Honeywell 3355 Programmable Thermostat
RECYCLING THERMOSTAT
Welcome to the world of comfort and energy savings with your new Honeywell MagicStat® Programmable Thermostat.
Your new thermostat will automatically control the temperature in your home, keeping you comfortable while saving energy when programmed according to the instructions in
this manual.
Direct any questions concerning the application of this thermostat to Honeywell Customer Assistance at 1-800-468-1502, Monday-Friday 7:00 a.m.-5:30 p.m., Central time.
If this thermostat is replacing a thermo-stat that contains mercury in a sealed tube, see Fig. 1, do not place your old thermostat in the trash. Contact your local waste management authority for instructions regarding recycling and the proper disposal of your old thermostat.
If you have questions, call Honeywell Inc. at 1-800-468-1502.
Installation
Step 1: Prepare for Installation
Check Table 1 to make sure this thermostat is compatible with your system. If not, return to the retailer. For more information, call Honeywell Customer Assistance, toll-free 1-800-468-1502.
Table 1. Compatibility Chart.
| System Type | Compatible With CT3355 |
| Gas—Standing Pilot | Yes |
| Gas—Electronic Ignition Gas-Fired Boilers | Yes
Yes a, b |
| Gas—Millivolt
Oil-Fired Boilers |
No
Yes a, b |
| Oil-Fired Furnace | Yes |
| Electric Furnace | Yes |
| Electric Air Conditioning | Yes |
| Baseboard Electric (120/240 Line Volt) | No |
| Heat Pumps/Multistage Equipment | No |
Not compatible with any 120/240 volt circuit.
- Compatible with 2-wire Honeywell Zone Valves. Isolating relay required for 3-wire thermostats for zone valves. Not compatible with 2-wire White-Rodgers no. 1361 Valves.
- Compatible with hot water baseboard systems. Will not work efficiently on steam or gravity systems.
Acquire tools and items below as needed. Also purchase two AA alkaline batteries; we recom-mend Energizer® batteries.
Step 2: Remove Old Thermostat
- Test to make certain that your heating and cooling systems are working properly. If either 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 system at the furnace, or at the fuse/circuit breaker panel.
- Carefully unpack your new thermostat and mounting plate; save package of screws, instructions and receipt.
- Remove the cover from the old thermostat. If it does not snap off when pulled firmly from the bottom, check for a screw used to lock on the cover.
- Loosen screws holding thermostat to subbase, wallplate or wall, and lift away.
- Disconnect wires from the old thermostat or subbase. As you disconnect each wire, use masking tape to label it with the old terminal designation. If there are only two wires, they do not need to be labeled. If there is an extra wire that is not connected to your old thermostat, you will also not be connecting it to your new thermostat. Wrap wires as shown to keep them from falling back into the wall.
Replacing a Clock Thermostat that has C or C1 Clock Terminals?
If you are replacing a Honeywell Chronotherm® Thermostat, you can find one or two wires that go to the C or C1 clock terminals on the Chronotherm® Thermostat wiring wallplate. Do not allow them to touch, or you may damage your transformer. Disconnect the wires and wrap them separately, using electrical tape. Do not wrap them together. Place the wires where they do not interfere with the operation of the new thermostat. Record the colors and terminal designation labels of the remaining wires.
Six or more wires?
If there are six or more wires (excluding clock wires attached to terminals), you probably have a variation of a heat pump or multistage system. The thermostat is not compatible with such systems so return the product to the place of purchase. If you would like information about which programmable thermostats work with your system, call Honeywell Customer Assistance at 1-800-468-1502.
Three thermostat wires?
If you have three wires for heating only and can operate the fan using the fan ON switch, this thermostat works with your system. However, some hot water (zoned) heating systems have three thermostat wires. The thermostat does not work without installing an isolating relay on these systems. For details, call Honeywell Customer Assistance at 1-800-468-1502.
Step 3: Install Batteries
IMPORTANT Batteries must be installed for programming and operation of the thermostat and heating/cooling system.
- Purchase two AA alkaline batteries; non-alkaline batteries do not last as long, and can leak, causing damage to the thermostat or the wall surface. We recommend Energizer® batteries.
- Make sure the thermostat is set to the OFF position.
- Use a coin to remove the battery door.
- Install the fresh batteries as shown, making sure positive and negative terminals are oriented correctly.
