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 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.
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 ........................
Step 1. Prepare for Installation 1. Check that the following items are included: WALLPLATE Insi de Set 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.
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.
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 W Y RED G GREEN ! DO NOT WIRE NEW THERMOSTAT BASED ON WIRE COLOR.
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. OLD THERMOSTAT WALLPLATE W Y THERMOSTAT G COVER R C L .18 .2 .9 .7 .5 O .25 N G E R .4 .3 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.
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.
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.
Step 4. Follow Special Instructions (Cont) 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.
Step 5. Label Old Thermostat Wires 1. 2. 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.
Step 6. Mount New Wallplate to Wall 1. Separate the wallplate from the thermostat as shown.
Step 6. Mount New Wallplate to Wall (Cont) 2. Pass the labeled wires through the wire hole on the wallplate.
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.
Step 6. Mount New Wallplate to Wall (Cont) 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) WALLPLATE MOUNTING SCREWS (2) M22205 6. 7. 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 Y G C M22206 3. 4.
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.
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.
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 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.
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. Possible letter designations on the labeled wires HEAT PUMP letter designations on the new thermostat 1 RC 2 VR or V or R R 3 H or B, O O/B Y1 or M or Y Y F or G G 3 X or B, C C F or L L X2 or X, E E 4 AUX, W1, W or W2 AUX M22210 Be sure to read the note referenced in the numbered triangles above.
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. 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.
Step 7. Connect Wires to New Wallplate (Cont) 9. Push excess wire back into the wall opening. Keep wires in the shaded area.
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) M22212 Remove the tab labeled “Remove during installation” in the lower right corner of the thermostat back. REMOVE DURING INSTALLATION REMOVE TAB REMOVE DURING INSTALLATION 2.
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. 3. 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.
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 MON TUE WED W THU FRI DONE USE ARROWS TO SET YEAR M22226 The calendar can be set any time.
Step 10. Set the Calendar (Cont) 3. 4. Use the arrow keys to set the current time. Press the Done key.
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.
Step 11. Configure Installer Setup (Cont) 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 Following Schedule SYSTEM EM HEAT OFF COOL PM DONE CANCEL M19969 4. Release the center key when the display on your thermostat matches the display below.
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.
Step 11. Configure Installer Setup (Cont) 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.
Step 11. Configure Installer Setup (Cont) 10. 11. 12. If you do not have a number 0180 on the left side of your display, go to the next page. 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. After you select your setting, press the Up arrow key to go to the next Installer Setup Number.
Step 11. Configure Installer Setup (Cont) 13. 14. 15. If you do not have a number 0190 on the left side of your display, go to the next page. 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. After you select your setting, press the Up arrow key to go to the next Installer Setup Number.
Step 11. Configure Installer Setup (Cont) 16. 17. 18. If you do not have a number 0240 on the left side of your display, go to the next page. 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. After you select your setting, press the Up arrow key to go to the next Installer Setup Number.
Step 11. Configure Installer Setup (Cont) 19. 20. Press the Up or Down arrow to select your setting for Installer Setup Number 0320. After you select your setting, press the Up arrow to go to the next Installer Setup Number. UP ARROW SETTING INSTALLER SETUP NUMBER UP ARROW DOWN ARROW DONE PRESS TO EXIT INSTALLER SETUP Installer Setup Number 0320 Installer Setup Name (Select Your Setting) Settings Temperature 0 - Fahrenheit Temperature Display. Indication 1 - Celsius Temperature Display.
Step 11. Configure Installer Setup (Cont) 21. 22. Press the Up or Down arrow to select your setting for Installer Setup Number 0330. After you select your setting, press the Up arrow to go to the next Installer Setup Number. UP ARROW SETTING INSTALLER SETUP NUMBER UP ARROW DOWN ARROW DONE PRESS TO EXIT INSTALLER SETUP Installer Setup Number Installer Setup Name 0330 Daylight Savings (Select Your Setting) Settings 0 - Daylight Savings is Off -- clock will not adjust for Daylight Savings Time.
Step 11. Configure Installer Setup (Cont) 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.
