Co/co2 ratio

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jaydebruyne

jaydebruyne

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Sooo...

Let's say you go do a gas safety and the boiler has the following readings on the analyser:

Co: 346
Co2: 10.8
Ratio: 0.0032

Would you

A) AR it
B) pass it and recommend a service
C) pass it with no recommendations
D) ID it
 
like he said..what is ppm .lol

surley, it depends on boiler and class!

some state co reading only, ideals different to baxi or is it open flue?????
the ratio is bordering though so i would be looking at the flue with that co2 reading or heat shields/path!
if its cast then sooted up?

then again i am just guessing on a conundrum and go with A because its getting there.lol
 
Without looking in my book I'd guess at C but as it is so close to being over the co limit and ratio I would still recommend a service.
 
Airside ok? Service and investigate if not it goes off. Readings will never be that high if all is OK.
 
It was a vaillant ecotec pro 24.. My book says max ratio is 0.008 so technically the boiler is well within the safe limits.. So I passed it with a recommendation for a service to bring the co level down.. Just wondered what you guys would have done ... On another not I just changed my email address and now I'm not getting notifications of replies to my threads :/
 
I came across a worcester with readings like that and it just needed adjustments made to the gas valve to sort it out.
 
Screenshot_2016-03-21-20-34-35.jpg

Every reading is too high. It may need gas valve adjustment but I also think it needs a clean or recirculation of poc is happening.
 
Last edited:
I had a Baxi with very high co.....turned out to be a flue seal, but the custard was on holiday so just turned it off until it was replaced.
 
Bloody hell, you gas lot get away with murder. I'm not happy on the oil unless the co is under 20 ppm.
 
SimonG said:
Bloody hell, you gas lot get away with murder. I'm not happy on the oil unless the co is under 20 ppm.
Click to expand...

anything over 100 and theres something wrong with condensing boilers
 
Unless stated in MI's it's 0.008, anything over 0.004 then full service recommended but if it's under 0.008 and MI's don't mention FGA ( so basically all the old ****e ) then you can pass safe if all other checks are as they should be
 
Leo21 said:
I thought it was a blanket 0.004 now?
Click to expand...

Its always been 0.004
0.008 is only allowed after a service to allow for all shiite flying about. Although never had one go up after a service
 
Seems to be a bit of confusion over this so there ya go.

Its been this for ages
Lifted from TB 126

9ca6e980399cbafee366dc09e7107866.jpg
 
julesverne said:
Its always been 0.004
0.008 is only allowed after a service to allow for all shiite flying about. Although never had one go up after a service
Click to expand...

I spoke to gas safe to clarify this and they said its 0.008 and always has been. It's only 0.004 when MI states which is basically all high efficiency boilers. If MIs don't mention FGA at all then you don't have to do it, as long as other checks fall in line
 
Why would you fga a standard efficiency boiler ? Unless the mi's request it naturally
 
c.gas said:
That's because your book is correct
Click to expand...

I disagree post up the page.
The action level is 0.004 (means it needs a service or otherwise)regardless of make or age unless MI's state otherwise.
Im happy to be proved wrong unless you can prove otherwise with an upto date book.

Hence i would be looking at dancins book
 
Vipers got various charts and tables for action levels for all sorts of appliances. Anyone got a viper handy ??
 
julesverne said:
I disagree post up the page.
The action level is 0.004 (means it needs a service or otherwise)regardless of make or age unless MI's state otherwise.
Im happy to be proved wrong unless you can prove otherwise with an upto date book.

Hence i would be looking at dancins book
Click to expand...

For some reason I can't upload a picture :/ but it's from Gas Installation Technology by R D Treloar
 
In my viper it states 0.0008 too
 
image.jpg

Last try. This is from NICEIC CITB Domestic Gas Safety On Site Guide.
 
I think we will image.jpghave to agree to disagree as image below is from tech bulletin 143.
I would trust a technical bulletin over viper everyday of the week.
 
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