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Honeywell CT8602
PROGRAMMABLE THERMOSTAT
OWNERS GUIDE
Seven Day
Programmable Heat and/or Cool
Low Voltage (20 to 30 Vac) Thermostat and Wallplate
Model CT8602
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Table of Contents
Step 1. Prepare for Installation ............................................
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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 l
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INCREASE TEMPERATURE SET RETURN TIMES SET WAKE TIMES SET LEAVE TIMES INCREASE TIME SETTING SETTING OR SCROLL AND SETPOINTS AND SETPOINTS AND SETPOINTS OR SCROLL FORWARD FORWARD THROUGH THROUGH INSTALLER SETUP INSTALLER SETUP OPTIONS AND SYSTEM TEST DECREASE TEMPERATURE SET CURRENT SETTING OR SCROLL DAY AND TIME BACKWARD THROUGH INSTALLER SETUP OPTIONS RETURN TO DISPLAY INFORMATION SUCH AS PRESENT NORMAL SETTINGS AND OUTDOOR OPERATIONS TEMPERATURE ENTER INDEFINITE Time Set Program S
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SHOWS WHEN THERMOSTAT IS IN THE PROGRAMMING MODE DISPLAYS EITHER CURRENT TIME OF DAY OR PROGRAM TIMES SHOWS THERMOSTAT IS PROCESSING INFORMATION SHOWS TEMPERATURE SETTING AND WAITING TO CALL FOR CHANGED FOR THIS PROGRAM PERIOD HEAT OR COOL SHOWS THE TEMPERATURE SHOWS SMART DISPLAYED IS THE CURRENT RESPONSE SET TEMPERATURE IS CHANGING THE TEMPERATURE SHOWS CURRENT TO MEET THE SYSTEM SWITCH CURRENT System Wait Set Program Set Day/Time Temporary Setting POSITION PROGRAMS Heat HEAT/OFF/
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STEP 1. PREPARE FOR INSTALLATION ❑ Check the contents of your thermostat package to be sure all items are included. Package Contents Thermostat Wallplate Owners Guide Wiring labels Screws and anchors ❑ Locate the required tools to install your thermostat. Tools Required Screwdriver Drill Drill bits: 3/16 in. for drywall; Hammer Needle-nose pliers 7/32 in. for plaster Level STEP 2. REMOVE OLD THERMOSTAT ❑ Test your heating and cooling systems to make sure they work properly
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Replacing a Clock Thermostat that has C or C1 Clock Terminals When replacing a Honeywell Chronotherm®Thermostat, you may find one or two wires going to the C or C1 clock terminals on the Chronotherm wiring wallplate. Do not allow them to touch, or you can damage the transformer. Disconnect the wires and wrap them separately using electrical tape. Do not wrap them together. Place the wires where they will not interfere with the operation of the new thermostat. Record the colors and terminal
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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 heating/air-conditioning contractor. Refer to the labels you placed on the wires when you removed the old thermostat (see illustration). ❑ Match the letter of old thermostat wire with the corresponding terminal letter on new thermostat. Refer to Table 1. ❑ Remove factory-installed jumper connecting terminals R and RC if wires
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Table 1. Terminal Designations on Old and New Thermostats. Terminal on Old Thermostat Connect To Description a RPower 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 ter
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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 3
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STEP 7. MOUNT THE THERMOSTAT A. ENGAGE TABS AT TOP B. PRESS LOWER OF THERMOSTAT EDGE OF CASE AND WALLPLATE. TO LATCH. M12703A STEP 8. CUSTOMIZE YOUR THERMOSTAT Your Honeywell CT8602 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 i
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System Type (Feature Number 4) System type options are: 1 = Gravity or steam system. 3 = Hot water, high efficiency furnace (90% or better), or single stage heat pump. 6 = Gas or oil forced air furnace (preset). FEATURE OPTION 9 = Electric furnace. NUMBER M18750 To change your system type: ❑ Press until display shows your furnace or boiler type. Run Program ❑ Press Time to move to next feature or to return to main display. Smart Response Technology (Feature Number 13) Smart Response
