RTH5100B
Quick Installation Guide
69-2329EF-03
RTH5100B
Non-Programmable Digital Thermostat
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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Turn Off Power to Heating/Cooling System
M28097
1
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Remove Old Thermostat
M28099
2
Remove old thermostat but leave wallplate with wires attached.
Leave wallplate
in place
Old thermostat
Cover
Is there a sealed tube containing
mercury? If so, see back cover
for proper disposal instructions.
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Label Wires with Tags
M28100
M28093
3
Label the wires using the supplied wire labels as you disconnect them.
Wire Labels
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M29532
Separate Wallplate from New Thermostat
4
Remove battery holder.
Wallplate
Pull here to remove wallplate from new thermostat.
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Mount Wallplate
MCR29533
5
Mount the new wallplate using the included screws and anchors.
Drill 3/16-in. holes for drywall
Drill 3/32-in. holes for plaster
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MCR29534
Connect Wires
6
Simply match wire labels.
Labels don’t match? See page 21.
Have a Heat Pump system? See page 13.
We are here to help.
Call 1-800-468-1502 for wiring assistance.
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Remove metal jumper if
you have both R and Rc
wires.
MCR29535
Install Batteries
7
Install two AAA alkaline batteries.
Back of thermostat
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Install Thermostat onto Wallplate
MCR29536
8
Install thermostat onto the
wallplate on the wall.
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Turn Power Back On
M28098
9
Turn the power back on to the heating/cooling system.
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10
If your system type is...
If your system type is:
q Single Stage Heat and Cool
Congratulations, you’re done!
If your system type is:
q Heat Pump* without Backup Heat
q Heat Only
Continue with advanced installation
on page 12 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 ......................................................................................................12
Wiring .................................................................................................................. 19
Troubleshooting ..................................................................................................20
Customer assistance .........................................................................................22
Limited warranty .................................................................................................23
Advanced Installation Guide
Next
1
0
Done
MCR29538
MCR29537
System setup
Press and hold the s and FAN buttons until the screen changes
(approximately 5 seconds).
Press s or t to change
settings.
SettingFunction
Press DONE to exit
and save settings.
TROUBLESHOOTINGASSISTANCE SETUPWIRING
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Press NEXT to advance
to next function.
RTH510 0B
Next
1
0
Done
MCR29539
MCR29540
Function 1: System type
Press the s or t button to select the type of system you have in your
home:
Press to change setting.
When correct setting is
selected, press NEXT to
display next function.
0 Heating & cooling: Gas, oil or electric heating with central air
conditioning.
1 Heat pump: Outside compressor provides both heating and cooling.
2 Heating only: Gas, oil or electric heating without central air
conditioning.
3 Heating 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.)
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TROUBLESHOOTINGASSISTANCESETUP WIRING
Advanced Installation Guide
Next
2
0
Done
MCR29541
MCR29540
Function 2: Heat pump changeover valve
Press the s or t 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.
Press to change setting.
When correct setting is
selected, press NEXT to
display next function.
0 Cooling changeover valve: Use this setting if you connected a wire
labeled “O” to the O/B W wire terminal (see page 21).
1 Heating changeover valve: Use this setting if you connected a wire
TROUBLESHOOTINGASSISTANCE SETUPWIRING
labeled “B” to the O/B W wire terminal (see page 21).
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RTH510 0B
Next
3
0
Done
MCR29542
MCR29540
Function 3: Heating fan control
Press the s or t button to select your heating system and fan operation:
NOTE: If Function 3 does not appear, please turn to the next page to
continue.
Press to change setting.
When correct setting is
selected, press NEXT to
display next function.
TROUBLESHOOTINGASSISTANCESETUP WIRING
0 Gas or oil heat: Use this setting if you have a gas or oil heating system
(system controls fan operation).
1 Electric heat: Use this setting if you have an electric heating system
(thermostat controls fan operation).
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Advanced Installation Guide
Next
5
5
Done
MCR29543
MCR29540
Function 5: Heating cycle rate
Press the s or t button to 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.
9 Electric furnace: Use this setting if you have any type of electric
heating system.
3 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.
TROUBLESHOOTINGASSISTANCE SETUPWIRING
1 Gas/oil steam or gravity system: Use this setting if you have a steam
or gravity heat system.
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NOTE: If Function 5 does not appear, please
turn to the next page to continue.
Press to change setting.
When correct setting is
selected, press NEXT to
display next function.
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