Honeywell RTH4300B User manual

Operating
Manual
RTH4300B
Programmable Thermostat
69-1771EFS

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For assistance with this product please visit http://yourhome.honeywell.com
or call Honeywell Customer Care toll-free at 1-800-468-1502
® U.S. Registered Trademark. Patents pending.
Copyright © 2006 Honeywell International Inc. All rights reserved.
Quick Reference Card
Grasp and pull to see basic operating instructions at a glance.
This manual covers the following model:
RTH4300B: For 1 Heat/1 Cool systems
CAUTION: EQUIPMENT DAMAGE HAZARD.
To prevent possible compressor damage, do not operate cooling system when outdoor
temperature is below 50°F (10°C).

RTH4300B Programmable Thermostat
1
About your new thermostat
Thermostat features...................................2
Quick reference to controls.......................3
Quick reference to display ........................4
Programming & Operation
Set time and day........................................5
Select system setting ................................6
Select fan setting.......................................7
Using program schedules .........................8
Program schedule overrides ...................11
Compressor protection............................13
Appendices
Battery replacement ................................ 14
In case of difficulty...................................15
Customer assistance ...............................17
Accessories............................................. .17
1-year limited warranty............................18
This thermostat is ready to go!
Your new thermostat is pre-programmed
and ready to go.
See page 9 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
• Separately programmable weekday/weekend schedules.
• One-touch temp control overrides program schedule at any time.
• Energy Star® compliant to greatly reduce your heating/cooling expenses.
• Large, clear display is easy to read.
• Displays both room temperature and temperature setting.
• Built-in compressor protection.
Operating Manual
2

RTH4300B Programmable Thermostat
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About your new thermostatQuick reference to controls
Temperature adjustment (see page 10-12)
Fan Switch (see page 7)
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 temperature control.
• Run: Press to resume program
schedule.
System switch (see page 6)
• Cool: Cooling system control.
• Off: All systems off.
• Heat: Heating system control.

Operating Manual
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About your new thermostatQuick reference to display screen
Wake
Wed
Heat On
Set To
Inside
AM
75
75
6:30
Replace Batt
Low battery warning
(see page 14)
Temperature setting
(see pages 10-12)
System status
Cool on: Cooling
system is on.
Heat on: Heating
system is on.
Current day/time (see page 5)
Current inside
temperature
Current program period
Wake/Leave/Return/Sleep
(see pages 8-9)

RTH4300B Programmable Thermostat
5
About your new thermostatSet 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 display flashes Set Clock, the
thermostat will follow your settings for the
weekday “Wake” time period until you reset
the time and day.
Press SET, then adjust time.
Press SET, then select current day.
Set
Clock
AM
6:30
Wed
Set Day

Operating Manual
6
About your new thermostatSelect the sytstem setting
The SYSTEM switch can be set to control
your heating or cooling system, depend-
ing 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).

RTH4300B Programmable Thermostat
7
About your new thermostatSelect 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 heat-
ing or cooling system is on.
If set to “On,” the fan runs continuously.
Use this setting for improved air circula-
tion, or for more efficient air cleaning.
Set FAN switch to choose whether the fan
runs continuously or only as needed.

Operating Manual
8
About your new thermostatSave money by setting program schedules
It’s easy to program your system for maximum energy savings. You can program four
time periods each day, with different settings for weekdays and weekends.
Set to the time you awaken and the temperature you want
during the morning, until you leave for the day.
Set to the time you leave home and the temperature you
want while you are away (usually an energy-saving level).
Set to the time you return home and the temperature you
want during the evening, until bedtime.
Set to the time you go to bed and the temperature you want
overnight (usually an energy-saving level).
WAKE
6:00 am
70 °
LEAVE
8:00 am
62 °
RETURN
6:00 pm
70 °
SLEEP
10:00 pm
62 °

RTH4300B Programmable Thermostat
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About your new thermostatEnergyStar®settings for maximum cost savings
This thermostat is pre-set to use EnergyStar®program settings. We recommend these
settings, since they can reduce your heating/cooling expenses by as much as 33%.
(See next page to adjust times and temperatures of each time period.)
Wake
(6:00 am)
Leave
(8:00 am)
Return
(6:00 pm)
Sleep
(10:00 pm)
Cool (Mon-Fri)Heat (Mon-Fri) Heat (Sat-Sun) Cool (Sat-Sun)
70 °75 °70 °75 °
62 °83 °62 °
[Or cancel period]
83 °
[Or cancel period]
70 °75 °70 °
[Or cancel period]
75 °
[Or cancel period]
62 °78 °62 °78 °

