Trio boiler / Beckett afg bang at startup

gchevm

Can’t solve this bang issue at startup. I set oil pressure to 160 as rep. requested, over fire draft .02, flue draft .05, co2 averages 11 to 12%, nozzle is 60B 1.20 Delavan, afg burner. This burner speed out has a longer tube and Z spec having issue of how to measure also. See video. https://www.youtube.com/watch?v=W5TW7BIRrhw
Thanks for any and all help!!

EBEBRATT-Ed

Are you at or below the MFG recommended firing rate? 1.20 nozzle at 160 psi=1.52 gph. I can't read your rating plate.

Could be electrode settings, igniter going bad oil supply problem.

To me in the video it seems to light instantly but hard.

If i couldn't find anything after rechecking all adjustments and combustion test I would reduce the firing rate with a smaller nozzle (like 1.00) retest the combustion and see if that helps

gchevm

I forget at moment mfr and location is 2hrs away. However I double check electrodes, new nozzle and all adjustments. Has a 15/15 pre post purge. FYI this is a completely new system I installed in a new home. I have called Rep and waiting for reply. He is also the one that spec’d 160lbs on that nozzle. This is a three past high silicone, low mast unit with a AFG M tube with conic shield tube. One of my thoughts is to under fire with a 1.0 60B. Just need to get stack to 335/350 degrees. That’s so much for your input. Updates to follow.

EBEBRATT-Ed

Down firing may not be the fix but it might show you what direction to go in. More prepurge may help if the control will do that

STEVEusaPA

I think it’s too much combustion air. What was your excess air number and net stack temp?
What’s the model number?
Are you sure that model wants -.02 over the fire? Triple passes usually want zero to positive, and some want zero at the breech or test port.
Draft and excess air will affect your stack temperature more than nozzle size.
1.20 @ 160psi is 1.52 gph.

gchevm

Net stack is 353. I forget excess air at moment. If these trio’s have a Riello then they are positive. All numbers I am using or tuning to are provided by the factory rep. But I do agree this is over fired at this point as far as I’m concerned. I do have call into rep to review video and advise or stop at location. Will update

gchevm

Sorry….model PROP3 By FW Webb Purepro Trio

EBEBRATT-Ed

@gchevm

Something seems off here. The PROP3 only has a max input of 105,000 btu/hour which is .75gph achieved with a .60 70B with a pump pressure of 160. That's what the boiler manual attached says. Are you sure it is a PROP3?

STEVEusaPA

A prop3, afg, has a .60x70B nozzle, 160 psi, +.02 over fire draft.


Page 19
https://fwwebbimage.fwwebb.com/ProductInfo/FWWebbP3P8Boiler10517Manual.pdf

Edit: @EBEBRATT-Ed beat me to it. But note positive over fire draft.

HVACNUT

I don't see anything listed at 1.20 GPH.

Steamhead

This is the same as the Solaia boilers. Here's what happened when we found one over-fired not long ago:

https://forum.heatinghelp.com/discussion/164295/over-fired-3-pass-boiler

gchevm

I don’t know how I missed it and why they specd and sent me at burner but that’s the info I need. This is definitely over fired and a .6 makes sense but I believe to low for this home. May need slight step up. Going to take this to rep and FWWebb commercial sales designer. Thanks again so much will update

Robert O'Brien

STEVEusaPA said:

I think it’s too much combustion air. What was your excess air number and net stack temp?
What’s the model number?
Are you sure that model wants -.02 over the fire? Triple passes usually want zero to positive, and some want zero at the breech or test port.
Draft and excess air will affect your stack temperature more than nozzle size.
1.20 @ 160psi is 1.52 gph.

Where did you get this app? Looks great!

gchevm

Already looked at charts and monitored fuel usage. Net stack is 353. I forget excess air at moment. If these trio’s have a Riello then they are positive. All numbers I am using or tuning to are provided by the factory rep. But I do agree this is over fired at this point as far as I’m concerned. I do have call into rep to review video and advise or stop at location. Will update and thank you

STEVEusaPA

Robert O'Brien said:

Where did you get this app? Looks great!

I made it myself. It's made with the same database program I did the Heat Loss app.
The program (FileMaker) is free on IOS devices (iPad, iPhone). But to use it on a desktop you'd have to buy the database program (or use a trial version).
Either way I could send you, or anyone the file. I offered up this on here Alan's FB page a few times, almost no takers..






Adding on a circulator sizing component in my spare time. Just a lot of data entry to build all pipe types/sizing.

Steamhead

gchevm said:

I don’t know how I missed it and why they specd and sent me at burner but that’s the info I need. This is definitely over fired and a .6 makes sense but I believe to low for this home. May need slight step up. Going to take this to rep and FWWebb commercial sales designer. Thanks again so much will update

Did you do a heat-loss calculation on the house?

Robert O'Brien

STEVEusaPA said:

Where did you get this app? Looks great!

I made it myself. It's made with the same database program I did the Heat Loss app. The program (FileMaker) is free on IOS devices (iPad, iPhone). But to use it on a desktop you'd have to buy the database program (or use a trial version). Either way I could send you, or anyone the file. I offered up this on here Alan's FB page a few times, almost no takers.. Adding on a circulator sizing component in my spare time. Just a lot of data entry to build all pipe types/sizing.

I’d love to have it!!

STEVEusaPA

I’ll send it over to you tomorrow on FB messenger.
Edit: Sent...