Honeywell MagicStat CT3300 Technical specifications

MagicStat®CT3300 Programmable Thermostat
Installation and Programming Instructions
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.
If you have any questions about using this thermostat,
visit our home expert Web site at
www.honeywell.com/yourhome or call Honeywell
Customer Relations at 1-800-468-1502.
®U.S. Registered Trademark
Copyright © 2001 Honeywell • All Rights Reserved
Weekday/Weekend (5-day/2-day)
Programmable Heat and/or Cool
Low Voltage (20 to 30 Vac)
Thermostat and Mounting Plate
Model CT3300
Table of Contents
Installation 2
Programming 11
Operation 17
Change the clock for Daylight/
Standard Time
17
Set the Fan and System switches 17
Replace the batteries 18
Override the program settings 19
Frequently asked questions 22
Limited 1-Year Warranty 24
69- 0654- 5

2INSTALLATION 69-0654-5
Installation
Verify that you have the right thermostat
Make sure that the CT3300 is the right thermostat for your heating/cooling system. Read the compatibility chart below to
determine which system you have. If your system is not compatible with the CT3300, the table recommends an alternate
Honeywell model. If you are unsure what type of thermostat is right for your system, visit us on the Web at
www.honeywell.com/yourhome or call Honeywell Customer Relations at 1-800-468-1502.
Heating/cooling system
Compatible
with CT3300?
Alternate
model
Conventional
Single stage systems that include warm air furnaces and hot water.
Yes
Electric Baseboard
Electric powered heating strips located just above the floor, usually 120 to 240 volts.
No CT1950 for
240 volts
Steam
A steam boiler with radiator heat.
No CT3600
Heat Pump
Heating and cooling are produced from the same outdoor unit (compressor) with no
auxiliary or backup heat.
No CT3600
Multistage Heat Pump
Heating and cooling are produced from the same outdoor unit (compressor) with
auxiliary or backup heat.
No CT3611
Multistage Conventional
A heating or cooling system with more than one stage.
No See your
contractor
Recycling thermostat
If you are removing an old thermostat that contains mercury in a
sealed tube (Fig. 1), do not place the old thermostat in the trash.
Contact your local waste management authority for instructions
regarding recycling and the proper disposal of the old thermostat.
Fig. 1
M3701
MERCURY
SWITCH

69-0654-5 INSTALLATION 3
Step 1. Prepare for installation
a. Carefully unpack your new thermostat. Save your receipt and make sure you have the following parts:
b. Gather the needed tools and supplies listed below.
c. Make sure that your heating and cooling systems are working properly. If there is a problem with either system, call a
heating/air conditioning contractor—the problem may persist after you install the new thermostat.
Required tools and supplies Optional tools
• Two AA alkaline batteries. Honeywell recommends
Energizer® batteries.
• Screwdriver
• Hand or power drill with 3/16-inch or 7/32-inch drill bit
•Pencil
• Wire cutter/stripper or sharp knife
•Level
• Electrical tape
IMPORTANT: To avoid damaging the compressor in the air conditioner, do not operate the cooling system when the
temperature outdoors is below 50°F (10°C).
• Thermostat and mounting plate
• Labels
• Screws and anchors
• Installation and Programming Instructions

4INSTALLATION 69-0654-5
Step 2. Remove the old thermostat
Fig. 2
Fig. 3
Fig. 4
a. Turn off power to the heating/cooling system, either at the
furnace or at the fuse/circuit breaker panel.
b. Remove the cover of your old thermostat (Fig. 2).
c. Unscrew and remove the old thermostat’s mounting plate from
the wall, but do not disconnect the wires.
d. Inspect the old thermostat wiring. If the wiring meets any of
the following conditions, see the special wiring
instructions on page 9.
• The old thermostat is a clock thermostat with wires attached
to the C or C1 terminals.
• The old thermostat has 6 or more wires, excluding wires
attached to C or C1 terminals.
• The old thermostat has 3 wires.
• There are 5 wires connected to the old thermostat.
• There are extra wires that are not connected to the old
thermostat.
e. Using the enclosed labels, mark the wires with the letter of the
terminal that it is attached to on the old thermostat (Fig. 3). Do
not label the wires by color.
If the labels do not match the letters on the old thermostat
terminals, see the wiring cross reference table on page 10.
f. Disconnect the wires from the old thermostat and wrap the
wires around a pencil to keep them from falling back into the
wall.
Note: Remember, if your old thermostat contains mercury, you
must recycle it. See page 2 for more recycling information.
✓ Check
y
our
p
ro
g
ress
Your wall should now look like Fig. 4.
M20140
M19086
WIRES THROUGH
WALL OPENING
M20133

