Honeywell RTH4300B User manual

Operating
Manual
RTH4300B
Programmable Thermostat
69-2226EFS-05
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Quick Reference Card
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This manual covers the following model:
RTH4300B: For 1 Heat/1 Cool systems
M28311
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 69-2226EFS—05
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
Customer assistance ................................15
Accessories.............................................. .15
In case of difficulty .................................... 16
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

Operating Manual
69-2226EFS—05 2
About your new thermostatAbout 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.
• Large,cleardisplayiseasytoread.
• Displaysbothroomtemperatureandtemperaturesetting.
• Built-incompressorprotection.
• Backlitdisplayiseasytoread—eveninthedark.
2

RTH4300B Programmable Thermostat
3 69-2226EFS—05
About your new thermostatQuick reference to controls
M28312
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
69-2226EFS—05 4
About your new thermostat
Wake
Wed
Heat On
Set To
Inside
AM
75
75
6:30
Replace Batt
M28313
Quick reference to display screen
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 69-2226EFS—05
About your new thermostat
Set
Clock
AM
6:30
M28314
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 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.
Wed
Set Day
M28315
Press SET, then select current day.

Operating Manual
69-2226EFS—05 6
About your new thermostatSelect the sytstem 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.
M28316
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 69-2226EFS—05
About your new thermostat
M28316
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.Use
this setting for improved air circulation, or for
more efficient air cleaning.
Set FAN switch to choose whether the fan
runs continuously or only as needed.

Operating Manual
69-2226EFS—05 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 °