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Honeywell T8631A Owner's Manual

Owner's manual
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See also: Installation Manual
Chronotherm III
for Comfort and Convenience
OWNER'S GUIDE
Congratulations! You made a smart choice when you purchased your new Honeywell Communicating
Chronotherm III Thermostat. It's the smart thermostat that:
Keeps you comfortable by automatically calculating exactly when the furnace or air conditioning
should go on to have the house at the desired comfort temperature by the time you wake up.
Saves the maximum amount of energy and money by remembering to automatically set back the heat
or air conditioning when you leave home.
Provides the ultimate in comfort and convenience by coming to you already programmed. But it's your
choice—use the preprogrammed schedule or set your own.
Can be connected to a Honeywell's TotalHome system for external access and control. TotalHome
system devices communicate using HBus, a Honeywell communications protocol.

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Summary of Contents for Honeywell T8631A

  • Page 1 Provides the ultimate in comfort and convenience by coming to you already programmed. But it’s your choice—use the preprogrammed schedule or set your own. Can be connected to a Honeywell's TotalHome system for external access and control. TotalHome system devices communicate using HBus, a Honeywell communications protocol.
  • Page 2 Features Check status light to see if the thermostat Monitor thermostat operation; read is on, even in the dark. current time and room temperature at a glance. Set different Set the schedules for temperature weekdays, warmer or Saturday, and cooler with the Sunday.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS Programming Your Thermostat ......1-13 Adaptive Intelligent Recovery™ ......25-28 Setting the current day and time ......1 Selecting Recovery Setting ........ 29-30 Setting the program schedule and heating tempera- tures ..............2 Heat Pumps with Supplemental Heat ....31-32 Setting the cooling temperatures ......

  • Page 4: Programming Your Thermostat

    The thermostat requires a program shows the desired starting time. If MON TUE WED THU FRI ON HEAT for WAKE. You can program using T8631A in Conventional BACK WAKE LEAVE, RETURN and SLEEP or Recovery ( visible in display). See not, as you please.
  • Page 5 RETURN Press and hold until the display shows the desired starting time. AHEAD MON TUE WED THU FRI ON HEAT T8631A using Conventional Recov- RETURN ery ( visible in display) should be BACK set 30 or more minutes ahead of desired comfort time.
  • Page 6 PROGRAMMING YOUR THERMOSTAT Press and hold until the display shows the desired temperature. WARMER MON TUE WED THU FRI ON HEAT SLEEP COOLER Set the SATURDAY schedule. Use Press and release until SAT appears the same procedure as for week- on the display.

  • Page 7: Setting The Cooling Temperatures

    PROGRAMMING YOUR THERMOSTAT STEP 3 Press and release. The display WAKE SETTING THE COOLING shows WAKE, the time and tempera- ON HEAT TEMPERATURES ture you programmed for heating. WAKE The program times are the same for both heating and cooling. Only Press and release so COOL shows HEAT/COOL the cooling temperatures need to...
  • Page 8 PROGRAMMING YOUR THERMOSTAT Press and hold until the display shows the desired temperature. WARMER MON TUE WED THU FRI COOL RETURN COOLER Program the SLEEP temperature if Press and release. The display SLEEP desired. shows SLEEP, the time programmed MON TUE WED THU FRI COOL for heating and 78 F.

  • Page 9: Setting The System And Fan Switches On The Subbase

    SWITCHES ON THE SUBBASE or for more efficient electronic air AUTO cleaning. The fan runs continuously. The T8631A does not have the EM. HT. switch position. Note the FAN AUTO: Normal setting for most positions provided on your sub- homes and businesses. T8631A: the...

  • Page 10: Operating Your Thermostat

    PROGRAMMING YOUR THERMOSTAT HEAT: The thermostat controls your heating system. EM. HT. HEAT OFF COOL OFF: Both your heating and cooling systems are off. EM. HT. HEAT OFF COOL COOL: The thermostat controls your cooling system. EM. HT. HEAT OFF COOL You have finished programming your thermostat.

  • Page 11: Permanently Changing The Program

    OPERATING YOUR THERMOSTAT To temporarily raise or lower the Press and hold until the desired temperature for the current period temperature is reached. The display WARMER only. will flash TEMPORARY until the next COOLER programmed time period starts. Press and release to cancel any of If you change your mind.

  • Page 12: Canceling Program Settings

    OPERATING YOUR THERMOSTAT Press and hold the desired period CANCELING PROGRAM SLEEP key until the time and temperature SETTINGS MON TUE WED THU FRI ON HEAT clear from the display (about 3 LEAVE seconds). The thermostat requires time and LEAVE temperature settings in the WAKE period, but any of the other periods can be canceled.

  • Page 13: Checking The Current Temperature Setting

    The T8631 Communicating period key, then the WARMER or Chronotherm III Thermostat can COOLER key. Use the RUN be connected to a Honeywell PROGRAM key to change from TotalHome system for external external system control to thermo- access and control.

