nozzle

Mellow_2

Hi, has anyone had problems with new nozzles failing alot? If so how can you prevent this problem? I ask this because we install a alot of buderus g115/21 with s-120 indirects and 2109 controls. The buderus uses a realo burner with a .50 nozzle (just changed one today). The .50 nozzles stops lighting sometimes.......This happens with new and old nozzles with no sign of pluggage. We use garber filters and try not to let dirt plug the nozzles. I have in the past had bad luck with .50 nozzles but .65 and higher are normaly fine. any help would be appreciated. THANK YOU

Tom M.

Delavan line filter

We use these on start ups that we do for a sheet metal company when they install .50 GPH Carrier units. They have a new one that has flare fittings so you don't have to hard pipe it or supply an adapter. Hope this helps.

Tom M.

http://www.delavaninc.com/pdf/line_filter_ad.pdf

john@TR

what brand?

I never really had problems with .50 nozzles as long as I had a Garber filter on the system. Are you using hollow or solid patterns? A .50 60' R Monarch was my nozzle of choice for Riellos for a long time. Later I found good results with a Delevan .50 60' B and sometimes Danfoss .50 60' AB's. Maybe it's not the nozzle at all but a combination of air and pump pressure settings in that particular boiler. I had a Thermodynamics boiler go 6 years without a nozzle change; just changed the Garber and checked the chimney base every year. Had 12% CO2 every time, zero smoke, 350'F net stack every year.

Mellow_2

settings ok

delevan nozzles only used. I have -.02 at the breach +.01 O.F...... 335'f or so(removed both side baffles. A 12.7 co2 zero smoke 88.9 eff. IT IS SWEET..... I just don't know if the nozzle is to blame or the dirt. I think its dirt but I have great filters and can't see how it can get by the filter. Trying to send pics hope it works.

Weezbo

maybe you are using an F-5 rather than an F-3......

assuming nothing:) do you low range the riello's or mid range them? perhaps the turbulator needs to be set closer to O .

Unknown

Do they look baked from the chamber side ?

Are the G115 boilers positive pressure over fire ? I've always wondered how that affects the nozzle outlet . With no sign of pluggage , it sounds exactly like the situation my friend experienced with a direct vent , positive pressure Peerless and Riello BF5 . No signs of plugging , but the nozzle would stop up .

In the Riello instruction manual , they suggest using some type of amulet for certain situations . I forget in which situation to use them though .

Ken D.

Nozzles

The oil quality is not what it used to be. Minute particles of debris can work it's way through the filters and strainers to plug the nozzles- especially in a 2 pipe system. Take a .50 nozzle apart and see the size of the orafice and tangible slots. It does not take much to block them. We have been using dual oil filters. A standard wool or rayon filter first and a Garber or Wix filter at the burner. It does work. Westwood and others have dual set up available as a package. I have had good success with making sure the oil system is clean. Change filters. Clean and flush strainers, oil lines, nozzle lines and nozzle adaptor. When changing the nozzle, I clean and flush the drawer assy. nozzle line and prime the line with clean oil before installing the nozzle. When the high velocity oil rushes into an empty drawer assy., any dirt left over will be rammed through the nozzle strainer, into the slots or orafice causing poor combustion. Priming helps. There are nozzles available for anti- plugging of small gph flow. Delavan has Del-O-Flo and others have secondary strainers in the nozzles. Delavan has an aftermarket strainer available for a retrofit into nozzles to help. Also, subtle differences in the spray patterns of nozzle makers can make a difference on certain units.-K.D.

Firedragon_4

I agree and with

a higher pump pressure being used (Riello) you MUST have no dirt (abrasives) in a fuel containing a water soluble ingredient (red dye).

There's a lot of documentation around that proves that the more abrasiveness within the nozzle, the more tangential slot damage. That damage will increase and distort fuel flow in the swirl chamber and cause erratic fires and light-offs.

Without enough filtration you will just get either damage or plugging sooner if the oil is not 'near perfect'.