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This pan lies with about 1/2" of water. The drain connection is about 1/2" from the bottom so the water never drains completely.
Twice now the drain line has plugged with the rust sludge, which trips the high level switch.
It doesn't seem like a very good design, and the A coil bracket is rusting away.
Bob "hot rod" Rohr
trainer for Caleffi NA
The magic is in hydronics, and hydronics is in me