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

e

.

69-0823EFS

y
ourhome

G

R

B

G

R

2

C

2

C

C

C

EOEOF

U

3

F

U

3

00

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

Step 7. Connect Wires to New Wallplate (Cont)

9. Push excess wire back into the wall opening. Keep wires in the

shaded area.

WIRE

WALL OPENING

SHADED AREA

WALLPLATE

M22211

21 69-1725-1

Step 8. Install Batteries

S

+

1. Install three fresh AAA alkaline batteries on the back of the
thermostat as marked on the thermostat.

BACK OF THERMOSTAT

BATTERIE

(3)

M22212

2. Remove the tab labeled “Remove during installation” in the
lower right corner of the thermostat back.

REMOVE
TAB

INSTALLATION

REMOVE DURING

69-1725-1 22

INSTALLATION

REMOVE DURING

M19920

Step 9. Attach New Thermostat to Wallplate

1. Align the screw blocks with the pins on the back of the

thermostat.

WALLPLATE

PINS ON
BACK OF

THERMOSTAT

TERMINAL
SCREW
BLOCK

M22213

2. Push the thermostat straight onto the wallplate until it snaps into
place.

3. Turn on the power at the heating and/or cooling system or fuse/
circuit breaker panel.

If the wires interfere with mounting the thermostat to the
wallplate, push the excess wire back into the wall opening.

23 69-1725-1

Step 10. Set the Calendar

E

MON

UE

THU

A

This thermostat is designed to automatically keep current time and
day in memory for up to ten years, under normal use, once the
calendar is set. When the thermostat is first powered, the display is
ready to set the calendar.

1. Use the arrow keys to set the year, month and day.

2. Press the Done key.

SET
CURRENT
DATE

SET
MONTH

T

USE

RROWS
TO SET
YEAR

The calendar can be set any time. See Step 11, Configure
Installer Setup, for instructions.

69-1725-1 24

DON

M22226

Step 10. Set the Calendar (Cont)

E

MON

THU

SA

A

3. Use the arrow keys to set the current time.

4. Press the Done key.

USE

RROWS
TO SET
TIME

DON

M22227

25 69-1725-1

Step 11. Configure Installer Setup

1. Use the Installer Setup Menu to match your new thermostat to

your heating and/or cooling system. Follow the steps in this
section to set up your thermostat.

2. Press and release the System key.

FAN

ON

Inside

AUTO

SYSTEM

EM HEAT

COOL

OFF

AM

SCHED HOLD CLOCK SCREEN

69-1725-1 26

THU

Set To

Following

Schedule

M22225

Step 11. Configure Installer Setup (Cont)

E

OFF

COOL

E

MON

THUSASUN

3. Press and hold the center blank key for approximately five
seconds, until the screen changes.

TUE

CHANGE FILTER UV LAMP HUMIDIFIER PAD

Inside

Set To

SYSTEM

EM HEAT

DON

Following

Schedule

PM

CANCEL

M19969

4. Release the center key when the display on your thermostat
matches the display below.

DON

M22214

27 69-1725-1

11. Configure Installer Setup (Cont)

SS TO

S

UP

E

5. Press the Up or Down arrows to the right of the two-digit
number in the lower right corner of the screen to select your
setting for Installer Setup Number 0120 below.

6. After you select your setting, press the Up arrow key to the right
of 0120 to go to the next Installer Setup Number.

7. Follow steps 5 and 6 to set Installer Setup Numbers 0130, 0140
and 0150 to complete setting the calendar.

ADVANCE
TO NEXT
INSTALLER
SETUP

INSTALLER
SETUP
NUMBER

PRE
IN

DON

EXIT

TALLER SET

FACTORY
SETTING

CHANGE THE
FACTORY
SETTING

Installer

Setup

Number

Installer

Setup
Name

0120 Date (Year

Upper)

0130

Date (Year

Lower)

0140

Date

(Month)

0150

Date

(Day)

69-1725-1 28

(Select Your Setting)

Settings

Select first two digits of current
calendar year (20 for year 2005, etc).

Select last two digits of current
calendar year (05 for year 2005, etc).

Select number that represents current
calendar month.

Select number that represents current
calendar date.

