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A comprehensive set of questions and answers related to oil burners, covering various aspects of their operation, maintenance, and troubleshooting. It is a valuable resource for hvac technicians seeking to enhance their knowledge and understanding of oil burner systems. Questions on topics such as combustion efficiency, draft regulation, fuel delivery, flame detection, and safety procedures.
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According to NFPA31-2001, what is the minimum size of the vent pipe on an oil storage tank ✔✔1 1/4 inch
Nozzles are available with three different spray patterns: ✔✔Solid, semi-hollow, hollow
What type of motor is used on a residential high pressure oil burner ✔✔Split phase
The most common motor speeds used in amerian made burners are ✔✔1725 and 3250 rpm
If an oil has a high viscosity ✔✔It is a thicker oil
A service technician performs a combustion efficiency test. There is too much overfire draft. What can the technician do to decrease the amount of draft in the system ✔✔Open the barometric
A technician arrives on a service call for an oil fired furnace the overfire draft reading is +.02" WC. And the breach is -.04" WC. What could be the cause for this type of problem. ✔✔A plugged heat exchanger
While performing a combustion effiency test on an oil fired furnace. A smoke reading of #5 is obtained. Which of the following could cause this problem. ✔✔Insufficient combustion air
What is a possible problem if an oil fired furnace has a stack temperature reading over 750 degrees F ✔✔Excessive combustion air.
On a stack mount primary control system, the thermostat is set to call for heat. The system sparks but does not fire. A further check shows that the burner motor is not in operation. Which of the following could be the cause of this problem? ✔✔The burner motor could be defective.
On a high pressure gun burner, what two problems can prevent oil from flowing to the nozzle? ✔✔A broken couple in hand a plugged inline filter.
In what position should the cold contacts of a stack relay be at the start up of an oil fired furnace? ✔✔The closed position.
An oil pump has to lift oil from an oil storage tank that is located underground. Each foot of vertical lift will cause a vacuum on the suction line of ✔✔1" hg
If a high pressure gun type oil burner has sufficient spark and adequate oil pump pressure, which of the following could be a cause of system malfunction? ✔✔A plugged nozzle.
In all residential oil heating systems, the high limit control must be ✔✔Line voltage and wire in series with the primary control
When testing a fuel unit cut-off, the pressure at the nozzle port should: ✔✔Drop and hold at about 80% if the pumps pressure setting
Older installations used a remote mounted heat sensing primary control. The type of flame detector is often referred to as the: ✔✔Stack relay
A customer has replaced a mercury bulb thermostat. The furnace heats the house, but tends to cycle on and off several times per hour. The most likely cause would be: ✔✔The anticipator is set too low
The data plate on a residential furnace states that there should be a 70F temp rise. The technician takes a return air temp. Reading of 70F and a supply air temp reading of 180F. Which of the following could be a possible problem. ✔✔The air filter could be dirty.
When a cad cell is sighting flame, it's resistance is: ✔✔Below 1,600 ohms of resistance
When a cad cell is located in the dark, it's resistance is: ✔✔Above 100,000 ohms of resistance
What two flame detection devices are used in oil fired primary controls? ✔✔Bi-metal and cadmium sulfide
Which component is used to control primary air in a high pressure gun burner? ✔✔An adjustable air collar.
Which component is used to increase air velocity in the air tube of a high pressure gun burner. ✔✔The static disk
The flame color characteristics of a high pressure gun burner should be : ✔✔A yellow orange color
Which of the following may prevent ignition of the flame? ✔✔-20F oil
Which of the following statements are true? ✔✔The tips of the electrodes on a high pressure gun burner are positioned just outside the oil stream
Which of the following could cause a stack mount primary control to cycle off on the safety switch? ✔✔Spot build up in the bi metal sensor
The spark gap setting on an electrode assembly should be ✔✔5/16"
The capacity of a high-pressure oil burner nozzle is rated in ✔✔GPH
stack thermometer commonly has a ranger from ✔✔200 to 1000
Atomizing type burners were designed to burn which type of fuel ✔✔No. 2 fuel oil
The use of a _______ will help an oil burner start smoother ✔✔A delayed oil valve
If the F-F terminals on a cad cell primary control are jumped out, what would be the action of the system on start up ✔✔The system would not start.
