Paul:
I would raise my pot temperature.  490 to 500 F is a good temp.  to be at
for the solder pot temperature.

Also check your topside board temperature.  Rule of thumb is 230 F on
topside.  If you have large components on the topside preheating will be
critical.

I looked at your drawing and it looks like you are not getting the heat you
need to solder.  Seeing the pot temp, that low could cause the problem.

Ron Hollandsworth
ITT

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