T8635L Microelectronic Communicating Programmable Thermostat USER’S GUIDE 1 69-1332-4 69-1332—4
CONTENTS USING THIS GUIDE .......................................................................................................................................... 5 FEATURES ........................................................................................................................................................ 6 KEYBOARD AND DISPLAY DESCRIPTION .................................................................................................... Keyboard ..................................
Contents (Cont) Displaying Current Settings ............................................................................................................................ Filter Indicator .................................................................................................................................................... Setting or Resetting Filter Indicator ................................................................................................................ LED Indicators ...........
USING THIS GUIDE The T8635L is a multi-functional thermostat. This means it can be used in several different ways such as single or multi-zone applications, conventional furnaces or heat pump equipment. The following symbols will help you identify the features that apply to your system: – Triple layer of thermostats with the word, zoning, below.
FEATURES • No batteries needed—your thermostat retains the schedule for the life of the product. You never have to reprogram the schedule even after a power outage. (You may need to reset the day and time after an extended power outage.) • Daylight Time key for quick time changes between Daylight and Standard time. • Backlit display for improved readability—set the backlight feature for backlighting on demand (press any key to activate) or continual backlighting. Ask your installer to program this feature.
KEYBOARD AND DISPLAY DESCRIPTION Keyboard The keyboard is located behind the thermostat cover. Three frequently used keys, increase ▲ or decrease ▼ and , are located next to the display. See Fig. 1. Display The thermostat displays important information such as day, time, schedule period, temperature, filter information, system and fan operation. See Fig. 2.
TIME / TIME SETS TIME FORWARD OR BACK WAKE SET WAKE TIMES AND TEMPERATURES LEAVE SET LEAVE TIMES AND TEMPERATURES DIGITAL DISPLAY DECREASE LOWERS TEMPERATURE SETTING SET CURRENT DAY/TIME SETS CURRENT DAY AND TIME INFORMATION DISPLAYS CURRENT HEAT/COOL TEMPERATURE SETTING AND OUTDOOR TEMPERATURE (WHEN INSTALLED).
SHOWS THERMOSTAT IS PROCESSING INFORMATION AND WAITING TO CALL FOR HEAT OR COOL SHOWS SMART RESPONSE IS CHANGING THE TEMPERATURE TO MEET THE CURRENT PROGRAM SHOWS VACATION HOLD DURATION SHOWS FILTER TIMER EXPIRED (TIME TO REPLACE FILTER) SHOWS CURRENT DAY OR DAYS BEING PROGRAMMED SHOWS CURRENT PROGRAM PERIOD OR PERIOD BEING PROGRAMMED SHOWS WHEN THERMOSTAT IS IN THE PROGRAMMING MODE SHOWS THERMOSTAT IS IN THE SET CURRENT DAY/TIME MODE SHOWS TEMPERATURE SETTING CHANGED FOR THIS PROGRAM PERIOD Wait Set Pr
ADAPTIVE INTELLIGENT RECOVERY™ CONTROL Recovery™ control gradually changes the temperature from the energy savings setting to the comfort setting (for example, from a heating temperature of 62° at night to 70° in the morning). Your new thermostat is so smart, it’s almost human. You perceive temperature from a variety of sources, not only from the air in the room, but also from your surrounding walls, windows and furnishings. Humans feel differences in temperature as slight as two degrees Fahrenheit.
After installation or new schedule programming, your thermostat learns from experience. Each day it checks how closely it hit the recovery target (for example, 70° at 6:00 AM) and adjusts the next day’s recovery start time accordingly. After four to eight days, the thermostat has adjusted to local weather, your lifestyle, the construction of your home, and your heating and cooling system. Optimum Comfort and Energy Savings In Fig.
At 7:00 AM System Operating in Comfort Mode System Heat AM TEMPERATURE At 6:00 AM Recovery Continues Fan Mon Wake Room Auto System Heat Recovery Room Mon Sleep System Heat Recovery AM Fan At 5:00 AM Recovery Continues AM Auto 1 Fan Room Mon At 4:00 AM Recovery Begins Sleep Auto System Heat Recovery AM Fan Room Mon Sleep Auto ENERGY SAVINGS PERIOD RECOVERY FROM ENERGY SAVINGS TIME COMFORT PERIOD THE THERMOSTAT USES THE SAME SCHEME TO RETURN GRADUALLY TO LOWER COMFORT TEMPER
OPERATING YOUR THERMOSTAT Your new thermostat saves energy and keeps you comfortable at the same time. By now you may be wondering how to program your thermostat and how to use some more time and energy-saving features. Setting System and Fan Keys Use the System and Fan keys to change the system and fan settings. The fan settings can be set for each schedule period individually. The system selection is for all the schedule periods.
