Uei-test-instruments C127OILKIT Bedienungsanleitung PDF herunterladen (Seite 17)

vented

outside

vented

inside

vented

outside

vented

inside

iNformatioN oN exCeSS air

 •ExcessAir

- Theoretically perfect combustion would have the exact amount of O2 to combine with all of the fuel,

resulting in no excess air.

   •Ifperfectcombustionwere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

   chamber,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Level

O2% (measured) Excess Air %

  Naturalgas 3% 16.7%

  LightOil 5% 31%

  Coal 8% 62%

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

 •Beforetheblowerstartsthepressure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pressureontheprimarysidewillbehigher(Seefigure6)

  –Blowerforcingairthroughtheheatsystem

  –Freshairmaynowenterthefluethroughthebreachintheheatexchange

 •Observethefluegaslevelsandcheckthefollowing;

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

figure 6

figure 5

16 17

1 2 ... 12 13 14 15 16 17 18 19 20

Keine Kommentare

Uei-test-instruments C127OILKIT Bedienungsanleitung Seite 17