Honeywell T8635L User Manual

Honeywell T8635L User Manual

Microelectronic communicating programmable thermostat
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T8635L Microelectronic Communicating
Programmable Thermostat
USER'S GUIDE
69-1332-3
1
69-1332—3

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Summary of Contents for Honeywell T8635L

  • Page 1 T8635L Microelectronic Communicating Programmable Thermostat USER’S GUIDE 69-1332-3 69-1332—3...
  • Page 2 69-1332—3...
  • Page 3: Table Of Contents

    Keyboard ... Display ... ADAPTIVE INTELLIGENT RECOVERY™ CONTROL ... 10 Optimum Comfort and Energy Savings……………………………………………………………………………….. 11 OPERATING YOUR THERMOSTAT ... 13 Setting System and Fan Keys ... 13 Setting the System Key ... 14 Setting the Fan Key ... 14 Setting Temporary Temperatures ...
  • Page 4 Remote Override Temperature Indicator ... SETTING THE CLOCK ... Set Current Day and Time ... Daylight Saving Time ... PROGRAMMING YOUR THERMOSTAT ... 7-Day Program and Operation ... 7-Day Preprogrammed Schedule ... Customizing Your Own 7-Day Schedule ... Programming the First Day ...
  • Page 5: Using This Guide

    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: –...
  • Page 6: Features

    (C7089B Outdoor Temperature Sensor optional accessory), the current setpoints, or the filter status. • 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.)
  • Page 7: Keyboard And Display Description

    The keyboard is located behind the thermostat cover. Three frequently used keys, increase or decrease , 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. 69-1332—3...
  • Page 8 Set Program Heat/Cool Filter Settings Daylight Copy Time HEAT/COOL SETTINGS SWITCHES BETWEEN HEAT SETPOINTS AND COOL SETPOINTS WHILE PROGRAMMING Fig. 1. Thermostat keyboard description. DIGITAL INCREASE DISPLAY RAISES TEMPERATURE SETTING DECREASE LOWERS TEMPERATURE SETTING INFORMATION DISPLAYS CURRENT HEAT/COOL TEMPERATURE SETTING...
  • Page 9 AND CONVENTIONAL SHOWS RECOVERY IS ON TEMPERATURE DISPLAYED IS THE CURRENT ROOM DISPLAYS EITHER ROOM TEMPERATURE OR SET TEMPERATURE Fig. 2. Example of thermostat display. SHOWS SHOWS TEMPERATURE TEMPERATURE DISPLAYED IS THE CURRENT SETTING CHANGED SET TEMPERATURE FOR THIS PROGRAM...
  • Page 10: Adaptive Intelligent Recovery™ Control

    ADAPTIVE INTELLIGENT RECOVERY™ CONTROL 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.
  • Page 11: Optimum Comfort And Energy Savings

    (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.
  • Page 12 Auto ENERGY SAVINGS PERIOD THE THERMOSTAT USES THE SAME SCHEME TO RETURN GRADUALLY TO LOWER COMFORT TEMPERATURE DURING THE COOLING SEASON. IF In Recovery IS DISPLAYED, PRESS Fig. 4. Explanation of Adaptive Intelligent Recovery™ control. At 7:00 AM System Operating in Comfort Mode...
  • Page 13: Operating Your Thermostat

    You can even program the thermostat to return to your regular programming schedule on your last day of vacation so you are comfortable when you return and yet save energy while you are away.
  • Page 14: Setting The System Key

    ZONING changes the system setting in all zones. For example, changing the zone 1 thermostat from Heat to Cool causes all thermostats to change from Heat to Cool. Em.Ht: Emergency heat is controlled as stage 1 heat. Cooling system is off.
  • Page 15: Setting Temporary Temperatures

    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...
  • Page 16 Press the Run Program key to cancel the temporary temperature setting before the designated time. appears under the temperature display, it means that both the heating and cooling setpoints are being adjusted. Tapping the increase and cool setpoints by one degree. Press the setpoints.
  • Page 17: Changing And Holding Temperature Setting Indefinitely

    Press Run Program key to cancel hold. Hold Temp to change the tempera- mode. Example display shows temporary heat setting of 60°. Program Heat Press Hold Temp key once to display the thermostat in Hold System Setting Heat Auto M14565...
  • Page 18: Changing Temperature Setting Until A Designated Day And Period (Vacation Hold)

    (1 to 255 days) displays. Hold for Hold Temp Wake Press Hold Temp key twice to display the thermostat in Vacation mode. Example display shows temporary heat setting of 60°. until the desired Hold for TIME Wake Press the Time days.
  • Page 19 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. The thermostat uses both the heating and cooling temperatures when the System is set to Auto.
  • Page 20 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 to adjust the temperature setting, if desired (for example, if cool is set at...
  • Page 21: Using The (Information) Key

