RTH8500D Touch Screen Programmable Thermostat

OWNERS 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 or call Honeywell Customer Care toll free at 1-800-468-1502.
Read and Save these Instructions
U.S. Pat. 6,595,430 Other Patents Pending U.S. Registered Trademark 2004 Honeywell International Inc. All Rights Reserved

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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
Step 1. Prepare for Installation
1. Check that the following items are included:

Insi de Set

WALLPLATE THERMOSTAT MOUNTING SCREWS (2) AND WALL ANCHORS (2)
OWNER'S GUIDE WIRE LABELS CAUTION CARD

OWNER'S GUIDE

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 the corresponding letter on your new thermostat or base.

Inside Set To

de la letra correspondiente de

Y2 H RC W X1

Y2 H RC W

C L RH W1

C L RH W1 X2

E O T W2 Y

E O T W2

F P U W3

F P U W3 Y1

V/VR V/VR

Read and save these instructions

69-0823EFS

yourhome

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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: 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
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
DO NOT WIRE NEW THERMOSTAT BASED ON WIRE COLOR.

ORANGE

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Step 3. Remove Old Thermostat
1. 2. 3. Turn off power at the heating and/or cooling system or fuse/circuit breaker panel. Remove the cover from the old thermostat. Remove the old thermostat from the wall or wallplate. Do not remove the wires.

WALLPLATE

THERMOSTAT
.18.2.9.7.5 O.25 N G E R.4.3
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.

MERCURY NOTICE

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Step 4. Follow Special Instructions
1. 2. 3. If you have two C and/or C1 wires connected to your old thermostat, do not connect them to your new thermostat. Disconnect the C and/or C1 wires. Make sure they do not touch each other or any other wires. Wrap the bare end of each C and/or C1 wire with electrical tape.

Y G C R C

LETTER DESIGNATION SCREW TERMINAL WIRE
WIRE HOLE DO NOT CONNECT TO NEW THERMOSTAT

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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.
WIRE HOLE CONNECT TO THE "C" ON THE NEW THERMOSTAT

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5. 6. If you find any wires not connected to your old thermostat, do not connect them to your new thermostat. Wrap the end of the wires that are not connected with electrical tape.
LETTER DESIGNATION SCREW TERMINAL

G R RC

WIRE WIRE HOLE WIRES NOT CONNECTED DO NOT CONNECT TO NEW THERMOSTAT

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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. Remove any remaining part of the old thermostat from the wall.
WIRE LABEL LETTER DESIGNATION SCREW TERMINAL

WIRE HOLE

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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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Step 6. Mount New Wallplate to Wall
1. Separate the wallplate from the thermostat as shown.

WALLPLATE WIRE HOLE

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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

LABELED WIRES

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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)

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4. 5. 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. Tap the wall anchors into the drilled holes until even with the wall surface.
DRILLED HOLES (2) WALL ANCHORS (2)

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MOUNTING SCREWS (2)
Position the wallplate over the wall anchors. Insert the mounting screws into the wall anchors. Check leveling, if desired, and tighten the mounting screws.
Step 7. Connect Wires to New Wallplate
1. 2. Match the labeled wires to the letter designations on the wallplate. 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

RC R W

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If wires are to be connected to both Rc and R, loosen the Rc and R screw terminals and remove the metal jumper wire. If only one of the terminals, Rc or R, is to be connected, leave the metal jumper wire in place.
See table on page 29 to help you determine if you have a CONVENTIONAL or HEAT PUMP system.
Step 7. Connect Wires to New Wallplate (Cont)
5. 6. 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. 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 DESIGNATIONS WALLPLATE

G C (NOT USED)

INSERT WIRE IN HOLE

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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
Possible letter designations on the labeled wires

RC or R

R or RH, 4, V

W or W1, H

Y or Y1, M

G or F

C or C1, X, B

C Y2 W2

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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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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 RC and R. Leave metal jumper wire in place if only one of the terminals, RC or R, will be connected on the new thermostat. 2 If wires were connected to both R and RH terminals on the old thermostat, remove metal jumper wire between RC and R on the new thermostat. Connect the old R to the new RC and the old RH 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.

M22246

8. Compare letter designations on your old and new thermostats. Use the information below if you are wiring a HEAT PUMP System.
Possible letter designations on the labeled wires HEAT PUMP letter designations on the new thermostat

VR or V or R

H or B, O

Y1 or M or Y

Y G C L E AUX

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F or G

X or B, C

F or L

X2 or X, E

AUX, W1, W or W2
Be sure to read the note referenced in the numbered triangles above. These numbered notes appear on the next page.

