OK, the "O" must reportedly swithces it to heat pump (which I don't
have), the B switches it back to AC, the L is for some kind of auxiliary
(unused in my case?), the W is for "who knows what" :). So I'll connect
the 3 R's (from the AC, the furnace, ...
Awesome! I think my iComfort gave out and I'm trying to replace it with
a Nest. See photos; my iComfort has an Interface unit between it and the
Lennox AC and the old non-Lennox (non-dual-stage) furnace/fan. The
Interface has 4 wires coming in from t...
