pressure vs. natural draft boiler

Dave_60

Can anyone give mr a definate answer cwhy a model 78 or 80 series weil mclain boiler can't be natural draft, weil mclAIN CAN'T ANSWER. Reason being, the commercial customer would like a quiter burner installed on these 2 boilers, both fire at 2.00gph. each, want to get rid of the carlin crd 201 and replace with generic becketts.

[Deleted User]

Oops.

The 2 GPH nozzle doesn't compute. 2.00 nozzle @ 150 P/P would be OK for the 378 & 380 w/ the specified EZ-3HP. The 201 doesn't come into the picture until the 478 & 480. Looks like someone tried to downfire the 201. Guaranteed noisy @ that input. Which boiler(s) are you asking about?

Dave_60

weil mclain

Ron,
Correct, weil mclain tried to shove a 201 at me. Recently, on a 378 steam, the cust. was upset with the beckett cf50 it had on it. + 1 overfire draft 06 at breeching. I pulled burner and installed a afg on it and opened up damper on the boiler. seems to run fine, 0 smoke, 11.5 co2 I'm waiting on the carlin hp for the 380 i installed this wk.The burner was not in stock,SOOOO, the dealer shipped me the 201. Can you believe weil mclain support told my dealer that the 201crd. would fit, no problem , on this boiler? The crd201 lowest fir rate is 2.5 gph.anyway, any clue as to why I can't run these nat. draft? Dave

RonWHC

The 78 was

approved for NATURAL draft firing, for oil, with the damper removed. Even then it was tricky. The draft loss thru the boiler is .12" WC. Hope you checked the over fire on the Beckett. My book says the AFG comes up short. That 13 1/2" combustion area is mighty short too.

The 380 is a different animal. Not approved for NATURAL. Weil wants +.28" WC in the chamber. They don't list the draft loss, but it has to be considerably higher than the 378. I would be mighty careful opening the damper on this one and trying an under aired burner. Don't see how you could keep the fire off the rear wall @ anything near capacity. If you want to experiment w/ a Beckett, I would take a look @ the CF375. Don't have any specs about input vs. pressure, but it has a range closer to the mark than an AFG. Neither the AFG or the CF375 is approved on these boilers.

Yep. I believe anything I hear about Weil, until someone proves me wrong. They've chased away a lot of good folks in the last 2 years. The rest hide behind voice mail. They used to care about their customers and their customer's customers. Now, if your wholesaler is not up-to-snuff, look out!

BTW, if you are installing many of the 80 Series, take a look @ the venting table on Page 31 of the I&O Manual. Very interesting & it does make a difference. Good luck.

Dave_60

Thanks, Ron, for your help, I'm going to invertigate this furthur, of course right now I'm between a rock and a hard place untill the hd comes in. The 378 has a, if I can remember, a f-12 head on it and I was -02 overfire. Like you said tthe 380 is indeed different, I prob. won't use anymore 380's on larger jobs, I believe our company will continue to use the larger burnham's, they seem to be more robust, and I still like push nipples. I will keep you appraised. Again, Thanks.