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If a technician inspects the interior of a combustion chamber and finds large quantities of unburned oil, he would correctly conclude that ____. - ✔✔The stack switch may be defective and the primary control unit may be defective A special tool has been designed to help remove and install nozzles from the burner. It is called a nozzle wrench and it ____. - ✔✔Has an outer wrench that holds the burner in place, while the inner wrench holds the nozzle and minimize the chance of cracking the porcelain The number engraved on the nozzle indicates ____. - ✔✔How many gallons of oil per hour the nozzle will deliver at a given input pressure
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If a technician inspects the interior of a combustion chamber and finds large quantities of unburned oil, he would correctly conclude that ____.
The stack switch or stack relay ____. - ✔✔Shuts down the burner if it does not sense heat in the flue products A condensing oil furnace operates at a higher efficiency because part of the heat output is ____. - ✔✔Latent heat To make combustion efficiency tests, a hole must be made ____. - ✔✔In the flue pipe before the draft control In a single-stage fuel oil pump, the oil is fed to the burner by capillary action. - ✔✔False Nozzles can be cleaned to remove any carbonization by using a very fine wire brush. - ✔✔False For complete combustion and higher efficiency, the oil spray and the air flow off the blast tube both turn counter-clockwise. - ✔✔False Oil burner nozzles are designed and rated at 100 psig nozzle pressure. - ✔✔True The tangential slots in an oil burner nozzle are to control the volume of oil flow through the nozzle. - ✔✔True
. After several seasons, buried oil tanks are subject to water in the oil. - ✔✔True Tanks that are to be installed underground must be protected against corrosion. - ✔✔True
The __________ is an oil piping component that allows a one-pipe system to function as a two-pipe system. - ✔✔Oil DE-aerator __________ is a colorless and odorless gas. - ✔✔Carbon Monoxide Modern oil burners are referred as high pressure burners, as the oil is delivered through the burner at a pressure of about ___ psi. - ✔✔ 100 - 150 There are two main types of oil pumps used on gun-type burners, ______ and _______ - ✔✔Single Stage,Two Stage_ Fuel pumps are equipped with _______ at the inlet to prevent particulate matter from entering the pump. - ✔✔Screens How can a technician tell the difference between an up-flow furnace and a down-flow furnace? - ✔✔Down-flow air is drawn in from the top & forced out at the bottom duct work and is located below the furnace. Up-flow air is drawn in at the bottom and forced out across the heat exchanger and out the top
. Name the six parts of an oil burner nozzle. - ✔✔Orifice, orifice disc, body, retainer, filter and distributor What tests can a technician perform on an oil furnace that will check the combustion efficiency? - ✔✔Draft,Smoke,Net Temperature (flue stack),Carbon Dioxide. Define atomization. - ✔✔Using Pressure to change liquid to small particles of Vapor.
. What would happen if the narrow spray angle nozzle were used in a round combustion chamber? - ✔✔the flame would impinge on the combustion chamber most likely creating excess carbon monoxide and less heat . An oil burner equipped with the CAD cell relay will ignite, run for about ninety seconds, and cut off. What is the first thing the service technician should do? - ✔✔Make sure the cad cell is clean, check for alignment, adjust for correct fire What meters flow of fuel oil into the chamber - ✔✔nozzle What generates approximately 10,000 volts needed for spark - ✔✔Ignition transformer What devices that will shut burner down in case the burner doesn't fire - ✔✔Stack switch What creates turbulence in the air-oil mixture to increase efficiency - ✔✔Flame retention ring What changes its resistance depending on the amount of light it senses - ✔✔CAD cell What is insulated with ceramic to prevent electrical ground - ✔✔Electrodes