Owner's Manual
Page 1
... Model CT3550 Honeywell CT3550 PROGRAMMABLE THERMOSTAT OWNER'S GUIDE Para pedir estas instrucciones en español, llame al 1-800-468-1502. Set the Fan and System Key ...17 Smart Response™ Technology ...20 Wiring Diagrams ...21 ® U.S. Remove Old Thermostat ...6 Step 3. Registered Trademark Copyright © 2001 Honeywell • •All Rights Reserved Place Bar Code Here 69- 1284- 2 Wire Wallplate Terminals ...8 Step 5. Set the Clock ...13 Step 9. Install the Batteries ...9 Step 6. Customize Your Thermostat...
... Model CT3550 Honeywell CT3550 PROGRAMMABLE THERMOSTAT OWNER'S GUIDE Para pedir estas instrucciones en español, llame al 1-800-468-1502. Set the Fan and System Key ...17 Smart Response™ Technology ...20 Wiring Diagrams ...21 ® U.S. Remove Old Thermostat ...6 Step 3. Registered Trademark Copyright © 2001 Honeywell • •All Rights Reserved Place Bar Code Here 69- 1284- 2 Wire Wallplate Terminals ...8 Step 5. Set the Clock ...13 Step 9. Install the Batteries ...9 Step 6. Customize Your Thermostat...
Owner's Manual
Page 2
... place your old control in a sealed tube. This manual answers many of an old control containing mercury in the trash. MERCURY NOTICE If this control, or of the questions that ; • Keeps you comfortable by automatically calculating exactly when the furnace or air conditioning should go to follow these instructions carefully. You can use the preprogrammed schedule, or set your new Honeywell thermostat the smart thermostat that...
... place your old control in a sealed tube. This manual answers many of an old control containing mercury in the trash. MERCURY NOTICE If this control, or of the questions that ; • Keeps you comfortable by automatically calculating exactly when the furnace or air conditioning should go to follow these instructions carefully. You can use the preprogrammed schedule, or set your new Honeywell thermostat the smart thermostat that...
Owner's Manual
Page 3
DIGITAL DISPLAY SET CURRENT DAY/TIME SETS CURRENT TIME AND DAY RUN PROGRAM RETURNS THERMOSTAT TO NORMAL OPERATING MODE Run Program Set Current Day/Time Time Wake Set Program Leave Return Sleep HOLD TEMP SETS A HOLD TEMPERATURE SETTING AND ACTIVATES VACATION HOLD FEATURE Hold Temp Day Heat/Cool Settings Fan System DAY SETS DAY OF THE WEEK TIME /TIME SETS TIME FORWARD OR BACK RAISES TEMPERATURE SETTING LOWERS TEMPERATURE SETTING DISPLAYS CURRENT HEAT/COOL TEMPERATURE SETTING PROGRAM PERIODS WAKE/LEAVE/RETURN/SLEEP: ENTERS PROGRAMMING MODE HEAT/COOL SETTING SWITCHES BETWEEN ...
DIGITAL DISPLAY SET CURRENT DAY/TIME SETS CURRENT TIME AND DAY RUN PROGRAM RETURNS THERMOSTAT TO NORMAL OPERATING MODE Run Program Set Current Day/Time Time Wake Set Program Leave Return Sleep HOLD TEMP SETS A HOLD TEMPERATURE SETTING AND ACTIVATES VACATION HOLD FEATURE Hold Temp Day Heat/Cool Settings Fan System DAY SETS DAY OF THE WEEK TIME /TIME SETS TIME FORWARD OR BACK RAISES TEMPERATURE SETTING LOWERS TEMPERATURE SETTING DISPLAYS CURRENT HEAT/COOL TEMPERATURE SETTING PROGRAM PERIODS WAKE/LEAVE/RETURN/SLEEP: ENTERS PROGRAMMING MODE HEAT/COOL SETTING SWITCHES BETWEEN ...