69-0654-5 INSTALLATION 5
Step 3. Install the mounting plate
Fig. 5
Fig. 6
Fig. 7
a. Separate the mounting plate from the thermostat using a coin,
as shown in Fig 5.
b. Position the mounting plate on the wall. Be sure the mounting
plate sits flush against the wall and none of the wires are
trapped behind it.
c. Level the mounting plate and use a pencil to mark the center of
the mounting plate’s screw holes.
d. Remove the mounting plate and drill holes at the locations you
marked.
• For drywall, drill two 3/16 inch holes.
• For plaster or wood, drill two 7/32 inch holes.
e. If installing in drywall, gently tap the anchors that were provided
into the drilled holes until they are flush with the wall.
f. Reposition the mounting plate over the holes, pull the wires
through the wiring opening, and loosely insert the mounting
screws into each of the drilled holes or anchors (Fig. 6).
g. Make sure the mounting plate is level and tighten the mounting
screws.
✓ Check your progress
The mounting plate is now mounted on the wall and should look like
Fig. 7.
M20139
M20129
M20128
W
R
G
R
c
Y

6INSTALLATION 69-0654-5
Step 4. Set the thermostat for your type of heating system
a. Use the FUEL SWITCH on the back of the thermostat to set
your new thermostat for the type of fuel that your heating
system uses: F–gas or oil, or E–electricity.
Note: This setting enables proper fan operation.
b. Use the A and B screws on the back of the thermostat to set
your new thermostat for your type of heating system. See the
heating system table on the next page to find the correct
settings.
Note: These screws are factory-set for a warm air, gas, or oil
heating system.
c. The thermostat is set to display the temperature in degrees
Fahrenheit (°F
)
. If you want to display the temperature in
degrees Celsius (°C
)
, adjust screw C out one turn.
d. You can install the batteries and program your thermostat now,
or you can wait until the thermostat is mounted on the wall. To
install the batteries, see the instructions on page 8. To program
the thermostat, see the instructions that begin on page 12.
IMPORTANT: Setting your thermostat correctly for your type of
heating system allows it to maintain accurate temperature control,
minimize swings in the temperature of the room, and efficiently run
the fan.
Fig. 8
RRc
W Y G
B D
A C
THERMOSTAT BACK
M20145
DISPLAY F
DISPLAY C C–IN C–OUT
1 TURN
FOR HIGH EFFICIENCY FURNACE (90%+ AFUE)
ADJUST: SCREW A–OUT ONE TURN
SCREW B–IN
FUEL SWITCH – F POSITION
FE
FUEL SWITCH
WARM AIR
FURNACE
HOT WATER
BOILER
ELECTRIC
FURNACE
A–IN
A–OUT
1 TURN
A–IN
ADJUST SCREWS THROUGH HOLES
TO SELECT OPERATION DESIRED
B–IN
B–IN
B–OUT
1 TURN
FUEL SWITCH
POSITION
F
F
E
HEATING SYSTEM
FUEL SWITCH
HEATING
SYSTEM TYPE
SELECTING ºF OR ºC

