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