- Replace the battery door.
- As the batteries are running low, a bAt Lo indicator flashes for one or two months before batteries run out completely. Replace the batteries as soon as possible after the indicator starts flashing. If you do not replace the batteries sometime while bAt Lo is flashing, the indicator eventually stops flashing. bAt Lo stays on without flashing, indicating the thermostat and heating/cooling system have stopped working when the batteries are almost completely dead.
- After the batteries are completely dead, the bAt Lo indicator disappears, leaving a completely blank display.
- Press down on the left ends of the batteries to remove. If you insert the new batteries within 20 to 30 seconds of removing the old ones, you do not have to reprogram the thermostat. However, if the display is blank, the batteries are dead or incorrectly installed and you must reprogram. See pages 14 and 15 to reprogram.
IMPORTANT Although the thermostat has a low battery indicator, replace the batteries once a year to prevent the thermostat and heating/cooling system from shutting down due to lack of battery power. - As a precaution, when leaving home for longer than a month, change batteries before you leave to prevent the system from shutting down due to lack of battery power.
Step 4: Program Thermostat
- After the batteries are installed, the thermostat can be easily programmed in your hand, before it is installed on the wall.
- If you prefer to program the thermostat after it is installed on the wall, skip to page 18, and return later to this programming section.
- The following Personal Programming Chart (pages 12 and 13) can be helpful for planning your program schedule of time and tempera-ture settings for various times of the day.
- Four time periods are available during week-days — WAKE, LEAVE, RETURN, and SLEEP. These periods can be seen individually on the display as you press the SET SCHEDULE key.
- WAKE is the time period you want the house at a comfortable temperature when you get up and while you get ready for work or school. When deciding what time to set for your WAKE period, include extra lead time, depending on the outside temperature and your furnace response time, to give the furnace a head start to heat the house before you get up. (This will be a higher temperature during heating season, or a lower temperature during cooling season.)
- LEAVE is the time period you can set for an energy-saving temperature while you are away at work or school. (This will be a lower tem-perature during heating season, or a higher temperature during cooling season.)
- RETURN is the time period you want the house at a comfortable temperature for activities before bedtime. When deciding what time to set for your RETURN period, include extra lead time, depending on the outside temperature and your furnace response time, to give the furnace a head start to heat the house before you arrive home. (Again, this is higher heating or lower for cooling.)
- SLEEP is the time period you can set for an energy-saving temperature while you are sleeping. (Again, this is lower for heating or higher for cooling. For more comfortable sleeping, some people choose not to raise the cool temperature during the night.)
- You will set one schedule for weekdays and another for weekends, because your require-ments will probably be different for each. Also, during weekends, only the WAKE and SLEEP time periods are available.
- Fill in the times and temperatures you desire for weekdays and weekends. If you decide not to program the thermostat, it will automatically control heating at 68°F (20°C), and cooling at 78°F (26°C), 24 hours a day. Also, you do not need to enter a time and temperature program for all periods if your schedule does not require it. For example, a house that is occupied during weekdays would only require programs for WAKE and SLEEP.
- If no program is entered for the weekends, the thermostat will operate on the weekday SLEEP program all weekend.
- Before programming, remove the clear plastic overlay covering the display.
- When pressing the keys, use the ball of your finger or a soft pencil eraser. Using sharp fingernails or pencil points can damage the keypad.
- If you make an error at any time during programming, just press the RUN PROGRAM key, and continue again at the step where you left off.
Personal Programming Chart
- WAKE and RETURN start times should include extra lead time based on outside temperature and furnace response time, to give your furnace a head start to heat the house.
- The temperatures cannot be set any higher than 88°F (31°C) or any lower than 45°F (7°C).
- WAKE and RETURN start times should include extra lead time based on outside temperature and furnace response time, to give your furnace a head start to heat the house.
- The temperatures cannot be set any higher than 88°F (31°C) or any lower than 45°F (7°C).
NOTE: If you decide not to program the thermostat, it automatically controls heating at 68°F (20°C), and cooling at 78°F (26°C), 24 hours a day. This guide can be used for programming your new thermostat.
NOTE: Batteries are required for operation and programming. When inserting batteries, set system switch to OFF. Remove the battery door (on the thermostat left side) using a coin at the bottom. Follow instructions on pages 8 and 9.
