burner output

ringy1 · 28 Aug 2009

Just wondering on setting up a burner, say for instance the max boiler output is 90,000 B.T.U would you set the burner up to work at max output or what are the deciding factors wheter to set it up to run at max output or to set it up to run at 70,000 or 80,000 B.T.U instead?

jiltedjohn · 28 Aug 2009

ringy1 said:
Just wondering on setting up a burner, say for instance the max boiler output is 90,000 B.T.U would you set the burner up to work at max output or what are the deciding factors wheter to set it up to run at max output or to set it up to run at 70,000 or 80,000 B.T.U instead?

you would set it up o the manufacturers recomended setting as very few boilers are range rateable nowadays, most have just one recomended setting (unless they are oil in which case other factors come into play)

bengasman · 28 Aug 2009

Leave it as it is, it is not a diy job

ringy1 · 29 Aug 2009

yes but what about for oil fired boilers i had a post up a few weeks ago i have come across a few boilers that are under firing, the nozzles seem to be wrong on some i have come across so on a service i was just wondering what to set the boiler output at because in boiler manuals they have different output ranges? So what factors come into play when making my decision for the boiler output?

kevplumb · 29 Aug 2009

err the load on the system might be a good point to start

casius66 · 29 Aug 2009

why do you think the nozzles are wrong?

ringy1 · 29 Aug 2009

0.50usg was the nozzle on one boiler i came across on a firebird popular 90 and i was just wondering for future reference cause i came across a few like that so when im setting them up properly will i set a boiler to work at max output or what factors should i be looking out for if i was to set it up at a lower heat output

Terrywookfit · 29 Aug 2009

Calculate the load.
Set burner to required output using manufacturers data.
Do not de-rate below minimum as combustion figures will cock up.

ringy1 · 29 Aug 2009

Terrywookfit said:
Calculate the load.
Set burner to required output using manufacturers data.
Do not de-rate below minimum as combustion figures will cock up.

Bear with me now im new to this but when im servicing a boiler how am i ment to calculate the capiticity of water in a system to make sure the burner is firing a sufficient heat output is there a rule of thumb or something like calculate how many rads are in the house for a certain heat output?

Boilerman2 · 1 Sep 2009

If it ain't Broke...don't mend it, and to find out about Oil Burner Nozzles go on a EOGB, or Riello Burner Course, or do yer OFTEC OFT101.

Danfoss do a really good oil product guide which has nozzle throughput graphs to allow you to calculate heat input from Nozzle size and fuel pressure

A LITTLE KNOWLEDGE IS A DANGEROUS THING!

roguetrader · 1 Sep 2009

ringy1 said:
im setting them up properly

if you dont know the answers to the questions you are asking, how do you know you are setting them up properly? you sound dangerous.

ringy1 · 1 Sep 2009

Thanks boilerman2, i have a USB pen stick with all the oil boiler manuals on it so i can check up on boiler manufacture specifications on all oil boilers, i bought it through an oftec training centre but you know you can come across some burners that have any old nozzle put into them by some cowboy, like my last post i had up i came across .50usg 80H nozzle in a firdbird popular 90 that was under firing that i serviced and i changed it to a .65 80S at 9.5bar oil pressure which gives out a heat output of 90,000 B.T.U but i could of set it up for 80,000 B.T.U by reducing the oil pressure to 8bar and putting in a .65 80H nozzle or 70,000 B.T.U by putting a .6 80H nozzle in at 8 bar oil pressure. That boiler was under firing like you said so i changed the nozzle and my flue gas analysis worked out perfect but why set it up for 90,000 B.T.U why not 80,000 or 70,000. I know it depends on the load on the system but how do you know how many rads 70,000 B.T.U will do or how many rads will 80,000 or 90,000 B.T.U will do, so you can make that step up.

holty · 1 Sep 2009

just one simple question.do you have an oil analyser of some sort.mostly digital these days. but remember doing my coarse with a liquid egg timer sort old school. cant remember the kit.anyway its an essential way of setting an oil burner up, as well as smoke pump.its not all about nozzle outputs etc.

ringy1 · 1 Sep 2009

Rogue Trader wrote: if you dont know the answers to the questions you are asking, how do you know you are setting them up properly? you sound dangerous. Ringy1 wrote: Im making sure i have the proper heat output for the size of the heating system so the boiler is not under firing, notting dangerous bout that cause the nozzle would of being wrong in the first place thats the reason for changing it.

ringy1 · 1 Sep 2009

yep i have all the gear

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burner output

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