Honeywell RTH221B1047 User manual

Owner’s Manual
RTH221B1047
RTH2300B1020
Read before installing
For help please visit
resideo.com
RTH2300/RTH221
Series
Programmable
Thermostat
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 with
backup heat or on multistage systems.
Input: 2 x AAA batteries (1.5V each)

2
NOTICE: To avoid possible compressor damage, do not run air
conditioner if the outside temperature drops below 50°F (10°C).
ATTENTION: MERCURY RECYCLING
NOTICE
This product does not contain mercury. However,
this product may replace a product that contains
mercury. Mercury and products containing
mercury should not be discarded in household
trash.
For more information on how and where to
properly recycle a thermostat containing
mercury in the United States, please refer to the
Thermostat Recycling Corporation at
www.thermostat-recycle.org.
For mercury thermostat recycling in Canada,
please refer to Switch the Stat at
www.switchthestat.ca
NO MERCUR
Y
NE PAS JETER
LE MERCURE
Hg
RTHXXXX
M32707
Customer assistance
For assistance with this product, please visit
resideo.com.
Or call Resideo Customer Care toll-free at
18004681502.
To save time, please note your model number
and date code before calling.
Pull at bottom to remove thermostat from
wallplate.
Turn thermostat over to find model number
and date code.

3
Installation
Installation....................................................... 3
Advanced Installation ................................8
About your new thermostat
Controls and Home screen
quick reference........................................... 10
Preset energy-saving schedules.......11
Programming and operation
Setting the clock........................................ 11
Adjusting program schedules.............12
Overriding schedules temporarily ....13
Overriding schedules permanently ... 13
Compressor protection........................... 14
Replace batteries.......................................14
Appendices
Troubleshooting.........................................15
Limited warranty........................................ 16
Table of contents
1 Turn Off Power to Heating/Cooling System
or
M31535
Circuit breaker
box Heating/cooling system power switch

4
Do not remove wallplate yet
3 Label Wires with Tags
Label the wires using the supplied wire labels as you disconnect them.
Wire Labels
www.honeywellhome.com
C
C
MCR33823
Terminal
designation
If you have an older thermostat with
a sealed mercury tube, turn to page
2 for proper disposal instructions.
Terminal designation
C
C
MCR31537
2 Remove Old Thermostat
Remove old thermostat but leave wallplate with wires attached.
4 Separate Wallplate from New Thermostat
Remove wallplate from the new thermostat and mount onto wall.
M32731
TO REMOVE WALLPLATE
PULL HERE
Wallplate

5
5 Mount Wallplate
Mount the new wallplate using the included screws and anchors.
If your box contains red anchors, drill 7/32” (5.6 mm) holes. If your box
contains yellow anchors, drill 3/16” (4.8 mm) holes.
6 Connect Wires
Simply match wire labels.
If labels do not match letters on the thermostat, check “Alternate Wiring” on
page 6 and connect to terminal as shown (see notes, below).
Thermostat does not work on Heat Pumps with auxiliary/backup heat.
We are here to help. Call 18004681502 for wiring assistance.
W/
Aux
Not
Used
M32714
Remove metal
jumper if you
have both Rand
Rc wires.
M32732
SCREW
INSERT WIRES
AND TIGHTEN
SCREWS
WIRE
HOLE
LABELED
WIRES
W
G
R
Not
Used
W
Y

6
Alternate Wiring
If wires will be connected to both Rand Rc terminals, remove metal
jumper.
Do not use Cor X. Wrap bare end of wire with electrical tape.
If you have a heat pump without auxiliary/backup heat connect Oor B,
not both. If you do not have a heat pump, do not connect B. Wrap bare
end of wire with electrical tape.
Place a jumper (piece of wire) between Yand Wif you are using a heat
pump without auxiliary/backup heat.
B O G Y
WNOT
USED
R Rc
M32734
44
7 Install Batteries
Install two AAA alkaline batteries.
Back of thermostat
RTHXXXX
M32707

