UEi EagleX Specifikace stáhnout pdf (Strana 17)

1 . 8 0 0 . 5 4 7 . 5 7 4 0 • W W W . U E i T E S T . C O M

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NFORMAT ION ON

XCES S

• Excess Air

- T h e o retically perfect combustion would have the exact amount of O2 to combine with all of the fuel,

resulting in no excess air.

• If perfect combustion we re possible, there would be 0% excess air

• Because perfect combustion is not possible, you will always have some excess air

• Too high excess air will reduce the time fuel and oxygen are together in the combustion

c h a m b e r, and lower the temperature – two of the T’s of combustion

• Too little excess air, and all of the fuel will not be burnt

- Carbon will form CO instead of CO2

• Typical Excess Air Leve l

O2% (measure d ) Excess Air %

Natural gas 3 % 1 6 . 7 %

Light Oi l 5 % 3 1 %

C o a l 8 % 6 2 %

Excess Air is also one method that can be used to determine heat exchanger integrity

• Be f o re the blower starts the pre s s u r e is higher on the combustion side of exchange (see figure 5)

– Small amounts of CO may leak into the living space side

– Flue gas measurements will be stabilizing as the combustion chamber heats up.

• After the blower starts the pre s s u r e on the primary side will be higher (See figure 6)

– Bl ower forcing air through the heat system

– Fresh air may now enter the flue through the breach in the heat exc h a n g e

• Ob s e r ve the flue gas levels and check the follow i n g ;

- Excess Air, 02 level and CO in ppm for drastic changes.

figure 6

figure 5

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UEi EagleX Specifikace Strana 17