M22215

Step 11. Configure Installer Setup (Cont)

staller

PRESS TO EXIT

UP

E

8. Press the Up or Down arrows to select your setting for Installer
Setup Number 0170.

9. After you select your setting, press the Up arrow to go to the
next Installer Setup Number.

UP ARROW

INSTALLER
SETUP NUMBER

INSTALLER SET

Installer

Setup

Number

0170 System

In

Setup

Name

Type

Selection

SETTING

UP
ARROW

DOWN

DON

1 - Heating and Cooling (Conventional) -- Gas, oil or
electric heating with central air conditioning.

2 - Single-stage Heat Pump with no back-up or
auxiliary heat -- the compressor runs in both

heating and cooling.
3 - Heat Only with no fan (Conventional) -- Gas, oil
or electric heating without central air conditioning.
No wire on the G terminal on new thermostat.
4 - Heat Only with fan (Conventional) -- Gas, oil or
electric heating without central air conditioning.
Typically wires are R, W and G on new thermostat.
5 - Hot Water Heat Only (Conventional) -- Gas or Oil
hot water heat with three wires connected to new
thermostat or for normally open hot water valves
with wires connected to R and Y on new thermostat.
6 - Cool Only (Conventional) -- Central air
conditioning only.
7 - Multistage Heat Pumps -- heat pump with auxiliary
or back-up heat.
8 - Multistage Conventional Heating and Cooling --
2 stages of Heat (wires on W and W2) and 2 stages
of Cool (wires on Y and Y2).
9 - Multistage Conventional Heating and Cooling -­ 2 stages of heat (wires on W and W2) and 1 stage
of Cool (wire on Y).
10 - Multistage Conventional Heating and Cooling -­ 1 stage of heat (wire on W) and 2 stages of Cool
(wires on Y and Y2).

(Select Your Setting)

Settings

ARROW

M22216

29 69-1725-1

Step 11. Configure Installer Setup (Cont)

SS TO

S

UP

E

10. If you do not have a number 0180 on the left side of your
display, go to the next page.

11. If you have a number 0180 on the left side of your display, press
the Up or Down arrow to select your setting for Installer Setup
Number 0180.

12. After you select your setting, press the Up arrow key to go to
the next Installer Setup Number.

UP
ARROW

SETTING

INSTALLER
SETUP
NUMBER

DON

PRE
IN

Installer

Setup

Number

EXIT

TALLER SET

Installer

Setup

Name

0180 Fan Control

in Heating

69-1725-1 30

UP
ARROW

DOWN
ARROW

(Select Your Setting)

Settings

0 - Gas or Oil Heat -- Heating system

controls fan in a call for heat.
1 - Electric Heat -- Thermostat controls
fan in a call for heat.

M22217

Step 11. Configure Installer Setup (Cont)

SS TO

S

UP

E

13. If you do not have a number 0190 on the left side of your
display, go to the next page.

14. If you have a number 0190 on the left side of your display, press
the Up or Down arrow to select your setting for Installer Setup
Number 0190.

15. After you select your setting, press the Up arrow key to go to
the next Installer Setup Number.

UP
ARROW

SETTING

INSTALLER
SETUP
NUMBER

PRE
IN

Installer

Setup

Number

0190

EXIT

TALLER SET

Installer

Setup
Name

Heat Pump

Changeover

DON

Valve

UP
ARROW

DOWN
ARROW

(Select Your Setting)

Settings

0 - Changeover Valve in Cooling --

Use this setting if you connected a
wire labeled O to the O/B terminal.
1 - Changeover Valve in Heating -­ Use this setting if you connected a
wire labeled B to the O/B terminal.

M22228

31 69-1725-1

Step 11. Configure Installer Setup (Cont)

SS TO

S

UP

E

16. If you do not have a number 0240 on the left side of your
display, go to the next page.

17. If you have a number 0240 on the left side of your display, press
the Up or Down arrow to select your setting for Installer Setup
Number 0240.

