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Various aspects of oil burner systems, including burner design, draft measurement, combustion testing, fan operation, controls, and efficiency considerations. It provides detailed information on topics such as the most common burner design, draft improvement methods, flue gas analysis, fan characteristics, thermostat operation, primary control functions, and the impact of various factors on system efficiency. The document delves into the technical details of oil-fired heating systems, making it a valuable resource for hvac technicians, students, and professionals working in the field of residential and commercial heating systems.
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In an electric circuit for the wattage to remain the same if the voltage drops, the amperage must - ✔✔Increase Atomizing type burners were designed to burn which type of fuel - ✔✔Type 2 fuel oil Pour point problems with outside above ground fuel tanks can be partially relieved by - ✔✔Reducing the pour point of No. 2 fuel oil by blending it with No. 1 fuel oil. A fuel oil storage tank cannot be installed - ✔✔In the furnace room with 5' of heating unit. The primary purpose of a fuel pump on a high-pressure burner is to - ✔✔Deliver oil at a constant and regulated pressure to the nozzle If the vacuum reading is substantially above the calculated reading, (with the burner running) the cause may be - ✔✔Plugged fuel filter, Kinked oil supply line, Check valve sticking With most new flame retention burners, the motor speed is - ✔✔ 3450 To check for proper nozzle line cut-off, the pressure gauge is installed in the - ✔✔Nozzle Port Fuel units are generally set at the factory at - ✔✔100psi The oil burner nozzle in a high-pressure burner performs the following functions - ✔✔Atomizes the oil Provides a pattern of oil spray Delivers a fixed amount of oil
The nozzle flow rate, spray angle and pattern are directly related to - ✔✔•Tangential slots
. Swirl chamber Orifice Cold oil or high viscosity problems may be eliminated by - ✔✔•Increasing pump pressure and reducing nozzle size
In which type of system does the ignition transformer stay on for the full time the burner is running? - ✔✔•Intermittent •b. Constant A typical ignition transformer is of what type? - ✔✔step up During a normal start-up, when current is applied to a split phase burner motor with an open centrifugal switch - ✔✔•The motor will not start The switch opens when the motor has almost reached full speed. - ✔✔•Centrifugal The most speed(s) used in American made burners have been: - ✔✔3450 rpm Because burner fans have beveled blades any dirt or lint in the blade will - ✔✔•a. Reduce the amount of air for combustion The fan-limit control on a warm air unit is used to: - ✔✔•Shut off the burner at a predetermined temperature •Start the blower at a predetermined temperature Stop the blower at a predetermined temperature In all residential oil heating systems, the high limit control must be - ✔✔Line voltage and wired in series with the primary control Low voltage thermostats are more widely used than line voltage thermostats because - ✔✔They are more sensitive to ambient temperature When a thermostat appears to be out of calibration it is important to first - ✔✔Be sure the thermostat is level Check to see that the hole behind the thermostat is sealed off properly .Be sure that the thermostat is acclimated to the room temperature
The primary control must be capable of - ✔✔•Reacting to the absence of flame •. Controlling the ignition and motor
By replacing an old burner with a new retention head burner, off-cycle losses are reduced because - ✔✔It restricts the draft induced air flow through the burner A simple, effective, yet inexpensive way to increase on-cycle system efficiency is to - ✔✔Match the nozzle to the heating load The _ are important for both on and off cycle efficiency in a fire tube boiler - ✔✔Limit Controls Before lowering the temperature of a hot water boiler, consideration must be given to the - ✔✔Design of the heating The boiler or furnace is not the only source of heat loss. The heating system can lose heat through - ✔✔•insulated steam pipes
