a natural gas furnace has a defective heat exchanger. The technician should - ANSWERInform the homeowner and turn the gas off A natural gas furnace usually requires _____ gas pressure at the manifold and burners - ANSWER3.5 in. W.C. The vent system for a condensing furnace is classified as ____ by the National Field Gas Code. - ANSWERCategory IV Type B vent pipe must be kept at least _____ from combustible materials - ANSWEROne inch Typical condensing furnaces have an AFUE rating of at least - ANSWER90% You have installed a Category IV two-pipe vent system that terminates through the roof of the residence. The elbow for the combustion air intake, above the roof, should - ANSWERPoint it down The reason heating thermostat have anticipated is to - ANSWERReduce lag