Honeywell RTH6400 Series User manual

RTH6400 Series
Programmable Thermostat
69-2210EF-03
Quick Installation Guide

69-2210EF—03 ii
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.

1 69-2210EF—03
1Turn Off Power to Heating/
Cooling System
M28097

69-2210EF—03 2
Remove old thermostat but leave wallplate with
wires attached.
2Remove Old Thermostat
M28099
Is there a sealed tube containing
mercury? If so, see back cover
for proper disposal instructions.
Leave wallplate
in place
Old thermostat
Cover

3 69-2210EF—03
Label the wires using the supplied wire labels as you
disconnect them.
3Label Wires with Tags
Wire Labels
M28100
M28093

69-2210EF—03 4
M28343
4Separate Wallplate from
New Thermostat
Wallplate
Pull here to remove wallplate from new
thermostat.
Remove battery holder.

5 69-2210EF—03
M2834
M28344
Insert quick reference card into slot in back of thermostat.
Thermostat
5Insert Quick Reference Card

69-2210EF—03 6
Mount the new wallplate using the included screws
and anchors.
6Mount Wallplate
M28345
Drill 3/16-in. holes for drywall
Drill 3/32-in. holes for plaster

7 69-2210EF—03
Simply match wire labels.
Remove metal jumper if
you have both Rand Rc
wires.
M27513
7Connect 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.

69-2210EF—03 8
Install two AA alkaline batteries.
M28346
Back of thermostat
8Install Batteries

9 69-2210EF—03
Install thermostat onto the wallplate on the wall.
M28347
9Install Thermostat onto Wallplate

69-2210EF—03 10
Turn the power back on to the heating/cooling system.
10 Turn Power Back On
M28098

11 69-2210EF—03
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 If your system type is...

Advanced Installation
System setup......................................................................13
Wiring..................................................................................21
Troubleshooting..................................................................22
Customer assistance .........................................................25
Limited warranty.................................................................26

RTH6400
13 69-2210EF—03
About your new thermostat
SETUP WIRING ASSISTANCE TROUBLESHOOTING
M28348
Press and hold the sand FAN buttons until the screen
changes (approximately 5 seconds).
System setup
SettingFunction
Done Next
1
0
M28349
Press s or tto change settings.
Press NEXT to advance
to next function.
Press DONE to exit
and save settings.

Advanced Installation Guide
69-2210EF—03 14
SETUPWIRINGASSISTANCETROUBLESHOOTING
Function 1: System type
Press the s or t button to select the type
of system you have in your home:
Done Next
1
0
M28350
Press to change setting.
When correct setting is
selected, press NEXT to
display next function.
M28351
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.)

RTH6400
15 69-2210EF—03
SETUP WIRING ASSISTANCE TROUBLESHOOTING
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.
Done Next
2
0
M28352
Press to change setting.
When correct setting is
selected, press NEXT to
display next function.
M28351
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).

Advanced Installation Guide
69-2210EF—03 16
SETUPWIRINGASSISTANCETROUBLESHOOTING
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.
Done Next
3
0
M28353
Press to change setting.
When correct setting is
selected, press NEXT to
display next function.
M28351
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).

RTH6400
17 69-2210EF—03
SETUP WIRING ASSISTANCE TROUBLESHOOTING
Function 5: Heating cycle rate
Press the s or t button to select your heating system
and optimize its operation:
NOTE: If Function 5 does not appear, please turn to the
next page to continue.
Done Next
5
5
M28354
5Gas or oil furnace: Use this setting if you have a
standard gas or oil furnace that is less than 90%
efficient.
9Electric furnace: Use this setting if you have any
type of electric heating system.
3Hot water or high-efficiency furnace: Use this
setting if you have a hot water system or a gas
furnace of greater than 90% efficiency.
1Gas/oil steam or gravity system: Use this setting
if you have a steam or gravity heat system.
Press to change setting.
When correct setting is
selected, press NEXT to
display next function.
M28351

Advanced Installation Guide
69-2210EF—03 18
SETUPWIRINGASSISTANCETROUBLESHOOTING
Function 12: Manual/Auto Changeover
Press the s or t button to select Manual or Auto
Changeover:
Done Next
12
0
M28355
NOTE: System maintains a minimum 3ºF
difference between heat and cool settings.
CAUTION: To avoid possible compressor
damage, set to option 0 if the outside
temperature drops below 50ºF (10ºC).
0Manual Changeover: (Heat/Off/Cool)
1Automatic Changeover: (Heat/Off/Cool/Auto)
Automatically turns on heat or cool based on room
temperatures.
Press to change setting.
When correct setting is
selected, press NEXT to
display next function.
M28351