Download Hvacr Gas Heating Esco Questions and Correct Answers Updated 2025 and more Exams Heat and Mass Transfer in PDF only on Docsity!
Hvacr Gas Heating Esco
Questions and Correct Answers
Updated 2025
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
- ANSall 3 how much current goes thru the flame sensor? - ANS1-10 microamps if a furnace makes a loud bang upon ignition - ANScheck supply to gas pressure if temperature rise is too high... - ANSincrease fan speed if the main burner lights and after a minute the blower fan comes on but the burner flames waver in one corner... - ANSthere is faulty blower housing if voltage is applied across 2 speed terminals on a fan motor at the same time, the motor - ANSruns too fast igniter in a hot surface ignition furnace doesnt energize - ANScheck for voltage thru pressure switch ignition temp of natural gas - ANS1100- LP gases are - ANSpropane, butane LP has a gravity og - ANS1.5-2.
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