Owner's Manual
Page 4
... THE SET DAY/TIME MODE SHOWS TEMPERATURE SETTING CHANGED FOR THIS PROGRAM PERIOD SHOWS VACATION HOLD DURATION SHOWS CURRENT DAY OR DAYS BEING PROGRAMMED SHOWS CURRENT PROGRAM PERIOD OR PERIOD BEING PROGRAMMED Set Program Set Day/Time Temporary Setting Hold for Em Ht AM Room Aux Ht Humid MonTueWedThuFriSatSun Days WakeLeaveReturnSleep In Recovery Filter Outdoor Repl Batt System Fan Em Heat Off Cool Auto Wait On Auto SHOWS THE TEMPERATURE DISPLAYED IS THE CURRENT SET TEMPERATURE SHOWS THE TEMPERATURE DISPLAYED IS THE CURRENT ROOM TEMPERATURE SHOWS THE BATTERIES ARE LOW...
... THE SET DAY/TIME MODE SHOWS TEMPERATURE SETTING CHANGED FOR THIS PROGRAM PERIOD SHOWS VACATION HOLD DURATION SHOWS CURRENT DAY OR DAYS BEING PROGRAMMED SHOWS CURRENT PROGRAM PERIOD OR PERIOD BEING PROGRAMMED Set Program Set Day/Time Temporary Setting Hold for Em Ht AM Room Aux Ht Humid MonTueWedThuFriSatSun Days WakeLeaveReturnSleep In Recovery Filter Outdoor Repl Batt System Fan Em Heat Off Cool Auto Wait On Auto SHOWS THE TEMPERATURE DISPLAYED IS THE CURRENT SET TEMPERATURE SHOWS THE TEMPERATURE DISPLAYED IS THE CURRENT ROOM TEMPERATURE SHOWS THE BATTERIES ARE LOW...
Owner's Manual
Page 5
... Gas - Compatibility Chart. Electronic Ignition System Type Gas-fired Boilers Gas - 750 Millivolt Heat Oil-Fired Boilers Oil-Fired Furnace Electric Furnace Electric Air Conditioning Baseboard Electric (120/240 line volt)b Single Stage Heat Pump Multistage Heat Pumps/Multistage Equipment Compatibility with CT3550 Yes Yes Yesa Yes Yesa Yes Yes Yes No Yes No a Compatible with your system is compatible with 2-wire Honeywell and Taco zone valves. PREPARE FOR INSTALLATION...
... Gas - Compatibility Chart. Electronic Ignition System Type Gas-fired Boilers Gas - 750 Millivolt Heat Oil-Fired Boilers Oil-Fired Furnace Electric Furnace Electric Air Conditioning Baseboard Electric (120/240 line volt)b Single Stage Heat Pump Multistage Heat Pumps/Multistage Equipment Compatibility with CT3550 Yes Yes Yesa Yes Yesa Yes Yes Yes No Yes No a Compatible with your system is compatible with 2-wire Honeywell and Taco zone valves. PREPARE FOR INSTALLATION...
Owner's Manual
Page 6
... does not work with multistage systems, so return the product to be labeled. To avoid compressor damage, do not need to the place of the new thermostat. As you can damage the transformer. Do not allow them from the old thermostat. Replacing a Thermostat that has C or C1 Clock Terminals If you are replacing a Honeywell Chronotherm® Thermostat, you are six or more wires connected to keep them to...
... does not work with multistage systems, so return the product to be labeled. To avoid compressor damage, do not need to the place of the new thermostat. As you can damage the transformer. Do not allow them from the old thermostat. Replacing a Thermostat that has C or C1 Clock Terminals If you are replacing a Honeywell Chronotherm® Thermostat, you are six or more wires connected to keep them to...
Owner's Manual
Page 7
... install an isolating relay on the wall. holes where marked. Thermostat functions properly when not level. ❑ Tighten mounting screws. Your thermostat will work only if you have three wires. STEP 3. Drill two 3/16 in . Replacing a Thermostat that best fit the application. ❑ Remove the wallplate from the thermostat. Level the wallplate for a heating only system and can operate the fan using the fan ON switch this thermostat works...
... install an isolating relay on the wall. holes where marked. Thermostat functions properly when not level. ❑ Tighten mounting screws. Your thermostat will work only if you have three wires. STEP 3. Drill two 3/16 in . Replacing a Thermostat that best fit the application. ❑ Remove the wallplate from the thermostat. Level the wallplate for a heating only system and can operate the fan using the fan ON switch this thermostat works...
