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

 

[newcastle phill]

That's for a condensing boiler

Ive no idea about what boiler it is on about. Just posted this.
I always follow MI so never need this Tb

 

[jaydebruyne]

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

Why wouldn't you?

 

[dancinplumba]

Why wouldn't you?

Is it required ?

 

[jaydebruyne]

Is it required ?

I thought it was required for all gas appliances with a flue to ensure its burning correctly..

 

[Leo21]

Why wouldn't you?

Because it wasn't designed to be tested, it'll be room sealed anyway, and your just looking for trouble?

 

[jaydebruyne]

Because it wasn't designed to be tested, it'll be room sealed anyway, and your just looking for trouble?

Looking for trouble covers about 80% of my daily diary lol

 

[Leo21]

I thought it was required for my gas appliance with a flue to ensure it burning correctly..

Nope, flame picture, burner pressure and gas rating.

 

[jaydebruyne]

Nope, flame picture, burner pressure and gas rating.

Ok.. Well you've taught me something new cheers Leo

 

[julesverne]

That's because your book is correct

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

 

[newcastle phill]

Vipers got various charts and tables for action levels for all sorts of appliances. Anyone got a viper handy ??

 

[jaydebruyne]

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

For some reason I can't upload a picture :/ but it's from Gas Installation Technology by R D Treloar

 

[c.gas]

 

[c.gas]

Sorry 1st one not very clear

 

[c.gas]

Picture not very clear when I post it although it is when I take it

 

[jaydebruyne]

In my viper it states 0.0008 too

 

[c.gas]

Last try. This is from NICEIC CITB Domestic Gas Safety On Site Guide.

 

[julesverne]

I think we will have to agree to disagree as image below is from tech bulletin 143.
I would trust a technical bulletin over viper everyday of the week.

 

[julesverne]

Flowchart from tb 143

 

[plumben]

Vipers got various charts and tables for action levels for all sorts of appliances. Anyone got a viper handy ??

Mines on the dash of my van its too cold out

 

[c.gas]

I think we will View attachment 25611have to agree to disagree as image below is from tech bulletin 143.
I would trust a technical bulletin over viper everyday of the week.

this technical bulletin is only for commissioning a condensing boiler incorporating an air/gas ratio valve

 

[julesverne]

Air gas ratio valve is tb 126

 

[c.gas]

Not sure then mate but if you look at the title when you click on Tb 143 it says when commissioning condensing boiler with air gas ratio valve. Can't find tb146 so will have a look tomorrow

 

[REDSAW]

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

for a open flue boiler its 0.004,
for a combi its 0.008.
unless otherwise by m.i.

thats from the latest niceic book!

 

[hammers4spanner]

I do love how gas safe move the ratios around not that long ago they were saying that 300 ppms now its 350.

No wonder we have confusion

 

[julesverne]

Im just gonna take my guidance from tb 143 tb 126 and kane guide which also states 0.004

 

[wattsie1987]

MI's is what we all should be working too and engineers judgement I wouldn't be walking away from something with over 200ppm

 

[Leo21]

MI's is what we all should be working too and engineers judgement I wouldn't be walking away from something with over 200ppm

I wouldn't either, but why? It's room sealed.

 

[wattsie1987]

I wouldn't either, but why? It's room sealed.

The chance of products entering the property through the boiler are next to none. But there's a reason the Co is high and that's something isn't right so I'll make it right because that's what I'm paid to do. (And because I like falling straight to sleep at night)

 

[GrahamM]

I find it hard to believe some people are not using an FGA to confirm safe combustion levels on a non-condensing appliance!
Why have we got published action levels of 0.008 for non-condensing appliances if not required?
Why have Vokera compacts, Linea's, Worc 28i Junior, Baxi combi 80's etc been fitted with flue gas sampling points?
How many linea's etc are you overlooking as safe when combustion levels are through the roof?

Don't get it!

 

[Leo21]

Because there's no requirement, and no reason. Flame picture, burner pressure, gas rating. It's been ok for over twenty years! And it hasn't stopped being ok.