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Programmable Heat and/or Cool
Low Voltage (20 to 30 Vac) Thermostat and Wallplate
Model CT3550
Para pedir estas instrucciones en español, llame al 1-800-468-1502.
Pour obtenir ce ode demploi en français, composer le 1-800-468-1502.
Table of Contents
Step 1. Prepare for Installation ..................................................................................................................................
Step 2. Remove Old Thermostat ...............................................................................................................................
Step 3. Mount Thermostat Wallplate .........................................................................................................................
Step 4. Wire Wallplate Terminals ...............................................................................................................................
Step 5. Install the Batteries .......................................................................................................................................
Step 6. Mount the Thermostat ................................................................................................................................... 10
Step 7. Customize Your Thermostat .......................................................................................................................... 11
Step 8. Set the Clock ................................................................................................................................................. 13
Step 9. Programming ................................................................................................................................................ 13
Step 10. Operating Your Thermostat ......................................................................................................................... 16
Step 11. Set the Fan and System Key ...................................................................................................................... 17
Smart Response™ Technology ................................................................................................................................. 20
Wiring Diagrams ........................................................................................................................................................ 21
® U.S. Registered Trademark
Copyright © 2001 Honeywell •
Honeywell CT3550
PROGRAMMABLE THERMOSTAT
•All Rights Reserved
OWNER'S GUIDE
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69-1284-2
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Summary of Contents for Honeywell CT3550
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Page 1: Table Of Contents
Step 10. Operating Your Thermostat ... 16 Step 11. Set the Fan and System Key ... 17 Smart Response™ Technology ... 20 Wiring Diagrams ... 21 ® U.S. Registered Trademark Copyright © 2001 Honeywell • Honeywell CT3550 PROGRAMMABLE THERMOSTAT •All Rights Reserved OWNER’S GUIDE... - Page 2 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.
- Page 3 DIGITAL DISPLAY SET CURRENT DAY/TIME SETS CURRENT TIME AND DAY RUN PROGRAM RETURNS THERMOSTAT TO NORMAL OPERATING MODE Program Hold Temp HOLD TEMP SETS A HOLD TEMPERATURE SETTING AND ACTIVATES VACATION HOLD FEATURE SETS DAY OF THE WEEK TIME /TIME...
- Page 4 DISPLAYS EITHER CURRENT TIME OF DAY OR PROGRAM TIMES SHOWS WHEN THERMOSTAT IS IN THE PROGRAMMING MODE SHOWS VACATION HOLD DURATION Set Program Hold for SHOWS CURRENT Em Ht DAY OR DAYS BEING PROGRAMMED Aux Ht TueWedThuFriSatSun Days WakeLeaveReturnSleep SHOWS CURRENT...
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Page 5: Step 1. Prepare For Installation
Baseboard Electric (120/240 line volt) Single Stage Heat Pump Multistage Heat Pumps/Multistage Equipment Compatible with 2-wire Honeywell and Taco zone valves. Not compatible with 3-wire zone valves or 2-wire White Rodgers no. 1361 zone valves. Not compatible with any 120/240 volt system. -
Page 6: Step 2. Remove Old Thermostat
Replacing a Clock Thermostat that has C or C1 Clock Terminals If you are 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. -
Page 7: Step 3. Mount Thermostat Wallplate
Replacing a Thermostat that has Three Wires If you have three wires for a heating only system and can operate the fan using the fan ON switch this thermostat works with your system. However, some hot water (zoned) heating systems also have three wires. Your thermostat will work only if you install an isolating relay on these systems. -
Page 8: Step 4. Wire Wallplate Terminals
(see illustration). Tighten the terminals. FOR WRAPAROUND INSERTION STRIP 7/16 IN. (11 MM). Plug the hole in the wall with insulation to help prevent drafts from adversely affecting thermostat operation. 69-1284—2 FOR STRAIGHT INSERTION STRIP 5/16 IN. (8 MM). -
Page 9: Step 5. Install The Batteries
G, F If both RH and R terminals are present on existing thermostat, remove jumper and connect Rh to R and R to Rc. Do not connect both O and B when wiring to a single stage heat pump. Connect O to O. Tape off B. -
Page 10: Step 6. Mount The Thermostat
As a precaution when leaving home for longer than a month, change batteries before leaving to prevent the system from shutting down due to lack of power. Always use fresh alkaline batteries. Nonalkaline batteries do not last as long. They also can leak, causing damage to the thermostat and the wall surface. Honeywell recommends Energizer® batteries. -
Page 11: Step 7. Customize Your Thermostat
Your Honeywell CT3550 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. - Page 12 Press until display shows your furnace or boiler type. Press Time to move to next feature or Smart Response™ Technology (Feature Number 13) Smart Response technology options are: — 0 = Smart Response technology on (preset). — 1 = Smart Response technology off. To turn Smart Response technology on or off: Press once.
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Page 13: Step 8. Set The Clock
Press Program STEP 9. PROGRAMMING The keyboard is located behind the thermostat cover. The three most frequently used keys are near the display. Pressing displays the current temperature settings. Pressing the thermostat displays day, time, program period, temperature, system and fan settings. - Page 14 Table 3 can be helpful when planning your schedule of time and temperature settings. The thermostat default settings are shown in parentheses ( ). Period Default Setting Wake Time (6:00AM) Heat (70°F/21°C) Cool (78°F/25.5°C) Leave Time (8:00AM) Heat (62°F/16.5°C) Cool (85°F/29.5°C)
- Page 15 Press 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) for cooling. Heat/Cool Press to switch between setpoints. Settings NOTE: Program times are the same for heating and cooling. Press until the display shows the desired temperature setpoint.
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Page 16: Step 10. Operating Your Thermostat
Change Temperature Setting Until the Next Program Period (Temporary Change) Press 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 you press Program Change Temperature Setting Indefinitely (Hold) -
Page 17: Step 11. Set The Fan And System Key
Set the Fan Key Fan On: The fan runs continuously. Use for improved air circulation or more efficient central air cleaning. (In a heat only system, the fan runs continuously only if the fan relay is connected to the G thermostat terminal). Press until display shows On. - Page 18 Make sure the batteries are 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. • Make sure the temperature setpoints are: 40 to 90°F (4.5 to 32°C) for heating.
- Page 19 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.
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Page 20: Smart Response™ Technology
SMART RESPONSE™ TECHNOLOGY Your CT3550 is actually a small computer. The Smart Response technology calculates the correct time of day to turn on your heating or cooling system. Smart Response technology considers the following information. • Air temperature. • Wall temperature. -
Page 21: Wiring Diagrams
2-WIRE HEAT-ONLY (JUMPER INTACT) THERMOSTAT RC O W Y HEATING RELAY OR VALVE COIL 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 3-WIRE HEAT ONLY WITH FAN (JUMPER INTACT) THERMOSTAT RC O W Y HEATING RELAY OR... - Page 22 RELAY OR RELAY VALVE COIL 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. Notice: This thermostat is a Class B digital apparatus that complies with Canadian Radio Interference Regulations, CRC c. 1374. 69-1284—2 COOLING CONTACTOR COIL M10619...
- Page 23 Golden Valley, MN 55422-3992 This warranty does not cover removal or reinstallation costs. This warranty shall not apply if it is shown by Honeywell that the defect or malfunction was caused by damage which occurred while the product was in the possession of a consumer.
- Page 24 Home and Building Control Home and Building Control Honeywell Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9 69-1284—2 J.H. Rev. 04-01 Printed in U.S.A. on recycled paper containing at least 10% post-consumer paper fibers.