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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. 3 If the old thermostat had wires on both O and B, be sure to attach the B wire to the C letter designation on the new thermostat. If another wire is already matched to the C, contact Honeywell. 4 If the old thermostat had wires on W1, Y1 and W2, some system modification is required. Call your local heating and cooling contractor for assistance.

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Step 7. Connect Wires to New Wallplate (Cont) 9. Push excess wire back into the wall opening. Keep wires in the shaded area.

WIRE WALLPLATE

WALL OPENING SHADED AREA

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Step 8. Install Batteries
1. Install three fresh AAA alkaline batteries on the back of the thermostat as marked on the thermostat.

BACK OF THERMOSTAT

BATTERIES (3)

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Remove the tab labeled Remove during installation in the lower right corner of the thermostat back.
REMOVE DURING INSTALLATION

REMOVE TAB

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Step 9. Attach New Thermostat to Wallplate
1. Align the screw blocks with the pins on the back of the thermostat.
PINS ON BACK OF THERMOSTAT TERMINAL SCREW BLOCK

M22213

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

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Step 10. Set the Calendar
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. 2. Use the arrow keys to set the year, month and day. Press the Done key.
SET CURRENT DATE SET MONTH

USE ARROWS TO SET YEAR

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The calendar can be set any time. See Step 11, Configure Installer Setup, for instructions.
Step 10. Set the Calendar (Cont)
3. 4. Use the arrow keys to set the current time. Press the Done key.

USE ARROWS TO SET TIME

SAT AT

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Step 11. Configure Installer Setup
1. 2. 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. Press and release the System key.

FAN ON AUTO

Inside

Set To

SYSTEM EM HEAT

OFF COOL

Following Schedule

SCREEN

M22225
Step 11. Configure Installer Setup (Cont)
3. Press and hold the center blank key for approximately five seconds, until the screen changes.
CHANGE FILTER UV LAMP HUMIDIFIER PAD Inside Set To

CANCEL

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

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11. Configure Installer Setup (Cont)
5. 6. 7. 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. After you select your setting, press the Up arrow key to the right of 0120 to go to the next Installer Setup Number. 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

FACTORY SETTING

CHANGE THE FACTORY SETTING
PRESS TO EXIT INSTALLER SETUP
Installer Setup Number 0140 0150
Installer Setup Name Date (Year Upper) Date (Year Lower) Date (Month) Date (Day)
(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

8. 9. Press the Up or Down arrows to select your setting for Installer Setup Number 0170. After you select your setting, press the Up arrow to go to the next Installer Setup Number.
UP ARROW INSTALLER SETUP NUMBER PRESS TO EXIT INSTALLER SETUP
SETTING UP ARROW DOWN ARROW
Installer Installer Setup Setup Number Name
0170 System Type Selection
(Select Your Setting) Settings
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).

23. 24. Press the Up or Down arrow to select your setting for Installer Setup Number 0500. After you select your setting, press the Up arrow to go to the next Installer Setup Number.
Installer Setup Number 0500
Installer Setup Name Furnace Filter Change Reminder
(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.

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25. 26. Press the Up or Down arrow to select your setting for Installer Setup Number 0530. After you select your setting, press the Up arrow to go to the next Installer Setup Number.
Installer Setup Number 0530
0 - Conventional recovery -- system Adaptive starts recovery at programmed Intelligent time. RecoveryTM 1 - Adaptive Intelligent RecoveryTM -system starts early so the setting is reached by the start of programmed period.

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27. 28. 29. Press the Up or Down arrow to select your setting for Installer Setup Number 0640. After you select your setting, press the Done key to exit the Installer Setup and save your settings. Congratulations! The installation of the thermostat is complete.
Installer Setup Number 0640
Installer Setup Name Clock Format
(Select Your Setting) Settings 12 - 12-hour clock format. 24 - 24-hour clock format.