  • Page 14: Maintaining Your Thermostat

    MAINTAINING YOUR THERMOSTAT REMOVING THE THERMOSTAT 2 Pull out the thermostat from the 1 Loosen the two captive screws at 3 Lift the thermostat up and off the bottom. the bottom corners of the case. base. SYSTEM TEMPERATURE PRESENT PROGRAM SETTING PERIOD TIME...

  • Page 15: Replacing The Batteries

    MAINTAINING YOUR THERMOSTAT REPLACING THE BATTERIES Your thermostat uses three AAA alkaline batteries. The display will flash REPL BAT when the batteries get low. You won’t have to reprogram the thermostat if you insert the new batteries within 20-30 seconds of taking out the old ones.

  • Page 16: Adaptive Intelligent Recovery

    ADAPTIVE INTELLIGENT RECOVERY™ ADAPTIVE INTELLIGENT RECOVERY™—BREAK- THROUGH TECHNOLOGY SENSES TEMPERATURE MORE LIKE YOU DO M 168 Your new thermostat is so smart, Your body perceives temperature from a variety of sources, not only from it’s almost human. the air in the room, but also from your surroundings—walls, windows and furnishings.
  • Page 17 The thermostat calculates the LEAVE/RETURN recovery separately from the SLEEP/WAKE recovery. With the T8631A, you can choose whether you want to use Adaptive Intelligent Recovery™ or conventional recovery. Use the Adaptive Intelligent Recovery setting if you want to choose the exact time that the room reaches your comfort temperature.

  • Page 18: Selecting Recovery Setting

    SELECTING RECOVERY SETTING Your T8631A Thermostat includes a screw on the back marked 2A, allowing for the Adaptive Intelligent Recov- ery™/Conventional Recovery choice. Your thermostat was shipped from the factory with the screw positioned for Adaptive Intelligent Recovery setting. Your installer may have left the screw in this position, or may have changed it to Conventional Recovery.

  • Page 19: Heat Pumps With Supplemental Heat

    HEAT PUMPS ARE DIFFERENT (T8631R) Heat pump systems usually have a supplemental, second stage heating system that operates only when necessary . The Honeywell Chronotherm III Thermostat for heat pumps is designed to minimize the more expensive second-stage operation, indicated by the green AUX light on the switching subbase.

  • Page 20: Answering Common Questions About The Chronotherm Iii Thermostat

    Many factors affect your comfort and energy TotalHome system. savings. If those factors, such as weather, humidity, 7. How can the T8631A Thermostat save energy etc. were always consistent, an unchanging program when it comes on and off so many times early in would work just fine.
  • Page 21 How? Set the desired WAKE program temperature. T8631A has screws on the back of the thermostat Set the WAKE program time 30 to 60 minutes before that will allow you to turn off Adaptive Intelligent the time you normally get up.

  • Page 22: Saving Energy Across The U.s

    SAVING ENERGY ACROSS THE U.S. Save up to 30% in energy costs. Chronotherm III If the time period you choose for setback is longer, Thermostats offer you complete comfort and a low- you may see even greater energy savings. The cost easy way to save on your energy bills.

  • Page 23: Glossary

    15% - 27% M 211B GLOSSARY HBus Adaptive Intelligent Recovery A Honeywell proprietary communications protocol. The time when the thermostat operates the heating or cooling equipment to return the house from the energy Period key savings to the comfort temperature. The thermostat One of the four keys—WAKE, LEAVE, RETURN or...
  • Page 24 Sundays. TotalHome Time period A Honeywell system that lets you control your home One of four program periods: WAKE, LEAVE, RETURN environment from a user interface panel. Depending on and SLEEP available with the Chronotherm III Thermo- the system chosen, you can also use a touchtone stat.

  • Page 25: Your Personal Program

    YOUR PERSONAL PROGRAM You can use the tables below to plan your schedule program a daytime energy savings period, leave the before you begin programming. If you choose not to LEAVE and RETURN periods blank. Weekday Program START HEATING COOLING PERIOD TIME TEMPERATURE...

  • Page 26: Troubleshooting Guide

    WAKE and RETURN start times so the house will be at the desired temperature when the period starts. Check if T8631A is set for Conventional Recovery ( visible on display) or Adaptive Intelligent Recovery.

  • Page 27: Quick Reference To The Keys

    QUICK REFERENCE TO THE KEYS Press these keys to: Begin the current day or time PRESENT programming. DAY/TIME Set the day of the week and select the program day during program- ming. Select the time period to program or LEAVE WAKE review.

  • Page 28: Index

    INDEX Accessing external system control ......20 Fan switch ..............12 Adaptive Intelligent Recovery ......25-28,40 Features ................ * Auxiliary heat light ............41 Flashing display ............45 Batteries, replacement ..........23 Glossary ..............40-42 Blinking display ............3,10 HBus ................40 Canceling programs ............

  • Page 29: Warranty

    Honeywell warrants this thermostat, 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.
  • Page 30 Residential and Residential and Helping You Control Your World Building Controls Division Building Controls Division Honeywell Inc. Honeywell Limited—Honeywell Limitée 1985 Douglas Drive North 740 Ellesmere Road Golden Valley, Minnesota 55422 Scarborough, Ontario M1P 2V9...

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Chronotherm iii

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