Honeywell RTH221 Series User Manual

69-2606ES—01 ii
Identify System Type
This thermostat is compatible with the following systems:
Gas, oil or electric furnace
Central air conditioner
Hot water system with or without pump
Millivolt system
Central heating and cooling system
Heat pump without auxiliary/backup heat
Do you need assistance?
We are here to help.
Call 1-800-468-1502 for wiring
assistance before returning
the thermostat to the store.
This thermostat cannot be used on heat pumps or on
multistage systems.

Honeywell RTH221 Series Specifications

General

Stages	1 Heat/1 Cool
Voltage	24V
Temperature Range	40°F to 90°F (4°C to 32°C)
Backlight	No
Display	Digital
Power Source	Battery
Temperature Control	Manual
Compatibility	Gas, Oil, Electric
Type	Non-Programmable Thermostat
Program Periods	Not Applicable