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Get to Know Your Thermostat Display Thermostat

SYSTEM

SELECTS EM. HEAT/HEAT/OFF/COOL

DOWN ARROW

LOWERS TEMPERATURE SETTING

SELECTS ON/AUTO

RAISES TEMPERATURE SETTING

FAN AUTO

Inside n

ENTERS SCHEDULING MODE

SETS THE TIME FORWARD OR BACK
SHOWS FURNACE FILTER CHANGE REMINDER
SETS A PERMANENT HOLD AND ACTIVITIES VACATION HOLD

LOCKS OUT THE SCREEN TO ALLOW FOR CLEANING

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Get to Know Your Thermostat Display (Cont) Display
SHOWS CURRENT DAY OF THE WEEK

INSIDE TEMPERATURE

SHOWS THE CURRENT INSIDE TEMPERATURE

SHOWS FAN SETTING

SET TO TEMPERATURE
SHOWS THE CURRENT SET TEMPERATURE
SHOWS CURRENT SYSTEM POSITION
DISPLAY CURRENT TIME OF DAY, HOLD TIME REMAINING OR NUMBER OF VACATION DAYS REMAINING

FOLLOWING SCHEDULE

SHOWS THE THERMOSTAT IS FOLLOWING THE PROGRAMMED SCHEDULE

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Set System Setting Set System Setting
Press the System button to select Heat, Off or Cool: HeatThermostat controls the heating system. OffBoth the heating and cooling systems are off. CoolThermostat 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.
Equipment Damage Hazard. Air conditioning compressor damage possible. Do not operate cooling system when outdoor temperature is below 50 F (10 C).

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Set System Setting (Cont) Set Fan Setting
Press the Fan button to select Auto or On: AutoNormal setting for most homes. The fan runs only when the heating or cooling system is on. OnThe fan runs continuously. Use this setting for improved air circulation or for more efficient air cleaning.

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Program Your Heating and Cooling Schedule Your thermostat can control up to four different schedule periods per day: WakePeriod when you awaken and want your home at a comfortable temperature. LeavePeriod when you are away from home and want an energysaving temperature. ReturnPeriod when you return home and want your home back to a comfortable temperature. SleepPeriod when you are asleep and want an energy-saving temperature. Edit Schedule 1. Press Sched key.

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Program Your Heating and Cooling Schedule (Cont)

2. Press Edit key.

OK TO PICK MULTIPLE DAYS SCREEN LOCKED
SYSTEM EM HEAT HEAT OFF COOL AUTO SCHED DONE EDIT

CANCEL PERIOD

HOLD WAKE

CLOCK LEAVE

SCREEN RETURN

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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.

FAN ON AUTO CIRC

OK TO PICK MULTIPLE DAYS

RETURN

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4. 5. 6. 7. 8.

Press Wake key. Once pressed, Wake flashes to show it is selected. Press Up and Down keys to modify time and heat and cool temperatures from this screen. Press Leave key and repeat step 5. Press Return key and repeat step 5. Press Sleep key and repeat step 5.
9. When complete, press Done key. Saving Changes appears on the screen to indicate changes are being saved to the day(s) modified.

SAVING CHANGES

M19956
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.

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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. 2. 3. 4. 5. Press Sched key. Press Edit key. Select the Day(s) of the week desired. Press schedule period you want to cancel (Wake, Leave, Return or Sleep). Once selected, the period flashes. 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.

M19957

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

Set Time Set Time

1. 2. Press Clock. Use the arrows to set the current time.

M19958

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

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

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

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

Set To WaitCool

HEAT COOL

M22244

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

Heat Pumps only.

Troubleshooting Tips
If. Then. Key to the right of the Verify that this key remains blank unless you Screen key is blank. set the Furnace Filter Change Reminder. See Installer Setup Number 0500 in Step 11. Display is blank. Check that fresh AAA alkaline batteries are installed as marked on the thermostat. Temperature settings Check that the temperature settings are: do not change. Heating 40F to 90F(4.5C to 32C). Cooling 50F to 99F (10C to 37C). Heating system does Set the system to Heat by pressing the not turn on. 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. Cooling system does Set the system to Cool by pressing the not turn on. 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.

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Troubleshooting Tips (Continued)
If. Cannot set System setting to Cool. Heat On is not shown in the display. Then. 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.
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.
If. Then. Heating system is Check Installer Setup Number 0170, Heating running in cool mode. and/or Cooling System Type, and make sure the setting matches the installed heating and/ or cooling system. Heating system does Check Installer Setup Number 0170, Heating not turn off and the and/or Cooling System Type, and make sure heat temperature the setting matches the installed heating and/ setting is set below or cooling system. the room temperature (Heat On is not shown in display). Red LED is on in the A system monitor is wired to the thermostat L upper right corner and terminal. See Heating or Cooling system does the Heat Pump is not not turn on in the Troubleshooting Tips. working.

