Riello rdb2.2 firing issues

2004myles

Hi. Would appreciate some guidance and help. Had to move an oil boiler and tank outside. It got a bit of jostling about.
Now I have it connected back up and when I started the boiler after bleeding it fired up ok.
Then after 10 minutes started smoking badly so I stopped it. Then it would not restart anymore.
I got a new jet and still won't fire up.
What is happening is I hit the reset and the motor and fan turn. Then after 10 sec or so a click and then 2 seconds later cuts out.
Fuel seems ok and spuirts out from bleed screw with i loosen bleed screw with Allen key So I take it pump is ok.
Filter inside the pump is clean.
New photocell
Swapped out with another controller unit.
New Nozzel.
Removed burner from boiler and there is oil misting out there when I hit reset but I don't seem to see an electric arc

jimf

sounds like a fuel pump issue

and I have to say it but you should not be firing the burner outside the boiler


you may see no ignition ark anyway as the photocell will be picking up false light


time to call somebody to diagnose and set up boiler for you properly

2004myles

Thanks for the reply. Can I ask why would a pump cause a spark not to happen. The photocell was covered so I'd expect a spark?also there is always oil around the nozzle area when I remove the burner from the boiler to inspect

agusta

The only way you can prove a pump is with a vacuum gauge and pressure gauge.The pump doesnt control the spark.the control box and electrodes do.When the boiler started smoking badly,was that black smoke coming out the flue

2004myles

agusta wrote: »

The only way you can prove a pump is with a vacuum gauge and pressure gauge.The pump doesnt control the spark.the control box and electrodes do.When the boiler started smoking badly,was that black smoke coming out the flue

Yes the black smoke was coming from the flue. Def can't see a spark so I've put a new photo cell in. Swapped out control unit. Was told this was good so maybe it's possible it's faulty aswell. I did notice the electrodes are out about 5mm ahead of Nozzel. Guy from work said maybe it's been quinched by the fuel as it's out too far?

jimf

see post 2 refer to bottom line

2004myles

jimf im only trying to learn as I go along. Already had a guy out to service it and he left saying to get more fuel and he'd be back. Silly me paid for the service and guess what? He never came back. So I'm only trying to learn now because it would be of benefit anyway. But at the end of the day there is no spark so maybe with some little advice from here I might be able to fit it

jimf

I can appreciate what you are trying to do myles

we all have to start somewhere but the dangers of a badly set burner are scary

ie badly set up boiler can be spewing 10000 ppm of co out the flue

2004myles

jimf wrote: »

I can appreciate what you are trying to do myles

we all have to start somewhere but the dangers of a badly set burner are scary

ie badly set up boiler can be spewing 10000 ppm of co out the flue

True. You are correct. It will need an analysis done alright. I Def don't want to pollute and harm others. I'd love to get it always running to save on cost. Cheers

2004myles

I suppose my last question was if the electrodes are too far out from the nozzle , is it possible the arc won't happen because it is been flooded with oil. Because after the last service I just had a few days ago from my reading of the rdb manual the electrodes seem to be too high. They are about 7mm in front of Nozzel.

agusta

If someone set up electrodes 7mm from the nozzle,they have no idea what there at.The burner pump pressure,nozzle,setting are set up to suit the boiler that the burner is going into.There are not set the same for every boiler.There are alot of variables in play.

jimf

the arc from the transformer occurs milliseconds before oil is delivered from the pump


having the electrodes too far in front of the nozzle would mean they are impinging into the flame pattern thus causing bad atomisation of the fuel


thus causing droplets to enter the combustion chamber which can not burn properly

antietam1

2004myles wrote: »

I suppose my last question was if the electrodes are too far out from the nozzle , is it possible the arc won't happen because it is been flooded with oil. Because after the last service I just had a few days ago from my reading of the rdb manual the electrodes seem to be too high. They are about 7mm in front of Nozzel.

I appreciate you are going to get an expert to finalise this but in the meantime you need to formalise your learning.
Try the library.
I'm an electrician who worked on boilers in the millions of btu's but I do very little on domestic boilers.

2004myles

I'm going to try one more thing tomorrow. I'll reset the electrodes as I'm Def not happy with the way my service guy left it. It's a rdb2.2.
.6 Nozzel. I'm going to set the electrodes 4mm apart and 2mm Infront of Nozzel. Thanks for the guidance guys

antietam1

2004myles wrote: »

I'm going to try one more thing tomorrow. I'll reset the electrodes as I'm Def not happy with the way my service guy left it. It's a rdb2.2.
.6 Nozzel. I'm going to set the electrodes 4mm apart and 2mm Infront of Nozzel. Thanks for the guidance guys

If I recall it's centimetres gap times 30,000 so if you know the output of the trafo that will tell you what distance gap size it can jump

2004myles

Got it started today anyway. I adjusted the electrodes closer to the nozzle. 2mm. Fired up straight away. So much for thinking my service guy was reliable. Thanks for your help guys.

2004myles

So now I must get it analysised as I can hardly trust the guy now