[Dr D]

Labman bailed me out before, with another thermostat. This one seems more sophisticated. Hookup for a single stage HP. Here is how old (HW Programable)TS was wired:
G-G; R-R;Y-Y;W-W;O-O. New TS has following terminals: G; W O/B;Y;R;Rc (jumpered to R). My problem is the W O/B terminal. It seems to indicate W or O at that connection, not W and O. If I hook the O (reversing valve) to that one, where do I put the W wire? This new TS can be programed for O wire (cooling changeover valve) or B wire (heating changeover valve).The Y and W wires from the HP are joined to the Y and W leading down to the TS. My other TS in the garage has the W & Y terminals jumpered and works fine. Can I just hook up Y wire (which is already joined to the W wire) to the Y terminal? Poor Honeywell instructions keep Labman, etal busy.