Honeywell RTH4300B User Manual

RTH4300B

69-1772EF

Programmable Thermostat

Installation Guide

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.

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

Read and save these instructions.

® U.S. Registered Trademark. Patents pending.

Table of contents

RTH4300B Programmable Thermostat

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

Installation Guide

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

Pre-installation checklist

Check to make sure your package includes the following items:

RTH4300B thermostat

(wallplate attached to back)

Quick

reference

card

Operating manual

Wall anchors

and mounting

screws (2

each)

Wire labels

Installation Guide

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

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.

Leave wallplate in place

Is there a sealed tube containing mercury?

If so, see inside front cover of this manual

for proper disposal instructions.

Old thermostat

Cover

Installation Guide

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 C or 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

Identify wires you will

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.

not

use

Do not use C or C1 wire.

Installation Guide

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.

RTH4300B Programmable Thermostat

PULL HERE

HIPS

Remove wallplate and install quick reference card

Pull at bottom to remove thermostat from wallplate.

Wallplate Thermostat

Insert quick reference card after wallplate is mounted (see mounting instructions on page 11).

Installation Guide

Mark wallplate mounting position

1. Pull wires through wallplate.

2. Level wallplate if desired (lay level across tabs).

3. Mark positions of both screw holes.

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.

RTH4300B Programmable Thermostat

Installation Guide

Connect wires (typical installation)

1. Match each labeled wire with same letter on terminal.

2. Use a screwdriver to loosen screw terminals, insert wires, then tighten screws.

3. Push any excess wire back into the wall opening.

Labels don’t match?

If labels do not match letters on thermostat, see next page.

Remove metal jumper if you have both R and Rc wires.

RTH4300B Programmable Thermostat

Connect wires (less common wire designations)

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

R and Rc terminals, remove metal jumper (see page 12).

Do not use C, X, or B. Wrap bare

end of wire with electrical tape.

Do not connect both O and B

if you have a heat pump. Connect O wire to O. Wrap B wire with electrical tape and do not use.

Installation Guide

Install batteries

Install two fresh AA 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

About your new thermostatSet fan operation switch

Move the switch to the proper setting: F: For gas or oil heating systems, leave

the fan operation switch in this factory-set position (for systems that control the fan in a call for heat).

E: Change the switch to this setting for heat pump or electric heat systems. (This setting is for systems that allow the thermostat to control the fan in a call for heat, if a fan wire is connected to the G terminal.)

RTH4300B Programmable Thermostat

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