Residential and Building Controls Division Honeywell Inc. 1985 Douglas Drive North Golden Valley, Minnesota 55422 Residential and Building Controls Division Honeywell Limited—Honeywell Limitée 740 Ellesmere Road Scarborough, Ontario M1P 2V9 Helping You Control Your World 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.
Features Monitor thermostat operation; read current time and room temperature at a glance. Check status light to see if the thermostat is on, even in the dark. Set different schedules for weekdays, Saturday, and Sunday. Set the temperature warmer or cooler with the touch of a key. Choose manual or programmed thermostat operation. Bypass the stored program for a single period. Choose system and fan operation with the thermostat switches (on subbase).
TABLE OF CONTENTS Programming Your Thermostat ........................... 1-13 Setting the current day and time ............................. 1 Setting the program schedule and heating temperatures .................................................................... 2 Setting the cooling temperatures ............................ 7 Setting the system and fan switches on the subbase ............................................................ 12 Adaptive Intelligent Recovery™ ........................
PROGRAMMING YOUR THERMOSTAT STEP 1 SETTING THE CURRENT DAY AND TIME You can program this thermostat only on the wall with 24 Vac applied to R and C terminals. Always press the keys with your fingertip or similar blunt tool. Sharp instruments like a pen or pencil point can damage the keyboard. SET PRESENT DAY/TIME DAY AHEAD Press and release. The display shows 1:00 PM Mon. PM MON Press and hold until the current day appears in the display.
PROGRAMMING YOUR THERMOSTAT WARMER Press and hold until the display shows the desired temperature. AM MON TUE WED THU FRI SET PT ON HEAT WAKE COOLER Program the LEAVE time and temperature, if desired. NOTE: You can cancel the LEAVE, RETURN or SLEEP program by holding down the key until the time and temperature disappear from the display. LEAVE AHEAD If the display starts to blink while you are holding down TEMPERATURE WARMER or COOLER, you have reached the setting limit. Press and release.
PROGRAMMING YOUR THERMOSTAT WARMER Press and hold until the display shows the desired temperature. SET PT PM MON TUE WED THU FRI ON HEAT SLEEP COOLER Set the SATURDAY schedule. Use the same procedure as for weekdays. DAY Press and release until SAT appears on the display. SET PT PM SAT ON HEAT SLEEP WAKE Press WAKE, LEAVE, RETURN or SLEEP to select the time period. SLEEP AHEAD LEAVE RETURN Press the AHEAD/BACK keys to set the time and the WARMER/COOLER keys to set the temperature.
PROGRAMMING YOUR THERMOSTAT STEP 3 SETTING THE COOLING TEMPERATURES The program times are the same for both heating and cooling. Only the cooling temperatures need to be programmed if you have already programmed for heating. If you change program times for cooling, you are also changing them for heating! To set times as you program the cooling temperatures, use the TIME AHEAD and BACK keys as described in Step 2. WAKE Press and release.
PROGRAMMING YOUR THERMOSTAT WARMER Press and hold until the display shows the desired temperature. SET PT PM MON TUE WED THU FRI COOL RETURN COOLER Program the SLEEP temperature if desired. SLEEP WARMER Press and release. The display shows SLEEP, the time programmed for heating and 78° F. SET PT PM MON TUE WED THU FRI COOL SLEEP Press and hold until the display shows the desired temperature.
PROGRAMMING YOUR THERMOSTAT WARMER COOLER RUN PROGRAM Press the WARMER/COOLER keys to set the temperature. You have completed programming the cooling temperatures. Press and release to start the program. PM SET PT TUE LEAVE Go to Step 4. 11 STEP 4 SETTING THE SYSTEM AND FAN SWITCHES ON THE SUBBASE The T8631A does not have the EM. HT. switch position. Note the positions provided on your subbase, then set the switch(s) as desired. First set the fan switch. Then set the system switch.
PROGRAMMING YOUR THERMOSTAT HEAT: The thermostat controls your heating system. EM. HT. HEAT OFF COOL EM. HT. HEAT OFF COOL EM. HT. HEAT OFF COOL OFF: Both your heating and cooling systems are off. COOL: The thermostat controls your cooling system. You have finished programming your thermostat. Now, while you enjoy precision temperature control, read on to learn about the operating flexibility that makes this thermostat THE SMART CHOICE.
OPERATING YOUR THERMOSTAT To temporarily raise or lower the temperature for the current period only. WARMER COOLER If you change your mind. RUN PROGRAM Press and hold until the desired temperature is reached. The display will flash TEMPORARY until the next programmed time period starts. Press and release to cancel any of the temporary settings.
OPERATING YOUR THERMOSTAT CANCELING PROGRAM SETTINGS The thermostat requires time and temperature settings in the WAKE period, but any of the other periods can be canceled. Weekday, Saturday and Sunday settings are canceled separately. SLEEP LEAVE Press and hold the desired period key until the time and temperature clear from the display (about 3 seconds). MON TUE WED THU FRI ON HEAT LEAVE RETURN RUN PROGRAM Press and release to return to normal operation.
OPERATING YOUR THERMOSTAT CHECKING THE CURRENT TEMPERATURE SETTING Press a single key to compare current room temperature to the setting at any time. PRESENT SETTING Press and release. The display will show the current temperature setting for several seconds, then revert to the room temperature.
MAINTAINING YOUR THERMOSTAT REMOVING THE THERMOSTAT 1 Loosen the two captive screws at the bottom corners of the case. 2 Pull out the thermostat from the bottom. 3 Lift the thermostat up and off the base.
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. To replace: ■ Set the system switch to OFF. ■ Remove the thermostat from the wall. See page 21. ■ Lift the batteries out of the holder.
