B11 burner problem

[Danoil]

Just re read your original post. If you mean you are slackening off the flexi into the pump to get it to fire then check the oil line, filters etc for tightness and to make sure there is plenty of oil getting to the pump.( think agile said this first off).

Also you said you have had training to work on these and also said you have no combustion equipment? Get a FGA and a smoke pump pronto. You cannot set these up properly without either.

 

[exon16m]

The check valve behind the nozzle. A one way valve.

No I am slackening the line that feeds to the nozzle after being through the pump to get it going.

 

[Danoil]

There is no check valve behind the nozzle! There is a solenoid with an electromagnetic coil around it and the pressure pipe leading to the nozzle holder. This could also be partially blocked (rare but still worth a few mins checking) so blow this out with a foot pump/ compressor with an inflatable cone type attachment. And get those combustion gasses checked!

 

[exon16m]

There really is a valve behind the nozzle its part of the service to remove and inspect.

A small inline valve about a cm long removed using a screw

As per : http://www.heating-parts.co.uk/product.asp?prd=200458

 

[Danoil]

Well b**ger me! I apologise, I have never come across that before nor even knew one existed. I'll certainly be checking for one the next B9/B11 I come across!

 

[Burnerman]

I think you'd better b**ger me at the same time.....this is news!
John

 

[Boilerman2]

Most Engineers throw the silly shut off valve behind the Nozzle away it serves no real purpose and on occasions causes trouble I doubt that this is the fault in this case is the OP a Householder or Engineer?? I'm totally confused now!!

 

[Burnerman]

Most Engineers throw the silly shut off valve behind the Nozzle away it serves no real purpose and on occasions causes trouble I doubt that this is the fault in this case is the OP a Householder or Engineer?? I'm totally confused now!!

I have noticed when I run burners on the bench, after I cut the power and the flame dies, there is a squirt of oil from the nozzle for a second or two afterwards.
Is this what that valve is supposed to prevent?
John

 

[exon16m]

Yes would also serve as a back up should the solinoid valve fail open.

I would be reluctant to throw a part that has been specified by a fluid mechanics and combustion engineer at worcester. I am sure if they could increace profit by removing it would have been at the production line

 

[Boilerman2]

Ask any experience oil Engineer - only worcester put these silly little diaphragm devices in their burners Myson, Trianco etc were all using the inter PL10 burner at the time they never found a need to fit such a device and actually NO they don't stem oil flow in the event of a solenoid valve failure either!! that is why most "experienced Engineers" realise that the part is completely superflous !

 

[oilhead]

The part you refer to rarely causes problems. A quick blow through will prove its integrity. It is there to eliminate 'dribble' and should be easily overcome by the pump pressure. First thing is check the oil pump pressure. If correct, then follow up with electrode setting and spark generator. On this burner, it is possible to check the spark with the burner out, just pull the connector off the solenoid coil. If you suspect that the solenoid valve is passing, then run the burner through purge with the solenoid disconnected and check the blast tube for 'wet' oil.
If you are bleeding the oil supply to get the burner to light, then this suggests that there is a problem with the pump, so back to point one!!!

 

[exon16m]

When disconnecting the line from the pump to the nozzle tube should that be pressurised when the system is off (mine is) which is why I suspected the check valve

 

[Burnerman]

I've never noticed any back pressure here - just the usual dribble on disconnection......its an interesting issue, this one!
John

 

[exon16m]

update it was the tank oil filter .... changed and now fixed !

 

[Boilerman2]

Nearly 6 Months after the fault 1st appeared!!