Honeywell RTH7400D User Manual

RTH7400D

Programmable Thermostat

OWNER’S GUIDE

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 toll free at 1-800-468-1502.

or call Honeywell Customer Care

Read and Save these Instructions

69-1726-1

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

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Step 1. Prepare for Installation

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1. Check that the following items are included:

WALLPLATE

THERMOSTAT

MOUNTING SCREWS (2) AND WALL ANCHORS (2)

OWNER'S GUIDE

WIRE LABELS

CAUTION CARD

OWNER'S GUIDE

instruction

CAUTION

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

breaker panel before you begin.

Match the letter of your old thermostat wire with the terminal of th

corresponding letter on your new thermostat or base

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V/V

ll.com

M2227

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.

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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

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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.

OLD THERMOSTAT

YELLOW

WHITE

RED

NEW THERMOSTAT

DO NOT WIRE

BASED ON

WIRE COLOR.

M22034

GREEN

ORANGE

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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.

OLD THERMOSTAT

WALLPLATE

THERMOSTAT

.7 .5

.25

COVER

M22036

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.

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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

LETTER DESIGNATION

SCREW TERMINAL

WIRE

DO NOT CONNECT TO NEW THERMOSTAT

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WIRE HOLE

M22201

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

CONNECT TO THE "C" ON THE NEW THERMOSTAT

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LETTER DESIGNATION

SCREW TERMINAL

WIRE

WIRE HOLE

M22223

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

LETTER DESIGNATION

SCREW TERMINAL

WIRE

WIRE HOLE

WIRES NOT CONNECTED – DO NOT CONNECT TO NEW THERMOSTAT

M22040

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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.

OLD THERMOSTAT

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.

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WIRE LABEL

LETTER DESIGNATION

SCREW TERMINAL

WIRE

WIRE HOLE

M22039

Step 6. Mount New Wallplate to Wall

1. Separate the wallplate from the thermostat as

shown.

WALLPLATE

WIRE HOLE

THERMOSTAT

M22267

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Step 6. Mount New Wallplate to Wall (Cont)

2. Pass the labeled wires through the wire hole on the

wallplate.

WALL OPENING

WIRE HOLE

PLATE

WAL

LABELED WIRES

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M22279

Step 6. Mount New Wallplate to Wall (Cont)

3. Position the wallplate on the wall with the arrow

pointing up. Level the wallplate (for appearance only) and mark the two mounting holes with a pencil.

PLACE LEVEL ON

LEVEL

WALLPLATE

M22292

SUPPORT TABS

MARK MOUNTING HOLES (2)

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Step 6. Mount New Wallplate to Wall (Cont)

4. Move the wallplate aside and drill holes at the

locations marked on the wall. Drill 3/16 in. holes for drywall or 7/32 in. holes for plaster.

5. Tap the wall anchors into the drilled holes until even

with the wall surface.

DRILLED HOLES (2)

WALLPLATE

M22293

6. Position the wallplate over the wall anchors.

7. Insert the mounting screws into the wall anchors.

Check leveling, if desired, and tighten the mounting screws.

WALL ANCHORS (2)

MOUNTING SCREWS (2)

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Step 7. Connect Wires to New Wallplate

1. Match the labeled wires to the letter designations

on the wallplate.

2. Select the correct letter designations to follow for

your system. If you have a standard heating and/or cooling system, use the CONVENTIONAL letter designations. If you have a heat pump system, use the HEAT PUMP letter designations to wire the new thermostat.

M22294

See table on page 30 to help you determine if you have a CONVENTIONAL or HEAT PUMP system.

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Step 7. Connect Wires to New Wallplate (Cont)

3. If wires are to be connected to both Rc and R,

loosen the Rc and R screw terminals and remove the metal jumper wire.

4. If only one of the terminals, Rc or R, is to be

connected, leave the metal jumper wire in place.

TERMINAL BLOCK

SCREW TERMINALS

LETTER DESIGNATIONS

O/B

WALLPLATE

METAL JUMPER WIRE

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M22295

Step 7. Connect Wires to New Wallplate (Cont)

5. Loosen the screw terminals. Insert the labeled

wires into the holes on the side of the terminal block that match the letter designations. Tighten the screw terminals.

6. If any of the labeled wires do not match the letter

designations, see next page for wire connections.

LABELED WIRES

TERMINAL BLOCK

SCREW TERMINALS

CONVENTIONAL LETTER DESIGNATIONS

C R

INSERT WIRE IN HOLE

WALLPLATE

WIRE HOLE

M22325

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Step 7. Connect Wires to New Wallplate (Cont)

7. Compare letter designations on your old and new

thermostats. Use the information below if you are wiring a CONVENTIONAL System. Use the information on page 20 if you are wiring a Heat Pump system.

CONVENTIONAL letter designations

on the new thermostat

Do not connect more than one wire to each terminal. Be sure to read the notes referenced in the numbered triangles above. These numbered notes appear on the next page.

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Possible letter

designations on

the labeled wires

or R

or RH, 4, V

or W1, H

or Y1, M

or F

or C1, X, B

M22208

Step 7. Connect Wires to New Wallplate (Cont)

NOTES FOR CONVENTIONAL HEATING AND COOLING SYSTEMS

If wires will be connected to both RC and R on the new thermostat, remove metal jumper wire between R wire in place if only one of the terminals, R on the new thermostat.

If wires were connected to both R and RH terminals on the old

thermostat, remove metal jumper wire between R new thermostat. Connect the old R to the new R to the new R.

If two C and/or C1 wires were connected to the old thermostat, do not connect them to the new thermostat. Wrap the bare end of each wire separately with electrical tape and do not use.

If one C and/or C1 wire was connected to the old thermostat, the wire should be connected to the "C" letter designation on the new thermostat.

C and R. Leave metal jumper

C or R, will be connected

C and R on the

C and the old RH

M22246

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Step 7. Connect Wires to New Wallplate (Cont)

8. Compare letter designations on your old and new

thermostats. Use the information below if you are wiring a HEAT PUMP system.

HEAT PUMP letter

designations on the

new thermostat

O/B

AUX

M22210

AUX, W1, W or

Possible letter

designations on

the labeled wires

VR or V or

H or B,

Y1 or M or

F or

X or B,

F or

X2 or X,

Be sure to read the note referenced in the numbered triangles above. These numbered notes appear on the next page.

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