Honeywell RTH6400 User Manual
69-2210EF-03
Quick Installation Guide
RTH6400 Series
Programmable 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.
69-2210EF—03 ii
Turn Off Power to Heating/
M28097
1
Cooling System
1 69-2210EF—03
Remove Old Thermostat
M28099
2
Remove old thermostat but leave wallplate with
wires attached.
Is there a sealed tube containing
Leave wallplate
in place
Old thermostat
mercury? If so, see back cover
for proper disposal instructions.
Cover
69-2210EF—03 2
Label Wires with Tags
M28100
M28093
3
Label the wires using the supplied wire labels as you
disconnect them.
Wire Labels
3 69-2210EF—03
M28343
Separate Wallplate from
4
New Thermostat
Remove battery holder.
Pull here to remove wallplate from new
thermostat.
Wallplate
69-2210EF—03 4
M2834
M28344
Insert Quick Reference Card
5
Insert quick reference card into slot in back of thermostat.
Thermostat
5 69-2210EF—03
Mount Wallplate
M28345
6
Mount the new wallplate using the included screws
and anchors.
Drill 3/16-in. holes for drywall
Drill 3/32-in. holes for plaster
69-2210EF—03 6
M27513
Connect Wires
7
Simply match wire labels.
Remove metal jumper if
you have both R and Rc
wires.
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.
7 69-2210EF—03
M28346
Install Batteries
8
Install two AA alkaline batteries.
Back of thermostat
69-2210EF—03 8
M28347
Install Thermostat onto Wallplate
9
Install thermostat onto the wallplate on the wall.
9 69-2210EF—03
10
M28098
Turn the power back on to the heating/cooling system.
Turn Power Back On
69 -2 210EF—03 10
11
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
q Cool 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.
11 69-2210EF—03
Advanced Installation
System setup ......................................................................13
Wiring ..................................................................................21
Troubleshooting ..................................................................22
Customer assistance .........................................................25
Limited warranty .................................................................26
RTH640 0
M28348
Done Next
1
0
M28349
About your new thermostat
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
SETUP WIRING ASSISTANCE TROUBLESHOOTING
Press DONE to exit
and save settings.
13 69-2210EF—03
Press NEXT to advance
to next function.
Advanced Installation Guide
Done Next
1
0
M28350
M28351
Function 1: System type
Press the s or t button to select the type
of system you have in your home:
SETUPWIRINGASSISTANCETROUBLESHOOTING
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.)
Press to change setting.
When correct setting is
selected, press NEXT to
display next function.
69-2210EF—03 14
RTH640 0
Done Next
2
0
M28352
M28351
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.
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 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.
SETUP WIRING ASSISTANCE TROUBLESHOOTING
15 69-2210EF—03
Advanced Installation Guide
Done Next
3
0
M28353
M28351
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.
SETUPWIRINGASSISTANCETROUBLESHOOTING
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).
Press to change setting.
When correct setting is
selected, press NEXT to
display next function.
69-2210EF—03 16
Loading...