Setting the System Key Press the System key until the desired system (Heat, Off, Cool, or Auto) displays. System HEAT PUMP Heat: The thermostat controls the heating. Off: Both the heating and cooling are off. Cool: The thermostat controls the cooling. Auto: The thermostat automatically changes between heating and cooling operation, depending on the indoor temperature. Em.Ht: Emergency heat is controlled as stage 1 heat. Cooling system is off. Compressor is de-energized.
Setting Temporary Temperatures You can override the current schedule period to temporarily change the temperature setting until the next schedule period, or you can change and hold the temperature setting indefinitely. You can also change the temperature setting until a designated day and period (for example, while you are on vacation). Changing Temperature to Temporary Setting Until Next Schedule Period Press increase ▲ or decrease ▼ until the desired temperature setpoint displays.
Press the Run Program key to cancel the temporary temperature setting before the designated time. Run Temporary System Heat AM Program Fan Mon Heat Auto M14564 After selecting a temporary setting, the display reads “Temporary” until canceled. Example display shows temporary heat setting of 70° at 6:00 AM. 60 90 90 60 70 80 70 80 If ▲ or ▼ appears under the temperature display, it means that both the heating and cooling setpoints are being adjusted.
Changing and Holding Temperature Setting Indefinitely 1. Press Hold Temp key once. Hold Temp Setting 2. Press increase ▲ or decrease ▼ to change the temperature setpoint, if desired. NOTE: The display changes from the setpoint to the room temperature after approximately three seconds. Press Run Program key to cancel hold. System Heat Fan Heat Auto M14565 Press Hold Temp key once to display the thermostat in Hold mode. Example display shows temporary heat setting of 60°.
Changing Temperature Setting Until a Designated Day and Period (Vacation Hold) ZONING When setting Vacation Hold at any thermostat, all thermostats automatically change to Vacation Hold except if a thermostat is already set to Hold. Setting Hold for Days 1. Press Hold Temp key twice. System Heat Hold Temp Fan Heat Wake Auto M14833 Press Hold Temp key twice to display the thermostat in Vacation mode. Example display shows temporary heat setting of 60°.
Press Wake, Leave, Return or Sleep key to select the period the Hold ends. Wake Leave Return System Heat Setting Sleep Hold for Days Fan Heat Return Auto M14571 In this example, the Hold ends after the 18th day at the beginning of the Return period. 4. Press increase ▲ or decrease ▼ to adjust the temperature setting, if desired. NOTE: Only the heating temperature is used when the System is set to Heat. Similarly, only the cooling temperature is used when the System is set to Cool.
5. Press Heat/Cool Settings key to change between heat and cool settings. Heat/Cool Settings 6. Press increase ▲ or decrease ▼ to adjust the temperature setting, if desired (for example, if cool is set at 84°, cooling equipment operates when the room temperature is above 84°F). To cancel the Vacation Hold before the designated time, press Run Program key at each thermostat. ZONING Pressed the wrong key? Want to start over? Don’t worry! Run You can always press Program to return display to normal.
Using the (Information) Key System Em Heat The (information) key provides information at your fingertips. The sequence of key presses is: • Outdoor temperature (if equipped). • Current setpoint of mode in use (Heat or Cool). • Setpoint of mode not currently in use. • Filter status. AM Fan Tue Wake Room DST Auto INFORMATION KEY If the filter status is expired, refer to Filter Indicator section, the sequence of • Filter status. • Outdoor temperature (if equipped).
Displaying Current Settings Press key twice to check the current temperature setpoint. Press ture setpoint of the mode not currently in use. 60 90 90 60 70 80 70 80 Without outdoor temperature sensor, press twice for opposite setpoint. key three times to check the tempera- key once to display current setpoint; press If the filter status is expired, press key three times to check current temperature setpoint, if equipped with outdoor sensor.
Filter Indicator Your thermostat monitors the time the fan is running and lets you know when to replace the filter, based on the number of fan run-time days you select. Upon expiration, the thermostat displays “Filter” and the green LED lights (on the top right of the thermostat). 60 90 90 60 70 80 70 80 System Em Heat AM Filter Tue Wake One fan run-time day equals twenty-four hours of fan run time.
