Honeywell RTH5100B User manual

Installation
Guide
RTH5100B
Non-Programmable Digital Thermostat
69-1926EF

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or call Honeywell Customer Care toll-free at 1-800-468-1502
® U.S. Registered Trademark. Patents pending.
Copyright © 2006 Honeywell International Inc. All rights reserved.
TURN OFF POWER at the heating/cooling system or the fuse/circuit
breaker panel before you begin.
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.

RTH5100B
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 ......................9
Wire connections .......................12
Battery installation.....................14
Thermostat mounting ................15
System setup
How to change settings.............16
Set system type .........................17
Set changeover valve ................18
Set heating fan control ..............19
Set heating cycle rate................20
Set temperature display ............21
Appendices
In case of difficulty.....................22
Customer assistance .................25
Replacement parts.....................25
1-year limited warranty..............26
Table of contents

Installation Guide
22
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 5-8).
• Install and wire your new thermostat (see pages 9-15).
• Set your new thermostat to match your heating/cooling system
(see pages 16-21).
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 8).
Installation is easy—even if you’ve never done it before!

RTH5100B
3
RTH5100B thermostat
(wallplate attached to back)
Operating manual
Wire labels
Wall anchors and
mounting screws (2 each)
Operating
Manual
RTH5100B
Non-Pro grammab le Digit al Thermo stat
69-1927ES
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 AAA alkaline batteries
Pre-installation checklist

RTH5100B
5
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
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

Installation Guide
6
Do you have 6 or more wires? If so, stop
now. You may have purchased the wrong
replacement thermostat.
Count the number of wires coming out of the wall and attached to
terminals in your old thermostat. If any of them are attached to a
terminal marked “C” or “C1” do not count that wire in your total.
If the total (not counting Cor C1) is 5 wires or less, proceed to the
next page. If you have 6 or more wires, your new thermostat may
not be compatible with your system. Stop installation and call
1-800-468-1502 for advice.
Did you purchase right thermostat? Count wires to check.

RTH5100B
7
Do not use unconnected wires.
Do not use Cor C1 wire.
If any wires are not attached to terminals in your old thermostat, do
not connect them to your new thermostat.
If a wire is attached to a terminal marked “C” or “C1,” disconnect it.
You will not connect it 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

Installation Guide
8
Wrap supplied labels securely around each wire.
Do not let wires fall into wall opening!
IGNORE WIRE COLORS: Use only
letter designations to identify wire types.
Use a screwdriver to disconnect wires one by one. As you discon-
nect 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