Honeywell RTH4300B User manual

Installation
Guide
RTH4300B
Programmable Thermostat
69-1772EF

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://yourhome.honeywell.com
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.

1
Getting started
Installation tips...........................................2
Pre-installation checklist ...........................3
Old thermostat removal
Remove old thermostat.............................5
Identify and label wires..............................7
New thermostat installation
Wallplate mounting .................................. 10
Wire connections .....................................12
Battery installation...................................14
Set fan operation switch .........................15
Thermostat mounting ..............................16
System setup
How to change settings...........................17
Set system type .......................................18
Set heating cycle rate..............................19
Set temperature display ..........................20
Appendices
In case of difficulty...................................21
Customer assistance ............................... 23
Accessories.............................................. 23
1-year limited warranty............................24
Table of contents
RTH4300B Programmable Thermostat

Installation Guide
2
Installation is easy — even if you’ve never done it before!
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 9-16).
• Set your new thermostat to match your heating/cooling system
(see pages 17-20).
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).

RTH4300B Programmable Thermostat
3
Pre-installation checklist
Check to make sure your package includes the following items:
RTH4300B thermostat
(wallplate attached to back)
Operating manual
Wire labels
Wall anchors
and mounting
screws (2
each)
Quick
reference
card

Installation Guide
4
Pre-installation checklist
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

RTH4300B Programmable Thermostat
5
Remove 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.
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

Installation Guide
6
Did you purchase right thermostat? Count wires to check.
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.
Do you have 6 or more wires? If so, stop now.
You may have purchased the wrong replacement
thermostat.

RTH4300B Programmable Thermostat
7
Identify wires you will not use
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.
Do not use unconnected wires.
Do not use Cor C1 wire.

Installation Guide
8
Label 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!
IGNORE WIRE COLORS: Use only letter designations
to identify wire types.