Set Current Time/Day
- To set the time, press and release
once, then press 
until current time shows; to set the day, - Press and release again, then press until current day shows; then press
Heating Program
- With system switch at HEAT, press and release
once. WAKE, Mon-Fri and SET appear on the display. - Press to program WAKE time and press
to program WAKE temperature for Mon-Fri. Repeat sequence for LEAVE, RETURN, and SLEEP. - Press until SAT SUN, WAKE and SET appear on the display. Press to program
- WAKE time and to program WAKE temperature for Sat-Sun. Repeat sequence for SLEEP.
Cooling Program
- With system switch at COOL, follow the same instructions as for the Heating Program.
- After programming, adjust the fan and system switches, as desired. Press and release to start the program.
A quick guide for operating or making changes follows:
NOTE: System switch must be set to Heat or Cool to perform the following.
- Temporarily Change temperature for current period only— press ; TEMPORARY indicator shows on display; canceling itself at the next scheduled change, or to cancel sooner press .
- Hold a temperature indefinitely (such as when on vacation)— press
, then press - HOLD appears on the display; to cancel, press.
- Check Current Temperature Setting— press
. (When using TEMPORARILY CHANGE or HOLD, pressing this cancels your change.) - Check Programs— press , repeatedly to view each time and temperature; then press .
- Cancel a program— press, until program to cancel shows; then press
. - Check Usage — Press
for length of time heat or air conditioning has been running today. since midnight; press again for yesterday’s usage, press again for cumulative; press to clear cumulative reading, if desired; then press . - Permanently Change a program—Repeat steps in Heating Program section or Cooling Program section (pages 14 through 16), as applicable.
- Return to normal program or start program — press.
Questions?
Call Honeywell Customer Assistance 1-800-468-1502.
Step 5: Adjust Fan Operation Switch, as Required
The thermostat fan operation switch, labeled FUEL SWITCH (see illustration on page 20) is factory-set in the F position. This is the correct setting for most systems. If your system is an electric heat system, set the switch to E. The E setting allows the fan to turn on immediately with the heating or cooling in a system where the G terminal is connected.
Step 6: Adjust System On-Time, °F/C°, as Required
The system on-time is factory-set for a warm air, gas or oil heating system. If you are installing it on another type of system, adjust the on-time accordingly by setting screws A and B on the back of the thermostat. Use the heating system table shown in the illustration (page 20) as a guide. Optimize the system on-time according to the type of system to minimize room temperature swings. Setting the screw out one turn means turning the screw approximately 360° counterclockwise, or about one complete turn. In the unlikely event that you want a longer system on-time, readjust screws A and/or B as follows:
First, turn in both screws completely, then adjust for system type:
- Warm Air Furnace—Set at the Hot Water setting (A—out one turn, B—leave in).
- Electric Furnace—Leave at the Warm Air Furnace setting (A—leave in, B—leave in).
NOTE: This thermostat does not have a setting for steam/gravity air. Cycles would not be long enough for accurate temperature control.
IMPORTANT When using a high efficiency furnace such as a 90% or greater AFUE (Average Fuel Utilization Efficiency) unit, adjust screw A out one turn and leave screw B in. The thermostat is set to read the temperature in degrees Fahrenheit. If readings are desired in degrees Celsius, adjust screw C out one turn, as shown in the illustration.
THERMOSTAT BACK
Step 7: Mount Thermostat Mounting Plate
- Position the mounting plate on the wall. Use a level to make sure the mounting plate is level. Use a pencil to mark the two mounting holes.
- Remove the mounting plate from the wall, and drill 3/16-inch holes in the wall (if drywall) as marked. For firmer material such as plaster or wood, drill 7/32-inch holes. Gently tap anchors (provided) into drilled holes until flush with the wall.
- Reposition mounting plate over the holes, pulling wires through the wiring opening. Loosely insert two mounting screws into the holes.
- Level for appearance only; thermostat functions properly even when not level. Tighten the mounting screws.
Step 8: Wire Thermostat Terminals
NOTE: All wiring must comply with local codes and ordinances. If unsure about household wiring procedures, call your local heating/air conditioning contractor. Refer to masking tape labels you placed on the wires when you removed your old thermostat.
- Match the letter of your old thermostat wire with the terminal of the corresponding letter on the back of your new thermostat. Refer to illustrations on pages 25 and 26. Hold the thermostat as shown to minimize need for wire extenders. If wires are still too short, use wire connectors (purchased locally) to extend wires. See illustration for guidelines on using wire extenders.
