Co/co2 ratio

[jaydebruyne]

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

 

[hammers4spanner]

What ppm's ?

 

[newcastle phill]

Typo 346 ?

 

[REDSAW]

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

 

[hammers4spanner]

Ratio borderline??

Last i knew it was above .0050 to AR could be wrong tho

 

[Millsy 82]

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.

 

[REDSAW]

Ratio borderline??

Last i knew it was above .0050 to AR could be wrong tho

unless it complies with manufacturers recomendations and they are available and if > 0.004 then it shall require full service and inspection.

 

[newcastle phill]

A bloody good service and if that doesnt work - a power flush

 

[wattsie1987]

Airside ok? Service and investigate if not it goes off. Readings will never be that high if all is OK.

 

[jaydebruyne]

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 :/

 

[julesverne]

have a look TB143
there is a good flowchart in with action levels and because im kind the link is below

http://www.centralheating.co.uk/sys...stion_Ratio_Checks_-_Boiler_commissioning.pdf

 

[macackau]

I came across a worcester with readings like that and it just needed adjustments made to the gas valve to sort it out.

 

[Leo21]

Aren't the ppm,s supposed to be under 250 on those?

 

[wattsie1987]

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.

 

[Toxic Ted]

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.

 

[SimonG]

Bloody hell, you gas lot get away with murder. I'm not happy on the oil unless the co is under 20 ppm.

 

[ShaunCorbs]

Bloody hell, you gas lot get away with murder. I'm not happy on the oil unless the co is under 20 ppm.

anything over 100 and theres something wrong with condensing boilers

 

[c.gas]

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]

I thought it was a blanket 0.004 now?

 

[julesverne]

I thought it was a blanket 0.004 now?

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

 

[newcastle phill]

Seems to be a bit of confusion over this so there ya go.

Its been this for ages
Lifted from TB 126

 

[dancinplumba]

 

[jaydebruyne]

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

My book says 0.008

 

[c.gas]

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

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

 

[c.gas]

My book says 0.008

That's because your book is correct

 

[jaydebruyne]

View attachment 25605

What book is this from?

 

[dancinplumba]

What book is this from?

Haha can't remember

 

[c.gas]

Seems to be a bit of confusion over this so there ya go.

Its been this for ages
Lifted from TB 126

That's for a condensing boiler

 

[dancinplumba]

Why would you fga a standard efficiency boiler ? Unless the mi's request it naturally

 

[c.gas]

Why would you fga a standard efficiency boiler ? Unless the mi's request it naturally

Piece of mind and force of habit