Firebird HE Boiler

John.G

Jimf or Wearb might answer this.

What size oil nozzle is installed in the above if its rated 20 to 26kw and its required output is 26kw.

If not specified are these boilers delivered at ~ 20/21 Kw an if so what size nozzle?.

What burner make(s)are they now using?

What is the equivalent of the old Enviromax model like the C26?

Relation is thinking of replacing a 16 year old Firebird 90S (like mine) with the above mainly because the heatpac is falling apart and the boiler top itself is fairly badly corroded even though the boiler itself is running perfectly well.

I know that the consensus was that the Grant is a better option, does this still hold true?

Wearb

Assuming you are talking of the ones with the elco burner, it is still mostly an enviromax from the look of it. I've yet to come across one. I have however read manuals, to be prepared.

The trap and post purge should alleviate some of the most troublesome problems of that design.

I would still recommend that it be fired at its lowest allowed output. It is also ESSENTIAL that these be PROPERLY serviced every year.

I have a lot of c26's on my books. Most of the ones well looked after are still like new, the others will have a short life span. Hopefully they have improved the outside housing. They were prone to paint flaking.

For settings look at elco burner manual.

I'm sure Jim or Tom will know a lot more about these than I do. Over to you Munster guys....

jimf

up to now i have only commissioned a few with the elco burner and serviced maybe 2 or 3 didnt see any particular issue

i still sit on the grant vortex fence 15/26 would be a very good match for johns requirement comes factory set at mid range at about 70k btu

nozzle fitted to this model .60x60es at 8bar pressure

John.G

Thanks Jim,

Any comment on the below which I posted somewhere else I think

I have a SE Firebird 90s which came with a 0.6 usgph which I think was supposed to give a 20/21 kw output at say 85% gross efficiency which seems by and large reasonably correct.

what I've often noticed is that the nozzle is stamped 0.6usgph and 2.37kgs/hr, 0.6 USGPH is 2.27 LPH, a volumetric measurement. so what is the significance of this 2.37 kgs/hour, does it just refer to the maximum mass of liquid that the nozzle can atomize, 2.37 kgs/hr = 2.89 LPH at a kerosene SG of 0.82. I can only think that the usgpm is delivered at 100psi, 6.9 bar so an increase to 8 bar should ~ deliver 2.44 LPH but still doesn't match the 2.27 LPH (1.79kgs/hr) at 8 bar, below.

Wearb

To really confuse people, the nozzle ratings given for us/g use a different density fuel at a different pressure than that used for kg.

I have long forgotten all the details and use what's on the manuals to guide me.

I think I gathered most of my info from both Delvan and Danfoss pdf's

jimf

i never really get into the nitty gritty of nozzles john other than use the nozzle the manf spec and pressure

once the above are correct its good starting point to set up a boiler properly

any differences anyway id say would hardly be noticeable in the yearly eff of the boiler

with your own model boiler its very common to find them running at 85% eff over the years the heat loss through the flue gasses can increase to well above the average 230dg then of course the eff with drop accordingly

John.G

https://www.boards.ie/discussion/comment/118357995#Comment_118357995

Two questions.

Do Firebird still use a hydraulical ram to shut off the fan air intake on burner shutdown?.

And

Why does the Elco low Nox burner do a post purge for up to 30secs? each time the burner cuts out normally and will not fire up if it doesn’t see a permanent live which can be “fooled” by linking the switched live to the permanent live. I was wondering if there are any safety implications, the relatively large (50MW) gas and oil fired boilers that I was very familiar with would only do this if the burner tripped on flame failure or fuel rich conditions, monitored by oxygen analysers (2), the boiler would then do a 60 sec (post) purge followed by lockout. If the Elco is designed to do this in the event of flame failure then the burner logic must reflect this, ie, allows a post purge before  lockout?. It might be instructive to do this on the permanenty wired burner and see if does do a post purge by simulating flame failure. Of course if it is only deemed necessary for this why then does it do a post purge with every normal burner shutdown?.  This post purge must impact a fair bit on the efficiency as OF boilers can cycle dozens of times per day. Tom44 below says that you “ lose the post purge benefits”, what are these benefits?.

https://www.boards.ie/discussion/comment/114422713#Comment_114422713

jimf

riello 40 series burners are still on the go they are still using the damper but no longer fitted to firebird afaik a great burner

the post purge with the elco burner is more of a clean out of the combustion chamber after each cycle run

imho i dont really know if it is needed but i dont know all that firebird know

it probably is a feature to help with the sooting that was a feature of the original enviromax/silver series of boilers