69-0654-5 INSTALLATION 7
Heating system table
Note: Setting the screw “out one turn” means turning the screw 360° counter-clockwise, or one complete turn.
Step 5. Wire the thermostat terminals
Type of system Screws A and B Fuel switch
Warm air, gas, or oil heating system with an efficiency rating under 90%.
(The furnace efficiency rating should be on the furnace.)
Use factory setting
A–leave in
B–leave in
F
High-efficiency furnace such as a 90% or greater AFUE (Average Fuel
Utilization Efficiency) unit
A–out one turn
B–leave in
F
Hot water boiler A–out one turn
B–leave in
F
Electric furnace A–leave in
B–out one turn
E
Fig. 9
Fig. 10
a. Hold the thermostat as shown in Fig. 9.
b. Using the labels on the wires, match the letter of your old
thermostat wire with the corresponding terminal on the back of
your new thermostat.
Note: If the letters on the old thermostat terminals do not match
the letters on the new thermostat terminals, you might not need
to connect all of the old wires to the new thermostat. See the
wiring cross reference table on page 10 for details.
c. Loosen the terminal screws and slip each wire beneath its
matching terminal (Fig 10).
d. Securely tighten the terminals.
W
Y
G
R
M20125
INSERT
STRAIGHT
UNDER
SCREW HEAD
5/16 in.
(8 mm)
STRIP
END OF WIRE
VISIBLE HERE
M20126

8INSTALLATION 69-0654-5
Step 6. Mount the thermostat
Step 7. Install the batteries
a. Align the tabs at the top of the thermostat with the tabs at the
top of the mounting plate (Fig. 11).
b. Press the lower edge of the case to latch the bottom of the
thermostat (Fig. 12).
Fig. 11 Fig. 12
M20130
M20131
Fig. 13
Fig. 14
a. Make sure that the System switch is set in the OFF position.
b. Using a coin, open the battery door as shown in Fig. 13.
c. Install the batteries.
Make sure that the positive and negative terminals are oriented
correctly as marked inside the battery case.
d. Replace the battery door.
e. Remove the clear plastic label from the digital display.
✓Check
y
our
p
ro
g
ress
When the batteries are installed correctly, the digital display flashes
all entries once, then begins to flash a default time and the current
temperature (Fig. 14). The flashing continues until you begin to
program the thermostat.
You are now ready to program the thermostat. Go to page 12.
IMPORTANT: Batteries must be installed for programming and
operation of the thermostat and heating/cooling system.
Honeywell recommends using Energizer® batteries.
M1719C
REMOVING
BATTERY
DOOR

69-0654-5 INSTALLATION 9
Special wiring instructions
A clock thermostat with C or C1 terminals
A clock thermostat has one or two extra wires attached to the C or C1 terminals that allow the clock to operate. These
wires are not used during the installation of your new 3300 thermostat and must be insulated from each other to avoid
damaging your electrical circuit.
a. Make sure that power to the heating/cooling system is turned off.
b. Locate the wires that are connected to the clock terminals marked C or C1.
c. As you disconnect the wires, do not allow these wires to touch.
d. Wrap the wires separately, using electrical tape to insulate the wires.
e. Place the wires where they will not interfere with the operation of the new thermostat.
You will not connect these wires to your 3300 thermostat.
f. Continue with the installation as instructed on page 4 at step 2e.
Six or more wires
If your old thermostat has six or more wires (excluding clock wires attached to the C or C1 terminals), your heating/cooling
system is most likely a variation of a heat pump or multistage system. Your 3300 thermostat will NOT work with such
systems and should be returned to the place of purchase. See the compatibility table on page 2 for information about which
programmable thermostat WILL work with your system.
Three thermostat wires
If you have three wires for heating only and can operate the fan using the old thermostat’s fan switch, the 3300 thermostat
will work with your system. Continue the installation procedure on page 4, step 2e.
If you have a three-wire heating-only system and cannot operate the fan using the old thermostat’s fan switch, the 3300
thermostat will probably NOT work with your system. Contact your heating contractor for installation assistance.
Wires that are not connected to the old thermostat
If there are extra wires that do not connect to your old thermostat, do not label them. You will not connect these wires to
your new thermostat. Tape off the wires with electrical tape and place them where they will not interfere with the operation
of the new thermostat. Continue the installation procedure on page 4, step 2e.

