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T8131A,B Programmable Thermostat
OWNER’S GUIDE
Weekday/Weekend (5-day/ 2-day)
Programmable Heat and/or Cool
Low Voltage (20 to 30 Vac)
Thermostat and Mounting Plate
1
69-0887—1 69-0887-1
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Welcome to the world of comfort and energy Direct any questions concerning the application savings with your new Honeywell program- of this thermostat to Honeywell Customer mable thermostat. Assistance at 1-800-468-1502, Monday-Friday 7:00 a.m.-5:30 p.m., Central time. By following the programing instructions in this manual, your new thermostat will automatically control the temperature in your home, keeping you comfortable while saving energy. 2 69-0887—1
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Table of Contents Page Prepare for Installation .................................................................................................................... 5 Remove Old Thermostat ................................................................................................................. 7 Replacing a Clock Thermostat that has C or C1 Clock Terminals .................................................. 8 Install Batteries...............................................................
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RECYCLING MERCURY If this thermostat is replacing a thermo- SWITCH stat that contains mercury in a sealed tube, do not place your old thermostat in the trash. See Fig. 1. Contact your local waste management authority for instructions regarding recycling and the M3701 proper disposal of your old thermostat. Fig. 1. Typical location of a mercury switch If you have questions, call Honeywell in a thermostat. Inc. at 1-800-468-1502. 4 69-0887—1
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Prepare for Installation A Check Table 1 to make sure this thermostat is compatible with your system. For more information, call Honeywell Customer Assistance, toll-free 1-800-468-1502. Table 1. Compatibility Chart. System Type Compatible With T8131 Gas—Standing Pilot Yes Gas—Electronic Ignition Yes a,b Gas-Fired Boilers Yes Gas—Millivolt No a,b Oil-Fired Boilers Yes Oil-Fired Furnace Yes Electric Furnace Yes Electric Air Conditioning Yes Baseboard Electric (120/240 Line Volt) No Heat Pumps/Mult
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2 Acquire tools and items (below) as needed. Also purchase two AA alkaline batteries; we recommend Energizer® batteries. CROSS-RECESSED SCREWDRIVER HAND OR POWER DRILL WITH 3/16 INCH DRILL BIT, IF NEEDED TO DRILL HOLES IN WALL MASKING TAPE, IF WIRE CUTTER/STRIPPER OR SHARP NEEDED TO LABEL WIRES KNIFE, IF NEEDED TO STRIP WIRES AS DISCONNECTED FROM OLD THERMOSTAT LEVEL, IF NEEDED TO LEVEL M878B THERMOSTAT FOR APPEARANCE 6 69-0887—1
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5 Loosen screws holding thermostat to Remove Old Thermostat subbase, wallplate or wall, and lift away. 6 Disconnect wires from old thermostat or A Test to make certain that your heating subbase. As you disconnect each wire, and cooling systems are working use masking tape to label it with the old properly. If either does not work, contact terminal designation. If there are only two your local heating/air conditioning dealer. wires, they do not require labeling. If To avoid compressor damage, do
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have a variation of a heat pump or multistage Replacing a Clock Thermostat that system. This thermostat is not compatible with has C or C1 Clock Terminals? such systems. If you would like information about which programmable thermostats will If you are replacing a Honeywell Chronotherm® work with your system, call Honeywell Customer Thermostat, you may find one or two wires that Assistance at 1-800-468-1502. go to the C or C1 clock terminals on the Chronotherm® Thermostat wiring wallplate. Do Th
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Install Batteries IMPORTANT Batteries must be installed for pro- gramming and operating the thermo- stat and heating/cooling system. REMOVING BATTERY DOOR A Use two AA alkaline batteries; non- alkaline batteries will not last as long, and can leak, causing damage to the thermostat or the wall surface. We M1719C recommend Energizer® batteries. 2 Make sure the thermostat is set to the OFF position. As the batteries are running low, a bAt Lo 3 Use a coin to remove the battery door. indicator flashe
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indicator eventually stops flashing. bAt Lo stays IMPORTANT on without flashing to indicate the thermostat and Although the thermostat has a low heating/cooling system have stopped working battery indicator, replace the batteries and the batteries are almost completely dead. once a year to prevent the thermostat and heating/cooling system from After the batteries are completely dead, the bAt shutting down due to lack of battery Lo indicator disappears, leaving a completely power. blank display.