Owner's Manual
Page 8
... wiring procedures, call your new thermostat. Wraparound and straight connections are connected to Table 2. ❑ Remove the factory-installed jumper connecting terminals R and RC if wires are both of your old thermostat wire with local codes and ordinances. Refer to both acceptable, (see pp 21-22. ❑ Loosen the terminal screws. Slip each wire beneath its matching terminal. Refer to help prevent drafts from adversely affecting thermostat operation. 69-1284-2 8 Tighten the terminals...
... wiring procedures, call your new thermostat. Wraparound and straight connections are connected to Table 2. ❑ Remove the factory-installed jumper connecting terminals R and RC if wires are both of your old thermostat wire with local codes and ordinances. Refer to both acceptable, (see pp 21-22. ❑ Loosen the terminal screws. Slip each wire beneath its matching terminal. Refer to help prevent drafts from adversely affecting thermostat operation. 69-1284-2 8 Tighten the terminals...
Owner's Manual
Page 9
... wiring to Rc. Tape off end of the thermostat and the heating/cooling system. ❑ Install the batteries in the wall. INSTALL THE BATTERIES IMPORTANT Three AA alkaline batteries are present on Old Thermostat Connect To Description R, RHa, 4, V R Power Rc, Ra Rc Power for programming and operation of the wire with the thermostat. Call 1-800-468-1502. Terminal Designations on Old and New Thermostats Terminal on existing thermostat, remove jumper and connect Rh to R and R to a single stage heat pump. Second stage heat. Connect...
... wiring to Rc. Tape off end of the thermostat and the heating/cooling system. ❑ Install the batteries in the wall. INSTALL THE BATTERIES IMPORTANT Three AA alkaline batteries are present on Old Thermostat Connect To Description R, RHa, 4, V R Power Rc, Ra Rc Power for programming and operation of the wire with the thermostat. Call 1-800-468-1502. Terminal Designations on Old and New Thermostats Terminal on existing thermostat, remove jumper and connect Rh to R and R to a single stage heat pump. Second stage heat. Connect...
Owner's Manual
Page 10
... M12703 Replace the batteries as soon as long. Always use fresh alkaline batteries. STEP 6. IMPORTANT Although the thermostat has a low battery indicator, replace the batteries once per year to prevent leakage and to prevent the thermostat and heating/cooling system from shutting down due to lack of battery power in the thermostat. Honeywell recommends Energizer® batteries. MOUNT THE THERMOSTAT A. Refer to Set the Clock for longer than a month, change batteries before the batteries run...
... M12703 Replace the batteries as soon as long. Always use fresh alkaline batteries. STEP 6. IMPORTANT Although the thermostat has a low battery indicator, replace the batteries once per year to prevent leakage and to prevent the thermostat and heating/cooling system from shutting down due to lack of battery power in the thermostat. Honeywell recommends Energizer® batteries. MOUNT THE THERMOSTAT A. Refer to Set the Clock for longer than a month, change batteries before the batteries run...
Owner's Manual
Page 11
... - 0 = Gas or oil furnace. Temperature °F. - 12-hour clock format. Furnace controls fan operation during heating. CUSTOMIZE YOUR THERMOSTAT Your Honeywell CT3550 thermostat comes preset to main display. You can damage the keyboard. ❑ Press and hold down , , and , simultaneously until the screen shows. To change fan operation: ❑ Press once. ❑ Press Time Run to move to next feature or Program to return to the most commonly used settings. Fan Operation (Feature Number 2) Fan operation options are : - Gas or oil forced air furnace...
... - 0 = Gas or oil furnace. Temperature °F. - 12-hour clock format. Furnace controls fan operation during heating. CUSTOMIZE YOUR THERMOSTAT Your Honeywell CT3550 thermostat comes preset to main display. You can damage the keyboard. ❑ Press and hold down , , and , simultaneously until the screen shows. To change fan operation: ❑ Press once. ❑ Press Time Run to move to next feature or Program to return to the most commonly used settings. Fan Operation (Feature Number 2) Fan operation options are : - Gas or oil forced air furnace...
