Honeywell RTH8500D User Manual

RTH8500D Touch Screen

Programmable Thermostat

OWNER’S GUIDE

The RTH8500D 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.

Read and Save these Instructions

or call Honeywell Customer Care

U.S. Pat. 6,595,430
Other Patents Pending
® U.S. Registered Trademark
© 2004 Honeywell International Inc.
All Rights Reserved

69-1725-1

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 .............................................................................. 22

Attach New Thermostat to Wallplate..............................................23

Set the Calendar............................................................................ 24

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

Get to Know Your Thermostat Display...........................................38

Set System Setting ........................................................................ 40

Program Your Heating and Cooling Schedule ............................... 42

Cancel a Schedule Period ............................................................. 46

Set Time ........................................................................................ 47

Set Temperature Overrides............................................................ 48

Clean Your Thermostat Screen ..................................................... 51

Use Your Filter Timer..................................................................... 52

Understanding Temperature Recovery Feature............................. 53

Replace Batteries ..........................................................................54

Review Battery Tips....................................................................... 57

Built-in Compressor Protection...................................................... 58

Troubleshooting Tips ..................................................................... 59

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

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

69-1725-1 2

Step 1. Prepare for Installation

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.

69-0823EFS

y
ourhome

G

R

B

G

R

2

C

2

C

C

C

EOEOF

U

3

F

U

3

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e

1. Check that the following items are included:

I

n

s

i

d

e

S

e

t

WALLPLATE

THERMOSTAT

MOUNTING SCREWS (2)
AND WALL ANCHORS (2)

OWNER'S GUIDE

WIRE LABELS

CAUTION CARD

OWNER'S GUIDE

Inside

Set To

Read and save these instructions

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

de la letra correspondiente d

Y

R

V/V

V/V

5-03

Y

R

W

W

M222

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.

3 69-1725-1

Step 1. Prepare for Installation (Cont)

2. Check that you have everything required for the installation:

• Three AAA 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

69-1725-1 4

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

R

RED

W

!

DO NOT WIRE

NEW THERMOSTAT

BASED ON

WIRE COLOR.

M22034

G

GREEN

RC

Y

ORANGE

5 69-1725-1

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 wallplate. Do not

remove the wires.

OLD THERMOSTAT

WALLPLATE

Y

G

C

W

THERMOSTAT

R

.1

8

.2

.9
.7
.5

L

O

N

R

.4

G

E

.25

.3

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.

69-1725-1 6

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

Y

W

G

C

LETTER
DESIGNATION

SCREW
TERMINAL

WIRE

R

C

DO NOT CONNECT TO NEW
THERMOSTAT

7 69-1725-1

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.

Visit www.honeywell.com/yourhome

or call Honeywell
Customer Care at 1-800-468-1502 before returning the
thermostat to the store.

OLD THERMOSTAT

Y

W

G

LETTER
DESIGNATION

SCREW
TERMINAL

WIRE

R

C

CONNECT TO THE "C" ON THE
NEW THERMOSTAT

WIRE HOLE

M22223

69-1725-1 8

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

Y

W

G

R

R

C

LETTER DESIGNATION

SCREW TERMINAL

WIRE

WIRE HOLE

WIRES NOT CONNECTED –
DO NOT CONNECT TO
NEW THERMOSTAT

M22040

9 69-1725-1

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

Y

W

Y

G

G

RC

W

R

WIRE LABEL

LETTER
DESIGNATION

SCREW
TERMINAL

WIRE

R

C

R

WIRE HOLE

M22039

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.

69-1725-1 10

Step 6. Mount New Wallplate to Wall

1. Separate the wallplate from the thermostat as shown.

WALLPLATE

WIRE HOLE

THERMOSTAT

M22202

11 69-1725-1

Step 6. Mount New Wallplate to Wall (Cont)

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

WALL OPENING

WIRE HOLE

WALLPLATE

LABELED WIRES

69-1725-1 12

M22203

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
SUPPORT TABS

LEVEL

MARK
MOUNTING
HOLES (2)

WALLPLATE

M22204

13 69-1725-1

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

WALL
ANCHORS (2)

M22205

MOUNTING
SCREWS (2)

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.

69-1725-1 14

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.

METAL JUMPER WIRE

TERMINAL BLOCK

SCREW TERMINALS

LETTER
DESIGNATIONS

WALLPLATE

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.

RC

R

W

Y

G

C

M22206

See table on page 29 to help you determine if you have a
CONVENTIONAL or HEAT PUMP system.

15 69-1725-1

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

LETTER

WALLPLATE

WIRE HOLE

INSERT WIRE IN HOLE

RC

R

W

Y

G

DESIGNATIONS

RC

R

W

Y

G

C (NOT USED)

M22207

69-1725-1 16

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

1

RC

1

R

W

Y

G

C

Y2

W2

Possible letter

designations on

the labeled wires

or R

RC

or RH, 4, V

R

or W1, H

W

or Y1, M

Y

or F

G

or C1, X, B

C

Y2

W2

2

2

3

M22208

4

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.

17 69-1725-1

Step 7. Connect Wires to New Wallplate (Cont)

NOTES FOR CONVENTIONAL HEATING AND COOLING SYSTEMS

1

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

2

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

3

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.

4

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

69-1725-1 18

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

1

RC

R

O/B

Y

G

C

L

E

AUX

M22210

2

3

3

4

AUX, W1, W or

Possible letter

designations on

the labeled wires

VR or V or

Y1 or M or

H or B,

F or

X or B,

F or

X2 or X,

R

O

Y

G

C

L

E

W2

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

19 69-1725-1

Step 7. Connect Wires to New Wallplate (Cont)

NOTES FOR HEAT PUMP SYSTEMS

1

Leave metal jumper wire between RC and R in place.

2

If the old thermostat had separate wires on both the V and VR,
some system modification is required. Call your local heating
and cooling contractor for assistance.

If the old thermostat had wires on both O and B, be sure to

3

attach the B wire to the C letter designation on the new
thermostat. If another wire is already matched to the C, contact
Honeywell.

If the old thermostat had wires on W1, Y1 and W2, some

4

system modification is required. Call your local heating and
cooling contractor for assistance.

M22245

69-1725-1 20