7
8 Set fan operation switch
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 G
terminal.)
9 Install Thermostat
onto Wallplate
Install thermostat onto the wallplate
on the wall.
RTHXXXX
M32716
GAS OR OIL
ELECTRIC OR HEAT PUMP
GAS OR OIL
ELECTRIC OR HEAT PUMP
10 Turn Power Back On
Turn the power back on to the
heating/cooling system.
W/
Aux
Not
Used
Heat Off Cool Auto On
Fan
M32705
M31544
or
Circuit breaker
box Heating/cooling system power switch

8
11 If your system type is...
If your system type is:
qSingle Stage Heat and Cool
qHeat Only or Cool Only
Congratulations, you’re done!
If your system type is:
qHeat pump
qHigh efficiency furnace
qHot water
qElectric furnace
qGas/oil steam
qGravity system
Continue with Advanced Installation to match your thermostat to your system
type.
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.
Advanced Installation
Enter System Setup
To enter system setup, press and hold both
the sand tbuttons until the display
changes (approximately 5 seconds).
Changing Settings
1. Press the sor tbutton to change
the setting.
2. Press the sand tbuttons
simultaneously for one second to
advance to the next function.
3. Press the RUN button to exit and save
settings.
M32713
Heat Off Cool Auto On
Fan
Function
Setting
55
M32779

9
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.
Function
Description
Press the sor tbutton to Setting
5 select your heating system and
optimize its operation
5 Gas or oil furnace: Use this setting if you have a standard gas or
oil furnace that is less than 90% efficient.
6 Electric furnace: Use this setting if you have any type of electric
heating system.
3 Heat pump, hot water or high-efficiency furnace:
Use this setting if you have a hot water system or a gas furnace of
greater than 90% efficiency.
2 Gas/oil steam or gravity system: Use this setting if you
have a steam or gravity heat system.
14 select Fahrenheit or Celsius
temperature display
0 Fahrenheit temperature display (°F)
1 Celsius temperature display (°C)
15* select Compressor Protection settings 1 On
0 Off
20 select clock display 012-hour display
124-hour display
40
(RTH2300
only)
restore program schedule to default
settings
0 Off
1 On: Program schedule default settings are listed on page 11.
* Compressor Protection: This feature forces the compressor 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.
About your new thermostat
Your new Resideo thermostat has been designed to give you many years of
reliable service and easy-to-use, push-button climate control.
• 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

10
Thermostat controls
M32700
Heat Off Cool Auto On
Fan
Set: Press to
set time/day/
schedule.
Hold: Press
to override
programmed
temperature
control.
Run: Press to
resume program
schedule.
Temperature
adjustment
Press the up or
down buttons
until you reach
the desired
temperature.
NOTE: Make sure
the SYSTEM switch
is set to the system
you want to control
(Heat or Cool).
Fan Switch is used to control your fan.
In “Auto” mode, the fan runs only when
the heating or cooling system is on.
If set to “On,” the fan runs continuously.
System Switch is used to control
your heating or cooling system.
• Heat: Heating system control.
• Off: All systems off.
• Cool: Cooling system control.
Display screen
M32701
We
Lo
Batt
Wake
Set
am
Heat
75
On
6:30
Low battery warning
(see page 14)
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 14).
Current day/time
(see page 11)
Current program period
Wake/Leave/Return/Sleep
(see pages 1113)

11
Set Time
am
6:30
M32702
Set Day
We
M32703
Set the time and day
1. Press the SET button, then press
sor tto set the clock time.
2. Press the SET button, then press
sor tto 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.
Program Schedule
You can program four time periods each day, with different settings for
weekdays and weekends. We recommend the pre-set settings (shown in the
table below), since they can reduce your heating/cooling expenses.
Wake - Set to the time you
awaken and the temperature you
want during the morning, until
you leave for the day.
Leave - Set to the time you
leave home and the temperature
you want while you are away
(usually an energy-saving level).
Return - Set to the time
you return home and the
temperature you want during the
evening, until bedtime.
Sleep - Set to the time you go to bed and the temperature you want overnight
(usually an energy-saving level).
NOTE: Leave and Return periods can be canceled on weekends.
Heat Cool
Wake
(6:00 am) 70 °78 °
Leave
(8:00 am) 62 °85 °
Return
(6:00 pm) 70 °78 °
Sleep
(10:00 pm) 62 °82 °

