Honeywell RTH2510 Quick Installation Manual page 12

Quick Installation Guide
Set Heat Pump Reversing Valve
Set jumper JP2, on the back of the thermostat, if you
have a heat pump.
Leave the jumper in this factory-set
O
position if you have connected O wire to
the O/B terminal.
Place the jumper to this position if you
B
have connected B wire to the O/B terminal.
Incorrect jumper setting: The heat pump operation
will be reversed, i.e., it will cool in Heat mode and will
heat in Cool mode.
10
10.
JP2