Operating Manual
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About your new thermostatTo adjust program schedules
1. Press SET until Set Schedule is displayed.
2. Press s or t to set your weekday Wake
time (Mon-Fri), then press SET.
3. Press s or t to 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 (Sat-
Sun), then press RUN to save & exit.
Note: Make sure the thermostat is set to the system
you want to program (Heat or Cool).
Note: To cancel an unwanted time period (except
Wake), press and hold s+ HOLD for 4 seconds
while in the Set Schedule mode.
Press SET 3 times, then adjust time.
Press SET, then set desired temperature.
Wake
Set Schedule
MonTueWedThuFri
Heat
Set To
AM
75
6:30
Wake
Set Schedule
MonTueWedThuFri
Heat
Set To
AM
75
6:30

RTH4300B Programmable Thermostat
11
About your new thermostatProgram schedule override (temporary)
Press s or t to immediately adjust the
temperature. This will temporarily override
the temperature setting for the current
time period.
The new temperature will be maintained
only until the next programmed time
period begins (see page 8). For example,
if you want to turn up the heat early in the
morning, it will automatically be lowered
later, when you leave for the day.
To cancel the temporary setting at any
time, press RUN.
Press to temporarily adjust temperature.
Press to cancel temporary setting and
resume program schedule.
Set To
AM
70
6:30
Temporary
Set To
AM
75
6:30
Note: Make sure the thermostat is set to the
system you want to control (heat or cool).

Operating Manual
12
About your new thermostatProgram schedule override (permanent)
Note: Make sure the thermostat is set to the
system you want to control (heat or cool).
Press to permanently adjust temperature. 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.
Set To
AM
70
6:30
Hold
Set To
AM
75
6:30
Press to cancel “Hold” setting and resume
program schedule.

RTH4300B Programmable Thermostat
13
About your new thermostatBuilt-in compressor protection
Wake
Wed
Cool
On
Set ToInside
AM
75
75
6:30
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 fea-
ture 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.
Message flashes until safe restart
time has elapsed.

Operating Manual
14
About your new thermostatBattery replacement
Install fresh batteries when the
REPLACE BATT warning begins flash-
ing. The warning flashes about two
months before the batteries are
depleted.
Replace batteries once a year, or
before leaving home for more than a
month. If batteries are inserted within
one minute, the time and day will not
have to be reset. All other settings are
permanently stored in memory, and
do not require battery power.
Pull at bottom to
remove thermostat
from wallplate.
Turn thermostat over,
insert fresh AA alkaline
batteries, then reinstall
thermostat.

RTH4300B Programmable Thermostat
15
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 AA alkaline batteries are correctly installed (see
page 14).
Heating or
cooling system
does not respond
• Set system switch to Heat (see page 6). Make sure the temperature is
set higher than the Inside temperature.
• Set system switch to Cool (see page 6). Make sure the temperature is
set lower than the Inside temperature.
• Wait 5 minutes for the system to respond.
In case of difficulty

Operating Manual
16
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 (see page 13).
“Heat On” is not
displayed
•Set the System switch to Heat, and set the temperature level above the
current room temperature (see page 6).
“Cool On” is not
displayed
•Set the System switch to Cool, and set the temperature level below the
current room temperature (see page 6).
To restore
Energy Star®
default settings
Follow these steps to restore Energy Star default settings (see page 9):
1. Press SET 3 times to display “Set Schedule.”
2. Press and hold SET and RUN at the same time for 4 seconds.
3. Press RUN.
In case of difficulty

RTH4300B Programmable Thermostat
17
About your new thermostat
Customer assistance
For assistance with this product, please visit
http://yourhome.honeywell.com.
Or call Honeywell Customer Care toll-free at
1-800-468-1502.
To save time, please note your model number
and date code before calling.
Accessories
To order, please call Honeywell Customer
Care toll-free at 1-800-468-1502.
Cover plate assembly* ...Part No. 50002883-001
*Use to cover marks left by old thermostats.
Turn thermostat over
to find model number
and date code.
Pull at bottom to
remove thermostat
from wallplate.

Operating Manual
18
1-year limited warranty
Honeywell warrants this product, excluding battery, to be free from defects in the workmanship
or materials, under normal use and service, for a period of one (1) year from the date of pur-
chase by the consumer. If at any time during the warranty period the product is determined to
be defective or malfunctions, Honeywell shall repair or replace it (at Honeywell’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 pur-
chased it; or
(ii) call Honeywell Customer Care at 1-800-468-1502. Customer Care will make the determina-
tion whether the product should be returned to the following address: Honeywell Return Goods,
Dock 4 MN10-3860, 1885 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 Honeywell that the defect or malfunction was caused by damage which occurred
while the product was in the possession of a consumer.
Honeywell’s sole responsibility shall be to repair or replace the product within the terms stated
above. HONEYWELL SHALL NOT BE LIABLE FOR ANY LOSS OR DAMAGE OF ANY KIND,
INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING, DIRECTLY OR