12
To adjust program schedules (RTH2300)
Mo Tu We Th Fr
Wake
Set Schedule
Set
am
75
6:30
M32706
1. Press SET until Set Schedule is
displayed.
2. Press sor tto set your weekday
Wake time (MoFr), then press
SET.
3. Press sor tto set the
temperature for this time period,
then press SET.
4. Set time and temperature for the
next time period (Leave). Repeat
steps 2 and 3 for each weekday
time period.
5. Press SET to set weekend time
periods (Sa & Su), then press RUN
to save & exit.
NOTE: Make sure the thermostat
is set to the system you want to
program (Heat or Cool).
Mo Tu We Th Fr Sa Su
Wake
Set Schedule
Set
am
75
6:30
M32824
To adjust program schedules (RTH221)
1. Press SET until Set Schedule is
displayed.
2. Press sor tto set your Wake
time (MoSu), then press SET.
3. Press sor tto set the
temperature for this time period,
then press SET.
4. Set time and temperature for the
next time period (Leave). Repeat
steps 2 and 3 for each time period.
5. Press RUN to save & exit.
NOTE: Make sure the thermostat
is set to the system you want to
program (Heat or Cool).

13
Temporary
Wake
Set
am
70
6:30
M32708
Set
am
75
6:30
M32709
Program schedule override (temporary)
Press sor tto immediately adjust
the temperature. This will temporarily
override the temperature setting for
the current time period.
“Temporary” will appear on the display
and the current program period will
flash.
The new temperature will be
maintained only until the next
programmed time period begins (see
page 11).
To cancel the temporary setting at any
time, press RUN.
NOTE: Make sure the thermostat is
set to the system you want to control
(heat or cool).
Hold
Set
am
70
6:30
M32710
Set
am
75
6:30
M32709
Program schedule override (permanent)
Press HOLD to permanently adjust
the temperature. This will override
the temperature settings for all time
periods.
The “Hold” feature turns off the
program schedule and allows you to
adjust the thermostat manually, as
needed.
Whatever temperature you set will
be maintained 24 hours a day, until
you manually change it, or press
RUN to cancel “Hold” and resume the
program schedule.
NOTE: Make sure the thermostat is
set to the system you want to control
(heat or cool).

14
Built-in compressor protection
This feature helps prevent damage to
the compressor in your air conditioning
or heat pump system.
Damage can occur if the compressor is
restarted too soon after shutdown. This
feature forces the compressor to wait 5
minutes before restarting.
During the wait time, the display will
flash the message Cool On (or Heat
On if you have a heat pump). When
the safe wait time has elapsed, the
message stops flashing and the
compressor turns on.
We
Wake
am
Cool
75
On
6:30
M32711
Battery replacement
Install two fresh AAA batteries when
Lo Batt flashes on the screen. Lo
Batt appears for 60 days before the
batteries are depleted.
Replace batteries once a year, or
when you will be away for more than a
month.
Most settings are stored in non-
volatile (permanent) memory. Only the
clock and the day must be set after
you replace the batteries.
Pull at bottom to remove
thermostat from wallplate.
Turn thermostat
over, insert fresh AAA
alkaline batteries, then
reinstall thermostat.
Set the System switch to Off before removing
the batteries. Otherwise, the heating/cooling
system could remain activated even when
batteries are removed.
RTHXXXX
M32707
W/
Aux
Not
Used
Heat Off Cool Auto On
Fan
M32705