10 INSTALLATION 69-0654-5
M20127
JUMPER (FACTORY-
INSTALLED). REMOVE
IF 5-WIRE SYSTEM
RRc
WY G
Five wires connected to the old thermostat
Your new thermostat has a factory-installed metal jumper between the R and Rc terminals (Fig. 15). Remove the jumper
before wiring the R and Rc terminals.
Fig. 15
Old thermostat terminals that do not match new thermostat terminals
Use the table below to wire the new thermostat.
*Remove factory-installed jumper between R and Rc terminals in 5-wire systems.
Old thermostat
terminal
Connect to new
thermostat terminal Description
R, RH, 4, V R* Power
Rc, R Rc* Power for cooling
W, W1, H W Heat
Y, Y 1, M Y Cooling
G, F G Fan
O Do not continue
installation
Changeover in cool (O terminal) or changeover in heat (B terminal).
You have a single stage heat pump or zoning system. See page 2 for an
alternate thermostat model.
B
C, X, B Do not connect Transformer common.
W2, H2Do not continue
installation.
Second stage heat (W2, H2) or second stage cooling (Y2).
You have a multistage heating/cooling system. See page 2 for an alternate
thermostat model.
Y2

69-0654-5 PROGRAMMING 11
Programming
Faceplate illustration and descriptions
Descriptions, continued
5 Clear–Cancels the currently displayed program (page
20) and clears the usage counter (page 21).
6 Time Ahead and Back–Sets the time ahead and back
(page 12).
7 Program periods–Current program period or period
being programmed (page 13).
8 Day–Current day or day being programmed.
9 Time–Current time or program time.
10 Temperature–Room or programmed temperature.
11 HEAT/COOL–Indicates if the heating schedule or the
cooling schedule is running or being programmed.
12 TEMPORARY–Displays when a temporary override is
made to the program (page 19).
13 Temp Warmer and Cooler–Raises or lowers the
temperature (page 14).
14 Usage–Displays how long the heating/cooling system
has been running (page 21).
15 Run Program–Returns thermostat to operating mode.
16 Hold Temp–Holds a selected temperature (page 19).
17 Present Setting–Displays the temperature setting for
the current program period (page 20).
18 System switch–Selects Cool, Off, Heat (page 18).
19 Arrow buttons–Allow you to temporarily change the
temperature without opening the faceplate door (page
19).
Descriptions
1 Fan switch–Selects automatic or continuous fan
operation (page 17).
2 Weekend Schedule–Initiates programming of the
weekend heating or cooling schedule (page 15).
3 Weekday Schedule–Initiates programming of the
weekday heating or cooling schedule (page 14).
4 Set Clock/Day–Sets the clock and day (page 12).
Fan
Auto On System Cool Off Heat
Weekday
Schedule
Set
Clock/Day
BackBack
AheadAhead
CoolerCooler
WarmerWarmer
Hold
Temp
Weekend
Schedule Clear Usage Present Setting
Run
Program
TEMPORARY
TempTime
AM
PM
MO TU WE TH FR SA SU
WAKE LEAVE RETURN SLEEP SET
COOL
HEAT
M2016
1
1
3
4
6
7
8
18
16
15
13
12
11
9 10
19
CT3300 WITH
DOOR CLOSED
17
2
5 14
Fig. 16

12 PROGRAMMING 69-0654-5
a. Press once.
The time is displayed (Fig. 17).
b. Press and hold or until the current time is
displayed.
c. Press again.
The day is displayed (Fig. 18).
d. Press and hold or until the current day is
displayed.
e. Press once.
The current time and day and the current temperature are
displayed (Fig. 19).
Fig. 17
Fig. 18
Fig. 19
Step 1. Set the current time and day
Step 2. Learn about the programming features
Your CT3300 thermostat allows you to program schedules for both a heating season and a cooling season.
• During the heating season, you will want to set the normal room temperature higher and the energy-saving
temperature lower.
• The reverse is true during the cooling season—the normal room temperature will be lower and the energy-saving
temperature higher.
For each season, you can set up to four program periods for the weekdays (Monday–Friday), and up to two program
periods for the weekends (Saturday and Sunday). The program periods are defined on the next page.

