Honeywell RTH2300 series User manual

Operating
Manual
RTH2300/RTH221 Series
Programmable Thermostat
69-2727EF-03

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® U.S. Registered Trademark. Patents pending.
Copyright © 2013 Honeywell International Inc. All rights reserved.
This manual covers the following models:
RTH2300
RTH221
CAUTION: EQUIPMENT DAMAGE HAZARD.
To prevent possible compressor damage, do not operate cooling system when outdoor
temperature is below 50°F (10°C).

RTH2300/RTH221
1 69-2727EF—03
About your new thermostat
Thermostat features....................................2
Thermostat is preset, ready to go...............3
Quick reference to controls.........................4
Quick reference to display...........................5
Programming & Operation
Set time and day.........................................6
Select system setting..................................7
Select fan setting ........................................8
Using program schedules .....................9–10
Adjust program schedule (RTH2300) .......11
Adjust program schedule (RTH221) .........12
Program schedule overrides ............... 13–14
Compressor protection..............................15
Change Filter (RTH2300)..........................16
Appendices
Battery replacement..................................17
Customer assistance ................................18
In case of difficulty .............................. 19–20
Limited warranty........................................21
This thermostat is ready to go!
Your new thermostat is pre-programmed
and ready to go.
See page 10 to check settings.
Table of contents

About your new thermostat
Your new Honeywell thermostat has been designed to give you many years of reliable
service and easy-to-use, push-button climate control.
Features
• BacklitdisplayonRTH2300
• Displaysambient(measured)temperatureatalltimes
• One-touchaccesstosetpointtemperature
• Presetprogramsettings
• Temporaryandpermanentoverrideofschedule
• Built-incompressorprotection
Operating Manual
2

RTH2300/RTH221
3 69-2727EF—03
This thermostat is ready to go!
Your new thermostat is pre-programmed and ready to go. All you have to do is set the
time and day. Then check the settings below and change if needed:
1. Set time and day (required for proper operation)..............................See page 6
2. Select system setting: Preset to Off ....................................To change, see page 7
3. Select fan setting: Preset to Auto .......................................To change, see page 8
4. Program schedules: Preset to energy-saving levels
while you’re at work or asleep........................................To change, see pages 9-12
ONE-TOUCH TEMP CONTROL: You can override the program schedule at any time, and
manually adjust the temperature (see pages 13-14).

Operating Manual
69-2727EF—03 4
M33612
Heat Off Cool Auto On
Fan
Heat Off Cool Auto On
Fan
Set
Hold
Run
Quick reference to controls
Temperature
adjustment (see
page 13-14)
Screen Lit for 12 seconds when you press any button.
Fan Switch (see page 8)
On: Fan runs continuously.
Auto: Fan runs only when heating or cooling system
is on.
Set: Press to set time/
day/schedule.
Hold: Press to override
programmed tempera-
ture control.
Run: Press to resume
program schedule.
System switch (see page 7)
• Heat: Heating system control.
• Off: All systems off.
• Cool: Cooling system control.

RTH2300/RTH221
5 69-2727EF—03
M32701
We
Lo
Batt
Wake
Set
am
Heat
75
On
6:30
Quick reference to display screen
Low battery warning
(see page 17)
Setpoint indicator
Appears when the
setpoint temperature
is displayed.
Temperature
The ambient (measured)
temperature is normally
displayed. To view the
setpoint temperature,
presstheUporDown
button once. The setpoint
temperature will appear for
five seconds.
System status
Cool on: Cooling system is on.
Heat on: Heating system is on.
WhenCoolOnisflashing,compressorprotectionisengaged(seepage15).
Current day/time
(see page 6)
Current program period
Wake/Leave/Return/Sleep
(see pages 9-10)

Operating Manual
69-2727EF—03 6
Set
Hold
Run
Set Time
am
6:30
M33787
Set Day
We
Set
Hold
Run
M33788
Set the time and day
1. Press the SET button, then press s or t
to set the clock time.
2. Press the SET button, then press s or t
to select the day of the week.
3. Press RUN to save & exit.
Note: If the clock flashes, the thermostat will follow
your settings for the Monday “Wake” time period
until you reset the time and day.
Press SET, then adjust time.
Press SET, then select current day.

RTH2300/RTH221
7 69-2727EF—03
M33612
Heat Off Cool Auto On
Fan
Heat Off Cool Auto On
Fan
Set
Hold
Run
Select the system setting
The SYSTEM switch can be set to control
your heating or cooling system, depending
on the season.
• Cool: Cooling system control.
• Off: All systems are off.
• Heat: Heating system control.
Set SYSTEM switch to control the
heating or cooling system.
CAUTION: EQUIPMENT DAMAGE
HAZARD. To prevent possible
compressor damage, do not operate
cooling system when outdoor
temperature is below 50°F (10°C).

Operating Manual
69-2727EF—03 8
Select the fan setting
Set the FAN switch to Auto or On.
In “Auto” mode (the most commonly used
setting), the fan runs only when the heating
or cooling system is on.
Ifsetto“On,”thefanrunscontinuously.
Set FAN switch to choose whether the fan
runs continuously or only as needed.
M33612
Heat Off Cool Auto On
Fan
Heat Off Cool Auto On
Fan
Set
Hold
Run