Honeywell RTH2300 series User manual

69-2728ES-01
Quick Installation Guide
RTH2300/RTH221 Series
Programmable Thermostat

69-2728ES—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 69-2728ES—01
1Turn Off Power to Heating/
Cooling System
or
OFF

69-2728ES—01 2
Is there a sealed tube containing
mercury? If so, see back cover for
proper disposal instructions.
50 60 70 80 F
OFF
AUTOEM. HEAT
EM. HEATAUX. HEAT
50 60 70 80
M33835
Old thermostat
Cover
Remove old thermostat but leave wallplate with
wires attached.
Remove Old Thermostat
Do not remove
wallplate yet
2

3 69-2728ES—01
Label Wires with Tags
3
Label the wires using the supplied wire labels as you
disconnect them.
Wire Labels
M28100
M33763

69-2728ES—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 69-2728ES—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

69-2728ES—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 69-2728ES—01
RTHXXXX
M32707
Install two AAA alkaline batteries.
Back of thermostat
7Install Batteries

69-2728ES—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

9 69-2728ES—01
W/
Aux
Not
Used
Heat Off Cool Auto On
Fan
M33784
Heat Off Cool Auto On
Fan
Heat Off Cool
Auto On
Fan
Set
Hold
Run
Install thermostat onto the wallplate on the wall.
9Install Thermostat onto Wallplate

69-2728ES—01 10
Turn the power back on to the heating/cooling system.
10 Turn Power Back On
or
ON

11 69-2728ES—01
If your system type is:
q Single Stage Heat and Cool
q Heat Only or Cool Only
Congratulations, you’re done!
If your system type is:
q Heat Pump* with Backup Heat
Continue with advanced installation
on next page to match your thermostat to your system
type.
*Heat Pump—an air conditioner that provides cooling in the
summer, and also runs in reverse in the winter to provide
heating.
If you are not sure of your system type or if you have
other questions, call us toll-free at 1-800-468-1502.
This thermostat works on 24 volt or 750 mV systems. It will
NOT work on multi-stage conventional systems or 120/240
Volt systems.
11 If your system type is...

Advanced Installation
Enter system setup..............................................................13
Changing settings................................................................14
Heating cycle rate................................................................15
Temperature display ............................................................16
Compressor protection ........................................................17
Clock display .......................................................................18
Restore program schedule default ......................................20
Alternate wiring....................................................................21
Troubleshooting ...................................................................22
Customer assistance...........................................................23
Limited warranty ..................................................................24

RTH2300/RTH221
13 69-2728ES—01
SETUP WIRING ASSISTANCE TROUBLESHOOTING
Enter System Setup
System setup
To enter system setup, press and hold both the s and
t buttons until the display changes (approximately 5
seconds).
M33785
Heat Off Cool Auto On
Fan
Heat Off Cool
Auto On
Fan
Set
Hold
Run

Advanced Installation Guide
69-2728ES—01 14
SETUPWIRINGASSISTANCETROUBLESHOOTING
5
5
M33786
Set
Hold
Run
System setup
Change Function Change Setting
See pages 15–19 to change Function Settings.
Changing Settings
Function Setting
1. Press the sor tbutton to change the setting.
2. Press the s and tbuttons simultaneously for one
second to advance to the next function.
3. Press the Run button to exit and save settings.
NOTE: If you do not press any button for 60 seconds while
you are in the setup menu, the thermostat automatically
saves any changes made and exits the menu.

RTH2300/RTH221
15 69-2728ES—01
About your new thermostat
SETUP WIRING ASSISTANCE TROUBLESHOOTING
55
M32720
System setup
Press the sor t button to select your heating system
and optimize its operation.
Function 5: Heating cycle rate
5Gas or oil furnace: Use this setting if you have a
standard gas or oil furnace that is less than 90%
efficient.
6Electric furnace: Use this setting if you have any type
of electric heating system.
3Hot water or high-efficiency furnace: Use this
setting if you have a hot water system or a gas furnace
of greater than 90% efficiency.
2Gas/oil steam or gravity system: Use this setting if
you have a steam or gravity heat system.
Press to
change
setting.
When finished,
press sand t
to advance to the
next function.
M33591
AND
OR

Advanced Installation Guide
69-2728ES—01 16
SETUPWIRINGASSISTANCETROUBLESHOOTING
System setup
Function 14: Temperature display
0Fahrenheit temperature display (°F)
1Celsius temperature display (°C)
Press the sor t button to select Fahrenheit or Celsius
temperature display.
14 0
M32722
Press to
change
setting.
When finished,
press sand t
to advance to the
next function.
M33591
AND
OR

RTH2300/RTH221
17 69-2728ES—01
SETUP WIRING ASSISTANCE TROUBLESHOOTING
System setup
Function 15: Compressor Protection
1On
0Off
Press the sor t button to select Compressor Protection
settings.
Compressor Protection: This feature forces the com-
pressor to wait approximately 5 minutes before restarting,
to prevent equipment damage. During the wait time, the
message “Cool On” or “Heat On” is displayed on screen.
15 1
M32723
Press to
change
setting.
When finished,
press sand t
to advance to the
next function.
M33591
AND
OR

Advanced Installation Guide
69-2728ES—01 18
SETUPWIRINGASSISTANCETROUBLESHOOTING
System setup
Function 20: Clock Display
012-hour display
124-hour display
Press the sor t button to select clock display.
Press to
change
setting.
When finished,
press sand t
to advance to the
next function.
M33591
AND
OR
20 0
M32724