ADAPTIVE INTELLIGENT RECOVERY™ ADAPTIVE INTELLIGENT RECOVERY™—BREAKTHROUGH TECHNOLOGY SENSES TEMPERATURE MORE LIKE YOU DO M 168 25 Your new thermostat is so smart, it’s almost human. ■ Your body perceives temperature from a variety of sources, not only from the air in the room, but also from your surroundings—walls, windows and furnishings. ■ Human beings feel differences in temperature as slight as two degrees Fahrenheit.
ADAPTIVE INTELLIGENT RECOVERY™ THE OPTIMUM COMFORT AND ENERGY SAVINGS SOLUTION System Operating in Comfort Mode AM REPL SET TEMPERATURE PT PM BAT SUN MON TUE WED THU FRI SAT COOL ON HEAT ON WAKE LEAVE RETURN SLEEP TEMPORARY UNOCCUIPIED AM REPL SET PT PM BAT SUN MON TUE WED THU FRI SAT COOL ON HEAT ON WAKE LEAVE RETURN SLEEP TEMPORARY UNOCCUIPIED Recovery Continues Recovery Begins AM REPL PM BAT SET PT SUN MON TUE WED THU FRI SAT COOL ON HEAT ON WAKE LEAVE RETURN SLEEP TEMPORARY UNOCCUIPIED System
SELECTING RECOVERY SETTING Your T8631A Thermostat includes a screw on the back marked 2A, allowing for the Adaptive Intelligent Recovery™/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. Before programming, you must know which recovery method your thermostat has been set for.
HEAT PUMP 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. ■ With your Chronotherm III Thermostat, you will notice that your compressor operates continuously during the recovery period.
ANSWERING COMMON QUESTIONS ABOUT THE CHRONOTHERM III THERMOSTAT 1. The temperature displayed on the Chronotherm III Thermostat doesn’t always match the room temperature on another thermometer located right next to it. Why? The Chronotherm III Thermostat is a very accurate instrument designed to sense both air temperature and wall temperature, like your body does. It gives an average reading over a period of time. Because it adjusts itself, it will take a few days after installation to adjust to your home.
ANSWERING COMMON QUESTIONS ABOUT THE CHRONOTHERM III THERMOSTAT 9. Can I stop the thermostat from bringing the heat on so early in the morning? How? T8631A has screws on the back of the thermostat that will allow you to turn off Adaptive Intelligent Recovery™. On the T8631R without the screw to override Adaptive Intelligent Recovery™, you will only be able to set one completely automatic energy savings period; the second period must be ended manually.
SAVING ENERGY ACROSS THE U.S. ■ Save up to 30% in energy costs. Chronotherm III Thermostats offer you complete comfort and a lowcost easy way to save on your energy bills. ■ If the time period you choose for setback is longer, you may see even greater energy savings. The energy saving period must be at least two hours long to save any energy. ■ The energy-saving percentages listed on the maps on pages 38 and 39 are based on setting the thermostat down in winter or up in summer for eight hours.
SAVING ENERGY ACROSS THE U.S. PERCENTAGE OF COOLING ENERGY YOU CAN SAVE o ONE 5 F ENERGY SAVINGS PERIOD* o 75 TO 80o F; 8 HRS/DAY 7% TO 9% 10% TO 11% 12% TO 14% DODGE CITY, KS CHICAGO, IL NEW YORK, NY 9% - 15% 13% - 20% 13% - 20% BILLINGS, MT MPLS.
PROGRAMMING YOUR THERMO GLOSSARY Program The times and temperatures you set to define the comfort and energy savings periods for each schedule (weekdays, Saturday, Sunday). Saturday program schedule The schedule of WAKE, LEAVE, RETURN and SLEEP period start times and temperatures that you program to run on Saturdays. Setback Reducing the temperature in the house for a set period every day in winter for energy savings. The lower temperature is the energy savings temperature.
YOUR THERMOSTAT YOUR PERSONAL PROGRAM You can use the tables below to plan your schedule before you begin programming. If you choose not to PERIOD WAKE LEAVE RETURN SLEEP PERIOD WAKE LEAVE RETURN SLEEP START TIME START TIME program a daytime energy savings period, leave the LEAVE and RETURN periods blank.
TROUBLESHOOTING GUIDE IF… Display will not come on. Display flashes during programming. Display flashes during operation. Program is lost due to power outage. Colon in display does not flash. Temperature change occurs at the wrong times. THEN… ■ Check that heat or cool system power is on. You need 24V from R to C terminals. ■ Make sure thermostat is correctly mounted on subbase. ■ You have reached the temperature setting limit. The setting range is 45° F to 88° F.
QUICK REFERENCE TO THE KEYS Press these keys to: SET PRESENT DAY/TIME DAY WAKE LEAVE SLEEP RETURN SET HEAT/COOL AHEAD Begin the current day or time programming. Set the day of the week and select the program day during programming. Select the time period to program or review. Switch between heat and cool settings during programming or when reviewing the program. Set the time ahead and back. Hold either key down to change the setting faster.
INDEX Accessing external system control .............................. 20 Adaptive Intelligent Recovery .......................... 25-28,40 Auxiliary heat light ....................................................... 41 Batteries, replacement ................................................ 23 Blinking display ........................................................ 3,10 Canceling programs .................................................... 17 Change temperature ............................................
LIMITED ONE-YEAR 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.
Residential and Building Controls Division Honeywell Inc. 1985 Douglas Drive North Golden Valley, Minnesota 55422 Residential and Building Controls Division Honeywell Limited—Honeywell Limitée 740 Ellesmere Road Scarborough, Ontario M1P 2V9 Helping You Control Your World 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.
