I have a honeywell lr69071 thermostat with e, c, w2 ,r, g, o, y... my new honeywell rth3100c has pins e, aux,r ,g, o, y, l, c(it says c is optional with batteries?. it is for a heat pump with aux... can anywone tell me what goes on the l wire... I think the w2 wire goes on the aux pin.

Thank you

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