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Counterflow

Is there a place on heatinghelp.com that lists EDR's. I left my books at work and I'm trying to make sure a unit is not oversized.

I've got a customer with a counterflow system. They have a new 4 section Smith 8 that short cylcles like crazy. Judging by the size of the house and the number and size of the radiators, I think it's oversized. Someone replaced the presuretrol with a vaportrol to get the pressure down, because the water was dropping in the glass, presumably working it's way back up the equalizer.

Thought I'd start with the size issue first.
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