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Hello Jim, i see your not ready to respond but here is my answer, if you need to replace your existing t-stat you do not need to use the same one, you can get any heat pump equipped with option 3 heat one cool to match the one you have.
Simple to instal, just hook up the same wire to the same terminals. then follow installers configuration instruction.
Hope this answers your question.
Wrong t-stat Jim, not for heat pump
Get a Honeywell or a White rogers, Emerson, with all the right terminal.
By the way L not necessary, it is used to transmit and error code incase the heat pump breaks down, OB is reversing valve, for heat or cool. C supplies power to t-stat instead of batteries.