Houston, we have AC!
Actually, we’ve had it since Monday night, but with ball games, removing the window airconditioner that I was using to keep the house tolerable and assorted other obligations, I’m just now able to blog at all.
The service guy was victimized by a typo in the installation instructions–they reversed the hot and ground lugs on the wiring diagram, thereby creating a dead short. He blew 3 transformers before wiring a fuse in line with the transformer to keep it from happening again. So I benefit not only from the new and improved board (which is also fused) but the fuse for the transformer as well.
And I now know a lot more about how HVAC works. Expensive education, but at least I got a bonus out of the deal.