ESCO Study set- gas furnaces Test Questions and Answers 100% Solved

ESCO Study set- gas furnaces Test Questions and Answers 100% Solved Burning one cubic foot of natural gas will produce approximately _____ BTU's ️️900- 1,100 BTU The National Fuel Gas Code classifies a vent system for a condensing furnace as; ️️Category IV what type of draft is used to move flue gas through the heat exchanger and into the venting system in modern gas-fired furnaces? ️️Mechanical A customer complains that a 2 year- old, direct, hot surface ignition furnace will not light. The inducer motor runs, the pressure switch closes, and the igniter begins to glow, but there is no ignition. The furnace locks out while attempting to light. After resetting the furnace, 17 VAC is measured at the gas valve and the technician correctly concludes; ️️The gas valve is