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

RTH5100B
9
Pull here to remove wallplate
from new thermostat.
Remove battery holder.
Wallplate
Remove wallplate

Installation Guide
10
1. Pull wires
through
wallplate.
2. Level wallplate if desired
(lay level across tabs).
3. Mark positions of
both screw holes.
Mark wallplate mounting position

RTH5100B
11
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.
Mount wallplate

Installation Guide
12
Remove metal
jumper if you
have both R
and Rc wires.
Labels don’t match?
If labels do not match letters
on thermostat, see next page.
1. Match each labeled wire with same letter on terminal.
2. Use a screwdriver to
loosen screw term-
inals, insert wires,
then tighten screws.
3. Push any excess
wire back into the
wall opening.
Connect wires (typical installation)

RTH5100B
13
If labels do not match letters on the thermostat, check the chart at
right and connect to terminal as shown here (see notes, below).
If wires will be connected to
both Rand Rc terminals,
remove metal jumper
(see page 12).
Do not connect both Oand
B if you have a heat pump.
Connect Owire to O/B W.
Wrap Bwire with electrical
tape and do not use.
Do not use C, Xor B. Wrap
bare end of wire with
electrical tape.
Connect wires (less common wire designations)

Installation Guide
14
Install two fresh AAA alkaline
batteries in back of thermostat.
After installation, batteries can
be changed without removing
the thermostat from the wall
(see Operating Manual for more
information).
Back of thermostat
Install batteries

RTH5100B
15
TIP: If wires interfere when you
try to mount the thermostat,
push excess wire back into the
wall opening.
Thermostat
Wallplate
1. Align the 4 tabs on the wallplate with corresponding slots on the
back of the thermostat, then push
gently until the thermostat
snaps into place.
2. Restore electrical power
at the heating/cooling
system, or at the
fuse/circuit-breaker panel.
Mount thermostat and restore electrical power

Installation Guide
16
Next
1
0
Done
Function
number
Setting
To begin, press and hold the s
and FAN buttons until the display
changes.
Press s or tto change settings.
Press NEXT to advance to next function.
Press DONE to exit and save settings.
Next, you must set the thermostat to control the heating and cooling
system in your home. Press and hold the s and FAN buttons to enter
system setup.
System setup (set thermostat to match your system)

RTH5100B
17
Next
1
0
Done
Press to change
setting. When
correct setting is
selected, press
NEXT to display
next function.
Press the s or t button to select the type of
climate control system you have in your home:
0Heating & cooling: Gas, oil or electric
heating with central air conditioning.
1Heat pump: Outside compressor
provides both heating and cooling.
2Heating only: Gas, oil or electric heating
without central air conditioning.
3Heating only with fan: Gas, oil or
electric heating without central air
conditioning. (Use this setting if you
could turn the fan on and off with a fan
switch on your old thermostat.)
Function 1: System type

Installation Guide
18
NOTE: If Function 2 does not
appear, please turn to the next
page to continue.
Next
2
0
Done
Press to change
setting. When
correct setting is
selected, press
NEXT to display
next function.
Press the s or t button to select whether
your changeover valve is used in heating or
cooling:
0Cooling changeover valve: Use this
setting if you connected a wire labeled
“O” to the O/B W wire terminal (see
page 13).
1Heating changeover valve: Use this
setting if you connected a wire labeled
“B” to the O/B W wire terminal (see
page 13).
Function 2: Heat pump changeover valve