Honeywell RTH4300B User manual

Operating
Manual
RTH4300B
Programmable Thermostat
69-1771EFS

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Copyright © 2006 Honeywell International Inc. All rights reserved.
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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
3
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
4
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 °