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CT2800 Programmable Thermostat
INSTALLATION AND PROGRAMMING INSTRUCTIONS
Welcome to the world of comfort and energy savings with your
new Honeywell Programmable Thermostat. Your new thermostat
will automatically control the temperature in your home, keeping
you comfortable while saving energy.
Weekday/Weekend (5-day/2-day)
Programmable Heat and/or Cool
Low Voltage (20 to 30 Vac)
Thermostat and Mounting Plate
Model CT2800
Table of Contents
Installation ........................................
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MERCURY NOTICE If you are removing an old thermostat that contains mercury in a sealed tube (Fig. 1), do not place the old thermostat in the trash. Contact your local waste management authority for instructions regarding recycling and the proper MERCURY SWITCH disposal of the old thermostat. Installation M3701 INSTALLATION Fig. 1. Verify You Have Correct Thermostat Make sure that the CT2800 is the correct thermostat for your heating/cooling system. Read the compatibility chart below to det
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Compatible Heating/Cooling System with CT2800? Alternate Model Steam No CT3600 A steam boiler with radiator heat. Heat Pump No CT3600 Heating and cooling are produced from the same outdoor unit (compressor) with no auxiliary or backup heat. Multistage Heat Pump No CT3611 Heating and cooling are produced from the same outdoor unit (compressor) with auxiliary or backup heat. Multistage Conventional No See your A heating or cooling system with more than one stage. contractor Step 1. Prepare fo
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Step 2. Remove Old Thermostat Fig. 2. a. Turn off power to the heating/cooling system, either at the furnace or at the fuse/circuit breaker panel. b. Remove the cover of your old thermostat (Fig. 2). c. Unscrew and remove the old thermostat’s mounting plate from the wall, but do not disconnect the wires. d. Inspect old thermostat wiring. If wiring meets any of the following conditions, see special wiring instructions section after Step 7. M20140 Fig. 3. • The old thermostat is a clock therm
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Rc G R W Step 3. Install Mounting Plate Fig. 5. a. Separate the mounting plate from the thermostat using a coin, as shown in Fig 5. b. Position the mounting plate on the wall. Be sure the mounting plate is flush against the wall and none of the wires are trapped behind it. c. Level the mounting plate and use a pencil to mark the center of the mounting plate screw holes. d. Remove the mounting plate and drill holes at the locations marked. • For drywall, drill two 3/16-inch holes. • For plaste
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Step 4. Set Thermostat for Your Type of Heating System IMPORTANT: Setting your thermostat cor- rectly for your type of heating THERMOSTAT BACK system allows it to maintain accurate temperature control, ON 1 1 DISPLAY F 3 - ON minimize swings in the tem- 2 2 DISPLAY C 3 - OFF 3 HEATING perature of the room, and 3 DIP SWITCH FUEL SWITCH SYSTEM POSITION POSITION efficiently run the fan. OFF ON WARM AIR 1 - ON 2 - ON F FURNACE HOT WATER OR 1 - OFF 2 - ON F HIGH EFFICIENCY a. Use the FUEL S
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R W Heating System Table DIP Switches Type of System 1 and 2 Fuel Switch Warm air, gas, or oil heating system with an efficiency rating under 90%. Use factory setting F (The furnace efficiency rating should be on the furnace.) 1–On; 2–On High-efficiency furnace such as a 90% or greater AFUE (Average Fuel 1–Off; 2–On F Utilization Efficiency) unit Hot water boiler 1–Off; 2–On F Electric furnace 1–On; 2–Off E Step 5. Wire Thermostat Terminals Fig. 9. a. Hold thermostat as shown in Fig.
