Honeywell RTH7400 series User manual

RTH7400/RTH7500 Series
Programmable Thermostat
Quick Installation Guide
69-2487EF-01

69-2487EF—01 ii
Advanced Installation Guide
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
– This thermostat works with virtually all System
Types
– 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 69-2487EF—01
RTH7400/RTH7500 Series
1Turn Off Power to Heating/
Cooling System
M28097

69-2487EF—01 2
Advanced Installation Guide
Remove old thermostat but leave wallplate with
wires attached.
2Remove Old Thermostat
M28099
MERCURY NOTICE
Is there a sealed tube
containing mercury? If so,
see back cover for proper
disposal instructions.
Leave wallplate
in place
Old thermostat
Cover

3 69-2487EF—01
RTH7400/RTH7500 Series
Label the wires using the supplied wire labels as you
disconnect them.
3Label Wires with Tags
Wire Labels
M28100
M28093
NOTE: Jumper wire used on old thermostat? If yes, note
what letters the jumper connected and review in wiring
section.

69-2487EF—01 4
Advanced Installation Guide
Remove wallplate from the new thermostat and mount
onto wall.
M28073
4Separate Wallplate from
New Thermostat
Wallplate

5 69-2487EF—01
RTH7400/RTH7500 Series
Mount the new wallplate using the included screws
and anchors.
5Mount Wallplate
M28094
Drill 3/32-in. holes for plaster
Drill 3/16-in. holes for drywall
Use hammer to tap the anchors into the wall.

69-2487EF—01 6
Advanced Installation Guide
Simply match wire labels.
Remove metal jumper if you have both Rand Rc wires.
MCR28845
W2
Y2
C
G
Y
W
RC
R
LABELED WIRES
SCREW
CONVENTIONAL
INSERT WIRES
THEN TIGHTEN SCREWS
WIRE HOLE
Y
G
R
W
CONVENTIONAL
6Connect Wires
Labels don’t match? See page 21.
Have a Heat Pump system? See pages 22–23.
We are here to help.
Call 1-800-468-1502 for wiring assistance.

7 69-2487EF—01
RTH7400/RTH7500 Series
Install two AA alkaline batteries and remove tab.
M28101
Back of thermostat
Remove tab.
M28102
7Install Batteries

69-2487EF—01 8
Advanced Installation Guide
Install thermostat onto the wallplate on the wall.
M28103
8Install Thermostat onto Wallplate

9 69-2487EF—01
RTH7400/RTH7500 Series
Turn the power back on to the heating/cooling system.
9Turn Power Back On
M28098

69-2487EF—01 10
Advanced Installation Guide
Go Back Next Done
6
15
2006
M28095
Month Year Day
10 Set Time and Date
Press sor tto set month, then press NEXT.
Press sor tto set day, then press NEXT.
Press sor tto set year, then press DONE.
Press sor tto set time, then press DONE to save and
exit.
Done
10:10
M28096

11 69-2487EF—01
RTH7400/RTH7500 Series
If your system type is:
q Single Stage Heat and Cool
Congratulations, you’re done!
If your system type is:
q Multistage Heat and Cool
q Heat Pump* without Backup Heat
q Heat Pump* with Backup Heat
q Heat Only
q Cool Only
Continue with advanced installation
on next page to match your thermostat to your sytem 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 120/240 Volt systems.
11 If your system type is...

Advanced Installation
System setup......................................................................13
Wiring..................................................................................21
Troubleshooting..................................................................24
Customer assistance .........................................................26
Limited warranty.................................................................27

RTH7400/RTH7500 Series
13 69-2487EF—01
About your new thermostat
SETUP WIRING ASSISTANCE TROUBLESHOOTING
System & Fan ScheduleClock & More
20
0120
M27459
SystemFan Done
20
0120
M28069
Step 1
Press and release the left button.
Step 2
Press and hold the center button until the screen
changes (approximately 5 seconds).
System setup

Advanced Installation Guide
69-2487EF—01 14
About your new thermostat
SETUPWIRINGASSISTANCETROUBLESHOOTING
Go Back Next Done
20
0120
Function Setting
Press s t to change setting.
NOTE: Some functions in the following pages
may not appear due to previous selections
made.
Press NEXT to advance to
next function.
Use this navigation to set and change settings on
pages 15-20.
Press DONE to save &
exit.
Navigating setting changes