69-0654-5 PROGRAMMING 13
Programming tips
• You do not need to program times and temperatures for all program periods.
If you decide not to program your thermostat, it will automatically control heating at 68°F (20°C) and cooling at 78°F
(26°C), 24 hours a day.
If you decide not to program weekend schedules, the temperature that is programmed for the weekday SLEEP
schedule will remain in effect until the next program period, which begins on Monday morning.
• The temperatures cannot be set any higher than 88°F (31°C) or any lower than 45°F (7°C).
• When pressing the buttons, use the ball of your finger or a soft pencil eraser. Use of sharp fingernails or pencil points
can damage the keypad.
• If you make an error at any time during programming, press . Then press or until you reach
the program period where you left off.
Program period Description When available
WAKE The time when you get up and get ready to leave your home.
You can set the system at a comfortable temperature for this
period.
Weekdays and weekend
LEAVE The time when you are regularly away from home. You can set
an energy-saving temperature for this period.
Weekdays only
RETURN The time between returning home and going to bed. You can
set the system at a comfortable temperature for this period.
Weekdays only
SLEEP The time when you are sleeping. You can set an energy-saving
temperature for this period.
Weekdays and weekend

14 PROGRAMMING 69-0654-5
Step 3. Program the heating schedule
a. Write in the times and temperatures that you want to program for your heating schedule.
Heating
Schedule
Program
period WAKE LEAVE RETURN SLEEP
Suggested
Settings
Time 6:00 AM 8:00 AM 6:00 PM 10:00 PM
Temp 70°F (21°C) 62°F (16.5°C) 70°F (21°C) 62°F (16.5°C)
Weekday
(Mon–Fri)
Time
Temp
Weekend
(Sat–Sun)
Time
Temp
b. Set the System switch to HEAT.
c. Press once.
A blank schedule is displayed (Fig. 20).
d. Set the Monday–Friday WAKE time by pressing or
until the desired time is displayed (Fig. 21).
e. Set the Monday–Friday WAKE temperature by pressing
or until the desired temperature is displayed.
f. Press to display a blank schedule for the next program
period (Fig. 22) and repeat steps d. through f. for each weekday
program period.
Fig. 20
Fig. 21
Fig. 22

69-0654-5 PROGRAMMING 15
Step 4. Program the cooling schedule
a. Write in the times and temperatures that you want to program for your cooling schedule.
Cooling
Schedule
Program
period WAKE LEAVE RETURN SLEEP
Suggested
Settings
Time 6:00 AM 8:00 AM 6:00 PM 10:00 PM
Temp 78°F (25.5°C) 85°F (29.5°C) 78°F (25.5°C) 82°F (28°C)
Weekday
(Mon–Fri)
Time
Temp
Weekend
(Sat–Sun)
Time
Temp
g. Press until the weekend schedule is displayed (Fig.
23).
h. Set the Saturday and Sunday WAKE time by pressing
or until the desired time is displayed.
i. Set the Saturday and Sunday WAKE temperature by pressing
or until the desired temperature is displayed
(Fig. 24).
j. Press again to display a blank schedule for the SLEEP
program period and repeat steps h. through j. to set the
program.
Fig. 23
Fig. 24

16 PROGRAMMING 69-0654-5
b. Set the System switch to COOL.
c. Repeat steps 3c. through 3k. to program the weekday and weekend cooling schedule.
Step 5. Check out the system
Verify that your heating system works
a. Set the System switch to HEAT and the Fan switch to AUTO.
b. Press until the setting is 10°F (6°C
)
above room
tem
p
erature
(
Fi
g
. 25
)
.
Your heating system should start and the fan should run after a
short delay.
c. Press until the settin
g
is 10°F (6°C
)
below room
tem
p
erature.
Your heating system should shut off.
Verify that your cooling system works
d. Set the System switch to COOL and the Fan switch to AUTO.
e. Press until the settin
g
is 10°F (6°C
)
below room
tem
p
erature
(
Fi
g
. 26
)
.
Your cooling system and fan should start.
Note: When the cooling setting is changed, the thermostat may
delay up to 5 minutes before turning on the air conditioner. This
delay protects the compressor.
Fig. 25
Fig. 26
IMPORTANT: To avoid damaging the compressor in the air
conditioner, do not operate the cooling system when the
temperature outdoors is below 50°F (10°C).

