Honeywell CT3355 OWNER’S GUIDE
MagicStat® /3355
Programmable Thermostat by Honeywell
OWNER’S GUIDE
Weekday/Weekend (5-day/ 2-day)
Programmable Heat and/or Cool
Low Voltage (20 to 30 Vac)
Thermostat and Mounting Plate
Model CT3355
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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.
RECYCLING THERMOSTAT
If this thermostat is replacing a thermostat 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.
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MERCURY |
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Fig. 1. Typical |
SWITCH |
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location of a |
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mercury switch in a |
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thermostat. |
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M3701 |
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Table of Contents |
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Step 1: Prepare For Installation ..................................................................................................... |
4 |
Step 2: Remove Old Thermostat ................................................................................................... |
6 |
Step 3: Install Batteries .................................................................................................................. |
8 |
Step 4: Program Thermostat ........................................................................................................ |
10 |
Personal Programming Chart ...................................................................................................... |
12 |
Step 5: Adjust Fan Operation Switch, as Required ................................................................... |
18 |
Step 6: Adjust System On-Time, °F/C°, as Required ................................................................. |
18 |
Step 7: Mount Thermostat Mounting Plate ................................................................................. |
21 |
Step 8: Wire Thermostat Terminals ............................................................................................. |
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Step 9: Mount Thermostat ............................................................................................................ |
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Step 10: Check Thermostat Operation After Programming and Installing .............................. |
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Step 11: Set Fan and System Switches ..................................................................................... |
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Troubleshooting Guide ................................................................................................................. |
32 |
Limited One-Year Warranty ................................................................................. |
Inside Back Cover |
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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 |
Yes |
Gas-Fired Boilers |
Yes |
Gas—Millivolt |
No |
Oil-Fired Boilers |
Yes |
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. |
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a, b
a, b
aCompatible 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.
bCompatible with hot water baseboard systems. Will not work efficiently on steam or gravity
systems. |
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■Acquire tools and items below as needed. Also purchase two AA alkaline batteries; we recommend Energizer® batteries.
CROSS-RECESSED SCREWDRIVER
HAND OR POWER 
DRILL WITH 3/16 INCH 
DRILL BIT, IF NEEDED TO DRILL HOLES IN WALL
WIRE CUTTER/STRIPPER OR SHARP KNIFE, IF NEEDED TO STRIP WIRES
MASKING TAPE, IF NEEDED TO LABEL WIRES AS DISCONNECTED FROM OLD THERMOSTAT
LEVEL, IF NEEDED TO LEVEL |
M878B |
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THERMOSTAT FOR APPEARANCE |
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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.
WIRES THROUGH
WALL OPENING
M5136
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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.
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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; nonalkaline 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.
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REMOVING |
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BATTERY |
M1719C |
DOOR |
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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
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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.
INSTALL TWO AA ALKALINE
BATTERIES AS SHOWN
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.
M1713 |
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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 temperature settings for various times of the day.
Four time periods are available during weekdays — 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 temperature 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,
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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 requirements 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.
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Personal Programming Chart
Heating Program
2
Weekdays |
Start Time |
Heating Temperature |
WAKE 1
LEAVE
RETURN 1
SLEEP
Weekends
WAKE 1
SLEEP
1WAKE 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.
2The temperatures cannot be set any higher than 88°F (31°C) or any lower than 45°F (7°C).
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