- In 5-wire installations only, be sure to remove the factory-installed jumper connecting terminals R and Rc.
- Loosen the terminal screws and slip each wire beneath its matching terminal. See illustration (lower right) for wire insertion technique. Securely tighten the terminals.
- Plug the hole in the wall with insulation to help prevent drafts from adversely affecting the thermostat operation.
Step 9: Mount Thermostat
NOTE: To remove the thermostat from the wall, first pull out at the bottom of the thermostat, then remove the top.
Step 10: Check Thermostat Operation after Programming and Installing
Heating
Do not check heating system operation by jumpering thermostat terminals at the primary control such as the gas valve, zone valve, or oil burner control. This damages the thermostat, instead, jumper R and W wires at the thermostat.
- Move the system switch to HEAT and the fan switch to AUTO.
- Press key until the setting is about 10°F (6°C) above room temperature. The heating should start and the fan should run after a short delay (immediately if fan operation switch is set in E position).
- Press key until setting is about 10°F (6°C) below room temperature. The heating equipment should shut off.
Cooling
To avoid possible compressor damage, do not operate the cooling system when outside temperature is below 50°F (10°C). See compressor manufacturer instructions for further information.
NOTE: When cooling setting is changed, thermostat may delay up to five minutes before turning on the air conditioner. This delay protects the compressor.
- Move the system switch to COOL and the fan switch to AUTO.
- Press key until setting is about 10°F (6°C) below room temperature. The cooling equipment and fan should start.
- Press key until the setting is about 10°F (6°C) above room temperature. The cooling equipment and fan should stop.
- Move the system switch to OFF, with the fan switch at AUTO. The system and fan should be off.
Step 11: Set Fan and System Switches
First set the fan switch.
- FAN AUTO: Normal setting for most homes. 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.
Exception: If the fan operation switch on the back of the thermostat is set to the E position (see page 20), the fan operates only with the furnace.
- FAN ON: The fan runs continuously. Use for improved air circulation during special occasions or for more efficient electronic air cleaning. (In a heat-only system, fan runs continuously only if the fan relay is connected to the thermostat.)
Then set the system switch.
- COOL: The thermostat controls your air conditioning system.
- OFF: Both the heating and air conditioning systems are off.
- HEAT: The thermostat controls your heating system.
Troubleshooting Guide
If… Then…
- Display will not come on.
- Set the system switch to OFF. Remove batteries. Insert backward for at least five seconds to reset thermostat. Replace batteries correctly. Display should come on.
- Make sure batteries are fresh and installed correctly.
- Gently clean battery contacts using a soft pencil eraser. Do not use anything abrasive on the clips.
- Temperature display will not go lower than 45° F (7° C) or higher than 88° F (31° C) during programming.
You have reached the temperature setting limit. The setting range is 45° F to 88° F (7° C to 31° C). - Temperature change occurs at the wrong times.
Check the program times for the period in question. Be sure that AM and PM indications are correct. Make sure the current day and time are correct. Reprogram if necessary. - Heating will not come on.
- Check that the switch on the thermostat is set to HEAT.
- Check the system fuse or circuit breaker and replace or reset if necessary.
- Check for correct wiring and good connections.
- Jumper wires R and W. If heat does not come on, contact your heating dealer.
- If display is blank or shows bAt Lo, install fresh batteries.
- If temperature setting is higher than current temperature, and the display shows HEAT, contact Honeywell Customer Assistance at 1-800-468-1502.
- Cooling will not come on.
- Check that the switch on the thermostat is set to COOL.
- Check the system fuse or circuit breaker and replace or reset if necessary.
- Check for correct wiring and good connections.
- Jumper wires Rc and Y. If cooling does not come on, contact your cooling dealer.
- If display is blank or shows bAt Lo, install fresh batteries.
- The thermostat has a built-in time delay on cooling. Allow five to ten minutes after changing the setting before the air conditioner starts.
- Make sure the outdoor disconnect is energized (on).
- If temperature setting is lower than the current temperature, and the display shows COOL, move the system switch from COOL to OFF for ten minutes. After ten minutes, return the switch to the COOL position. If the air conditioner comes on, compressor may have reached its high limit temperature protection and shut down. If the air conditioner does not come on after the ten minutes and the display shows COOL, contact Honeywell Customer Assistance at 1-800-468-1502.
