Honeywell RTH2310 User manual

RTH2310
Programmable Thermostat
Operating
Manual
69-2229ES-05

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® U.S. Registered Trademark. Patents pending.
© 2011 Honeywell International Inc. All rights reserved.
CAUTION: EQUIPMENT DAMAGE HAZARD
To prevent possible compressor damage, do not use Cooling mode when the outdoor
temperature is below 50 °F (10 °C).

RTH2310 Programmable Thermostat
About your new thermostat
Thermostat features ..................................... 2
Early Start..................................................... 3
Compressor protection ................................. 3
Quick reference to controls .......................... 4
Quick reference to display............................ 5
Quick start .................................................... 6
Programming & Operation
Set the clock................................................. 7
Select system setting (Heat/Cool) ................ 8
Select fan setting (Auto/On) ......................... 9
Using the schedule................................ 10-13
Temporary schedule override ..................... 14
Permanent schedule override .................... 15
Appendices
Filter replacement........................................16
Battery replacement ....................................17
In case of difficulty.......................................18
Customer assistance...................................19
Limited warranty ..........................................20
Table of contents
Your new thermostat is pre-programmed
and ready to go!
See page 6 for quick start.

Operating Manual
2
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 is easy to read
• Displays ambient (measured) temperature at all times
• One-touch access to setpoint temperature
• Energy-saving settings for maximum cost savings
• Separate programmable weekday/weekend schedules (5+2 day programming)
• Temporary and permanent override of schedule
• Early Start ensures right temperature at the right time
• Built-in compressor protection
About your new thermostat

RTH2310 Programmable Thermostat
3
Early Start allows the thermostat to “learn” how long your furnace or air conditioner takes to reach the set
temperature. Simply program the desired times and desired temperatures into the schedule. The thermostat
will determine when to activate heating or cooling so that the desired temperature is attained at the desired
time.
Example: If you set the Wake time to 6 a.m. and the temperature to 70 °F (21 °C), the heat will come on
before the set time, so the temperature is 70 °F (21 °C) by the time you wake at 6 a.m.
Your thermostat has a feature that helps prevent damage to the compressor of your air conditioning. Because
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, flashes on the screen. When the safe wait time
has elapsed, the icon stops flashing and the compressor turns on.
Early Start
Built-in compressor protection

Operating Manual
4
Quick reference to controls
System switch
(see page 8)
Fan Switch
(see page 9)
Screen
Lit for 12 seconds when
you press the backlight
button or any other button.
Programming buttons
(see pages 12 & 13)
Temperature buttons
Battery compartment (for 2 AA batteries)
Backlight button

RTH2310 Programmable Thermostat
5
Quick reference to display screen
* flashes when the compressor protection is engaged (see page 3).
Temperature
The ambient (measured)
temperature is normally
displayed. To view the
setpoint temperature, press
or once. The setpoint
temperature will appear for
5 seconds.
Replace batteries
(see page 14)
Setpoint indicator
Appears when the setpoint
temperature is displayed.
Time
Current period number
Appears when the thermostat
is following the schedule (see
temporary override on page
14 and permanent override on
page 15)
Day
Heating is on
Cooling is on *
Replace filter
(see page 14)

Operating Manual
6
Simply perform the three steps below and the thermostat is in operation:
1) Set the clock (see page 7)
2) Select whether to heat or cool (see page 8)
3) Select whether to keep the fan on continuously or only when needed (see page 9)
This thermostat is pre-set with energy-saving program settings (see page 11). If you do not wish to use
these settings, you can:
• Modify the schedule and temperature setpoints (see page 12)
• Temporarily override the temperature setpoint (see page 14)
• Permanently override the temperature setpoint (see page 15)
This thermostat is ready to go

RTH2310 Programmable Thermostat
7
1) Press Clk. The hour will flash.
2) Press or to set the hour.
3) Press Clk. The minutes will flash.
4) Press or to set the minutes.
5) Press Clk. The day will flash.
6) Press or to set the day.
7) Press Exit.
NOTE: The time display flashes when the clock has lost its settings
Set the clock
Press to start time and day setting
Press to set the time or the day
Time and day display
Press to end time and day setting
69-2229S_A.fm

Operating Manual
8
Select the system setting
Use the System switch to place the system in one of the
following modes:
•Heat: System is in Heating mode.
•Off: System is off.
•Cool: System is in Cooling mode.
CAUTION: EQUIPMENT DAMAGE HAZARD
Do not use Cooling mode when the outdoor temperature is below 50 °F (10 °C).
NOTE: When you place the thermostat in Cooling mode, you might need to wait up to
five minutes before cooling can start. This is a safety feature for the compressor. will
flash on the screen until cooling starts.

RTH2310 Programmable Thermostat
9
NOTE: The Fan switch is not used if the fan is not connected to the thermostat.
Select the fan setting
Auto The fan runs only when heating or cooling is activated. However, if you have a gas or fuel
oil furnace, when heating is activated, the fan will start only when the air coming out of the
vents is warm enough. The fan will keep on running after heating stops until the air is no
longer warm enough.
On The fan is always running. Use this setting for improved air circulation or for more efficient
air cleaning.
Use the Fan switch to select the fan mode of operation.