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time periods are available. These periods can Program the Thermostat be seen individually on the display as you press the Set Schedule key. When batteries are installed, your thermostat can be programmed in your hand, before it is WAKE is the time period you want the house at mounted on the wall. a comfortable temperature when you get up and while you get ready for work or school. If you would prefer to program the thermostat When deciding what time to set for your WAKE after it is mounted on th
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at work or school. (This will be a lower tem- sleeping. (Again, lower for heating or higher for perature during heating season, or a higher cooling. For more comfortable sleeping, some temperature during cooling season.) homeowners choose not to raise the cool temperature during the night.) RETURN is the time period you want the house at a comfortable temperature for You will set one schedule for weekdays and activities before bedtime. When deciding what another for weekends, because your requir
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it. For example, a house that is occupied NOTE: Using sharp fingernails or pencil during weekdays would only require programs points can damage the keypad. for WAKE and SLEEP. If you make an error at any time during programming, press the Run Program key and Before programming, remove the clear plastic continue again at the last step. overlay covering the display. When pressing the keys, use the ball of your finger or a soft pencil eraser. 13 69-0887—1
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Program Schedule HEATING PROGRAM SCHEDULE 2 Weekdays Start Time Heating Temperature 1 WAKE LEAVE 1 RETURN SLEEP Weekends WAKE 1 SLEEP 1 WAKE and RETURN start times should include extra lead time, based on outside temperature and furnace response time, to give your furnace a head start to heat the house. 2 The temperatures cannot be set any higher than 88°F (31°C) or any lower than 45°F (7°C). 14 69-0887—1
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COOLING PROGRAM SCHEDULE Weekdays Start Time Cooling Temperature 2 1 WAKE LEAVE 1 RETURN SLEEP Weekends 1 WAKE SLEEP 1 WAKE and RETURN start times should include extra lead time, based on outside temperature and furnace response time, to give your furnace a head start to heat the house. 2 The temperatures cannot be set any higher than 88°F (31°C) or any lower than 45°F (7°C). NOTE: If you decide not to program the thermostat, it automatically controls heating at 68°F (20°C), and cooling at 78°F
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This guide can be used for programming your new thermostat. NOTE: Batteries are required for operation and programming. When inserting batteries, set the system switch to OFF. Remove the battery door (on the thermostat left side) using a coin at the bottom. Follow the instructions on pages 9 and 10. Time Set Current Time/Day Ahead Set To set the time, press and release once, until current time shows; to set day, press Clock/Day Back Time Ahead Run Set and release
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Time Temp Ahead Warmer Use to program WAKE time and to program WAKE temperature for Mon-Fri. Back Cooler Time Repeat sequence for LEAVE, RETURN, and SLEEP. Ahead Set Press until SAT, SUN, WAKE and SET appear on the display. Use to program Schedule Back Temp Warmer WAKE time and to program WAKE temperature for SAT-SUN. Repeat sequence for SLEEP. Cooler Cooling Program With system switch at COOL, follow the same instructions as for t
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A quick guide for operating or making changes follows: NOTE: Set system switch to Heat or Cool to perform the following: Temp Warmer Temporarily Change temperature for current period only—press ; TEMPORARY Cooler indicator shows on display; this is cancelled at next scheduled change, or to cancel sooner, Run Temp press . Program Warmer Hold Hold a temperature indefinitely (such as when you are on vacation)—press , ; Temp Cooler Run HOLD appears on
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Set Run Check Programs—press repeatedly to see each time and temperature; then press . Schedule Program Time Ahead Set Cancel a program—press until program to cancel shows; then press together. Schedule Back Permanently Change a program—Repeat steps in Heating Program or Cooling Program (page 16 and 17), as applicable. Run Return to normal program or start program—press . Program Questions? Call Honeywell Customer Assistance 1-800-468
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setting screws A and B on the back of Adjust Fan Operation Switch the thermostat. Use the heating system table shown in the illustration (page 21) A The thermostat fan operation switch, as a guide. labeled FUEL SWITCH (see illustration on page 21), is factory-set in the F position. Optimize the system on-time according to the This is the correct setting for most type of system to minimize room temperature systems. If your system is an electric heat swings. Setting the screw out one turn means sy
