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Jabba

19-05-09 05:29 PM

carbon monxoxide concentration in boiler flue?

Any heating engineers on here?

If so, please can you remind me what is the optimum/target concentration for CO in a domestic combi-boiler flue?

I have it in my head that it should be <400ppm and ideally closer to 100ppm but it's been a while since I had to think about this :rolleyes:

TIA

Bluefish

19-05-09 05:53 PM

Re: carbon monxoxide concentration in boiler flue?

Quote:

Originally Posted by Jabba (Post 1913691)

not used a flue gas analyser in ages, iirc reading had to be 0.0040 or less

embee

19-05-09 07:44 PM

Re: carbon monxoxide concentration in boiler flue?

Funnily enough I was looking through an installation doc for a boiler yesterday. This is a Viessman but I'd guess it's pretty typical for gas combustion.

http://i258.photobucket.com/albums/h...ensfluegas.jpg

nakedblue650

20-05-09 08:24 AM

Re: carbon monxoxide concentration in boiler flue?

At 400ppm the boiler should be stripped down and serviced, as stated in gas safety regs, and in accordance with manufacturers instructions. 100ppm is fine especially if standard efficiency not high efficiency. CO2 ratios will vary with manufacturers but as a benchmark 9.2% +/- 0.5% will generally put you in the ball park.

Quote:

not used a flue gas analyser in ages, iirc reading had to be 0.0040 or less

I assume your ex-trade then!:p

HTH

nb650

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