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Hvacr Gas Heating Esco Questions and Correct Answers Updated 2025
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0 ohms b/w common and low speed wiring, winding is - ANSshorted 1/2 and 3/4 black pipe is installed, cut how many threads - ANS10- 100% shutoff means - ANSgas to the pilot and manifold are shut off 60000 btu/h operating at 50% air - ANS600 cu ft a burner orifice... - ANSmeters gas to the burner a carryover on a gas burner.. - ANSprovides smooth lighting of all burners a cat 4 2 pipe vent system thru roof has an elbow that - ANSpoints down a furnace is converted from natural gas, there is soot, why - ANSlow gas pressure a furnace with the blower motor above the heat exchanger is a - ANSdownflow
a gas furnace is installed in a garage, the burners are - ANS18 inches above floor a good thermocouple produces - ANS30 millivolts a limit switch deenergizes the - ANSgas valve if it overheats a mid efficiency cat 1 natural gas furnace has a temp rise of - ANS40-70 f a spark igniter operates at - ANS7,500 vac adjustable shutters - ANSmix primary and gas air mixed with natural gas is - ANSprimary air ASHRAE specify how much CO - ANS9ppm btu is the amount of heat requires to raise the temp of 1lb of water... - ANS1 degree fahrenheit btu/hr / 1.08 x td calculates - ANSCFM burning 1ft of natural gas produces - ANS900-1100 BTU condensing furnaces work at - ANS90% constant airflow, torque, and speed are types of - ANSECM motors
higher system efficiency in a cat 4 condensing furnace is when water vapor in the flue gas condenses and releases - ANSlatent heat how many of the 3 OSHA conditions defining confined spaces must be met
max level of CO in flue gas is - ANS400 ppm natural gas consists of - ANSmethane nitrogen combines with oxygen to form... - ANSNOX one cubic foot of liquified petroleum produces,,, - ANS2000- 2500 btu pipe joint compound should be applied to - ANSthe male threads, not last 2 threads pressure drop in natural gas piping is due to - ANSfriction or resistance rollout flames are due to - ANScracked heat exchanger severity of shock is determined by - ANSintensity of flow and path testing resistance of a hot surface igniter - ANSallow igniter to cool the first section of duct installed that connects to the furnace is the - ANSplenum the gas pressure is usually - ANS3. the highest concentration of fuel that ignites is the - ANSUEL
what causes the temperature limit safety switch to shut off the burner - ANSfan motor failure what checks the pressure of a furnace - ANSmanometer what draft moves flue gas through the heat exchange - ANSmechanical what is the result of an oversized mid efficiency furnace - ANSthe heat exchanger corrodes what must be present for combustion - ANSair, fuel and ignition source what type of connector is used to control noise in ductwork - ANSvibration eliminators when lockout/tagout is used - ANSthere should be 1 key kept by the electrician when the burners are ignited, the blower is delayed to... - ANSallow the heat exchanger to warm up