Honeywell RTHL2510 series User manual

Owner’s Manual
Read and save these
instructions.
RTHL2510/RTHL2410
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
•Heat pump with auxiliary/backup heat

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.
NO MERCUR
Y
Hg
RTHXXXX
M32707
Customer assistance
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...........................9
About your new thermostat
Controls and Home screen
quick reference...................................11
Preset energy-saving schedules........12
Programming and operation
Setting the clock.................................12
Adjusting program schedules.............13
Overriding schedules temporarily ......14
Overriding schedules permanently ....14
Compressor protection.......................15
Early Start ..........................................15
Replace batteries ...............................16
Appendices
Troubleshooting..................................17
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
M28100
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.
Drill 3/16-in. holes for drywall
Drill 3/32-in. holes for plaster
6 Connect Wires
Simply match wire labels.
If labels do not match letters on the thermostat, check “Alternate Wiring
(Conventional Systems)” on page 6 and connect to terminal as shown (see
notes, below).
M32715
SCREW
INSERT WIRES
AND TIGHTEN
SCREWS
WIRE
HOLE
LABELED
WIRES
W/
Aux
W
Y
G
R
Not
Used
Remove metal
jumper if you
have both Rand
Rc wires.
W/
Aux
Not
Used
M32714

6
Alternate Wiring (Conventional Systems)
If labels do not match letters on the thermostat, check the chart below and
connect to terminal as shown here (see notes, below).
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
W/
AUX
NOT
USED
R Rc
M32726
44
M32727
GW/
AUX
OBY
Y
G
O
R
R
Rc
Aux
Alternate Wiring (Heat Pump)
If labels do not match letters on thermostat, see page 7.

7
7 Install Batteries
Install two AAA alkaline batteries.
Back of thermostat
RTHXXXX
M32707
Alternate wiring (for heat pumps with auxiliary or backup heat only)
If labels do not match letters on the thermostat, check the chart below and
connect to terminal as shown here (see notes, below).
Leave metal jumper in place, connecting R& Rc terminals.
If your old thermostat had both Vand VR wires, stop now and contact a
qualified contractor for help.
If your old thermostat had separate Oand Bwires, wrap the B wire in
electrical tape and do not connect.
If your old thermostat had Y1, W1 and W2 wires, stop now and contact a
qualified contractor for help.
Do not use Cor Xwire. Do not use Bwire if you already have Owire.
Wrap bare end of wire with electrical tape.
Do not use Lwire. Wrap bare end of wire with electrical tape.
If your old thermostat had Eand Aux wires (or alternate wires), connect
both wires to Aux terminal.
5
6
7
M32728
2
7
4
AUX
W
W1
W2
F
BOG
H
C
RC
V
VR
B
X
R
M
Y1
Y
E
7
X
X2
L
F
6532
1
B O G Y
W/
AUX
NOT
USED
R Rc

8
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

9
11If 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* with Backup Heat
Continue with Advanced Installation to match your thermostat to your system
type.
*Heat Pump—an air conditioner that provides cooling in the summer, and also
runs in reverse in the winter to provide heating.
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

10
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
1 select system type 0 Heating & cooling: Gas, oil or electric heating with central
air conditioning or heat pump without auxiliary/back-up heat.
1 Heat pump with auxiliary/backup heat: Outside
compressor provides both heating and cooling.
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.
13 select Early Start 1 On
0 Off
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 0 12-hour display
1 24-hour display
40 restore program schedule to
default settings
0 Off
1 On: Program schedule default settings are listed on
page12.
* 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 Honeywell thermostat has been designed to give you many years of
reliable service and easy-to-use, push-button climate control.
•Backlit display is easy to read
•Displays ambient (measured) temperature at all times
•One-touch access to setpoint temperature
•Preset program settings
•Temporary and permanent override of schedule
•Early start ensures the right temperature at the right time
•Built-in compressor protection