Honeywell RTH221 Series User manual

69-2606ES-01
Quick Installation Guide
RTH2300/RTH221 Series
Programmable Thermostat

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.

1 69-2606ES—01
M28097
1Turn Off Power to Heating/
Cooling System

69-2606ES—01 2
Is there a sealed tube containing
mercury? If so, see back cover
for proper disposal instructions.
M28099
Old thermostat
Cover
Remove old thermostat but leave wallplate with
wires attached.
Remove Old Thermostat
Do not remove
wallplate yet
2

3 69-2606ES—01
Label Wires with Tags
3
Label the wires using the supplied wire labels as you
disconnect them.
Wire Labels
M28100
M28093

69-2606ES—01 4
M32731
TO REMOVE WALLPLATE
PULL HERE
Separate Wallplate from
New Thermostat
4
Remove wallplate from the new thermostat and mount
onto wall.
Wallplate

5 69-2606ES—01
Mount the new wallplate using the included screws
and anchors.
5Mount Wallplate
Drill 3/16-in. holes for drywall
Drill 3/32-in. holes for plaster
W/
Aux
Not
Used
M32714

69-2606ES—01 6
Connect Wires
6
M32732
SCREW
INSERT WIRES
AND TIGHTEN
SCREWS
WIRE
HOLE
LABELED
WIRES
W
G
R
Not
Used
W
Y
Simply match wire labels.
Remove metal jumper if you have both Rand Rc wires.
Labels don’t match? See page 20.
We are here to help.
Call 1-800-468-1502 for wiring assistance.

7 69-2606ES—01
RTHXXXX
M32707
Install two AAA alkaline batteries.
Back of thermostat
7Install Batteries

69-2606ES—01 8
Move the switch to the proper setting:
Gas or Oil: For gas or oil heating systems, leave the fan
operation switch in this factory-set position (for systems
that control the fan in a call for heat).
Electric or Heat Pump: Change the switch to this setting
for heat pump or electric heat systems. (This setting is for
systems that allow the thermostat to control the fan in a
call for heat, if a fan wire is connected to the Gterminal.)
8Set fan operation switch
RTHXXXX
M32716
GAS OR OIL
ELECTRIC OR HEAT PUMP
GAS OR OIL
ELECTRIC OR HEAT PUMP