15
Troubleshooting
If you have difficulty with your thermostat, please try the following suggestions.
Most problems can be corrected quickly and easily.
Display is
blank
• Check circuit breaker and reset if necessary.
• Make sure power switch at heating & cooling system is on.
• Make sure furnace door is closed securely.
• Make sure fresh AAA alkaline batteries are correctly
installed.
Heating
or cooling
system does
not respond
• Set system switch to Heat. Make sure the temperature is
set higher than the Inside temperature.
• Set system switch to Cool. Make sure the temperature is
set lower than the Inside temperature.
• Wait 5 minutes for the system to respond.
Temperature
settings do
not change
Make sure heating and cooling temperatures are set to
acceptable ranges:
• Heat: 40° to 90°F (4.5° to 32°C).
• Cool: 50° to 99°F (10° to 37°C).
“Cool On” or
“Heat On” is
flashing
• Compressor protection feature is engaged. Wait 5 minutes
for the system to restart safely, without damage to the
compressor.
“Heat On” is
not displayed
• Set the System switch to Heat, and set the temperature
level above the current room temperature.
“Cool On” is
not displayed
• Set the System switch to Cool, and set the temperature
level below the current room temperature.
For assistance with this product, please visit resideo.com or call Resideo
Customer Care toll-free at 18004681502.

33-00100EF-03
Resideo Technologies Inc.
1985 Douglas Drive North, Golden Valley, MN 55422
1-800-468-1502
33-00100EF—03 M.S. Rev. 02-20 | Printed in United Stateswww.resideo.com
©2020 Resideo Technologies, Inc. All rights reserved.
The Honeywell Home trademark is used under license from Honeywell
International, Inc. This product is manufactured by Resideo Technologies,
Inc. and its affiliates.
Tous droits réservés. La marque de commerce Honeywell Home est utilisée
avec l’autorisation d’Honeywell International, Inc.
Ce produit est fabriqué par Resideo Technologies, Inc. et ses sociétés
affiliées.
1-year limited warranty
Resideo warrants this product, excluding battery, to be free from defects in workmanship or materials, under normal
use and service, for a period of one (1) year from the date of first purchase by the original purchaser. If at any time
during the warranty period the product is determined to be defective due to workmanship or materials, Resideo shall
repair or replace it (at Resideo’s option).
If the product is defective,
(i) return it, with a bill of sale or other dated proof of purchase, to the place from which you purchased it; or
(ii) call Resideo Customer Care at 18004681502. Customer Care will make the determination whether the
product should be returned to the following address: Resideo Return Goods, 1985 Douglas Dr. N., Golden Valley, MN
55422, or whether a replacement product can be sent to you.
This warranty does not cover removal or reinstallation costs. This warranty shall not apply if it is shown by Resideo that
the defect was caused by damage which occurred while the product was in the possession of a consumer.
Resideo’s sole responsibility shall be to repair or replace the product within the terms stated above. RESIDEO SHALL
NOT BE LIABLE FOR ANY LOSS OR DAMAGE OF ANY KIND, INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL
DAMAGES RESULTING, DIRECTLY OR INDIRECTLY, FROM ANY BREACH OF ANY WARRANTY, EXPRESS OR IMPLIED,
OR ANY OTHER FAILURE OF THIS PRODUCT.
Some states do not allow the exclusion or limitation of incidental or consequential damages, so this limitation may not
apply to you.
THIS WARRANTY IS THE ONLY EXPRESS WARRANTY RESIDEO MAKES ON THIS PRODUCT. THE DURATION OF ANY
IMPLIED WARRANTIES, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE, IS HEREBY LIMITED TO THE ONE YEAR DURATION OF THIS WARRANTY. Some states do not allow
limitations on how long an implied warranty lasts, so the above limitation may not apply to you.
This warranty gives you specific legal rights, and you may have other rights which vary from state to state. If you have
any questions concerning this warranty, please write Resideo Customer Care, 1985 Douglas Dr, Golden Valley, MN
55422 or call 18004681502.