18. After you select your setting, press the Up arrow key to go to
the next Installer Setup Number.

UP
ARROW

SETTING

INSTALLER
SETUP
NUMBER

DON

PRE

EXIT

TALLER SET

IN

Installer

Setup

Number

0240

Installer

Setup
Name

Heating

Cycle

Rate

69-1725-1 32

UP
ARROW

DOWN
ARROW

(Select Your Setting)

Settings

5 - Gas or Oil Furnace (less than
90% efficient).
9 - Electric Furnace.
3 - Gas or Oil Hot Water, Gas 90%+
High-Efficiency Furnace.
1 - Gas or Oil Steam, Gas or Oil
Gravity.

M22342

Step 11. Configure Installer Setup (Cont)

SS TO

S

UP

E

19. Press the Up or Down arrow to select your setting for Installer
Setup Number 0320.

20. After you select your setting, press the Up arrow to go to the
next Installer Setup Number.

UP
ARROW

SETTING

INSTALLER
SETUP
NUMBER

PRE
IN

Installer

Setup

Number

0320

EXIT

TALLER SET

Installer

Setup
Name

Temperature

Indication

Scale

UP
ARROW

DOWN

DON

(Select Your Setting)

Settings

ARROW

0 - Fahrenheit Temperature Display.
1 - Celsius Temperature Display.

M22218

33 69-1725-1

Step 11. Configure Installer Setup (Cont)

SS TO

S

UP

E

21. Press the Up or Down arrow to select your setting for Installer
Setup Number 0330.

22. After you select your setting, press the Up arrow to go to the
next Installer Setup Number.

UP
ARROW

SETTING

INSTALLER
SETUP
NUMBER

DON

PRE
IN

Installer

Setup

Number

0330

EXIT

TALLER SET

Installer

Setup
Name

Daylight
Savings

69-1725-1 34

UP
ARROW

DOWN
ARROW

(Select Your Setting)

Settings

0 - Daylight Savings is Off -- clock will

not adjust for Daylight Savings Time.
1 - Daylight Savings is On -- clock will
automatically adjust for Daylight
Savings Time.

M22219

Step 11. Configure Installer Setup (Cont)

SS TO

S

UP

E

23. Press the Up or Down arrow to select your setting for Installer
Setup Number 0500.

24. After you select your setting, press the Up arrow to go to the
next Installer Setup Number.

UP
ARROW

SETTING

INSTALLER
SETUP
NUMBER

PRE
IN

Installer

Setup

Number

0500

EXIT

TALLER SET

Installer

Furnace

Change

Reminder

DON

Setup
Name

Filter

UP
ARROW

DOWN
ARROW

(Select Your Setting)

Settings

0 - Furnace Filter change reminder
is Off
1 - Approximately 1 month -- based

on 10 days of fan run time.
2 - Approximately 3 months -- based
on 30 days of fan run time.
3 - Approximately 6 months -- based
on 60 days of fan run time.
4 - Approximately 9 months -- based
on 90 days of fan run time.
5 - Approximately 1 year -- based
on 120 days of fan run time.
6 - Approximately 3 years -- based
on 365 days of fan run time.

M22220

35 69-1725-1

Step 11. Configure Installer Setup (Cont)

SS TO

S

UP

E

25. Press the Up or Down arrow to select your setting for Installer
Setup Number 0530.

26. After you select your setting, press the Up arrow to go to the
next Installer Setup Number.

UP
ARROW

SETTING

INSTALLER
SETUP
NUMBER

DON

PRE
IN

Installer

Setup

Number

0530

EXIT

TALLER SET

Installer

Setup
Name

Adaptive

Intelligent

Recovery

TM

69-1725-1 36

UP
ARROW

DOWN
ARROW

(Select Your Setting)

Settings

0 - Conventional recovery -- system

starts recovery at programmed
time.

1 - Adaptive Intelligent Recovery

system starts early so the setting is

TM

--

reached by the start of programmed
period.

M22221

Step 11. Configure Installer Setup (Cont)

SS TO

S

UP

E

27. Press the Up or Down arrow to select your setting for Installer
Setup Number 0640.

28. After you select your setting, press the Done key to exit the
Installer Setup and save your settings.

29. Congratulations! The installation of the thermostat is complete.

UP
ARROW

SETTING

INSTALLER
SETUP
NUMBER

PRE
IN

Installer

Setup

Number

0640

EXIT

TALLER SET

Installer

Setup
Name

Clock

Format

UP
ARROW

DOWN

DON

(Select Your Setting)

Settings

ARROW

12 - 12-hour clock format.
24 - 24-hour clock format.

