Oil boiler riello burner firing fine until i put it back in boiler ?

[muso58]

Hi Guys
my oil boiler is playing up . lots of smoke .I removed burner fitted a new nozzle same as original .It fires up fine on the bench When i put it back in boiler it cuts in and out . If i remove burner securing bolt and pull it back a little it fires up and works fine ,Its like exhaust cant escape and it is choking .
no blockages in flue .Confused !!

 

[roguetrader]

It will need the oil pressure and air flow adjusting to suit.

 

[muso58]

Hi Thanks for reply
oil pressure is 9 bar as stated on plate . checked and adjusted it slightly .Plate also says air set at .7 . which it was already at . I put my analyzer in flue and its just choking it !

 

[oilhead]

You need to clean out the boiler baffles and flueways. Have you checked the flue terminal?

 

[muso58]

Hi Yes removed flue and cleaned it
removed all baffles and brushed and vacuumed .
Checked all filters including mesh one at tank.
Is it possible boiler could be clogged somewhere that i cant access ? Restricting exit of exhaust gases ?
Im a leisure vehicle tech so do a lot of work on gas but oil is an unknown to me !

 

[Johntheo5]

Is it a indoor installed boiler, the flue gases may be diluting the air intake??

 

[muso58]

Hi sorry not with you . It has a balanced flue . So why is the fact its internal relevant? It is internal by the way. Cheers

 

[Exedon]

Make/model of boiler?
Internal or external very relevant totally different re air supply to burner.

 

[roguetrader]

You said 'removed flue and cleaned it', did you dismantle the whole flue??

 

[muso58]

Yes

 

[roguetrader]

Check flue seals.

 

[muso58]

Only one flue seal .the one on top of boiler . Its rubber and new

 

[oilhead]

boiler model?

 

[muso58]

Hi its a firebird enviromax 26kw condensing combi

 

[muso58]

well i think ill stick to motorhomes and caravans I fitted another new nozzle exactly the same .
Then i decided to really go to town on a decoke .I obviously hadnt been thorough enough .
Still mystfied how the exhaust gases mange to get past all of those baffles and thru the condensate tubes .That was the problem muck round the serrated edges of baffles that is obviously the only way burnt gases get down to bottom of combustion space. Going well now
Every days a school day .
Thanks for all of the replies