RTH2300/RTH221
Série
Lire avant l’installation
Pour obtenir de l’aide veuillez
visiter resideo.com
Manuel du
propriétaire
RTH221B1047
RTH2300B1020
Thermostat
programmable
Identifier le type de système
Ce thermostat est compatible avec les systèmes suivants:
• À gaz, mazout ou électrique
• Climatiseur central
• Système à eau chaude avec ou sans pompe
• Système millivolts
• Système de chauffage-refroidissement central
• Pompe thermique sans chauffage auxiliaire/de secours
Besoin d’aide? Nous sommes à votre service
Composer le 18004681502 pour obtenir de l’aide au
raccordement avant de retourner le thermostat au magasin.
Ce thermostat ne peut pas être utilisé sur les pompes
thermiques avec chauffage auxiliaire ou les systèmes
à plusieurs étages.
Entrée : 2 piles AAA de 1,5 V

2
AVIS : Pour éviter d’endommager le compresseur, ne faites pas
fonctionner le climatiseur si la température extérieure est inférieure à
10 °C (50 °F).
ATTENTION : AVIS RELATIF AU RECYCLAGE
DU MERCURE
Ce produit ne contient aucun mercure.
Cependant, ce produit peut remplacer un produit
qui contient du mercure. Le mercure et les
produits contenant du mercure ne doivent pas
être jetés aux ordures ménagères.
Pour obtenir plus d›informations pour savoir
comment et où recycler adéquatement un
thermostat contenant du mercure aux États-
Unis, consultez l›organisme de recyclage des
thermostats (Thermostat Recycling Corporation)
à www.thermostat-recycle.org.
Pour le recyclage de thermostats contenant
du mercure au Canada, consultez l›organisme
Switch the Stat à www.switchthestat.ca
NO MERCUR
Y
NE PAS JETER
LE MERCURE
Hg
RTHXXXX
M32707
Services à la clientèle
Pour obtenir de l’aide avec ce produit, veuillez
consulter le site resideo.com
ou vous adresser aux Services à la clientèle de
Resideo en composant le 18004681502.
Pour gagner du temps, veuillez prendre en note le
numéro de modèle et de code de date du thermostat
avant d’appeler.
Retourner le thermostat pour trouver le
numéro de modèle et le code de date.

3
Installation
Installation....................................................... 3
Guía de instalación avanzada................8
À propos du thermostat
Aide-mémoire sur les commandes
et l’écran d’accueil ....................................10
Programmes d’économie
d’énergie préconfigurés .........................11
Programmation et fonctionnement
Réglage de l’horloge ................................11
Réglage des programmes.....................11
Dérogation temporaire
de la programmation............................... 13
Dérogation permanente
de la programmation............................... 13
Protection du compresseur .................14
Remplacement des piles....................... 14
Annexes
Dépannage ...................................................15
Garantie limitée.......................................... 16
Table des matières
1 Couper le courant du système de chauffage/de
climatisation
ou
M31535
Disjoncteur Interrupteur
d’alimentation du système
de chauffage/refroidissement

4
2 Retirer l’ancien thermostat
Retirer l’ancien thermostat, mais laisser en place la plaque murale et les fils
sans les détacher.
M32731
TO REMOVE WALLPLATE
PULL HERE
Plaque de montage
Laisser la plaque
de montage en
place
www.honeywellhome.com
C
C
MCR33823
Désignation de
la borne
Si vous possédez un thermostat plus ancien à tube
de mercure scellé, allez à la page 2 pour les
instructions de mise au rebut correctes.
Étiquettes de fils
Désignation de la borne
C
C
MCR31537
3 Étiqueter les fils
Étiqueter les fils à l’aide des étiquettes fournies à mesure que les fils sont
débranchés.
4 Séparer la plaque murale du nouveau thermostat
Retirer la plaque murale du nouveau thermostat et l’installer au mur.