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Honeywell CT3650
PROGRAMMABLE THERMOSTAT
OWNER’S GUIDE
Seven Day
Programmable Heat and/or Cool
Low Voltage (20 to 30 Vac) Thermostat and Wallplate
Model CT3650
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Table of Contents
Step 1. Prepare for Installation ................................................................................................................................... 5
Step 2. Remove Old
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Total comfort temperature management with Smart Response™ Technology. Congratulations! You made a smart choice by purchasing your new Honeywell thermostat; 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 or return home. Saves the maximum amount of energy and money by automatically remembering to adjust the temperature when you
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TIME /TIME DIGITAL DISPLAY SETS TIME RAISES FORWARD OR BACK TEMPERATURE SETTING SET CURRENT DAY/TIME LOWERS SETS CURRENT TEMPERATURE SETTING TIME AND DAY DISPLAYS CURRENT HEAT/COOL RUN PROGRAM TEMPERATURE SETTING RETURNS THERMOSTAT TO NORMAL Time Set Program PROGRAM PERIODS OPERATING MODE Run Set Current Wake Leave Return Sleep WAKE/LEAVE/RETURN/SLEEP: Program Day/Time ENTERS PROGRAMMING MODE HOLD TEMP Heat/Cool Hold Temp Day Settings SETS A HOLD TEMPERATURE HEAT/COOL SETTING D
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DISPLAYS EITHER CURRENT SHOWS THERMOSTAT IS IN TIME OF DAY OR PROGRAM TIMES THE SET DAY/TIME MODE SHOWS WHEN THERMOSTAT IS IN THE SHOWS TEMPERATURE SETTING PROGRAMMING MODE CHANGED FOR THIS PROGRAM PERIOD SHOWS VACATION SHOWS THE TEMPERATURE HOLD DURATION DISPLAYED IS THE CURRENT Set Program Set Day/Time Temporary Setting SET TEMPERATURE Hold for SHOWS CURRENT AM DAY OR DAYS BEING Em Ht Room SHOWS THE TEMPERATURE PROGRAMMED DISPLAYED IS THE CURRENT Humid Aux Ht ROOM TEMPERATURE MonTueWe
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STEP 1. PREPARE FOR INSTALLATION ❑ Check Table 1, the compatibility chart, to make sure the thermostat is compatible with your system. If your system is not compatible, call Honeywell Customer Relations Center, toll-free, 1-800-468-1502. Table 1. Compatibility Chart. System Type Compatibility with CT3650 Gas — Standing Pilot Yes Gas — Electronic Ignition Yes a Gas-fired Boilers Yes Gas — 750 Millivolt Heat Yes a Oil-Fired Boilers Yes Oil-Fired Furnace Yes Electric Furnace Yes Electric Air Cond
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STEP 2. REMOVE OLD THERMOSTAT ❑ Test your heating and cooling systems to make sure they work properly. If either system does not work, contact your local heating/air-conditioning dealer. To avoid compressor damage, do not operate the cooling system when outdoor temperature is below 50°F (10°C). ❑ Turn off power to the system at the furnace or the fuse/circuit breaker panel. ❑ Carefully unpack your new thermostat and wallplate. Save package of screws, instructions, and receipt. ❑ Remove the cov
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STEP 3. MOUNT THERMOSTAT WALLPLATE ❑ Separate the wallplate from the thermostat by placing your thumb or fingers between the bottom of the wallplate and the thermostat, and pulling the wallplate up and away from the thermostat. See illustration at right. ❑ Position the wallplate on the wall. Level the wallplate for appearance if desired. Use a pencil to mark the two mounting holes that best fit the application. ❑ Remove the wallplate from the wall. Drill two 3/16 in. holes in wall (if drywall
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G Y W R STEP 4. WIRE WALLPLATE TERMINALS IMPORTANT All wiring must comply with local codes and ordinances. If unsure about household wiring procedures, call your local heat- ing/air-conditioning contractor. Refer to the labels you placed on the wires when you removed the old thermostat (see illustration). ❑ Match the letter of your old thermostat wire with the corresponding terminal letter on your new thermostat. Refer to Table 2. ❑ Remove the factory-installed jumper connecting terminals R a
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Table 2. Terminal Designations on Old and New Thermostats. Terminal on Old Thermostat Connect To Description a R Power R, RH , 4, V a Rc Power for cooling Rc, R W, W , H W Heat 1 Y, Y , M Y Cooling 1 G, F G Fan O O Changeover in cool. (Single stage heat pump only). b b Changeover in heat. (Single stage heat pump only). B B c c b Do not connect. Transformer common C , X , B W , H Do not continue installation. Second stage heat. 2 2 Call 1-800-468-1502. Y Second stage cool. 2 a If both RH and R te
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90 60 80 70 When the batteries are running low, a REPL BAT message flashes for one to two months before the batteries run out completely. Replace the batteries as soon as possible once the message flashes. IMPORTANT Although the thermostat has a low battery indicator, replace the batteries once per year to prevent leakage and to prevent the ther- mostat and heating/cooling system from shutting down due to lack of battery power in the thermostat. If you insert new batteries within 20 to 30 se
