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HVACR115 – Mechanical for Gas

HVACR115 – Mechanical for Gas

Gas BurnersGas Burners

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Gas BurnersGas Burners

• The purpose of the burner is to combine the fuel gas with the air for controlled combustion.

• There are three types of burners:– Atmospheric Burners– Power gas burners– Pulse burners

• The purpose of the burner is to combine the fuel gas with the air for controlled combustion.

• There are three types of burners:– Atmospheric Burners– Power gas burners– Pulse burners

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Atmospheric BurnersAtmospheric Burners

• The most common type of burner up until the last few years is the atmospheric type burner.

• They are used in smaller units that are stalled inside the buildings.

• Relies on atmospheric pressure to supply air for combustion.

• The most common type of burner up until the last few years is the atmospheric type burner.

• They are used in smaller units that are stalled inside the buildings.

• Relies on atmospheric pressure to supply air for combustion.

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Atmospheric BurnersAtmospheric Burners

• Main parts:– Gas orifice

• Spud• Fixed Size

– Primary air intake– Venturi tube– Mixing chamber– Burner Ports

• Main parts:– Gas orifice

• Spud• Fixed Size

– Primary air intake– Venturi tube– Mixing chamber– Burner Ports

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Atmospheric BurnersAtmospheric Burners

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Atmospheric BurnersAtmospheric Burners

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Atmospheric BurnersAtmospheric Burners

• Atmospheric burners are found in multiple types as well.– Cast iron– Stamped steel– Single port burners

• Atmospheric burners are found in multiple types as well.– Cast iron– Stamped steel– Single port burners

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Cast IronCast Iron

• Cast Iron are older and heavier burners that are found on the older furnaces.

• These are stamped or poured metal.

• Cast Iron are older and heavier burners that are found on the older furnaces.

• These are stamped or poured metal.

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Cast Iron Cast Iron

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Stamped SteelStamped Steel

• A slotted burner or a ribbon burner that is found on most newer atmospheric type burners.

• Remember atmospheric burners are in furnaces that do not have a draft inducer motor.

• A slotted burner or a ribbon burner that is found on most newer atmospheric type burners.

• Remember atmospheric burners are in furnaces that do not have a draft inducer motor.

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Stamped SteelStamped Steel

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Single Port BurnersSingle Port Burners

• Have one port on the burner, can be in-shot, upshot, or end shot burners.

• These are found on water heaters and some space heaters.

• Have one port on the burner, can be in-shot, upshot, or end shot burners.

• These are found on water heaters and some space heaters.

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Single Port BurnersSingle Port Burners

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Power BurnersPower Burners

• On newer equipment you will find power burners. • Power burners use a fan or a blower to force air

into the burner for combustion.

• On newer equipment you will find power burners. • Power burners use a fan or a blower to force air

into the burner for combustion.

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Power burnersPower burners

• Are used on:– Large commercial units– High efficiency units– Rooftop units– Conversion burners

• Power burners are insuring that there is enough primary air for combustion.

• Are used on:– Large commercial units– High efficiency units– Rooftop units– Conversion burners

• Power burners are insuring that there is enough primary air for combustion.

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Pulse BurnerPulse Burner

• Used in high efficiency furnaces• Considered a low excess burner• Introduces fuel / air mixture at the burner in short

pulses or bursts• More efficient than a conventional furnace

• Used in high efficiency furnaces• Considered a low excess burner• Introduces fuel / air mixture at the burner in short

pulses or bursts• More efficient than a conventional furnace

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Pulse BurnerPulse Burner

• When firing occurs the back pressure in the firing chamber closes the valve. The flapper remains closed until the pressure in the firing chamber drops as the products of combustion leave the chamber.

• This furnace is NO longer in production, it was produced by Lennox, if you ever see one: check the heat exchanger.

• When firing occurs the back pressure in the firing chamber closes the valve. The flapper remains closed until the pressure in the firing chamber drops as the products of combustion leave the chamber.

• This furnace is NO longer in production, it was produced by Lennox, if you ever see one: check the heat exchanger.

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Pulse BurnerPulse Burner

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Pulse BurnerPulse Burner

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Pulse BurnerPulse Burner