M22222

37 69-1725-1

Thermostat

SCHEDHOLD

CLOCK

SC

E

TUE

O

SYSTEM

F

g

Schedule

Inside

Se

o

S

G

Get to Know Your Thermostat Display

SYSTEM

SELECTS EM.
HEAT/HEAT/OFF/COOL

FAN

SELECTS
ON/AUTO

AUT

SCHED

ENTERS
SCHEDULING
MODE

HOLD

SETS A PERMANENT
HOLD AND ACTIVITIES
VACATION HOLD

CLOCK

SETS THE
TIME
FORWARD
OR BACK

DOWN ARROW

LOWERS TEMPERATURE
SETTING

UP ARROW

RAISES
TEMPERATURE

ETTIN

t T

ollowin

REENMOR

MORE

SHOWS FURNACE
FILTER CHANGE
REMINDER

SCREEN

LOCKS OUT THE
SCREEN TO ALLOW
FOR CLEANING

M22238

69-1725-1 38

Display

SCHED

HOLD

CLOCK

SC

E

UE

O

SYSTEM

HEAT

g

Schedule

de

S

o

U

Get to Know Your Thermostat Display (Cont)

TUE

SHOWS CURRENT DAY
OF THE WEEK

FAN

SHOWS FAN
SETTING

T

Insi

AUT

SYSTEM

SHOWS
CURRENT
SYSTEM
POSITION

TIME

DISPLAY CURRENT
TIME OF DAY, HOLD
TIME REMAINING OR
NUMBER OF VACATION
DAYS REMAINING

INSIDE TEMPERATURE

SHOWS THE CURRENT INSIDE
TEMPERATURE

SET TO
TEMPERATURE

SHOWS THE
CURRENT SET
TEMPERAT

et T

Followin

REENMOR

RE

FOLLOWING
SCHEDULE

SHOWS THE
THERMOSTAT IS
FOLLOWING THE
PROGRAMMED
SCHEDULE

M22239

39 69-1725-1

Set System Setting

Set System Setting

Press the System button to select Heat, Off or Cool:

Heat—Thermostat controls the heating system.
Off—Both the heating and cooling systems are off.
Cool—Thermostat controls the cooling system.
Em. Heat (Heat Pump Systems with Auxiliary Heat)—

Thermostat controls emergency heat and auxiliary heat, if
needed. Heat Pump compressor is not operational.

CAUTION

Equipment Damage Hazard.
Air conditioning compressor damage possible.

Do not operate cooling system when outdoor temperature is
below 50 °F (10 °C).

THU

FAN

Inside

AUTO

Set To

SYSTEM

HEAT

SCHED HOLD CLOCK SCREEN

69-1725-1 40

Following

Schedule

AM

M19962

Set System Setting (Cont)

Set Fan Setting

Press the Fan button to select Auto or On:

Auto—Normal setting for most homes. The fan runs only
when the heating or cooling system is on.

On—The fan runs continuously. Use this setting for
improved air circulation or for more efficient air cleaning.

THU

FAN

Inside

AUTO

Set To

SYSTEM

HEAT

SCHED HOLD CLOCK SCREEN

41 69-1725-1

Following

Schedule

AM

M22262

Program Your Heating and Cooling Schedule

Your thermostat can control up to four different schedule periods per
day:
Wake—Period when you awaken and want your home at a
comfortable temperature.
Leave—Period when you are away from home and want an energy­saving temperature.
Return—Period when you return home and want your home back to a
comfortable temperature.
Sleep—Period when you are asleep and want an energy-saving
temperature.

Edit Schedule

1. Press Sched key.

FRI

FAN

Inside

AUTO

Set To

SYSTEM

HEAT

AM

PM

SCHED HOLD CLOCK SCREEN

69-1725-1 42

Following
Schedule

M22445

Program Your Heating and Cooling Schedule (Cont)

SCHED

HOLD

PM

2. Press Edit key.

TUE WED THU FRI SAT SUN

MON

OK TO PICK MULTIPLE DAYS SCREEN LOCKED

FAN

Inside

AUTO

Set To

HEAT

SYSTEM

EM HEAT

HEAT

OFF
COOL
AUTO

DONE

SCHED

EDIT

CANCEL
PERIOD

AM

PM

HOLD

CLOCK SCREEN

WAKE

LEAVE RETURN SLEEP CANCEL

Following
Schedule

COOL

M22553

43 69-1725-1

Program Your Heating and Cooling Schedule (Cont)

3. It is OK to pick multiple days. Select any combination of days to

edit. These days are scheduled with the same times and
temperatures. Check marks appear next to days selected.