2. Press and hold the Filter key for at least three seconds to reset the fan run time. Filter Setting Filter Days M17762A Hold down the Filter key to reset the counter. 3. Press Time or Time until the desired number of days displays (0, 15, 30, 60, 90, or 120 ). TIME 4. Press Run Program key to return to normal operation. Run Program IMPORTANT To track the time the fan is running, you must select a setting other than 0 (0 means off).
FILTER (GREEN) LED CHECK (RED) LED LED Indicators Two light emitting diode (LED) indicators are located on the upper right side of the thermostat. The LED indicators are clear until lighted. When the right filter expiration LED indicator lights (green), see the Filter Indication section; when the heat pump check LED indicator lights (red), see the Troubleshooting section. HEAT PUMP The Check LED indicates a failure detected with the heat pump. Switch the thermostat to Em. Ht.
SETTING THE CLOCK Setting Current Day and Time Seting the time and day at one thermostat automatically sets the time and day on all thermostats. ZONING IMPORTANT Always press the keys with your fingertip or similar blunt tool. Sharp instruments like pens and pencil points can damage the keyboard. On initial power up or after an extended power loss, 1:00 PM flashes on the display until a key is pressed. 1. Press Set Current Day/Time key.
2. Press Day key until the current day displays. 60 90 90 60 70 80 70 80 Day Set Day/Time Mon = Monday, Tue = Tuesday, Wed = Wednesday, Thu = Thursday, Fri = Friday, Sat = Saturday, Sun = Sunday. PM Tue M14581 Press Day key to set the current day. Example display shows Tuesday. 3. Press Time or Time key until the current time displays. TIME 60 90 90 60 70 80 70 80 Tap the Set Current Day/Time key to advance the time in one-hour increments. Set Current Set Day/Time AM Day/Time 4.
Daylight Saving Time Set Day/Time AM NOTE: If the current time is Daylight Saving Time, press Daylight Time key to display DST. Daylight Time Tue DST M14583 Press Daylight Time key to set Daylight Saving Time. 60 90 90 60 70 80 70 80 Pressing Daylight Time key more than once within a five minute period scrolls you through various time options (example: one hour earlier or later with or without DST). Pressing Daylight Time key six times in a five minute period returns you to your original setting.
PROGRAMMING YOUR THERMOSTAT 7-Day Program and Operation Your thermostat is 7-day programmable. 7-day programming means you can set your thermostat for four periods (Wake, Leave, Return and Sleep) and up to eight temperatures (four Heat and four Cool) for each day of the week. Each day can be the same or different. Program Periods: WAKE The program period when you want the house at a comfortable temperature when you get up and while you get ready for work or school.
7-Day Preprogrammed Schedule Your thermostat is preprogrammed with the schedule shown in Table 1 (same schedule for all days of the week). You may keep this schedule or develop your own. Before starting the programming procedure, use Table 2 to plan your schedule. Instructions: 1. Write the time you want for each program period. 2. Write the heating and cooling temperatures you want for each period. 3. Draw a circle around the fan operation you desire for each period. Table 1. 7-Day Preprogrammed Schedule.
Customizing Your Own 7-Day Schedule Table 2. Your 7-Day Schedule.
60 90 90 60 70 80 70 80 About Power Outages Don t worry! Your thermostat retains the schedule (preprogrammed or your own) for the life of the product. The time and day information is retained for a minimum of twenty minutes during a power outage. After a longer power outage, you may need to set the current time and day ( 1:00 PM flashes on the display), but the schedule is retained.
1. Press the Wake key. Wake Setting Set Program System Heat AM Fan Tue Wake Heat Auto M14586 Press the Wake key to enter the program mode. Example display shows 6:00 AM on Tuesday with Heat set to 70°F. 2. Press Day key until the desired day displays. Day Setting Set Program System Heat AM Fan Mon Wake Heat Auto M14588 Press Day key to select the day to program. Example display shows Monday is selected and ready to program.
3. Press Time or Time time displays. key until the desired Wake System Heat Setting Set Program AM TIME Fan 60 90 90 60 70 80 70 80 The program times are in fifteen-minute intervals; for example, 8:00, 8:15, 8:30. Mon Wake Heat Auto M14589 Press the Time or Time key to select the time the Wake period will begin. Example display shows the Wake period will begin at 6:30 AM. 4. Press increase ▲ or decrease ▼ key until the desired Wake temperature displays.