RTH7400/RTH7500 Series
15 69-2487EF—01
About your new thermostat
SETUP WIRING ASSISTANCE TROUBLESHOOTING
NOTE: If you set the time and date as shown on
page 10, press NEXT to function 0170 and go to
page 16.
See page 14 to navigate between functions.
Function Settings & Options
0120 Year Setting
(rst two
digits)
Press s/t to change the rst two
digits of the year:
20 = Year 20xx
21 = Year 21xx
Press NEXT
0130 Year Setting
(second two
digits)
Press s/tto change the last two
digits of the year:
01 - 99 (i.e., 2001 - 2099)
Press NEXT
0140 Month Setting Press s/t to change the current
month:
01 - 12 (i.e., January - December)
Press NEXT
0150 Date Setting Press s/tto change the current
date:
01 - 31
Press NEXT
System setup

Advanced Installation Guide
69-2487EF—01 16
About your new thermostat
SETUPWIRINGASSISTANCETROUBLESHOOTING
See page 14 to navigate between functions.
Function Settings & Options
0170 Select System
Type Press s/t to select your system
type:
1 Heat/cool: Gas, oil or electric
heating with central air condi-
tioning.
2 Heat pump: Heat pump with-
out backup or auxiliary heat.
3 Heat only: Gas, oil or electric
heat without central air condi-
tioning.
4 Heat only with fan: Gas, oil or
electric heat without central air
conditioning.
5 Hot water heat only (no fan):
Gas, oil or hot water heat with-
out central air conditioning.
6 Cool only: Central air condi-
tioning only.
7 Heat pump: Heat pump with
backup or auxiliary heating.
8 Heat/Cool Multiple stages:
2 heat stages (wires on Wand
W2), 2 cooling stages (wires on
Yand Y2).
9 Heat/Cool Multiple stages:
2 heat stages (wires on Wand
W2), 1 cooling stage (wire on
Y).
10 Heat/Cool Multiple stages: 1
heat stage (wire on W), 2 cool-
ing stages (wires on Yand Y2).
Press NEXT
System setup

RTH7400/RTH7500 Series
17 69-2487EF—01
About your new thermostat
SETUP WIRING ASSISTANCE TROUBLESHOOTING
See page 14 to navigate between functions.
Function Settings & Options
0180 Heating Fan
Control Press s/t to select your heating
system & fan control:
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 NEXT
0190 Heat Pump
Changeover
Valve (for heat
pumps only)
Press s/t to select whether your
changeover valve is used in heating
or cooling:
0 Cooling changeover valve:
Use this setting if you con-
nected a wire labeled “O” to
the O/B terminal (see page 22).
1 Heating changeover valve:
Use this setting if you con-
nected a wire labeled “B” to the
O/B terminal (see page 23).
Press NEXT
System setup
NOTE: Some functions in the following pages
may not appear due to previous selections
made.

Advanced Installation Guide
69-2487EF—01 18
About your new thermostat
SETUPWIRINGASSISTANCETROUBLESHOOTING
See page 14 to navigate between functions.
Function Settings & Options
0240 Heating Cycle
Rate Press s/t to select your heating
system:
5 Gas or oil furnace: Standard
gas/oil furnace (less than 90%
efficiency).
9 Electric furnace: Electric
heating systems.
3 Hot water or high-efficiency
furnace: Hot water system or
gas furnace (more than 90%
efficiency).
1 Gas/oil steam or gravity
system: Steam or gravity heat
systems.
Press NEXT
0270 Emergency
Heat Cycle
Rate (heat
pumps only)
Press s/t to select your heating
system:
9 Electric furnace: Electric
heating systems.
5 Gas or oil furnace: Standard
gas/oil furnace (less than 90%
efficiency).
3 Hot water or high-efficiency
furnace: Hot water system or
gas furnace (more than 90%
efficiency).
1 Gas/oil steam or gravity
system: Steam or gravity heat
systems.
Press NEXT
System setup
NOTE: Some functions in the following pages
may not appear due to previous selections
made.