Unit 32 Oil Heat

What grade of fuel oil is used in commercial and light residential work?

#2

Name the six parts of an oil burner nozzle.

1)Orifice 2)Orifice Disc 3)Body 4)Retainer 5)Filter 6)Distributor

Modern oil burners are referred as high pressure burners, as the oil is delivered through the burner at a pressure of about ___ psi.

100 PSI

Oil burner nozzles are designed and rated at:

100 psig

Fuel oil has ____ btu of heat

140,000

The heat content of one gallon of No. 2 fuel oil ?

140,000 btu/gal.

An auxiliary tank and booster pump system is required if the oil supply is ____ below the oil burner pump.

15 feet or more

The process of breaking up a liquid into fine droplets is called ?

Atomization

Where do i put a hole to do a combustion efficiency test?

Before the damper

What changes its resistance depending on the amount of light it senses

CAD cell

__________ is a colorless and odorless gas.

Carbon Monoxide

__________ is the amount of carbon left in a sample of oil after it is vaporized, changed from a liquid to a vapor, by boiling it.

Carbon Residue

When any product containing hydrogen and/or carbon reacts with oxygen to release heat energy, the process is called ?

Combustion

Oil lines can be constructed of _____, ______,______ pipe connected with malleable fittings.

Copper, Wrought Iron, or Steel

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 is located below the furnace. Up-flow air is drawn in at the bottom & forced out across the heat exchanger & out the top

What tests can a technician perform on an oil furnace that will check the combustion efficiency?

Draft, Smoke, Net Temperature (flue stack), Carbon Dioxide.

What is insulated with ceramic to prevent electrical ground?

Electrodes

A filter will allow an oil pipe system to operate as a two pipe as a one pipe

False

T or F: for complete combustion and higher efficiency, the oil spray and the air flow off the blast tube both turn counter-clockwise.

False

T or F: in a single-stage fuel oil pump, the oil is fed to the burner by capillary action.

False

T or F: nozzles can be cleaned to remove any carbonization by using a very fine wire brush.

False

T or F: Cad Cell eye uses heat in combustion chamber

False. It uses light

____ and ____ pipes should be pitched toward the tank opening to prevent the formation of oil traps.

Fill ,Vent

What creates turbulence in the air-oil mixture to increase efficiency?

Flame retention ring

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 minimizes 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

What devices creates 10,000 volts to create for spark?

Ignition transformer

What devices that will shut burner down in case the burner doesn't fire?

Ignition transformer

What generates approximately 10,000 volts needed for spark?

Ignition transformer

To make combustion efficiency tests, a hole must be made ____.

In the flue pipe before the draft control

Flame retention ring does what?

Keeps the flame controlled and tight

A condensing oil furnace operates at a higher efficiency because part of the heat output is ____.

Latent heat

The CAD cell is a safety device that uses what to prove ignition?

Light in the combustion chamber

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

The grade of fuel usually used in residential and light commercial units is ____.

No. 2

What would happen if the narrow spray angle nozzle were used in a round combustion chamber?

Not efficient, not enough heat

What devices meters oil into the fuel chamber?

Nozzle

What meters flow of fuel oil into the chamber?

Nozzle

The __________ is an oil piping component that allows a one-pipe system to function as a two-pipe system.

Oil DE-aerator

Whats another name for cad cell relay?

Primary control

Fuel pumps are equipped with _______ at the inlet to prevent particulate matter from entering the pump.

Screens

The stack switch or stack relay ____.

Shuts down the burner if it does not sense heat in the flue products

There are two main types of oil pumps used on gun-type burners, ______ and _______

Single Stage, Two Stage

When the oil supply is above the oil burner pump, the pump and supply would normally be a ____.

Single-stage pump, one pipe system

Nozzles have specs on the side, what are they?

Spray pattern, Gallons per hour at 100 psi, Spray angle

In a two pipe configuration one pipe is the ____ and the other acts as the ____.

Supply, Return

The portion of a nozzle assembly that produces rotation of the oil spray is called the?

Swirl Chamber.

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.

When would I use a single stage one pipe system?

The tank is higher than the pump

A furnace has puddle of oil, what might have happened?

Tripped on safety, and kept pushing it

T or F: oil burner nozzles are designed and rated at 100 psig nozzle pressure.

True

T or F: tank piping should be inspected regularly for imperfections and leaks.

True

T or F: tanks that are installed underground must be protected against corrosion.

True

T or F: the tangential slots in an oil burner nozzle are to control the volume of oil flow through the nozzle.

True

Define atomization.

Using Pressure to change liquid to small particles of Vapor.

After several seasons, buried oil tanks are very subject to _________

Water under the oil

When would i need an auxiliary booster pump?

When the tank is more than 15 feet deep

Improper combustion can lead to the following:

a. excessive carbon monoxide production b. smoke condition around furnace c. wasted oil