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Step 6. Mount Thermostat Fig. 11. Fig. 12. e. Align the tabs at the top of the thermostat with the tabs at the top of the mounting plate (Fig. 11). f. Press the lower edge of the case to latch the bottom of the thermostat (Fig. 12) M20131 M20130 69-1638—1 8
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Step 7. Install the batteries Fig. 13. IMPORTANT: Batteries must be installed for programming and operation of the thermostat and heating/cooling system. Honeywell recom- mends using Energizer® batteries. a. Make sure that the System switch is set in the OFF position. b. Using a coin, open the battery door as shown in Fig. 13. c. Install the batteries. Make sure that the positive and negative termi- nals are oriented correctly as marked inside the battery case. d. Replace the battery door. REM
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Six or more wires If your old thermostat has six or more wires (excluding clock wires attached to the C or C1 terminals), your heating/ cooling system is most likely a variation of a heat pump or multistage system. Your CT2800 Thermostat will NOT work with such systems and should be returned to the place of purchase. See the thermostat compatibility table for information about which programmable thermostat will work with your system. Three thermostat wires If you have three wires for heating o
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Old thermostat terminals that do not match new thermostat terminals Use the table below to wire the new thermostat. Connect to New Old Thermostat Thermostat Terminal Terminal Description R, RH, 4, V R* Power Rc, R Rc* Power for cooling W, W , H W Heat 1 Y, Y , M Y Cooling 1 G, F G Fan O Do not continue Changeover in cool (O terminal) or changeover in heat (B terminal). installation You have a single-stage heat pump or zoning system. Select an alternate B thermostat model. C, X, B Do not conn
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PROGRAMMING Faceplate Illustration and Description Descriptions Fig. 16. 1 Fan switch–Selects automatic fan operation or fan on. 2 Set Schedule–Puts the thermostat into programming mode. 7 8 3 Set Clock/Day–Sets the clock and day. 4 Time Ahead and Back–Sets the time ahead and back. 6 9 AM SET PM SYSTEM ON 5 Program periods–Current program period 5 10 MO TU WE TH FR SA SU TEMPORARY WAKE LEAVE RETURN SLEEP or period being programmed. 4 11 6 Day of the week–Current day or day being Se
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Step 1. Set Current Time and Day Fig. 17. Clock/Day a.Press once. The time is displayed (Fig. 17). b. Press Time until the current time is displayed. Fig. 18. Clock/Day c.Press again. The day is displayed (Fig. 18). d. Press Time until the current day is displayed. Fig. 19. Run Program e.Press once. The current time and day and the current temperature are displayed (Fig. 19). Step 2. Learn About Programming Features Your CT2800 Thermostat allows you to program schedules for both a heati
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Program Period Description When Available The time when you get up and get ready to leave your home. You can Weekdays and weekend WAKE set the system at a comfortable temperature for this period. The time when you are regularly away from home. You can set up an Weekdays only LEAVE energy-saving temperature for this period. The time between returning home and going to bed. You can set the Weekdays only RETURN system at a comfortable temperature for this period. The time when you are sleeping. Y
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Step 3. Program Heating Schedule a. Write in the times and temperatures that you want to program for your heating schedule. Program Heating Schedule Period WAKE LEAVE RETURN SLEEP Suggested Time 6:00 AM 8:00 AM 6:00 PM 10:00 PM Settings Temp 70°F (21°C) 62°F (16.5°C) 70°F (21°C) 62°F (16.5°C) Weekday (Mon–Fri) Time Temp Weekend (Sat–Sun) Time Temp b. Set the System switch to HEAT. Fig. 20. Schedule c.Press once. A blank schedule is displayed (Fig. 20). d. Set the Monday–Friday WAKE time by pr
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Fig. 22. Schedule f. Press to display a blank schedule for the next pro- gram period (Fig. 22) and repeat steps d. through f. for each weekday program period. Fig. 23. Schedule g. Press until the weekend schedule is displayed (Fig. 23). h. Set the Saturday and Sunday WAKE time by pressing Time until the desired time is displayed. i. Set the Saturday and Sunday WAKE temperature by Fig. 24. pressing Temp until desired temperature displays (Fig. 24). Schedule j. Press again to d
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Step 4. Program Cooling Schedule a. Write in the times and temperatures you want to program for your cooling schedule. Program Cooling Schedule Period WAKE LEAVE RETURN SLEEP Suggested Time 6:00 AM 8:00 AM 6:00 PM 10:00 PM Settings Temp 78°F (25.5°C) 85°F (29.5°C) 78°F (25.5°C) 82°F (28°C) Weekday (Mon–Fri) Time Temp Weekend (Sat–Sun) Time Temp b. Set the System switch to COOL. c. Repeat steps 3c. through 3k. to program the weekday and weekend cooling schedule. Step 5. Check System Verify that
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d. Set the System switch to Cool, and the Fan switch to Auto. Fig. 26. e. Press Temp until the setting is 10°F (6°C) below room temperature (Fig. 26). Your cooling system and fan should start. NOTE: When cooling setting is changed, thermostat can delay up to five minutes before turning on air conditioner. This delay protects the compres- sor. f. Press Temp until setting is 10°F (6°C) above room temperature.Your cooling system and fan should stop. g. Set the System switch to Off and the F
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Set Fan and System Switches The switches on the bottom of the thermostat faceplate control the operation of your fan and the heating and cooling system. Set the Fan switch first and then set the System switch. Switch Setting Result Fan Auto A single-speed fan turns on automatically with the air conditioner or furnace. A two-speed fan usually runs on high with the air conditioner and on low with the furnace. Auto is the normal setting for most homes. On The fan runs continuously. Use this setti
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d. Install new batteries. Make sure that positive and negative terminals are oriented as marked inside battery case. e. Close the battery door and set the System switch to HEAT or COOL. NOTE: If “bAt Lo” continues to display after replacing the batteries, set System switch to OFF, insert batteries back- ward, wait for five to ten seconds, and return batteries to correct orientation. Then reprogram. IMPORTANT: Replace batteries once a year to prevent heating/cooling system from shutting down due