Customer Assistance

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 Honeywells 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-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. Honeywells 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 Limite, 35 Dynamic Drive, Scarborough, Ontario M1V4Z9.

Automation and Control Solutions
Honeywell International Inc. 1985 Douglas Drive North Golden Valley, MN 55422 Honeywell Limited-Honeywell Limite 35 Dynamic Drive Scarborough, Ontario M1V 4Z9

69-1725-1 G.H.

Rev. 10-04
www.honeywell.com/yourhome

Operating Manual

RTH8500
Touchscreen Programmable Thermostat

69-2220EF-01

BE CAREFUL! Never use sharp instruments, such as a pencil or pen, to press touchscreen keys. To prevent damage to the thermostat, always press keys with your fingertip.
Note: Remove wallplate from the thermostat and see the label on the back of the thermostat for model number.

M28372

This thermostat contains a Lithium battery which may contain Perchlorate material. Perchlorate Materialspecial handling may apply, See www.dtsc.ca.gov/hazardouswaste/perchlorate

Need Help?

For assistance with this product please visit http://DIYthermostats.honeywell.com or call Honeywell Customer Care toll-free at 1-800-468-1502
Read and save these instructions.
U.S. Registered Trademark. US Patent No. 6,595,430; 7,114,554; 7,274,972; 7,225,054; D520,386 and other patents pending. Copyright 2008 Honeywell International Inc. All rights reserved.

Table of contents

About your new thermostat
Thermostat features. 2 Programming at a glance.. 3 Quick reference to controls. 4 Quick reference to status display. 5 Clock setting.. 6 Fan setting... 7 System setting.. 8. Using program schedules.. 9. Program schedule overrides.. 12 Vacation hold.. 14 Screen cleaning.. 15. Furnace filter reminder. 16. Special features.. 17.

Appendices

Battery replacement/ Customer assistance.. 18 In case of difficulty. 19 Limited warranty.. 21.
Programming & Operation
This thermostat is ready to go!
Your new thermostat is preprogrammed and ready to go. See page 3 to check settings.
CAUTION: EQUIPMENT DAMAGE HAZARD. To prevent possible compressor damage, do not operate cooling system when outdoor temperature is below 50F (10C).

69-2220EF01

Congratulations! Youve just purchased the worlds most advanced, easy-to-use thermostat. It has been designed to give you many years of reliable service and touchscreen climate control.

Features

7-day program schedules maximize comfort and economy. Armchair programming: Just pull thermostat from the wall to set schedules. EnergyStar compliant to greatly reduce your heating/cooling expenses.
One-touch temp control overrides program schedule at any time. Precise comfort control keeps temperature within 1F of the level you set. Change/check reminders let you know when to replace filters and batteries. Large touchscreen display with backlight is easy to readeven in the dark.
This thermostat is ready to About your new thermostat go!
Your new thermostat is pre-programmed and ready to go. All you have to do is set the time and day. Then check the settings below and change if needed: 1. Set clock....See page 6. 2. Select fan setting: Preset to Auto..To change, see page 7 3. Select system setting: Preset to Heat.To change, see page 8 4. Program schedules: Preset to energy-saving levels while youre at work or asleep (assumes you wake at 6 am, leave at 8 am, return at 6 pm and go to bed at 10 pm)...To change, see pages 10-13
ONE-TOUCH TEMP CONTROL: You can override the program schedule at any time, and manually adjust the temperature (see pages 12-14).
Quick reference to controls
Press day(s) to set program schedule (see page 11) Press to select fan operation (see page 7) Press to select system type (see page 8) Press to set program schedule (see page 11) Press to adjust temperature settings (see pages 11-14) Press for more options (select models only)

FAN AUTO

OK TO PICK MULTIPLE DAYS

Inside

Set To

SYSTEM

Following Schedule

SCREEN

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Press to override program schedule (see pages 12-14)
Press to set clock (see page 6)
Press to lock keypad for 30 seconds to clean screen (see page 17)
Quick reference to status display
Current inside temperature Current day of week

Temperature setting

Fan setting System setting Current time

Recovery

Program schedule on (does not display when off)

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Smart Response Technology in effect (see page 15)
Other display messages: Cool On: Cooling system is activated Heat On: Heating system is activated Aux Heat On: Auxiliary heating system is activated (heat pump systems only) 69-2220EF01

Operating Manual WED

Clock setting To Inside Set

Press CLOCK

HOLD WED
To set the current time display, press CLOCK, then press s or t to adjust the time. Press and hold s or t to advance the time more quickly.
Adjust time, then press DONE

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Press DONE to save & exit (or press CANCEL to exit without changing the time).
Note: The real-time clock should never require adjustment since it automatically updates for daylight savings time, and stores all date/time information.