A service call is received. ✔✔CFM
A technician is servicing an oil fired furnace. ✔✔Terminals 2 and 3
One gallon of No. 2 fuel oil contains approximately ✔✔140,000 BTU's
Pour point problems with above ground fuel tanks containing #1 fuel oil can be partially relieved by ✔✔Relocating the outside fuel filter and strainers to the inside
What does AFUE stand for ✔✔Annual Fuel Utilization Efficiency
insufficient draft due to poor chimney design may be improved by Installing a: ✔✔Draft inducer
The two properties of lightweight combustion chambers are: ✔✔Rapid heat up and rapid cool down
Which of the following is only the efficiency test that can be done in the field ✔✔Combustion efficiency
When installing a vent for outdoor combustion air,NFPA recommends an outdoor air opening of one square inch of free space for every _______ BTU per hour of fuel consumed ✔✔5,
Which of these conditions can cause burner short cycling ✔✔A heat anticipator that is not set properly
When testing an ignition transformer using the arc test method, the arc should be a minimum of: ✔✔1" to 1.25"
Which of the following will affect draft ✔✔Chimney height
If a home has an oil fired system with an inside oil storage tank, what is added as safety feature to protect against liquid fuel fires? ✔✔A fuse type globe valve.
Excess air through the combustion process lowers system efficiency by: ✔✔Increasing flue gas temperature
A burner that has been properly set up and adjusted may still experience an occasional hard start or puff back caused by: ✔✔Low voltage input to the transformer
If a cad cell is "seeing" light when the thermostat calls for heat ✔✔The primary control will not energize
Air is composed of oxygen and nitrogen in what percentages? ✔✔21% oxygen and 78% nitrogen
Pulsating oil pump pressure can be caused by: ✔✔A dogged fuel strainer
Flash point of a fuel is an indication of: ✔✔The lowest temperature that a fuel will flash but not burn continuously
A significant difference between the CO2 reading over the fire and at the flue is an indication of: ✔✔Air leakage in the furnace
When adjusting the electrode assembly of a non-flame retention oil burner, what is the measurement (height) from the center of nozzle to the tip of the electrode ✔✔1/2" to 9/16"
The size of the oil line supplying a burner should be no less than ✔✔3/8" id
If a technician performs a combustion efficiency test on an oil fired furnace and measures too high of a CO reading, which of the following could cause this to happen? ✔✔Not enough air for the fuel air mixture
A technician is servicing an oil fired furnace that uses a cad cell primary control. The control locks out after a brief period of time. Which of the following can cause this to happen? ✔✔The cad cell does not sense light.
When using an intermittent cad cell primary control, which two wires are used to energize the burner motor and ignition transformer with 120V? ✔✔The orange and white wires
Which of the following can cause the oil burner overload protector to trip? ✔✔A seized oil pump
Where is a delayed oil valve installed when used with a high pressure gun burner? ✔✔After the oil pump before the nozzle
What is the purpose of delayed oil valve? ✔✔It delays the oil pressure to the nozzle
Which type of spray pattern is most often used on nozzle rates below 1.0 GPH ✔✔Hollow
What is the purpose of the barometric damper used on an oil fired furnace? ✔✔It controls the draft through the system
What type of lubrication should be used in the burner motor of a high pressure gun burner ✔✔ 20 weight non-detergent type oil
A high CO2 reading in an oil fired furnace could indicate ✔✔A proper and efficient fire
A properly set up and adjusted oil fired furnace should produce a CO2 measurement of ✔✔10% to 12%