- If 2- or 4-wire installation, verify R-Rc jumper is installed.
- The house is too warm or too cool.
- Press PRESENT SETTING key to check the current temperature setting.
- If desired, change the temperature setting. See page 16.
- SYSTEM ON indicator is lit, but no heat is coming from the registers.
Allow time for the furnace to heat up and the fan to come on before checking for heat at the register. (Check to make sure system on-time is set correctly according to page 18 and 19.) - The furnace cycles too frequently or the system cycle length is too short or too long.
Readjust system on-time according to instructions on pages 18 and 19. - The thermostat’s current setting does not match the display temperature to within ± 1° .
- Check that the wiring hole in the wall behind the wallplate was plugged with insulation to prevent drafts that might adversely affect the thermostat operation.
- Be aware that it is normal for the current setting and display temperature to differ on occasion.
- During recovery from setback or setup, setting and display temperatures may differ for up to 30 minutes after recovery period.
- Incorrect room temperature showing on thermostat display.
- Make sure the hole behind the thermostat is plugged with insulation to help prevent drafts from adversely affecting the thermostat operation.
- The thermostat is factory-calibrated, and cannot be adjusted.
- bAt Lo remains on display after fresh batteries are installed.
Remove the batteries. Wait one hour. Install fresh alkaline batteries.
TYPICAL ENERGY SAVINGS FOR REPRESENTATIVE CITIES IN THE U.S. AND CANADA
Limited One-Year Warranty
Honeywell warrants this product, excluding battery, to be free from defects in the workmanship or materials, under normal use and service, for a period of one (1) year from the date of purchase by the consumer. If, at any time during the warranty period, the product is defective or malfunctions, Honeywell shall repair or replace it (at Honeywell’s option) within a reasonable period of time.
If the product is defective,
- return it, with a bill of sale or other dated proof of purchase, to the retailer from which you purchased it, or
- package it carefully, along with proof of purchase (including date of purchase) and a short description of the malfunction, and mail it, postage prepaid, to the following address
Honeywell Inc. Return Goods Department 1050 Berkshire Lane Plymouth, MN 55441-4437
in Canada: Honeywell Limited/Honeywell Limitée Product Services ON30 155 Gordon Baker Road North York, Ontario M2H 2C9
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.
Honeywell’s sole responsibility shall be to repair or replace the product within the terms stated above. HONEYWELL SHALL NOT BE LIABLE FOR ANY LOSS OR DAMAGE OF ANY KIND, INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING, DIRECTLY OR INDIRECTLY, FROM ANY BREACH OF ANY WARRANTY, EXPRESS OR IMPLIED, OR ANY OTHER FAILURE OF THIS PRODUCT. Some states do not allow the exclusion or limitation of incidental or consequential damages, so this limitation may not apply to you.
THIS WARRANTY IS THE ONLY EXPRESS WARRANTY HONEYWELL MAKES ON THIS PRODUCT. THE DURATION OF ANY IMPLIED WARRANTIES, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, IS HEREBY LIMITED TO THE ONE YEAR DURATION OF THIS WARRANTY. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you. This warranty gives you specific legal rights, and you may have other rights which vary from state to state.
If you have any questions concerning this warranty, please write our Customer Assistance Center, Honeywell Inc., P.O. Box 524, Minneapolis, MN 55440-0524 or call 1-800-468-1502, Monday-Friday, 7:00 a.m. to 5:30 p.m., Central time. In Canada, write Retail Products ON30, Honeywell Limited/Honeywell Limitée, 155 Gordon Baker Road, North York, Ontario M2H 2C9
Home and Building Control Honeywell Inc.
Honeywell Plaza
P.O. Box 524
Minneapolis, MN 55408-0524
Home and Building Control
Honeywell Limited-Honeywell Limitée 155 Gordon Baker Road
North York, Ontario
M2H 2C9
69-1012 6-96 J.S. Printed in U.S.A.
Copyright © 1996 Honeywell Inc. All Rights Reserved ® U.S. Registered 40Trademark Printed on recycled paper containing at least 10% post-consumer paper fibers.69-1012
Printed on recycled paper containing at least 10% post-consumer paper fibers.69-1012
Reference
Download Manual:
Honeywell 3355 Programmable Thermostat User Guide