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 Post subject: premix burners
PostPosted: Mon Oct 02, 2017 7:48 pm 
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hi guys
just a simple question really
on a premix burner, if you removed the injector and lets say forget to put it back in on a boiler service :error:

would it make much/ any difference :dunno:
ps i'm talking premix burner here not yer old style burner :?


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 Post subject: Re: premix burners
PostPosted: Mon Oct 02, 2017 8:39 pm 
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Simple answer, yes.

Everything needs to be set and fitted correctly.

As an example Vaillant 400 series has a different one fitted to each fan assembly for each sized boiler

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 Post subject: Re: premix burners
PostPosted: Mon Oct 02, 2017 8:44 pm 
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Yes the CO would be off the scale then the burner would baffle out

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 Post subject: Re: premix burners
PostPosted: Mon Oct 02, 2017 9:12 pm 
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reason am bringing this up
recently serviced baxi duotec and injector was missing :error:
boiler was working ok before starting as ran hot tap, water hot and no noise.
never fga, so couldn't say what co/co2 was though but heat exchanger was clean and nothing out of the ordinary.

injector sits inside the venturi and when you look inside there's abit of a restriction in there anyway without the injector,
so maybe it doesn't make any real difference :dunno:


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 Post subject: Re: premix burners
PostPosted: Tue Oct 03, 2017 7:46 am 
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How can you even begin to think about servicing a Duotec without using an FGA?

The manufacturers instructions actually point out that you must check the injector/disc is in place when reassembling the boiler after a service.

This must be a wind up.

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 Post subject: Re: premix burners
PostPosted: Tue Oct 03, 2017 10:34 am 
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gas4you, what the manufacturers say and what people do are two different things.
only posting my findings, the injector was missing when the fan/ collector etc was removed for servicing, and boiler appeared to be working ok but although at this point I didn't fga, so c0/c02 may well have been through the roof I don't know.
internally the burner and heat exchanger where clean as a whistle though .
anyway new injector was fitted, boiler serviced and fga so everything now as it should be.
just looking for answers to why boiler was running apparently ok without an injector ::b


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 Post subject: Re: premix burners
PostPosted: Tue Oct 03, 2017 10:53 am 
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Not familiar with the boiler but surely the injector size will have a direct effect on the gas rate?


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 Post subject: Re: premix burners
PostPosted: Wed Oct 04, 2017 7:37 am 
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bingolancer wrote:
gas4you, what the manufacturers say and what people do are two different things.
only posting my findings, the injector was missing when the fan/ collector etc was removed for servicing, and boiler appeared to be working ok but although at this point I didn't fga, so c0/c02 may well have been through the roof I don't know.
internally the burner and heat exchanger where clean as a whistle though .
anyway new injector was fitted, boiler serviced and fga so everything now as it should be.
just looking for answers to why boiler was running apparently ok without an injector ::b


Not implying any of us read the MI's all the time, just trying to answer your question as to if it was needed.

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 Post subject: Re: premix burners
PostPosted: Wed Oct 04, 2017 10:42 am 
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toolbox wrote:
Not familiar with the boiler but surely the injector size will have a direct effect on the gas rate?

you would think so, but pcb and fan speed also plays a part.


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 Post subject: Re: premix burners
PostPosted: Wed Oct 04, 2017 11:09 am 
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gas4you wrote:
bingolancer wrote:
gas4you, what the manufacturers say and what people do are two different things.
only posting my findings, the injector was missing when the fan/ collector etc was removed for servicing, and boiler appeared to be working ok but although at this point I didn't fga, so c0/c02 may well have been through the roof I don't know.
internally the burner and heat exchanger where clean as a whistle though .
anyway new injector was fitted, boiler serviced and fga so everything now as it should be.
just looking for answers to why boiler was running apparently ok without an injector ::b


Not implying any of us read the MI's all the time, just trying to answer your question as to if it was needed.


as you said previously, on the valiant and other makes of boiler the injector/ restrictor varies in diameter depending on output.
the thing about the duotec range though, is that the injector size, fan and gas valve are all the same on both 40kw & 24kw

we all know that a 40kw boiler uses more gas than a 24kw and that the pcb/ fan speed also plays a part in gas rate
so maybe on these boilers, you might get away with forgetting to fit the injector, giving that size doesn't seem to matter :dunno:


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 Post subject: Re: premix burners
PostPosted: Wed Oct 04, 2017 8:12 pm 
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It is my understanding that although the fans and gas valves are the same it’s the injector that is different in each but vaillant supply these as an ‘all in one’ unit for each size boiler

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