Operating Manual
10
The thermostat automatically adjust its temperature setpoint according to the programmed schedule. You can
program up to four periods per day, with different settings for weekdays and weekends. For example, you can
program all four periods for the weekdays but only two periods (Wake and Sleep) for the weekends.
To program a period, you need to set its start time and its two temperature settings (one when the thermostat is in
cooling mode and another one when it is in heating mode).
Save money by using the schedule
Wake Set the time you wake up and the temperature you want in the morning until you leave
(usually a comfortable level).
Leave Set the time you leave home and the temperature you want while you are away (usually an
economical level).
Return Set the time you return home and the temperature you want during the evening until bedtime
(usually a comfortable level).
Sleep Set the time you go to bed and the temperature you want overnight (usually an economical
level).

RTH2310 Programmable Thermostat
11
This thermostat is pre-set with energy-saving program settings. These settings can reduce
your energy bills by 33%. See the next page if you wish to modify the settings.
Energy saving default schedule
Period
Weekdays Weekends
Start time Heat Cool Start time Heat Cool
Wake 6:00 am 70 °F (21 °C) 78 °F (25.5 °C) 6:00 am 70 °F (21 °C) 78 °F (25.5 °C)
Leave 8:00 am 62 °F (16.5 °C) 85 °F (29.5 °C) - - - - - -
Return 6:00 pm 70 °F (21 °C) 78 °F (25.5 °C) - - - - - -
Sleep 10:00 pm 62 °F (16.5 °C) 82 °F (28 °C) 10:00 pm 62 °F (16.5 °C) 82 °F (28 °C)

Operating Manual
12
1) Press Pgm. The settings for period 1 for
Monday through Friday are displayed.
2) Press Day to switch between MO TU WE TH FR
(Monday through Friday) and SA SU (Saturday
and Sunday).
NOTE:Press Day for 3 seconds to select all
7 days.
3) To select another period, press P# until the
desired period number is displayed.
NOTE: To skip the displayed period, press Clr.
For example, periods 2 and 3 have been skipped
for Saturday and Sunday in the default schedule.
To modify the schedule
Temperature
setpoint
Period
start time
Period
number
Program
days
Appears when
the heat setpoint
is displayed
Appears when
the cool setpoint
is displayed

RTH2310 Programmable Thermostat
13
4) While the time display is flashing, press or
to set the time (in increments of 15 minutes).
5) Press P#.
6) While the temperature display is flashing, place
the System switch on Heat and press or
to set the heat temperature. Place the System
switch on Cool and press or to set the
cool temperature.
7) Repeat steps 2 to 6 to set another period.
8) Press Exit.
To modify the schedule (cont’d)
Press to start programming
or to select another period
Press to select the days
Press to end programming
Press to erase (skip) the
displayed period
Press to set the time
or the temperature
Place on Heat when setting
the heat setpoint or on Cool
when setting the cool setpoint

Operating Manual
14
To temporarily override the schedule, press or until the
desired temperature is displayed. The period number will
flash to indicate that the current period has been overridden.
The new temperature will be used for the next 2 hours.
NOTE: Pressing or once will display the setpoint
temperature. To change the setpoint temperature, press
either button more than once.
Press the Mode button if you wish to cancel the temporary
setting.
Temporary override of schedule
The period number flashes
when the schedule is
temporarily overridden
Press to set the
temperature

RTH2310 Programmable Thermostat
15
To permanently override the schedule, press the Mode
button so that the period number disappears. Press or
to manually set the temperature.
Press the Mode button again if you wish to cancel the
override and resume the schedule. The current period
number will appear and the thermostat will be set to the
temperature programmed for that period.
Permanent override of schedule
Press to permanently
override the schedule or
to cancel the override
The period number disappears
when the schedule is
permanently overridden
Press to set the
temperature

Operating Manual
16
After 500 hours of heating or cooling time, an icon appears to indicate that
the filter needs replacement. Once the filter is replaced, press the Filter but-
ton for 3 seconds to remove the icon and reset the counter.
Filter replacement

RTH2310 Programmable Thermostat
17
Set the System switch to Off before removing the batteries.
Otherwise, the heating/cooling system might remain activated even
when batteries are removed.
Install two fresh AA batteries when the low-battery icon flashes on the
screen. The icon will flash for 120 days, then the thermostat will cut power to
the heating/cooling unit. The icon disappears once the batteries are
replaced.
Replace batteries once a year or before leaving home for more than a month.
After replacing the batteries, set the time and the day (see page 7). The other settings are
not erased when the thermostat is without power.
Battery replacement

Operating Manual
18
In case of difficulty
Screen is blank. • Ensure two fresh AA alkaline batteries are
correctly installed.
Temperature settings cannot be
changed.
• You are setting the temperature outside its
allowable range:
• Heat: 41 °F to 82 °F (5 °C to 28 °C )
• Cool: 59 °F to 95 °F (15 °C to 35 °C)
is flashing. • The compressor protection delay is underway.
Wait for the delay to end (maximum of 5 minutes).
HI appears on the screen. • The ambient (measured) temperature is above
122 °F (50 °C).
LO appears on the screen. • The ambient (measured) temperature is below
23 °F (-5 °C).