5. Press Fan key to modify fan operation. Selecting Auto means the fan runs only when the heating or cooling equipment is operating. Selecting On means the fan runs continuously for the entire schedule period. 6. Press Heat/Cool Settings key to make selections for the opposite system setting (either Heat or Cool).
7. Press increase ▲ or decrease ▼ key until the desired temperature setpoint displays. System Heat Setting Set Program AM Fan Mon Wake Cool Auto M14592 Press increase ▲ or decrease ▼ to select the cooling Wake temperature. Example display shows the cooling Wake period set for 76°. 8. Press Leave, Return or Sleep and repeat steps 3 through 6 to program the entire day. The day (first day of a 7-day schedule) is now programmed.
Copying a Day 60 90 90 60 70 80 70 80 The thermostat must be in the program mode to use the copy feature. Go to step 2 if the thermostat is already in the program mode (set program displays in the upper left corner). 1. Press Wake, Leave, Return or Sleep key to enter program mode. 2. Press Day key to select the day to copy from. Wake Leave Return Setting Set Program Day Sleep System Heat AM Fan Mon Wake Heat Auto M14590 Press Day key to select the day schedule to copy.
3. Press Copy key. Copy Mon M14594 Press Copy key to copy a day schedule into memory. Example display shows Monday schedule was copied into memory. 4. Press Day key until the day to be copied to is displayed. Day Mon Wed M14595 Press Day key again to select the day to copy to. Example display shows Monday and Wednesday. Because Monday was already selected, Monday schedule will be copied to Wednesday.
5. Press Copy key. Copy NOTE: “donE” displays for two seconds before the normal display returns. M14596 Press the Copy key again to complete the copy command. Example display shows “donE”. Monday schedule was successfully copied to Wednesday (Monday and Wednesday now have the same schedule). 6. Repeat steps, as necessary, for all the periods and days desired. 7. Press Run Program key to return to normal operation.
Clearing a Program Period 60 90 90 60 70 80 70 80 The thermostat must be in the program mode to use the clear feature. Go to step 2 if the thermostat is already in the program mode (Set Program displays in upper left corner). Setting Set Program System Heat AM Fan Mon 1. Press Leave, Return or Sleep key to enter program mode. Leave Return Sleep On Heat Leave M14597 Press Leave, Return, or Sleep to enter the program mode.
3. Press and hold Leave, Return or Sleep key until the start time and temperature setting are cleared (approximately three seconds). Leave Return Sleep Setting Set Program Sat NOTE: Wake cannot be cleared. Leave Heat M14599 Press and hold Leave, Return or Sleep key to clear the period for that day. Example display shows Saturday Leave period cleared. 60 90 90 60 70 80 70 80 You do not have to program a replacement time for the remaining periods; for example, Wake and Sleep.
TROUBLESHOOTING Symptom Possible Cause Action Display does not come on. Thermostat is not being powered. Check if the thermostat is mounted and latched on the wallplate—mount and latch the thermostat on the wallplate. Check if the circuit breaker is tripped—reset the circuit breaker. Check if the fuse at the fuse box is blown—replace the fuse. Check if the system switch at the equipment is in the Off position—set to the On position.
Troubleshooting (Cont) Symptom Cooling does not come on. Possible Cause No power to the thermostat. System selection is not set to Cool. Cooling setpoint is above room temperature. Action Check that setpoint is below room temperature. Check if the circuit breaker is tripped—reset the circuit breaker. Check if the fuse at the fuse box is blown—replace the fuse. Check if the System switch at the equipment is in the Off position—set to the On position.
Troubleshooting (Cont) Symptom Outdoor temperature not displayed or is incorrect. Possible Cause Installer did not activate this option. Outdoor sensor is connected incorrectly. Action Contact installer or service technician. 1 COM, 2 COM, or 3 COM is displayed. The thermostat is unable to communicate with the equipment interface module located at the furnace. Turn the power off and then on to your furnace. If the problem persists, call your local heating and air conditioning dealer for assistance.
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.
Warranty (Cont) 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.
CUSTOMER ASSISTANCE After reading this guide, if you have any questions about the operation of your thermostat, please visit the Honeywell website at www.honeywell.com/yourhome. For service, contact your local heating and cooling contractor.
Automation and Control Solutions Honeywell International, Inc. Honeywell Limited-Honeywell Limitée 35 Dynamic Drive 1985 Douglas Drive North Scarborough, Ontario Golden Valley, MN 55422 M1V 4Z9 69-1332—4 G.H. Rev. 02-03 Printed in U.S.A. on recycled paper containing at least 10% post-consumer paper fibers.
