smoking riello

spinny

.ive been working on riellos for 10 + years with great luck.However recently we have encounted the smoking riello after its annual cleaning. We clean the boiler and replace the nozzle with the same pattern, size and angle nozzle as before do an efficiency and find black smoke the boiler and burner setting have not been changed and when checked they are set up according to the manafucture specs. how can a burner chage so much when everything is the same as it was the year before. Many times the oil flow was restricted when we arrived to do the service and this problem becomes more pronounced. my belief has been the nozzles are bad and i keep changing them until it straightens out.

techheat_2

Are you doing an efficiency test afterwards? You can't be sure unless you test!

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spinny

smoking riellos

the efficienty test is how we know its smoking the boiler has no observation port its a piece of glass you can not set this boiler by eye.

J.C.A._3

Time to check.....

The oil. Has the oil come from the same source? Are they treating the fuel? Are they OVERTREATING the fuel?(Yes, this happens).Directions from the treatment manufacturers are the ONLY way to go.Too much can cause problems and too little will not achieve desired results, sometimes in an disasterous manner.

Another thing to be checking is pump pressure. Is it at the recommended PSI/KPA setting? As to the oil lines and condition of the fuel filters, I'm with the Garber school of thought. I like the vacuum gauge installed at the top of the filter outlet. It makes troubleshooting almost instantaneous. I also like what Constantine was saying about different filters being used "cascade" style. Filter the big chunks at the tank and make it finer as you move toward the burner.

Nozzles, as a rule are NORMALLY not the cause of a poor firing burner. There really has to be another reason for poor performance. The rules are pretty stringent for nozzle manufacturers and the chances of getting a bunch of out of calibration nozzles are/is pretty slim unless you got them all from the same box that was bounced around badly in transit.(If they came from the same box, maybe they were dropped in shipment hard enough to move things, but this is doubtful)

Start at the supply and work forward toward the burner.The problem will show itself with proper testing. Chris

mark_40

personally .....

i prefer "Coihiba's" ... the taste is much better than the "riello" brand ... too much sulfur ...

Wayne M. Lawrence

smoking riello

Have you looked into the chamber to check if there is any flame impingment?. After several years of cleanings the chamber could be full to the bottom of the blast tube. Or the chamber/target wall could have fallen in. I would pull the burner to check/ clean out the chamber. If there is a separate water heater on the job and the boiler has been off for the summer,this is where I would start. Next I would check the running suction line vacuum, over 6"H.G. you may have a restricted suction line. Check the pump pressure, if a 2 pipe lift system, a restricted return would increase the pump pressure. It seems to be a pressure boiler, you mentioned no sight door. What is the over fire draft? On a residental positive pressure boiler you should have aprox +.01 . If negative draft over fire, you could have flame detachment- the flame is being pulled off the head. If heat exchanger is clear, (it should be cleaned/checked ) try increasing nozzle size+ adjust to the proper settings. Hope this helps, Wayne

Weezbo

use a blow out gun on the lines ,First.

then check the fuel oil tank for water,the nozzel change out is nice and all buh why do it if it isnt needed?perhaps the changing of the nozzel isnt what corrects the burn at all,as my friend says "throwing nozzels at it" isnt the answer...if you are going to treat symptoms treat all of them.

Bruce M.

Have you checked the Electrode Settings?

Is this an OEM Riello or a conversion? If it is an OEM, is the nozzle the type and size specified by the manufacturer?

Mijola

I know you probably did this already but make sure the disk at the end of the nozzle is clean with no carbon... The slots must be clean otherwise it will make the burner screw up.... also take a look down the tube where you put the nozzle assembly back into the burner make sure there is no carbon or nothing impinging on the flame. If you can't see the flame how do you know the chamber didn't fall in and is changing the burner flame that would surely cause it to soot up... hope this helps.