What causes a boiler to backfire?

What causes a boiler to backfire?

A puffback occurs when a furnace or boiler does not ignite properly and allows oil or gas vapors to build up within the ignition/combustion chamber. When it does finally ignite, the excess fuel in the chamber causes this puffback scenario.

What can damage a boiler?

CAUSES OF DAMAGE TO BOILER. This article written for the National Board of Mechanical Inspectors covers the four most common ways to “destroy a boiler,” including fuel explosions, low-water conditions, poor water treatment, and improper warm-up.

What are the causes of failure of boiler tubes?

There are many reasons for boiler tube failures such as pitting, stress corrosion cracking, stress rupture, creep, erosion, and thermal fatigue [4], [5], [6], [7], [8].

What is the purpose of the draft diverter on a gas furnace?

A draft diverter, or draft hood, plays a vital role in the operation of a combustion chamber, such as a fireplace or furnace. The draft diverter, which consists of a baffle plate positioned directly above the primary flue, regulates the direction and amount of air flowing in and out of the burner.

What is the air that is drawn into the draft hood called?

Dilution air

Does a draft hood provide combustion air?

What is a Gas Appliance, Furnace, Water Heater, or Boiler Draft Hood. Too much draft at the gas burner could result in improper gas combustion. (The gas burner will be below this opening and behind the cover with the louvered openings. The louvers provide combustion air to the gas burner.)

Is it proper to vent a conventional gas furnace out the side of a structure without vertical rise?

The answer is YES and NO! An 80% efficient furnace CAN be side wall vented per National Fuel as Code 7.3. The combustion air flow through the furnace must be controlled or its efficiency will decline. The barometric damper will prevent pulling additional excess air through the furnace.

What advantage is there to maintaining a negative pressure inside the heat exchanger?

56-7) Why must a negative pressure be maintained on the heat exchanger? For safety. To insure combustion products do not leak out into the air stream.

How do I know if my furnace inducer motor is bad?

One of the first indications of a bad draft inducer motor is likely to be the sound it makes. A failing inducer motor may create a noise shortly after a heating cycle begins. This could be a tapping noise, or a humming or whirring sound.

How long does a furnace inducer motor last?

Both types of motors are built to last up to 20 years with minimal maintenance required. The primary reasons that a motor might fail before its time are overheating and excess moisture.

Category: FAQ

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