CANCEL

Note: To change the current week day display, see see System Setup in your Installation Guide.

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Fan setting
Press FAN to select fan operation, then press DONE. On: Fan is always on. Auto: Fan runs only when the heating or cooling system is on.

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Press FAN

System setting

Press the SYSTEM button to select, then press DONE.
Heat: Thermostat controls only the heating system. Cool: Thermostat controls only the cooling system. Auto: Thermostat automatically selects heating or cooling depending on the indoor temperature. Off: Heating and cooling systems are off. Em Heat (only for heat pumps with auxiliary heat): Thermostat controls Emergency and Auxiliary Heat. Compressor is locked out.

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Note: The Auto and Em Heat system settings may not appear, depending on how your thermostat was installed.
Save money by setting program schedules
Its easy to program your system for maximum energy savings. You can program four time periods each day, with different settings for weekdays and weekends.

WAKE 6:00 am

Set to the time you awaken and the temperature you want during the morning, until you leave for the day. Set to the time you leave home and the temperature you want while you are away (usually an energy-saving level). Set to the time you return home and the temperature you want during the evening, until bedtime. Set to the time you go to bed and the temperature you want overnight (usually an energy-saving level).

LEAVE 8:00 am

RETURN 6:00 pm

SLEEP 10:00 pm

EnergyStar settings for maximum cost savings
This thermostat is pre-set to use EnergyStar program settings. We recommend these settings, since they can reduce your heating/cooling expenses by as much as 33%. (See next page to adjust times and temperatures of each time period.)

Heat (Mon-Fri)

Wake (6:00 am) Leave (8:00 am) Return (6:00 pm) Sleep (10:00 pm)

Cool (Mon-Fri)

Heat (Sat-Sun)

Cool (Sat-Sun)

[Or cancel period]

Press SCHED

To adjust program schedules 6:00

Press EDIT

DONE EDIT

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RETURN

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Select day(s)

MON TUE WED

Set heat/cool levels

THU FRI SAT SUN

CANCEL PERIOD
1. Press SCHED, then EDIT. 2. Press day buttons (MON-SUN) to select day(s). 3. Press s or t to set Wake time for selected day(s). 4. Press s or t to set Heat and Cool temperature for this time period. 5. Press other time periods (LEAVE, RETURN, SLEEP) to set time and temperatures for each. 6. Press DONE to save & exit (or press CANCEL to exit without saving changes).
Note: You can press CANCEL PERIOD to eliminate any unwanted time period.

DONE WAKE

LEAVE RETURN SLEEP
Set time for program period to start

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Program schedule override (temporary)

Adjust temperature

Press s or t to immediately adjust the temperature. This will temporarily override the temperature setting for the current time period. The new temperature will be maintained only until the time you set. When the timer expires, the program schedule will resume and set the temperature to the level youve programmed for the current time period. To cancel the temporary setting at any time, press CANCEL (or SCHED). The program schedule will resume.

Heat On

Hold Temperature Until

MORE CANCEL

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Press to set timer Press CANCEL (or SCHED) to resume program schedule
Program schedule override (permanent)
Press HOLD Adjust temperature
Press HOLD to permanently adjust the temperature. This will turn off the program schedule. Whatever temperature you set will be maintained 24 hours a day until you manually change it or press CANCEL (or SCHED) to cancel Hold and resume the program schedule.

Permanent Hold

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Press CANCEL (or SCHED) to resume program schedule

Vacation hold

1. WED temperature Set
This feature can suspend the program schedule for extended periods of time. Press s or t to set the temperature you want, then press s or t to set the time of day you want the schedule to resume when you return. Press HOLD twice, then press s or t to select the number of days.
2. Press to set time for Set To schedule to resume AUTO 3. Press HOLD twice

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Hold Temperature Until DAYS
Whatever temperature you set will be maintained 24 hours a day for the number of days you select. After this number of days have elapsed, the previously programmed schedule will resume at the time you set. If you return earlier than expected, press CANCEL (or SCHED) to cancel Hold and resume the program schedule.
4. Press to select number of days 69-2220EF01

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Screen cleaning 70

Inside Set To

SCREEN LOCKED

Press SCREEN

Press SCREEN to lock the screen for cleaning. The screen will remain locked for 30 seconds so you can clean the screen without changing any settings.

