Quick Installation Guide
RTHL2310/RTHL221 Series
Programmable Thermostat
69-2578EF-01
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
Do you need assistance?
We are here to help.
Call 1-800-468-1502 for wiring assistance before returning the thermostat to the store.
This thermostat cannot be used on heat pumps or on multistage systems.
69-2578EF—01 |
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1 |
Turn Off Power to Heating/ |
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Cooling System |
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M28097
1 69-2578EF—01
2 Remove Old Thermostat
Remove old thermostat but leave wallplate with wires attached.
Do not remove |
Is there a sealed tube containing |
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mercury? If so, see back cover for |
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wallplate yet |
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proper disposal instructions. |
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Old thermostat
Cover
M28099
69-2578EF—01 |
2 |
3 Label Wires with Tags
Label the wires using the supplied wire labels as you disconnect them.
M28100
Wire Labels
M28093
3 69-2578EF—01
4 |
Separate Wallplate from |
New Thermostat |
Remove wallplate from the new thermostat and mount onto wall.
TO REMOVE WALLPLATE
PULL HERE
M32731
Wallplate
69-2578EF—01 |
4 |
5 Mount Wallplate
Mount the new wallplate using the included screws and anchors.
M32714
Drill 3/16-in. holes for drywall
Drill 3/32-in. holes for plaster
5 69-2578EF—01
6 Connect Wires
Simply match wire labels.
G
INSERT WIRES
AND TIGHTEN SCREWS
SCREW 
WIRE
HOLE
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LABELED |
Y |
R |
WIRES |
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W |
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W UsedNot
M32732
Remove metal jumper if you have both R and Rc wires.
Labels don’t match? See page 20. We are here to help.
Call 1-800-468-1502 for wiring assistance.
69-2578EF—01 |
6 |
7 |
Install Batteries |
Install two AAA alkaline batteries.
RTHXXXX
M32707
Back of thermostat
7 69-2578EF—01
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.)
RTHXXXX
GAS OR OIL
ELECTRIC OR HEAT PUMP
GAS OR OIL
ELECTRIC OR HEAT PUMP
M32716
69-2578EF—01 |
8 |
9 Install Thermostat onto Wallplate
Install thermostat onto the wallplate on the wall.
W/ Not
Aux Used
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Fan |
Heat Off Cool |
Auto On |
M32705
9 69-2578EF—01
10 Turn Power Back On
Turn the power back on to the heating/cooling system.
M28098
69-2578EF—01 |
10 |
11 If your system type is...
If your system type is:
θSingle Stage Heat and Cool
θHeat Only or Cool Only
Congratulations, you’re done!
If your system type is:
θ Heat Pump* with Backup Heat
Continue with advanced installation
on next page 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.
If you are not sure of your system type or if you have other questions, call us toll-free at 1-800-468-1502.
This thermostat works on 24 volt or 750 mV systems. It will NOT work on multi-stage conventional systems or 120/240 Volt systems.
11 69-2578EF—01
Advanced Installation |
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Enter system setup.............................................................. |
13 |
Changing settings................................................................ |
14 |
Heating cycle rate................................................................ |
15 |
Temperature display............................................................. |
16 |
Compressor protection......................................................... |
17 |
Clock display........................................................................ |
18 |
Restore program schedule default....................................... |
19 |
Alternate wiring.................................................................... |
20 |
Troubleshooting.................................................................... |
21 |
Customer assistance........................................................... |
22 |
Limited warranty................................................................... |
23 |
RTHL2310/RTHL221
System setup
Enter System Setup
To enter system setup, press and hold both the σ and τ buttons until the display changes (approximately 5 seconds).
SETUP
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Fan |
Heat Off Cool |
Auto On |
13 69-2578EF—01
SETUP
Advanced Installation Guide
System setup
Changing Settings
See pages 15–19 to change Function Settings.
Function Setting
5 5
M32779
Change Function |
Change Setting |
1.Press the σ or τ button to change the setting.
2.Press the σ and τ buttons simultaneously for one second to advance to the next function.
3.Press the Run button to exit and save settings.
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.
69-2578EF—01 14
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