Honeywell RTH7400 series User manual

Installation
Guide
RTH7000 Series
Programmable Thermostat
69-2104ES-01

Read and save these instructions.
MERCURY NOTICE: Do not place your old thermostat in the trash if it contains
mercury in a sealed tube. Contact your local waste management authority for
instructions regarding recycling and proper disposal.
Need Help?
For assistance with this product please visit http://DIYthermostats.honeywell.com
or call Honeywell Customer Care toll-free at 1-866-228-8942
® U.S. Registered Trademark. Patents pending.
Copyright © 2007 Honeywell International Inc. All rights reserved.
This thermostat provides control of 24 VAC heating and cooling systems, or
750mV heating systems.
This manual covers RTH7400 and RTH7500 models.
(Pull thermostat from wallplate and turn over to find model number)
This thermostat contains a Lithium battery which may contain Perchlorate material.
Perchlorate Material—special handling may apply,
See www.dtsc.ca.gov/hazardouswaste/perchlorate

RTH7400/RTH7500
1 69-2104ES—01
Getting started
Installation tips........................................... 2
Pre-installation checklist ........................... 3
Old thermostat removal
Remove old thermostat.............................4
Identify and label wires..............................5
New thermostat installation
Wallplate mounting ....................................6
Wire connections ....................................... 9
Battery installation................................... 13
Thermostat mounting ..............................14
Time/date settings ...................................15
System setup
How to enter system setup .....................16
How to change settings...........................17
System settings ..................................18-24
Appendices
Customer assistance ...............................25
In case of difficulty...................................26
1-year limited warranty............................28
Table of contents

Installation Guide
69-2104ES—01 2
Installation is easy—even if you’ve never done it before!
Your new thermostat has been designed for fast, easy installation.
Install in three simple steps
• Label wires and remove your old thermostat (see pages 4-5).
• Install and wire your new thermostat (see pages 6-14).
• Set your new thermostat to match your heating/cooling system
(see pages 15-24).
Installation tips
• Have everything you need ready to go before you begin (see page 3).
• Do not use wire color as a guide. Use wire labels instead (see page 7).
If you have installation questions, call 1-866-228-8942.
TURN OFF POWER at heating/cooling system (or fuse/circuit-breaker panel) before you
begin installation.

RTH7400/RTH7500
3 69-2104ES—01
M28071
Pre-installation checklist
RTH7400/RTH7500 thermostat
(wallplate attached to back)
Wire labelsWall anchors and
mounting screws (2 each)
Operating manual
Note: Remove wallplate from the thermostat and see the label on the
back of the thermostat for model number.
Required tools & supplies
• No. 2 Phillips screwdriver
• Small pocket screwdriver
• Drill
• Drill bit (3/16” for drywall,
7/32” for plaster)
• Hammer
• Pencil
• Electrical tape
• Level (optional)
• Two fresh AA alkaline batteries
Make sure this package includes:

Installation Guide
69-2104ES—01 4
About your new thermostatRemove your old thermostat
1. Turn off power at heating/cooling system (or fuse/circuit-breaker panel).
2. Remove cover and thermostat, but leave wallplate with wires attached.
M28099
Is there a sealed tube containing mercury?
If so, see inside front cover of this manual
for proper disposal instructions.
Old thermostat
Cover
Leave wallplate in place

RTH7400/RTH7500
5 69-2104ES—01
About your new thermostatLabel wires and remove old wallplate
Use a screwdriver to disconnect wires one by one. As you disconnect each wire,
wrap it with the label matching the letter on your old thermostat. (Adhesive labels are
supplied in your thermostat package.)
Remove the old wallplate only after all wires are labeled. Be careful not to let loose
wires fall into the wall opening.
Wrap supplied labels securely around each wire
Do not let wires fall into wall opening!
M28072
IGNORE WIRE COLORS: Use only letter designations to
identify wire types.

Installation Guide
69-2104ES—01 6
About your new thermostatRemove wallplate from new thermostat
Grasp top and bottom of wallplate and pull to remove from your new thermostat.
M28073
Wallplate

RTH7400/RTH7500
7 69-2104ES—01
About your new thermostatMark wallplate mounting position
1. Pull wires through
wallplate.
2. Level wallplate if desired. 3. Mark positions of
both screw holes.
M28074

Installation Guide
69-2104ES—01 8
About your new thermostatMount wallplate
1. Drill holes at pencil-marked locations:
3/16” holes for drywall
7/32” holes for plaster.
2. Use hammer to tap
anchors into holes until
flush with wall.
3. Place wallplate over
anchors and insert screws.
Check level if desired,
then tighten screws.
M28075