Honeywell RTH3100C User manual

Installation
Guide
RTH3100C
Non-Programmable Digital Thermostat
69-1889EF-1

Read and save these instructions.
® U.S. Registered Trademark. Patents pending.
Copyright © 2006 Honeywell International Inc. All rights reserved.
Need Help?
For assistance with this product please visit http://yourhome.honeywell.com
or call Honeywell Customer Care toll-free at 1-800-468-1502
CAUTION: ELECTRICAL HAZARD
Turn off power at the furnace or the fuse/circuit breaker panel before you begin.
MERCURY NOTICE
If this product is replacing a control that contains mercury in a sealed tube, do not
place the old control in the trash. Contact your local waste management authority for
instructions regarding recycling and proper disposal.

RTH3100C
1
Getting started
Installation tips...........................................2
Pre-installation checklist ...........................3
Old thermostat removal
Remove old thermostat.............................5
Identify and label wires..............................6
New thermostat installation
Wallplate mounting .................................... 8
Wire connections .....................................11
Battery installation...................................13
Thermostat mounting ..............................14
System setup
How to change settings...........................15
Set auxiliary heat cycle rate....................16
Set emergency heat cycle rate ...............17
Set temperature display ..........................18
Appendices
In case of difficulty...................................19
Customer assistance ............................... 21
Accessories.............................................. 21
1-year limited warranty............................22
Table of contents

Installation Guide
2
Your new thermostat has been designed for fast, easy installation. Just follow the
simple, step-by-step instructions in the following pages.
Install in three simple steps
• Label wires and remove your old thermostat (see pages 5-7).
• Install and wire your new thermostat (see pages 8-14).
• Set your new thermostat to match your heating/cooling system
(see pages 15-18).
Installation tips
• Have everything you need ready to go before you begin (see pages 3-4).
• Do not use wire color as a guide. Use wire labels instead (see page 7).
Installation is easy — even if you’ve never done it before!

RTH3100C
3
About your new thermostat
RTH3100C thermostat
(wallplate attached to back)
Operating Manual
Wall anchors and
mounting screws
(2 each)
Wire Labels
Check to make sure your package includes the following items:
Pre-installation checklist

Installation Guide
4
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
Pre-installation checklist

RTH3100C
5
1. Turn off power at heating/cooling system (or fuse/circuit-breaker panel).
2. Remove cover and thermostat, but leave wallplate with wires attached.
Remove your old thermostat
Leave wallplate in place.
Old thermostat
Cover
Is there a sealed tube containing mercury?
If so, see inside front cover of this manual
for proper disposal instructions.

Installation Guide
6
Do not use unconnected wires.
If any wires are not attached to terminals in your old thermostat, do not connect them
to your new thermostat.
Wrap the bare metal ends of each unused wire with electrical tape, so it cannot touch
and short out other wires.
Identify wires you will not use

RTH3100C
7
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.
Label wires and remove old wallplate
Wrap supplied labels securely around each wire.
Do not let wires fall into wall opening!
E
O
Aux
IGNORE WIRE COLORS:
Use only letter designations to identify wire types.

Installation Guide
8
PULL HERE
HIPS
Pull at bottom to remove thermostat from wallplate.
Remove wallplate
Wallplate