Quick Installation Guide
RTH6400 Series
Programmable Thermostat
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Installation is Easy
Label wires and remove your old thermostat
Install and wire your new thermostat
Set your new thermostat to match your heating/cooling system
–It is preset for the most common system
We are here to help.
Call 1-800-468-1502 for wiring assistance before returning the thermostat to the store.
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ii |
1Turn Off Power to Heating/ Cooling System
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2Remove Old Thermostat
Remove old thermostat but leave wallplate with wires attached.
Is there a sealed tube containing
mercury? If so, see back cover Leave wallplate for proper disposal instructions. in place
Old thermostat 
Cover
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3Label Wires with Tags
Label the wires using the supplied wire labels as you disconnect them.
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Wire Labels
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4Separate Wallplate from New Thermostat
Remove battery holder.
Pull here to remove wallplate from new thermostat.
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Wallplate
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5Insert Quick Reference Card
Insert quick reference card into slot in back of thermostat.
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Thermostat
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6Mount Wallplate
Mount the new wallplate using the included screws and anchors.
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Drill 3/16-in. holes for drywall
Drill 3/32-in. holes for plaster
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7Connect Wires
Simply match wire labels.
Remove metal jumper if you have both R and Rc wires.
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Labels don’t match? See page 21.
Have a Heat Pump system? See page 14. We are here to help.
Call 1-800-468-1502 for wiring assistance.
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8Install Batteries
Install two AA alkaline batteries.
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Back of thermostat
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9Install Thermostat onto Wallplate
Install thermostat onto the wallplate on the wall.
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10 Turn Power Back On
Turn the power back on to the heating/cooling system.
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11 If your system type is...
If your system type is:
θ Single Stage Heat and Cool
Congratulations, you’re done!
If your system type is:
θHeat Pump* without Backup Heat
θHeat Only
θCool Only
Continue with advanced installation
on page 13 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 heat pump systems or 120/240 Volt systems.
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Advanced Installation |
|
System setup...................................................................... |
13 |
Wiring................................................................................... |
21 |
Troubleshooting.................................................................. |
22 |
Customer assistance.......................................................... |
25 |
Limited warranty................................................................. |
26 |
RTH6400
SystemAbout yoursetupnew thermostat
Press and hold the σ and FAN buttons until the screen changes (approximately 5 seconds).
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Press σ or τ to change settings.
Function Setting
1 0
Done |
Next |
|
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Press DONE to exit |
Press NEXT to advance |
and save settings. |
to next function. |
SETUP
TROUBLESHOOTING ASSISTANCE WIRING
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SETUP
TROUBLESHOOTING ASSISTANCE WIRING
Advanced Installation Guide
Function 1: System type
Press the σ or τ button to select the type of system you have in your home:
1 0
Done |
Next |
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0Heating & cooling: Gas, oil or electric heating with central air conditioning.
1Heat pump: Outside compressor provides both heating and cooling.
2Heating only: Gas, oil or electric heating without central air conditioning.
3Heating only with fan: Gas, oil or electric heating without central air conditioning. (Use this setting if you could turn the fan on and off with a fan switch on your old thermostat.)
Press to change setting. When correct setting is selected, press NEXT to display next function.
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RTH6400
Function 2: Heat pump changeover valve
Press the σ or τ button to select whether your changeover valve is used in heating or cooling:
NOTE: If Function 2 does not appear, please turn to the next page to continue.
2 0
Done |
Next |
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0Cooling changeover valve: Use this setting if you connected a wire labeled “O” to the O/B W wire terminal (see page 21).
1Heating changeover valve: Use this setting if you connected a wire labeled “B” to the O/B W wire terminal (see page 21).
Press to change setting. When correct setting is selected, press NEXT to display next function.
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SETUP
TROUBLESHOOTING ASSISTANCE WIRING
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SETUP
TROUBLESHOOTING ASSISTANCE WIRING
Advanced Installation Guide
Function 3: Heating fan control
Press the σ or τ button to select your heating system and fan operation:
NOTE: If Function 3 does not appear, please turn to the next page to continue.
3 0
Done |
Next |
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0Gas or oil heat: Use this setting if you have a gas or oil heating system (system controls fan operation).
1Electric heat: Use this setting if you have an electric heating system (thermostat controls fan operation).
Press to change setting. When correct setting is selected, press NEXT to display next function.
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