When running warm air trunk lines or branches through such areas as crawl spaces, garages or attics the duct work must be: - ✔✔Direct supply, direct return When using a ____ heater, it is necessary to maintain sufficient boiler water temperature to heat the domestic hot water - ✔✔Skim the boiler through a nipple at the water level after a few days of operation A reverse acting aquastat is used in a hydronic system to - ✔✔Stop the circulator when the water temperature falls below a preset temperature Burner air fans are manufactured to very close tolerances because an unbalanced fan can - ✔✔•Put a strain on motor bearings
What is the correct procedure for performing a combustion efficiency test? - ✔✔•Draft •b. Smoke •c. CO The temperature of fuel oil can affect? - ✔✔flow rate Which of the following does not affect draft? - ✔✔Boiler Design What does AFUE stand for - ✔✔Annual fuel utilization efficiency Which substance will cause the formation of sediment at the bottom of a fuel storage tank? - ✔✔Water
•c. Air flows caused by house exhaust fan The following are important factors that affect chimney performance: - ✔✔Wind Burner firing rate Air flows caused by house exhaust fan The flue connection from the outlet of the boiler or furnace to the chimney base should as _____ as possible to maintain good draft. - ✔✔short A common source of air leakage into the chimney is: - ✔✔Loose-fitting clean-out door at base of chimney What is the minimum net temperature needed at the breeching of an oil-fired appliance to prevent condensation problems - ✔✔285F The main parts of the chimney venting system used in oil heated houses are: - ✔✔•Chimney
A "sealed and insulated chimney system" requires: - ✔✔The flue pipe be increased one size The draft inducer fan on a side wall venting system should be installed: - ✔✔Close to the outside wall Power chimney venting: - ✔✔•Uses the existing chimney
•b. Additives •c. Cut with Kerosene In new homes, due to their tight construction, it is necessary to provide outside combustion air to the burner. - ✔✔true In new homes, if a chimney is going to be used, it must: - ✔✔•Be correctly sized for the appliance and be insulated Distribution systems (ducts or pipes) should be: - ✔✔correctly sized What part used in the flame quality indicator is common to the oil industry today? - ✔✔a cad cell eye In energy efficient homes of the future, oil may be used to provide: - ✔✔Heating The flame quality indicator (FQI) monitors flame: - ✔✔Brightness Which of these conditions can cause burner short cycling? - ✔✔• heat anticipator that is not set properly.
The most common motor speed(s) used in American made burners are: - ✔✔3450 rpm If a home has an oil-fired system with an inside oil storage tank, what is added as a safety feature to protect against liquid fuel fires? - ✔✔a fusible plug Excess air in the combustion process lowers system efficiency by: - ✔✔increasing draft If an oil has a high viscosity: - ✔✔• It is thicker oil under low temperatures When a cad cell see an oil burner flame its resistance should be: - ✔✔Below 1,600 ohms of resistance When a cad cell is in the dark, its resistance should be: - ✔✔Above 10,000 ohms of resistance What two flame detection devices are used in oil fired primary controls? - ✔✔•Bimetal and cadmium sulfide Which component is used to control primary air in a high-pressure gun burner? - ✔✔•An adjustable air damper Which component is used to increase air velocity in the air tube of a high-pressure gun burner? - ✔✔The adjustable air collar The flame color characteristic of a high-pressure gun burner should be: - ✔✔A yellow-orange color For every pound of fuel oil that is burned, how many pounds of primary air are required'? - ✔✔14. For every pound of fuel oil that is burned, how many pounds of excess air are required'? - ✔✔7.
A high CO2 reading in an oil-fired appliance could indicate: - ✔✔•b. A proper and efficient fire A properly set up and adjusted oil fired appliance should produce a CO2 measurement of: - ✔✔•10% to 12% A common over the fire draft for an oil appliance is: - ✔✔-.01" we to - .02" we A common breech draft for an oil appliance is: - ✔✔-.03" WC to - .06" WC
. If the draft through an appliance is too high, what adjustment should be made. - ✔✔• Adjust the barometric damper to more of a closed position Breaking up oil into small droplets is called: - ✔✔Atomization What is the approximate safety timing of a stack primary control? - ✔✔60 to 90 seconds On a high-pressure gun burner, what two problems can prevent oil from flowing to the nozzle? - ✔✔b. A broken coupling and a plugged inline filter