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STEP 7. CUSTOMIZE YOUR THERMOSTAT Your Honeywell CT3650 thermostat comes preset to the most commonly used settings. The settings are: Gas or oil forced air furnace. Smart Response technology on. Temperature °F. 12-hour clock format. You can change any or all of these settings. IMPORTANT Always press the keys with your fingertip or a similar blunt tool. Sharp instruments like pens and pencil points can damage the keyboard. ❑ Press and hold down , , and , simultaneously until the screen shows. Yo
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Run Program ❑ Press Time to move to next feature or to return to main display. Smart Response™ Technology (Feature Number 13) Smart Response technology options are: 0 = Smart Response technology on (preset). 1 = Smart Response technology off. M13343 To turn Smart Response technology on or off: ❑ Press once. Run Program ❑ Press Time to move to next feature or to return to main display. NOTE: See Smart Response technology (page 20) for information about this feature. Temperature Format (Featu
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Factory Set Function (Feature Number 37) Do not change this setting. M13346 STEP 8. SET THE CLOCK Set Current Day and Time NOTE: On initial power-up, the screen flashes 1:00 pm until you press a key. Set Current ❑Press . Day/Time Day ❑ Press until screen shows current day. Set Current ❑ Press Time or until screen shows current time. (Tapping the Day/Time will advance the time in one hour increments). Daylight ❑Press Timeuntil “DST” displays if daylight savings time is in effect. Run Progra
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Return —The program period when you want the house at a comfortable temperature for activities before bedtime. (This is a higher temperature during the heating season and a lower temperature during the cooling season). Sleep —The program period you can set for an energy-saving temperature while you sleeping. (This is a lower temperature during the heating season and a higher temperature during the cooling season). Table 3 can be helpful when planning your schedule of time and temperature sett
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Program the First Day Start by programming the wake time and temperature for one day. Wake ❑ Press and release . Day ❑ Press until the desired day displays. (Mon, Tue, Wed, Thu, Fri, Sat, Sun) ❑ Press time or until the desired time shows in the display. NOTE: Program times are in 15 minute intervals. For example, 8:00, 8:15, 8:30. ❑ Press or until the desired wake temperature displays. The setpoint temperature range is 40°F to 90°F (4.5°C to 32°C) for heating and 45°F to 99°F (7°C to 37°C)
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Copy a Day Your thermostat can copy program settings from one day to another. Wake Leave Return Sleep ❑ Press , , or to enter programming mode. Day ❑ Press until the display shows the day you want to copy. Copy ❑ Press . The display shows. Mon M13327 Day ❑ Press until the display shows the day you want to copy to. Mon Wed M13328 Copy ❑ Press to accept the change. ❑ Repeat these steps for each day you want to copy. M13329 NOTE: donE appears for two seconds and then the normal program display
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STEP 10. OPERATING YOUR THERMOSTAT Change Temperature Setting Until the Next Program Period (Temporary Change) ❑ Press or until the screen shows the desired temperature setting. NOTE: The temporary temperature setting is displayed for about 3 seconds and then the room temperature is dis- played. Temporary appears in the display. The setting cancels when the next program period starts or when Run Program you press . Change Temperature Setting Indefinitely (Hold) System ❑ Press until “Heat” or
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Daylight Time ❑Press during the spring to set time forward one hour. DST is displayed when operating on daylight savings time. NOTE: Pressing the Daylight Time key more than once in a five minute period scrolls you through various time option. For example, one hour earlier or later, with or without DST. Pressing Daylight Time six times in a five minute period returns you to your original setting. STEP 11. SET THE FAN AND SYSTEM KEY Set the Fan Key ❑ Fan On: The fan runs continuously. Use fo
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IF YOU HAVE A PROBLEM Table 4. Solution Guide. If... Then… Display does not appear. Make sure the batteries are installed correctly. Make sure the thermostat is mounted and latched on the wall plate. Mount and latch the thermostat on the wallplate if it is not. Temperature settings will not change Make sure the temperature setpoints are: (example; cannot set the heating higher 40 to 90°F (4.5 to 32°C) for heating. or the cooling lower). 45 to 99°F (7 to 37°C) for cooling. Heating does not
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Toll-Free Customer Assistance Please read and follow the provided instructions for this thermostat. For additional information, go to www.honeywell.com/yourhome or call the Honeywell Customer Relations Center at 1-800-468-1502. The Center hours are Monday through Friday, 7:00AM to 5:30PM Central Time. Before calling, please have the following information available: Thermostat model number. (Located on back of thermostat). Thermostat date code. (Located below model number). Type of heati
