Honeywell RTH221B1021 User Manual

7
7 Install Batteries
Install two AAA alkaline batteries.
Back of thermostat
RTHXXXX
M32707
Alternate wiring (for heat pumps with auxiliary or backup heat only)
If labels do not match letters on the thermostat, check the chart below and
connect to terminal as shown here (see notes, below).
Leave metal jumper in place, connecting R & Rc terminals.
If your old thermostat had both V and VR wires, stop now and contact a
qualified contractor for help.
If your old thermostat had separate O and B wires, wrap the B wire in
electrical tape and do not connect.
If your old thermostat had Y1, W1 and W2 wires, stop now and contact a
qualified contractor for help.
Do not use C or X wire. Do not use B wire if you already have O wire.
Wrap bare end of wire with electrical tape.
Do not use L wire. Wrap bare end of wire with electrical tape.
If your old thermostat had E and Aux wires (or alternate wires), connect
both wires to Aux terminal.
5
6
7
M32728
2
7
4
AUX
W
W1
W2
F
B
OG
H
C
RC
V
VR
B
X
R
M
Y1
Y
E
7
X
X2
L
F
6
5
3
2
1
B O G Y
W/
AUX
NOT
USED
R Rc

Honeywell RTH221B1021 Specifications

General

Type	Non-programmable
Display	Digital
Power Source	Battery
Temperature Control Range	40°F to 90°F (4°C to 32°C)
Stages	1 Heat/1 Cool
Voltage	24V
Backlight	No
Compatibility	Single-stage heating and cooling systems