Step 11. Configure Installer Setup (Cont) 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. UP ARROW SETTING INSTALLER SETUP NUMBER UP ARROW DOWN ARROW DONE PRESS TO EXIT INSTALLER SETUP Installer Setup Number 0530 Installer Setup Name (Select Your Setting) Settings 0 - Conventional recovery -- system Adaptive starts recovery at programmed Intelligent time.
Step 11. Configure Installer Setup (Cont) 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.
Get to Know Your Thermostat Display Thermostat SYSTEM DOWN ARROW SELECTS EM.
Get to Know Your Thermostat Display (Cont) Display TUE INSIDE TEMPERATURE SHOWS CURRENT DAY OF THE WEEK SHOWS THE CURRENT INSIDE TEMPERATURE SET TO TEMPERATURE FAN SHOWS FAN SETTING SHOWS THE CURRENT SET TEMPERATURE TUE FAN Inside Set To AUTO Following Schedule SYSTEM HEAT AM SCHED HOLD CLOCK SCREEN SYSTEM TIME SHOWS CURRENT SYSTEM POSITION DISPLAY CURRENT TIME OF DAY, HOLD TIME REMAINING OR NUMBER OF VACATION DAYS REMAINING MORE FOLLOWING SCHEDULE SHOWS THE THERMOSTAT IS FOLLOWING THE
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.
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.
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.
Program Your Heating and Cooling Schedule (Cont) 2. Press Edit key.
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. MON FAN ON AUTO CIRC TUE WED THU FRI SAT SUN OK TO PICK MULTIPLE DAYS HEAT CANCEL PERIOD AM DONE WAKE COOL LEAVE RETURN SLEEP CANCEL M22300 4. 5. 6. 7. 8. Press Wake key. Once pressed, Wake flashes to show it is selected.
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. MON TUE WED THU FRI 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.
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.
Set Time Set Time 1. 2. Press Clock. Use the arrows to set the current time. TUE AM DONE CANCEL M19958 3. Press the Done key. The current day of the week should already be set correctly. If not, see Step 11, Configure Installer Setup.
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. 2. 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.
Set Temperature Overrides (Cont) Permanent Hold Permanent Hold changes the temperature setting until Permanent Hold is cancelled. 1. 2. Press the Hold key. “Permanent Hold” appears on the screen. Press the Up or Down arrow next to the temperature you want to set during “Hold.” TUE FAN Inside Set To AUTO SYSTEM HEAT AM Permanent Hold SCHED HOLD CLOCK SCREEN CANCEL M19960 3. Press the Cancel key to cancel “Permanent Hold” and resume the schedule.
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.
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. 3. 4. Use a damp cloth slightly moistened with water or household glass cleaner to clean the screen. Repeat the above steps, as necessary. 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.
Use Your Filter Timer The Filter Timer notifies you when to change your furnace filter. Reset Filter Timer 1. 2. “Change Filter” appears on the screen when the filter timer expires. Press the Reset key to restart the filter timer. MON FAN TUE WED THU FRI SAT AT SUN OK TO PICK MULTIPLE DAYS SCREEN LOCKED CHANGE FILTER R UV LAMP HUMIDIFIER PAD Inside Set To AUTO SYSTEM Following Schedule RESET HEAT PM SCHED HOLD CLOCK SCREEN MORE M19975 View or Reset Timer Settings Before They Expire 1.
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.
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.
Replace Batteries (Cont) 3. Remove the old batteries and insert three fresh AAA alkaline batteries, as marked on the thermostat.
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.
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.
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.
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 40°F to 90°F(4.5°C to 32°C). • Cooling 50°F to 99°F (10°C to 37°C).
Troubleshooting Tips (Continued) If . . . 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. 69-1725-1 Then . . .
Troubleshooting Tips (Continued) 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.
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.
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.
Automation and Control Solutions Honeywell International Inc. 1985 Douglas Drive North Golden Valley, MN 55422 69-1725-1 G.H. Honeywell Limited-Honeywell Limitée 35 Dynamic Drive Scarborough, Ontario M1V 4Z9 Rev. 10-04 www.honeywell.