Owner's Manual
Page 13
... house at a comfortable temperature when you are near the display. Pressing displays the current temperature settings. The thermostat displays day, time, program period, temperature, system and fan settings. Factory Set Function (Feature Number 37) Do not change the temperature. Program STEP 9. Leave (This is a higher temperature during the heating season and a lower temperature during the cooling season). 13 69-1284-2 Set Current Day/Time ❑ Press Day until screen shows current time. (Tapping the Day/Time will advance the time in one hour ❑ Press Run...
... house at a comfortable temperature when you are near the display. Pressing displays the current temperature settings. The thermostat displays day, time, program period, temperature, system and fan settings. Factory Set Function (Feature Number 37) Do not change the temperature. Program STEP 9. Leave (This is a higher temperature during the heating season and a lower temperature during the cooling season). 13 69-1284-2 Set Current Day/Time ❑ Press Day until screen shows current time. (Tapping the Day/Time will advance the time in one hour ❑ Press Run...
Owner's Manual
Page 15
... time and temperature clear. ❑ Repeat the above steps for the program period you want to be cleared. ❑ Press Run . Your weekday is at the desired setting (On or Auto). Sun). ❑ Press and hold the , Leave Return , or Sleep for each period to clear. ❑ Press Day until the desired wake temperature displays. Program 15 69-1284-2 The setpoint temperature range is programmed. NOTE: Setting Fan to switch between setpoints. Program...
... time and temperature clear. ❑ Repeat the above steps for the program period you want to be cleared. ❑ Press Run . Your weekday is at the desired setting (On or Auto). Sun). ❑ Press and hold the , Leave Return , or Sleep for each period to clear. ❑ Press Day until the desired wake temperature displays. Program 15 69-1284-2 The setpoint temperature range is programmed. NOTE: Setting Fan to switch between setpoints. Program...
Owner's Manual
Page 16
... time until the desired number of days that you will be cancelled before the designated time, press Program to return to restart. Program Change Temperature Setting Indefinitely (Hold) ❑ Press System until the screen shows the desired temperature setting. OPERATING YOUR THERMOSTAT Change Temperature Setting Until the Next Program Period (Temporary Change) ❑ Press or until "Heat" or "Cool" is displayed. NOTE: The temporary temperature setting is displayed for about 3 seconds and then the room temperature is displayed. ❑ Press Hold Temp...
... time until the desired number of days that you will be cancelled before the designated time, press Program to return to restart. Program Change Temperature Setting Indefinitely (Hold) ❑ Press System until the screen shows the desired temperature setting. OPERATING YOUR THERMOSTAT Change Temperature Setting Until the Next Program Period (Temporary Change) ❑ Press or until "Heat" or "Cool" is displayed. NOTE: The temporary temperature setting is displayed for about 3 seconds and then the room temperature is displayed. ❑ Press Hold Temp...
Owner's Manual
Page 17
Use for most homes. Press Fan until the display shows Cool. 17 69-1284-2 Press System until display shows Auto. Press Fan until the display shows Off. NOTE: If you set the fan to On during normal operation, the fan reverts to the G thermostat terminal). SET THE FAN AND SYSTEM KEY Set the Fan Key Fan On: The fan runs continuously. Off: Both the heating and air conditioning systems are off. Press System until display shows...
Use for most homes. Press Fan until the display shows Cool. 17 69-1284-2 Press System until display shows Auto. Press Fan until the display shows Off. NOTE: If you set the fan to On during normal operation, the fan reverts to the G thermostat terminal). SET THE FAN AND SYSTEM KEY Set the Fan Key Fan On: The fan runs continuously. Off: Both the heating and air conditioning systems are off. Press System until display shows...
Owner's Manual
Page 18
... all of this has been checked, contact your local heating and cooling contractor. Display flashes during programming. The heating setting range is mounted and latched on . The cooling setting range is in the Off position. • Wait five minutes for cooling. Solution Guide. Temperature settings will not change • Make sure the temperature setpoints are installed correctly. • Make sure the thermostat is 40°F to 90°F (4.5°C to...
... all of this has been checked, contact your local heating and cooling contractor. Display flashes during programming. The heating setting range is mounted and latched on . The cooling setting range is in the Off position. • Wait five minutes for cooling. Solution Guide. Temperature settings will not change • Make sure the temperature setpoints are installed correctly. • Make sure the thermostat is 40°F to 90°F (4.5°C to...