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Time Format (Feature Number 16) Time format options are: 0 = 12-hour clock (preset). 1 = 24-hour clock. M18753 To change time format: ❑ Press once. Run Program ❑ Press Time to move to next feature or to return to main display. Heating Temperature Range Stops (Feature Number 34) Temperature range options are: 90 = highest setting for heating setpoint (preset). 40 to 89 = temperature range (1°F increments) of heating setpoint settings. ❑ Press or until the display shows the desired h
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Furnace Air Filter Timer (Feature No. 43) Filter timer options: 0 = off 1 = 30 days 2 = 90 days (preset) M19600 3 = 180 days 4 = 365 days To change your filter timer: ❑ Press until the display shows the desired number of days. Run Program ❑ Press Time to move to next feature or to return to main display. NOTE: The filter time is based on calendar days. Humidifier Pad Timer (Feature No. 44) Humidifier pad timer options: 0 = off (preset) 1 = 90 days 2 = 180 days 3 = 365 days M20246 To change yo
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STEP 9. 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 Day/Time ❑Press . Day ❑ Press until screen shows current day. Set Current Day/Time ❑ Press Time or until current time shows. (Tapping advances time in one-hour increments.) Daylight Time ❑ Press until DST displays if daylight savings time is in effect. Run Program ❑Press . STEP 10. PROGRAMMING The keyboard is located behind the thermostat cover. The thre
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Table 2 shows the default temperature settings. Table 2. Default Temperature Settings. a b Period Time Heating Temperature Cooling Temperature Wake 6:00 AM 70°F/21°C 78°F/25.5°C Leave 8:00 AM 62°F/16.5°C 85°F/29.5°C Return 6:00 PM 70°F/21°C 78°F/25.5°C Sleep 10:00 PM 62°F/16.5°C 82°F/28°C a Your heating setpoints cannot be higher than 90°F (32°C) or lower than 40°F (4.5°C). b Your cooling setpoints cannot be higher than 99°F (37°C) or lower than 45°F (7°C). Program the First Day Start by pr
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❑ Press or until the display shows the desired temperature setpoint. Leave Return Sleep ❑ Press , or and repeat these steps for each program period. The First Day is now programmed. ❑ Repeat each step in Program the First Day for the rest of the week. NOTE: After the first day is programmed, you can copy that day to any other day using procedure in Copy a Day. Run Program ❑ Press when the entire week is programmed. Copy a Day Your thermostat can copy program settings from one day to anoth
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Clear a Program Period NOTE: Wake cannot be cleared. Leave Return Sleep ❑ Press , , or for the program period you want to clear. Day ❑ Press until the desired day displays. Leave Return Sleep ❑ Press and hold , , or for approximately three seconds until time and temperature clear. ❑ Repeat the above steps for each period to be cleared. Run Program ❑Press . STEP 11. OPERATING YOUR THERMOSTAT Change Temperature Setting Until the Next Program Period (Temporary Change) ❑ Press or until the scre
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Change the Temperature Setting Until a Designated Day and Period (Vacation Hold) Hold Temp ❑Press twice. ❑ Press or until display shows desired temperature setpoint. ❑ Press Time until the desired number of days that you will be away (1 through 255) is displayed. Wake Leave Return Sleep ❑Press , , or to select the program period when you want the program to restart. Run Program NOTE: If Vacation Hold needs to be cancelled before designated time, press to return to the program. Daylight
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For complete instructions on replacing or cleaning your furnace filter, humidifier pad or UV lamp, see the product owners manuals. Contact your local contractor or visit www.honeywell.com/yourhome. STEP 12. SET THE FAN AND SYSTEM SWITCHES First set Fan Fan On: The fan runs continuously. Use for improved air On Auto switch. circulation or for more efficient central air cleaning. (In a heat-only Fan system, fan runs continuously only if fan relay is connected to the G thermostat terminal
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IF YOU HAVE A PROBLEM Table 3. Solution Guide. If... Then
Display does not appear. Make sure the batteries are fresh and installed correctly. Make sure the thermostat is mounted and latched on the wallplate. 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°F to 90°F (4.5°C to 32°C) for heating. or the cooling lower). 45°F to 99°F (7°C to 37°C) for cooling.
