Honeywell RTH7400D User manual

OWNER’S GUIDE

Patents Pending

® U.S. Registered Trademark

RTH7400D

Programmable Thermostat

The RTH7400D Thermostat provides electronic control of 24 Vac

heating and cooling systems or 750 mV heating systems.

For assistance with your Honeywell product, please visit

www.honeywell.com/yourhome or call Honeywell Customer Care

toll free at 1-800-468-1502.

Read and Save these Instructions

69-1726—1 2

Contents

Prepare for Installation ............................................................ 3

Follow Important Instructions .................................................. 5

Remove Old Thermostat ......................................................... 6

Follow Special Instructions...................................................... 7

Label Old Thermostat Wires ................................................... 10

Mount New Wallplate to Wall .................................................. 11

Connect Wires to New Wallplate............................................. 15

Install Batteries........................................................................ 23

Attach New Thermostat to Wallplate ....................................... 24

Configure Installer Setup......................................................... 26

Customer Assistance .............................................................. 62

Limited One-Year Warranty ..................................................... 63

3 69-1726—1

Step 1. Prepare for Installation

1. Check that the following items are included:

If any of the items shown above are missing, call

Honeywell Customer Care at 1-800-468-1502

before returning the thermostat to the store.

CAUTION

TURN OFF POWER to system at the furnace, or at the fuse/circuit

breaker panel before you begin.

Match the letter of

our old thermostat wire with the terminal of th

correspondin

letter on

our new thermostat or base

ll.

WALLPLATE

THERMOSTAT

M2227

MOUNTING SCREWS (2)

AND WALL ANCHORS (2)

OWNER'S GUIDE

CAUTION CARD

WIRE LABELS

ead

ese

OWNER'S GUIDE

fusibles-interru

tor

69-1726—1 4

Step 1. Prepare for Installation (Cont)

2. Check that you have everything required for the

installation:

• Two AA alkaline batteries

• No. 2 Phillips screwdriver and standard pocket

screwdriver

•Drill

• Drill bit—use 3/16 in. for drywall; use 7/32 in. for

plaster

• Level (optional)

• Hammer

•Pencil

• Electrical tape

5 69-1726—1

Step 2. Follow Important Instructions

1. Do not connect the wires to the new thermostat

based on wire color because damage can occur to

the heating and/or cooling system.

These Installation Instructions explain later how to

use the enclosed wire labels to correctly mark the

wires connected to your old thermostat.

M22034

OLD THERMOSTAT

RED

WHITE

YELLOW

ORANGE

GREEN

DO NOT WIRE

NEW THERMOSTAT

BASED ON

WIRE COLOR.

69-1726—1 6

Step 3. Remove Old Thermostat

1. Turn off power at the heating and/or cooling system

or fuse/circuit breaker panel.

2. Remove the cover from the old thermostat.

3. Remove the old thermostat from the wall or wall-

plate. Do not remove the wires.

MERCURY NOTICE

If you are replacing a thermostat that contains mercury

in a sealed tube, do not place your old thermostat in the

trash.

Contact your local waste management authority for

instructions regarding recycling and the proper disposal

of an old thermostat containing mercury in a sealed

tube.

OLD THERMOSTAT

.25 .3

THERMOSTAT

COVER

WALLPLATE

M22036

7 69-1726—1

Step 4. Follow Special Instructions

1. If you have two C and/or C1 wires connected to

your old thermostat, do not connect them to your

new thermostat.

2. Disconnect the C and/or C1 wires. Make sure they

do not touch each other or any other wires.

3. Wrap the bare end of each C and/or C1 wire with

electrical tape.

OLD THERMOSTAT

WIRE HOLE

M22201

DO NOT CONNECT TO NEW

THERMOSTAT

WIRE

SCREW

TERMINAL

LETTER

DESIGNATION

69-1726—1 8

Step 4. Follow Special Instructions (Cont)

4. If you have only one C and/or C1 wire connected to

your old thermostat, connect this wire to C on the

new thermostat.

OLD THERMOSTAT

WIRE HOLE

M22223

CONNECT TO THE "C" ON THE

NEW THERMOSTAT

WIRE

SCREW

TERMINAL

LETTER

DESIGNATION

9 69-1726—1

Step 4. Follow Special Instructions (Cont)

5. If you find any wires not connected to your old

thermostat, do not connect them to your new

thermostat.

6. Wrap the end of the wires that are not connected

with electrical tape.

OLD THERMOSTAT

WIRE HOLE

WIRES NOT CONNECTED –

DO NOT CONNECT TO

NEW THERMOSTAT M22040

WIRE

SCREW TERMINAL

LETTER DESIGNATION

69-1726—1 10

Step 5. Label Old Thermostat Wires

1. As you disconnect each wire, use the enclosed wire

labels to wrap a wire label around each wire that

matches the letter designation. Do not allow the

wires to fall into the wall opening after the wires are

disconnected.

2. Remove any remaining part of the old thermostat

from the wall.

When connecting the wires to the new

thermostat, refer to the wire labels. Do not

connect wires to your new thermostat based on

the color of the wire.

OLD THERMOSTAT

WIRE HOLE

M22039

WIRE

SCREW

TERMINAL

LETTER

DESIGNATION

WIRE LABEL

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