Owner's Manual
Page 19
... of thermostat). • Thermostat date code. (Located below model number). • Type of heating/cooling system (for this thermostat. Make sure the current time and day settings are correct. 3. Table 4. Then... 1. Make sure the AM and PM settings are correct. 4. Temperature change occurs at 1-800-468-1502. Check the program times for Smart Response control, the start times occur before your thermostat is set for the period in question. 2. If... Solution Guide...
... of thermostat). • Thermostat date code. (Located below model number). • Type of heating/cooling system (for this thermostat. Make sure the current time and day settings are correct. 3. Table 4. Then... 1. Make sure the AM and PM settings are correct. 4. Temperature change occurs at 1-800-468-1502. Check the program times for Smart Response control, the start times occur before your thermostat is set for the period in question. 2. If... Solution Guide...
Owner's Manual
Page 20
... Recovery IS DISPLAYED, PRESS TO SEE THE COMFORT SETPOINT. Smart Response technology considers the following information. • Air temperature. • Wall temperature. • The time of your home, and your heating or cooling system. See Step 7. Each day it checks how closely it hit the recovery target and then adjusts the next days recovery start time accordingly. • It takes a few days after installation for the thermostat to adjust to turn...
... Recovery IS DISPLAYED, PRESS TO SEE THE COMFORT SETPOINT. Smart Response technology considers the following information. • Air temperature. • Wall temperature. • The time of your home, and your heating or cooling system. See Step 7. Each day it checks how closely it hit the recovery target and then adjusts the next days recovery start time accordingly. • It takes a few days after installation for the thermostat to adjust to turn...
Owner's Manual
Page 21
...-STAGE HEAT PUMP (JUMPER INTACT) M10617 THERMOSTAT B RC O W Y R G 3 2 COMPRESSOR HEAT CHANGEOVER CONTACTOR 2 VALVE 1 COOL CHANGEOVER FAN VALVE RELAY 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 1 M10618 HEATING COOLING FAN RELAY OR CONTACTOR RELAY 1 VALVE COIL COIL 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 USE EITHER O OR B FOR HEAT PUMP CHANGEOVER. 3 USING A JUMPER WIRE (NOT SUPPLIED) CONNECT W TO Y. WIRING DIAGRAMS 2-WIRE HEAT...
...-STAGE HEAT PUMP (JUMPER INTACT) M10617 THERMOSTAT B RC O W Y R G 3 2 COMPRESSOR HEAT CHANGEOVER CONTACTOR 2 VALVE 1 COOL CHANGEOVER FAN VALVE RELAY 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 1 M10618 HEATING COOLING FAN RELAY OR CONTACTOR RELAY 1 VALVE COIL COIL 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 USE EITHER O OR B FOR HEAT PUMP CHANGEOVER. 3 USING A JUMPER WIRE (NOT SUPPLIED) CONNECT W TO Y. WIRING DIAGRAMS 2-WIRE HEAT...
Owner's Manual
Page 22
... Notice: This thermostat is a Class B digital apparatus that complies with Canadian Radio Interference Regulations, CRC c. 1374. 69-1284-2 22 PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 5-WIRE HEAT/COOL (JUMPER REMOVED) THERMOSTAT B RC O W Y R G 5-WIRE HEAT/COOL WITH DAMPER (JUMPER INTACT) THERMOSTAT B RC O W Y R G HEATING RELAY OR VALVE COIL 1 FAN RELAY COOLING CONTACTOR COIL 1 1 POWER SUPPLY. M10619 HEAT DAMPER HEAT RELAY COMPRESSOR CONTACTOR COOL DAMPER 1 POWER SUPPLY.
... Notice: This thermostat is a Class B digital apparatus that complies with Canadian Radio Interference Regulations, CRC c. 1374. 69-1284-2 22 PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 5-WIRE HEAT/COOL (JUMPER REMOVED) THERMOSTAT B RC O W Y R G 5-WIRE HEAT/COOL WITH DAMPER (JUMPER INTACT) THERMOSTAT B RC O W Y R G HEATING RELAY OR VALVE COIL 1 FAN RELAY COOLING CONTACTOR COIL 1 1 POWER SUPPLY. M10619 HEAT DAMPER HEAT RELAY COMPRESSOR CONTACTOR COOL DAMPER 1 POWER SUPPLY.