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Screen lock timer (30 seconds)
After 30 seconds, press DONE to resume normal operation, or press SCREEN again if you require more time for cleaning.
Note: Do not spray any liquid directly on the thermostat. Spray liquids onto a cloth, then use the damp cloth to clean the screen. Use water or household glass cleaner. Avoid abrasive cleansers.

OK TO CLEAN SCREEN

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Furnace filter reminder About your new thermostat
WED Press RESET after changing filter.

CHANGE FILTER Inside

If activated during installation, the furnace filter reminder alerts you when it is time to replace your filter. Press RESET after changing the filter, to restart the timer. To change the reminder interval: 1. Press MORE, then EDIT.

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SCHED HOLD
Press MORE to change reminder interval.

Filter

2. Press s or t to select the desired interval, then press DONE. 3. Press RESET. 4. Press DONE to save and exit.

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Special features
Smart Response Technology: This feature allows the thermostat to learn how long the furnace and air conditioner take to reach programmed temperature settings, so the temperature is reached at the time you set. For example: Set the Wake time to 6 am, and the temperature to 70. The heat will come on before 6 am, so the temperature is 70 by the time you wake at 6. The message Recovery is displayed when the system is activated before a scheduled time period.
Compressor Protection: This feature forces the compressor to wait a few minutes before restarting, to prevent equipment damage. During the wait time, the message Wait is displayed on screen. Auto Changeover: This feature is used in climates where both air conditioning and heating are used on the same day. When the system is set to Auto, the thermostat automatically selects heating or cooling depending on the indoor temperature. Heat and cool settings must be at least 3 degrees apart. The thermostat will automatically adjust settings to maintain this 3-degree separation.
CAUTION: To avoid possible compressor damage, do not use Auto Changeover if the outside temperature drops below 50F (10C).
Battery replacement/Customer assistance About your new thermostat
Grasp thermostat and pull to remove fom wallplate
Batteries are optional (to provide backup power) if your thermostat was wired to run on AC power when installed. Install fresh batteries immediately when the LO BATT warning begins flashing. The warning flashes about 30 days before batteries are depleted.

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Even if the warning does not appear, you should replace batteries once a year, or before leaving home for more than a month. For assistance with this product, please visit http://DIYthermostats.honeywell.com or call Honeywell Customer Care toll-free at 1-800-468-1502.

Insert 3 fresh AAA alkaline batteries 69-2220EF01 18

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In case of difficulty
If you have difficulty with your thermostat, please try the following suggestions. Most problems can be corrected quickly and easily.
Display is blank Check circuit breaker and reset if necessary. Make sure power switch at heating & cooling system is on. Make sure furnace door is closed securely. If thermostat is battery powered, make sure fresh AAA alkaline batteries are correctly installed (see page 18).
Button on lower right of screen is blank
This button will remain blank unless the furnace filter change reminder is activated (see System Setup in your Installation Guide).
Heating or cooling system does not respond Press SYSTEM to set system to Heat. Make sure the temperature is set higher than the Inside temperature. Press SYSTEM to set system to Cool. Make sure the temperature is set lower than the Inside temperature. Check circuit breaker and reset if necessary. Make sure power switch at heating & cooling system is on. Make sure furnace door is closed securely. If Wait is displayed, the compressor protection timer is on. Wait 5 minutes for the system to restart safely, without damaging the compressor (see page 15).

1-year limited 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 determined to be defective or malfunctions, Honeywell shall repair or replace it (at Honeywells option). If the product is defective, (i) return it, with a bill of sale or other dated proof of purchase, to the place from which you purchased it; or (ii) call Honeywell Customer Care at 1-800-468-1502. Customer Care will make the determination whether the product should be returned to the following address: Honeywell Return Goods, Dock 4 MN10-3860, 1885 Douglas Dr. N., Golden Valley, MN 55422, or whether a replacement product can be sent to you. 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. Honeywells 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 Limite, 35 Dynamic Drive, Toronto, Ontario M1V4Z9.