    Using the (Information) Key (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. •...
  • Page 22: Displaying Current Settings

    Displaying Current Settings Press key twice to check the current temperature setpoint. Press ture setpoint of the mode not currently in use. Without outdoor temperature sensor, press twice for opposite setpoint. If the filter status is expired, press three times to check current temperature setpoint, if equipped with outdoor sensor.
  • Page 23: Filter Indicator

    Upon expiration, the thermostat displays “Filter” and the green LED lights (on the top right of the thermostat). One fan run-time day equals twenty-four hours of fan run time. For example, if the...
  • Page 24 2. Press and hold the Filter key for at least three seconds to reset the fan run time. 3. Press Time or Time (0, 15, 30, 60, 90, or 120 ). 4. Press Run Program key to return to normal operation. IMPORTANT To track the time the fan is running, you must select a setting other than 0 (0 means off).
  • Page 25: Led Indicators

    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.
  • Page 26: Setting The Clock

    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.
  • Page 27 2. Press Day key until the current day displays. Mon = Monday, Tue = Tuesday, Wed = Wednesday, Thu = Thursday, Fri = Friday, Sat = Saturday, Sun = Sunday. 3. Press Time or Time TIME Tap the Set Current Day/Time key to advance the time in one-hour increments.
  • Page 28: Daylight Saving Time

    Daylight Saving Time NOTE: If the current time is Daylight Saving Time, press Daylight Time key to display “DST.” 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).
  • Page 29: 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.
  • Page 30: 7-Day Preprogrammed Schedule

    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.
  • Page 31: Customizing Your Own 7-Day Schedule

    Customizing Your Own 7-Day Schedule WAKE SUNDAY TIME AUTO MONDAY TIME AUTO TUESDAY TIME AUTO WEDNESDAY TIME AUTO THURSDAY TIME AUTO FRIDAY TIME AUTO SATURDAY TIME AUTO Table 2. Your 7-Day Schedule. LEAVE TIME TIME AUTO TIME TIME AUTO TIME TIME AUTO TIME...
  • Page 32: Programming The First Day

    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”...
  • Page 33 1. Press the Wake key. Wake 2. Press Day key until the desired day displays. Set Program Wake Press the Wake key to enter the program mode. Example display shows 6:00 AM on Tuesday with Heat set to 70°F. Set Program Wake Press Day key to select the day to program.
  • Page 34 3. Press Time or Time time displays. TIME The program times are in fifteen-minute intervals; for example, 8:00, 8:15, 8:30. 4. Press increase or decrease Wake temperature displays. The setpoint temperature range is 40 to 90°F (4 to 32°C) for heating and 55 to 99°F (13 to 37°C) for cooling.
  • Page 35 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).
  • Page 36 7. Press increase or decrease temperature setpoint displays. 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. IMPORTANT Repeat steps 1 through 7 for each day of the week that has a different schedule from the first day. Or refer to Copying a Day section to copy any programmed day to another day.
  • Page 37: Copying A Day

    Copying a Day 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.
  • Page 38 3. Press Copy key. Copy 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. M14595 Press Day key again to select the day to copy to. Example display shows Monday and Wednesday.
  • Page 39 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).
  • Page 40: Clearing A Program Period

    Clearing a Program Period The thermostat must be in the program mode to use the clear feature. Go to step 2 if the thermo- stat is already in the program mode (Set Program displays in upper left corner). 1. Press Leave, Return or Sleep key to enter program mode.
  • Page 41 You do not have to program a replacement time for the remaining periods; for example, Wake and Sleep. If you clear only the Leave and Return periods for Saturday (or any day), the thermostat remains in the Wake period for all of Saturday until the Sleep period.
  • Page 42: Troubleshooting

    Heating setpoint is below room temperature. Possible Cause 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.
  • Page 43 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. Wait five minutes for the system to respond (thermostat displays “ Wait”). Set System selection to Cool.
  • Page 44 Outdoor sensor is connected incorrectly. Filter expired. “no com” is displayed. The thermostat is unable to communicate with the equipment interface module located at the furnace. is flashing and there is When using the thermostat in no air coming from the zoning applications, the register.
  • Page 45: Warranty

    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.
  • Page 46 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 our Honeywell Customer Relations, 1985 Douglas Drive North, Golden Valley, MN 55422.
  • Page 47: Customer Assistance

    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. 69-1332—3...
  • Page 48 Honeywell 1985 Douglas Drive North Golden Valley, MN 55422 69-1332—3 G.H. Rev. 12-01 Automation and Control Solutions Honeywell Limited-Honeywell Limitée 35 Dynamic Drive Scarborough, Ontario M1V 4Z9 Printed in U.S.A. on recycled paper containing at least 10% post-consumer paper fibers.

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