TUE WED THU FRI SAT SUN

MON

OK TO PICK MULTIPLE DAYS

FAN

ON

AUTO

CIRC

CANCEL
PERIOD

HEAT

AM

DONE WAKE LEAVE RETURN SLEEP CANCEL

COOL

M22300

4. Press Wake key. Once pressed, Wake flashes to show it is
selected.

5. Press Up and Down keys to modify time and heat and cool tem­peratures from this screen.

6. Press Leave key and repeat step 5.

7. Press Return key and repeat step 5.

8. Press Sleep key and repeat step 5.

69-1725-1 44

Program Your Heating and Cooling Schedule (Cont)

9. When complete, press Done key. “Saving Changes” appears on

the screen to indicate changes are being saved to the day(s)
modified.

TUE WED THU FRI

MON

SAVING

CHANGES

M19956

10. To set a Program Schedule for the remaining days of the week,
repeat steps 1-9. Example: If Mon-Fri was selected first, go
back and repeat steps 1-9 for Sat and Sun.

To exit schedule without saving changes, press Cancel key
any time.

45 69-1725-1

Cancel a Schedule Period

NOTE: You may want to cancel a period to match your lifestyle; for

example, if someone is always home during the day on
Tuesday, you can cancel the Leave and Return periods (the
thermostat would then control to the Wake temperature until
the Sleep period).

1. Press Sched key.

2. Press Edit key.

3. Select the Day(s) of the week desired.

4. Press schedule period you want to cancel (Wake, Leave,

Return or Sleep). Once selected, the period flashes.

5. Press Cancel Period key. The time, temperature(s) and fan set­ting disappear. The bar above the selected period is removed,
indicating the scheduled period was cancelled.

TUE WED THU FRI SAT SUN

MON

OK TO PICK MULTIPLE DAYS

FAN

HEAT

COOL

DONE WAKE LEAVE RETURN SLEEP CANCEL

M19957

6. Press Done key.

To reinstate a schedule period, press arrow keys to set
desired time and temperatures.

69-1725-1 46

Set Time

Set Time

1. Press Clock.

2. Use the arrows to set the current time.

TUE

AM

DONE CANCEL

3. Press the Done key.

M19958

The current day of the week should already be set correctly.
If not, see Step 11, Configure Installer Setup.

47 69-1725-1

Set Temperature Overrides

Hold Temperature Until (Temporary Hold)

Hold temperature temporarily until the next scheduled period time or
until the time the user sets.

1. Press the Up or Down arrow next to the temperature you want
to adjust. “Hold Temperature Until” time appears on the screen.
The Hold Temperature Until time defaults to the start time of the
next scheduled period.

2. Press the Up or Down arrow next to the Time key to set the
desired time for the thermostat to resume the schedule.

TUE

FAN

AUTO

SYSTEM

HEAT

Inside

Hold Temperature

Until

Set To

PM

SCHED HOLD CLOCK SCREEN

CANCEL

M19959

3. Press the Cancel or Sched key to cancel “Hold Temperature
Until” and resume schedule. “Following Schedule” appears on
the screen to indicate that the “Temporary Hold” has ended.

The Time Up and Down arrows are shown for approximately
seven seconds. Pressing on the screen time (where the
Hold Temperature Until time is shown) allows the arrows to
reappear.

69-1725-1 48

Set Temperature Overrides (Cont)

Permanent Hold

Permanent Hold changes the temperature setting until Permanent
Hold is cancelled.

1. Press the Hold key. “Permanent Hold” appears on the screen.

2. Press the Up or Down arrow next to the temperature you want

to set during “Hold.”

