Electronics Forum | Thu Jul 24 10:49:12 EDT 2008 | slthomas
100 CFM at each exhaust if you're using room air, 25 CFM/ea if you're using nitrogen (according to my manual...never used nitrogen myself) per their specified delivery rates.
Electronics Forum | Wed Jul 23 18:25:12 EDT 2008 | shanenaturalpoint
I just purchased a used Heller 1500 reflow oven for an SMT line that I am ting up. Looking for the CFM requirements for my exhaust venting. Does anyone out there have any information on what the minimum requirements are for pumping this exhaust out
Electronics Forum | Wed Aug 06 23:32:19 EDT 2008 | darby
It SHOULD be written on the machine. I have had/have 1500 Hellers that range from 60cfm to 500cfm Check the fine smtnet archives. http://www.smtnet.com/forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=8859&#Message35065
Electronics Forum | Tue Feb 12 14:18:48 EST 2008 | pjc
Without forced exhaust your oven will struggle to regulate zone temps, especially if a cooler one next to a hotter one. There should be no damage to the oven, just working harder to regulate itself.
Electronics Forum | Thu Feb 07 14:29:02 EST 2008 | jdumont
Bi monthly?!!? What are your exhausts getting clogged with? You have that much dust in the air that cleaning every two weeks is necessary?
Electronics Forum | Mon Feb 11 17:30:59 EST 2008 | blnorman
The solder problems that were created caused overcompensation. Plus our PM schedules could be monthly, could be yearly depending on the maintenance crew for a particular line.
Electronics Forum | Mon Feb 04 09:42:57 EST 2008 | tonyamenson
I just discovered my reflow oven exhaust had no suction and I'm fixing it now. What I want to know is what happened to my process. FYI. The exhaust from my other oven was getting kicked back into the faulty oven because of this loss of suction. The
Electronics Forum | Wed Feb 06 17:24:04 EST 2008 | blnorman
We had a vent block up not too long ago ourselves. Saw multiple solderjoints, especially on fine pitch micros, that looked like they had alligator toes. We solder bump, so it was obvious that area didn't get hot enough to liquify the solder and hav
Electronics Forum | Mon Feb 04 10:30:10 EST 2008 | tonyamenson
Well the profiler IS out for calibration so I can't use it. However, what piqued my curiosity is your statement concerning uneven heating. On the product we were running we had several non-liquidous solderjoints where as the rest of the joints looke
Electronics Forum | Mon Feb 04 10:17:39 EST 2008 | slthomas
Your oven no doubt compensated by reducing energy to your heaters so it might not be as bad as you think. I'd be more concerned about even heating than over heating. My opinion is that an out of calibration profiler result is better than no result
.gif)
