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Honeywell/20
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
Model CT2095
Place Bar Code Here
69- 1385
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Welcome to the world of comfort and energy savings with your new Honeywell MERCURY NOTICE Programmable Thermostat. If this thermostat is replacing a thermo- Your new thermostat will automatically control stat that contains mercury in a sealed the temperature in your home, keeping you tube, do not place your old thermostat in comfortable while saving energy when the trash. Dispose of properly. programmed according to the instructions in this manual. Contact your local waste management autho
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Contents Step 1. Prepare for Installation ..................................................................................................... 4 Step 2. Remove Old Thermostat ..................................................................................................6 Step 3. Install Batteries ................................................................................................................ 8 Step 4. Program Thermostat ........................................................
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❑ Step 1. Prepare for Installation Check Table 1 to make sure this thermostat is compatible with your system. If not, return it to the retailer. For more information, call Honeywell Consumer Services, 1-800-468-1502, Monday - Friday, 7 am to 5:30 pm, Central time. Table 1. Compatibility Information. System Type Compatible with CT2095 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
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❑ Acquire tools and items as needed (see illustration). 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 WIRE CUTTER/STRIPPER OR SHARP KNIFE, IF NEEDED TO STRIP WIRES LEVEL, IF NEEDED TO LEVEL M13544 THERMOSTAT FOR APPEARANCE 5 69-1385
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❑ ❑ ❑ ❑ ❑ ❑ Loosen screws holding thermostat to Step 2. Remove Old Thermostat subbase, wallplate or wall, and lift away. Test to be sure your heating and cooling Disconnect wires from old thermostat or systems are working properly. If either does subbase. As you disconnect each wire, not work, contact your local heating/air attach one of the enclosed labels to each old conditioning dealer. To avoid compressor terminal designation. If there are only two damage, do not operate the cooling
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those systems so return the product to the Replacing a Clock Thermostat that has retailer. If you want information about the C or C1 Clock Terminals? programmable thermostats that work with your If you are replacing a Honeywell Chronotherm® system, call Honeywell Consumer Services at Thermostat, you may find one or two wires that 1-800-468-1502. go to the C or C1 clock terminals on the Chronotherm® Thermostat wiring wallplate. Do Three thermostat wires? not allow them to touch, or you c
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❑ ❑ ❑ ❑ Step 3. Install Batteries IMPORTANT Batteries must be installed for the pro- gramming and operation of the ther- mostat and heating/cooling system. Purchase two AA alkaline batteries; non- alkaline batteries do not last as long, and can leak, causing damage to the thermostat or the wall surface. We recommend Energizer® batteries. Open the top cover of thermostat to access control panel and battery compartment. Make sure the thermostat is set to the Off BATTERY DOOR COVER position. U
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❑ ❑ Install the fresh batteries as shown, making After the batteries are completely dead, the sure positive and negative terminals are bAtLo indication disappears, leaving a oriented correctly. completely blank display. Replace the battery cover. INSTALL TWO AA ALKALINE As the batteries run low, a bAt Lo indicator BATTERIES AS SHOWN flashes for one to two months before the batteries run out completely. Replace the batteries as soon as possible after the indicator starts flashing. If you d
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Press down on the left ends of batteries to IMPORTANT remove them. If you insert the new batteries Although the thermostat has a low bat- within 20 to 30 seconds of removing the old tery indicator, replace the batteries ones, you do not need to reprogram the once a year to prevent the thermostat thermostat. However, if the display is blank, the and heating/cooling system from shut- batteries are dead or incorrectly installed and ting down due to lack of battery power. you must reprogram. See S
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WAKE is the time period you want the house Step 4. Program Thermostat at a comfortable temperature when you get After the batteries are installed, the thermostat up and while you get ready for work or can be easily programmed in your hand before school. (This is a higher temperature during it is installed on the wall. heating season and a lower temperature dur- ing cooling season.) If you prefer to program the thermostat after it is LEAVE is the time period you can set for an ins
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Set one schedule for weekdays and another for If no program is entered for the weekends, the weekends because your requirements are thermostat operates on the weekday SLEEP usually different for each. Also, during week- program all weekend. ends, only the WAKE and SLEEP time periods are available. Before programming, remove the clear plastic overlay covering the display. Fill in the times and temperatures you desire for weekdays and weekends. If you decide not to When pressing the keys, use
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Table 2. Personal Programming Chart for Heating. a Days of Week Heating Program Start Time Heating Temperature Weekdays WAKE LEAVE RETURN SLEEP b Weekends WAKE SLEEP a The temperatures cannot be set any higher than 88°F (31°C) or any lower than 45°F (7°C). b If you decide not to enter weekend programs, the thermostat operates on the weekday SLEEP pro- gram all weekend. 13 69-1385
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. Table 3. Personal Programming Chart for Cooling. a Days of Week Cooling Program Start Time Cooling Temperature Weekdays WAKE LEAVE RETURN SLEEP b Weekends WAKE SLEEP a The temperatures cannot be set any higher than 88°F (31°C) or any lower than 45°F (7°C). b If you decide not to enter weekend programs, the thermostat operates on the weekday SLEEP pro- gram all weekend. 14 69-1385
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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 instructions in Step 3. Also see the label inside the battery cover for abbreviated programming procedures for your thermostat. Time Set Current Time/Day Clock/Day To set time, press and release once, press until current shows. To set day, press and Time Clock/Day Run Program release a
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Time Weekend Press until SAT SUN (Saturday-Sunday), WAKE and SET appear on display. Use to program TEMP WAKE time and to program WAKE temperature for SAT SUN (Saturday-Sunday). Run Program Repeat sequence for SLEEP. Press and release to start the program. Cooling Program With System switch at Cool, follow the same instructions as for the Heating Program. Run Program After programming, adjust the Fan and System switches, as desired. Press and release to start the program. 16 69-1385
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Operating Your Thermostat System switch must be set to Heat or Cool to perform the following: TEMP Temporarily Change Temperature for current period only — Press ; temporary indicator shows Run Program on display and cancels itself at the next scheduled change; to cancel sooner, press . TEMP Hold Temp Hold a Temperature Indefinitely (such as when on vacation) — Press and ; HOLD Run Program appears on display; to cancel, press . Present Set Check Current Temperature Setting — Press . Wee
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Clear Weekday Weekend Cancel Program — Press , until program to cancel shows; then press . Usage Check Usage — Press to see length of time heat or air conditioning has run today since Clear midnight; press again for yesterday’s usage, press again for cumulative; press to clear Run Program cumulative reading, if desired; then press . Permanently Change a Program — Repeat Heating Program or Cooling Program steps, as applicable. Run Program Return to Normal Program or Start Program — Press
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❑ ❑ as a guide. The system on-time should be Step 5. Adjust Fan Operation optimized according to the type of system to Switch, As Required maximize comfort. Setting the screw “out one turn” means turning the screw approximately The thermostat fan operation switch, labeled 360° counterclockwise, or about one com- FUEL SWITCH (see illustration) is factory-set plete turn. in the F position. This is the correct setting for most systems. If your system is an electric THERMOSTAT BACK heat sys
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❑ In the unlikely event that you want a longer IMPORTANT furnace on-time, readjust screws A and/or B as When using a high efficiency furnace follows: such as a 90 percent or greater Aver- age Fuel Utilization Efficiency (AFUE) First, turn both screws in completely, then unit, adjust screw A out one turn and adjust for system type: leave screw B in. Warm Air Furnace—Set at the Hot Water setting (A—out one turn, B—leave in). The thermostat is set to read the temperature Electric Furnace—L