TUE

FAN

Inside

AUTO

SYSTEM

HEAT

Permanent

Hold

SCHED HOLD CLOCK SCREEN

3. Press the Cancel key to cancel “Permanent Hold” and resume
the schedule.

Set To

AM

CANCEL

M19960

The screen shows Permanent Hold until it is cancelled.

49 69-1725-1

Set Temperature Overrides (Cont)

Vacation Hold

Changes temperature setting for a designated number of days.

1. Press the Up and Down arrow keys to set the desired tempera­ture while away on vacation. Notice that “Hold Temperature
Until” time is shown on the screen. (This is the time the
Vacation Hold override expires after the number of days you
selected ends.)

2. Press the Hold key twice. Screen shows “Hold Temperature
Until” 1 day.

3. Press the Up and Down arrow keys to change the number of
Days you desire the thermostat to override the schedule.

THU

FAN

AUTO

SYSTEM

HEAT

Inside

Hold Temperature

Until

Set To

DAYS

SCHED CLOCK SCREEN

CANCEL

M19961

4. To cancel Vacation Hold override early, press the Cancel key.

When the number of days of Vacation Hold expires, the
screen shows “Following Schedule” to indicate that Vacation
Hold has ended.

69-1725-1 50

Clean Your Thermostat Screen

1. Press the Screen key. The thermostat locks out all touch keys

for 30 seconds to allow for cleaning.

OK TO
CLEAN

SCREEN

M19964

2. Use a damp cloth slightly moistened with water or household
glass cleaner to clean the screen.

3. Repeat the above steps, as necessary.

4. Press the Done key to return to the Home Screen and normal

operation.

Do not spray any type of liquid directly onto the thermostat
itself. If using household glass cleaner, spray the cleaner on
a cloth. Then use the cloth to clean the thermostat screen.

51 69-1725-1

Use Your Filter Timer

MON

UE

THUSASUN

C

GE

UV LAMP HUMIDIFIER PAD

de

S

o

O

D

The Filter Timer notifies you when to change your furnace filter.

Reset Filter Timer

1. “Change Filter” appears on the screen when the filter timer
expires.

2. Press the Reset key to restart the filter timer.

T

K TO PICK MULTIPLE DAYS SCREEN LOCKE

HAN

Insi

AUTO

et T

SYSTEM

RESET

HEAT

PM

SCHED HOLD CLOCK SCREEN MORE

Following
Schedule

M19975

View or Reset Timer Settings Before They Expire

1. Press the More key until the Filter Timer appears on the screen.

2. Press the Edit key to change the Timer reload value. Use the

Up or Down arrow keys to change the number of run Time
Days. See Configure Installer Setup Number 0500, for
approximate calendar days.

3. Press the Done key to go back to viewing the filter timer.

4. Press the Reset key to reset the timer to the timer reload value.

(This is the setting you set in the Installer Setup or the new
reload value you selected in step 2.)

5. Press the Done key.

69-1725-1 52

Understanding Temperature Recovery Feature

Your thermostat comes with a feature called Adaptive Intelligent Recovery™,
which eliminates all guesswork when setting your schedule. How long does it
take the furnace to warm your house in the morning before you get out of bed
or how long does it take the air conditioner to cool your house in the afternoon
before you return from work? No problem. The thermostat determines that for
you.

Simply set your program schedule to the time you want the house to be at your
comfort temperature. The thermostat then turns on the heating or cooling at
just the right time to have your home reach your scheduled temperature at
your scheduled time.

For example—you get out of bed at 6:00 AM and want the temper-ature to be
70°F. Set the Wake period for 6:00 AM and 70°F. The thermostat then turns on
the heat before 6:00 AM to raise the temperature to 70°F by 6:00 AM.

The thermostat alerts that the heating or cooling system is coming on before a
scheduled time when “Recovery” shows on the screen.

TUE

FAN

AUTO

Inside

Set To

SYSTEM

HEAT

PM

SCHED HOLD CLOCK SCREEN MORE

Following
Schedule

Recovery

M22301

It takes about a week for the thermostat to adjust to local
weather, your schedule, the construction of your home and
your heating and/or cooling system. Each day it adjusts the
next day’s recovery start time accordingly.

