Honeywell RTHL2510C Owner's Manual page 6

Alternate Wiring (Conventional Systems)
If labels do not match letters on the thermostat, check the chart below and
connect to terminal as shown here (see notes, below).
If wires will be connected to both R and Rc terminals, remove metal
jumper.
Do not use C or X. Wrap bare end of wire with electrical tape.
If you have a heat pump without auxiliary/backup heat connect O or B,
not both. If you do not have a heat pump, do not connect B. Wrap bare
end of wire with electrical tape.
Place a jumper (piece of wire) between Y and W if you are using a heat
pump without auxiliary/backup heat.
Alternate Wiring (Heat Pump)
If labels do not match letters on thermostat, see page 7.
B O G Y
B O G
6
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4 4
R
Y W/ R Rc
AUX
M32727
Rc
M32726