Honeywell RTH221 オーナーマニュアル

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.

M32734

4

4

7  Install Batteries

Install two AAA alkaline batteries.

Back of thermostat

RTHXXXX

M32707