53 69-1725-1

Replace Batteries

1. When the LO Battery indicator is flashing, replace the

batteries promptly with three fresh AAA alkaline batteries

2. Remove thermostat from the wallplate by pulling straight out.

M19963

WALL

M22243

69-1725-1 54

Replace Batteries (Cont)

S

+

3. Remove the old batteries and insert three fresh AAA alkaline
batteries, as marked on the thermostat.

BACK OF THERMOSTAT

BATTERIE

(3)

M22212

55 69-1725-1

Replace Batteries (Cont)

4. Align the screw blocks with the pins on the back of the

thermostat.

WALLPLATE

PINS ON

BACK OF

THERMOSTAT

TERMINAL
SCREW
BLOCK

M22213

5. Push the thermostat straight onto the wallplate until it snaps
into place.

69-1725-1 56

Review Battery Tips

1. Replace the batteries as soon as LO Batt flashes in the display.

The LO Battery indicator flashes in the display one month
before the batteries run down completely.

2. Always use fresh AAA alkaline batteries. Non-alkaline batteries
do not last as long and can leak, causing thermostat damage.

3. Although the thermostat has a Low Battery indicator, replace
the batteries once a year to prevent the thermostat and heating/
cooling system from shutting down due to lack of battery power.

4. As a precaution, replace the batteries when leaving your home
for more than a month to prevent your heating/cooling system
from shutting down if the batteries run down completely.

57 69-1725-1

Built-in Compressor Protection

t

C

SCHEDHOLD

CLOCK

SC

E

O

SYSTEM

COOL

g

Schedule

de

S

o

The RTH8500D Thermostat has built-in compressor protection
(minimum-off timer) that prevents the compressor from restarting too
early after a shutdown.

The minimum-off timer is activated after the compressor turns off.

If there is a call during the minimum-off timer, the thermostat shows
“Wait” in the display.

Insi

AUT

et T

Wai

Followin

REENMOR

ool

222

When the minimum-off timer expires, “Cool On” or “Heat On”
appears solidly in the display and the compressor and fan turn on.

_________

a

Heat Pumps only.

69-1725-1 58

a

Troubleshooting Tips

If . . . Then . . .

Key to the right of the
Screen key is blank.

Display is blank. Check that fresh AAA alkaline batteries are

Temperature settings
do not change.

Heating system does
not turn on.

Cooling system does
not turn on.

Verify that this key remains blank unless you
set the Furnace Filter Change Reminder. See
Installer Setup Number 0500 in Step 11.

installed as marked on the thermostat.

Check that the temperature settings are:

• Heating 40°F to 90°F(4.5°C to 32°C).

• Cooling 50°F to 99°F (10°C to 37°C).

• Set the system to Heat by pressing the

System key.

• Check the heat temperature setting to be
sure it is set above the room temperature
and “Heat On” shows solidly in the display.

• Check the circuit breaker to be sure it is
not tripped.

• Check power switch at heating and/or
cooling system to be sure it is on.

• Check the furnace door to be sure it is
closed securely.

• Wait five minutes for the heating system to
respond.

• If all of this was checked, contact your
local heating and cooling contractor.

• Set the system to Cool by pressing the
System key.

• Check the cool temperature setting to be
sure it is set below the room temperature
and “Cool On” shows solidly in the display.

• Check the circuit breaker to be sure it is
not tripped.

• Check the power switch at the heating
and/or cooling system to be sure it is on.

• Check the furnace door to be sure it is
closed securely.

• Wait five minutes for the cooling system to
respond.

• If all of this was checked, contact your
local heating and cooling contractor.

59 69-1725-1

Troubleshooting Tips (Continued)

If . . . Then . . .

Cannot set System
setting to Cool.

“Heat On” is not
shown in the display.

“Cool On” is not
shown in the display.

“Wait” shows in the
display.

Fan does not turn on
in a call for heat
(electric furnaces
only).

Heat pump puts out
cool air in the heat
mode and warm air in
the cool mode (heat
pumps only).

Both the heating and
cooling systems are
running at the same
time.

Check Installer Setup Number 0170, Heating
and/or Cooling System Type; make sure the
setting matches the installed heating and/or
cooling system.

Set the System setting to Heat and set the
temperature setting above the room
temperature. If “Heat On” is shown solidly in
the display, but the heating system does not
turn on, see “Heating system does not turn
on” in the Troubleshooting Tips.

Set the System setting to Cool and set the
temperature setting below the room
temperature. If “Cool On” is shown solidly in
the display, but the cooling system does not
turn on, see “Cooling system does not turn
on” in the Troubleshooting Tips.

Compressor minimum-off timer is active. Wait
up to five minutes for the cooling or heating
system to turn on.

Check Installer Setup Number 0180, Fan
Control in Heating, and make sure it is set to
Electric Heat.

Check Installer Setup Number 0190, Heat
Pump Changeover Valve, and make sure the
setting matches the changeover required by
the installed heat pump.

Check Installer Setup Number 0170, Heating
and/or Cooling System Type, and make sure
the setting matches the installed heating and/
or cooling system.

Check and make sure the bare portions of the
wires are not touching.

69-1725-1 60

Troubleshooting Tips (Continued)

If . . . Then . . .

Heating system is
running in cool mode.

Heating system does
not turn off and the
heat temperature
setting is set below
the room temperature
(“Heat On” is not
shown in display).

Red LED is on in the
upper right corner and
the Heat Pump is not
working.

Check Installer Setup Number 0170, Heating
and/or Cooling System Type, and make sure
the setting matches the installed heating and/
or cooling system.

Check Installer Setup Number 0170, Heating
and/or Cooling System Type, and make sure
the setting matches the installed heating and/
or cooling system.

A system monitor is wired to the thermostat L
terminal. See Heating or Cooling system does
not turn on in the Troubleshooting Tips.

61 69-1725-1

Customer Assistance

For assistance with your Honeywell product, please visit
www.honeywell.com/yourhome

or call Honeywell Customer Care

toll free at 1-800-468-1502.

69-1725-1 62

Limited One-Year Warranty

Honeywell warrants this product, excluding battery, to be free from defects in the
workmanship or materials, under normal use and service, for a period of one (1) year from
the date of purchase by the consumer. If, at any time during the warranty period, the
product is defective or malfunctions, Honeywell shall repair or replace it (at Honeywell’s
option) within a reasonable period of time.

If the product is defective,
(i) return it, with a bill of sale or other dated proof of purchase, to the retailer from which

you purchased it, or

(ii) package it carefully, along with proof of purchase (including date of purchase) and a

short description of the malfunction, and mail it, postage prepaid, to the following
address:

Honeywell Return Goods
Dock 4 MN10-3860
1885 Douglas Dr N
Golden Valley, MN 55422

This warranty does not cover removal or reinstallation costs. This warranty shall not apply
if it is shown by Honeywell that the defect or malfunction was caused by damage which
occurred while the product was in the possession of a consumer.

Honeywell’s sole responsibility shall be to repair or replace the product within the terms
stated above. HONEYWELL SHALL NOT BE LIABLE FOR ANY LOSS OR DAMAGE OF
ANY KIND, INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES
RESULTING, DIRECTLY OR INDIRECTLY, FROM ANY BREACH OF ANY WARRANTY,
EXPRESS OR IMPLIED, OR ANY OTHER FAILURE OF THIS PRODUCT. Some states
do not allow the exclusion or limitation of incidental or consequential damages, so this
limitation may not apply to you.

THIS WARRANTY IS THE ONLY EXPRESS WARRANTY HONEYWELL MAKES ON
THIS PRODUCT. THE DURATION OF ANY IMPLIED WARRANTIES, INCLUDING THE
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE, IS HEREBY LIMITED TO THE ONE-YEAR DURATION OF THIS
WARRANTY. Some states do not allow limitations on how long an implied warranty lasts,
so the above limitation may not apply to you.

This warranty gives you specific legal rights, and you may have other rights which vary
from state to state.

If you have any questions concerning this warranty, please write Honeywell Customer
Relations, 1985 Douglas Dr, Golden Valley, MN 55422 or call 1-800-468-1502. In Canada,
write Retail Products
ON15-02H, Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough,
Ontario M1V4Z9.

63 69-1725-1

Automation and Control Solutions

Honeywell International Inc. Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Scarborough, Ontario

M1V 4Z9

69-1725-1 G.H. Rev. 10-04 www.honeywell.com/yourhome