69-0654-5 OPERATION 17
Operation
Change the clock for Daylight/Standard Time
a. Press once.
The time is displayed.
b. Press and hold or until the correct time is displayed.
c. Press once.
The current time and day and the current temperature are displayed.
Set the Fan and System switches
The switches on the bottom of the thermostat faceplate (Fig. 16 page 11) control the operation of your fan and the heating
and cooling system. Set the Fan switch first and then set the System switch.
Switch Setting Result
Fan Auto 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.
Auto is the normal setting for most homes.
On The fan runs continuously. Use this setting for improved air circulation during special occasions
or for more efficient air cleaning.
Note: In a heat-only system, the fan runs continuously only if the fan wire has been connected to
the G terminal on the back of the thermostat.
f. Press until the setting is 10°F (6°C
)
above room
tem
p
erature.
Your cooling system and fan should stop.
g. Set the System switch to OFF and the Fan switch to AUTO.
The cooling system and fan should be off.

18 OPERATION 69-0654-5
Replace the batteries
As the batteries run low, your thermostat shows the following in the digital display:
a. Make sure that the System switch is set in the OFF position.
b. Open the battery door.
c. Press on the left side of the batteries to remove them.
d. Install the new batteries.
Make sure that the positive and negative terminals are oriented correctly as marked inside the battery case.
Note: If you insert the new batteries within 20–30 seconds of removing the old ones, you will not have to reprogram
the thermostat. However, if the display is blank, the batteries are dead or incorrectly installed and you will have to
reprogram. See page 12 to begin reprogramming.
e. Close the battery door and set the System switch to HEAT or COOL.
Note: If “bAt Lo” continues to display after replacing the batteries, set the System switch to OFF, insert the batteries
backwards, wait for five to ten seconds, and return the batteries to their correct orientation. Then see page 12 to begin
reprogramming.
System 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.
If you see: Batteries are: You should:
Flashing “bAt Lo” Low Replace the batteries as soon as possible, within the month.
Steady “bAt Lo” Almost dead Replace the batteries immediately. Your heating/cooling system is not operating.
Blank display Dead Replace the batteries immediately. Your heating/cooling system is not operating.
Switch Setting Result
IMPORTANT: Replace the batteries once a year to prevent the heating/cooling system from shutting down due to lack of
battery power in the thermostat. If you are leaving home for longer than a month, change the batteries before leaving to
prevent the system from shutting down due to lack of power.

69-0654-5 OPERATION 19
Override the program settings
Note: Make sure the System switch is set to either HEAT or COOL
before making any changes to the schedule.
Change the temperature temporarily
Press or until the desired temperature is displayed.
The TEMPORARY indicator is displayed indicating that the change
is temporary (Fig. 27).
Note: A temporary change to the temperature lasts for the current
program period only. The heating/cooling schedule that you
programmed resumes when the next scheduled program period is
reached. To cancel the temporary change before the next
scheduled program period, press .
Hold a temperature indefinitely
Use the Hold Temp feature when you want to maintain a constant
temperature indefinitely, such as when you go on vacation.
a. Press .
“HLd” is displayed (Fig. 28).
b. Press or until the desired temperature is
displayed.
The display shows the SET temperature for a few seconds and
then resumes reading the current room temperature.
Note: To cancel the hold, press .
Fig. 27
Fig. 28

20 OPERATION 69-0654-5
Check the current programmed temperature
Press to display the temperature that is programmed for the
current program period. The SET indicator displays briefly along with
the programmed temperature (Fig. 29). The display then returns to
the room temperature.
Check programs
Press repeatedly to display the times and temperatures that
you programmed for the weekdays (Monday–Friday).
Press repeatedly to display the programmed times and
temperatures for the weekend (Saturday and Sunday).
Press to resume the program.
Cancel a program
a. Press or until the desired program is displayed
(Fig 30).
b. Press .
A blank program schedule is displayed and the program is
canceled (Fig. 31).
Fig. 29
Fig. 30
Fig. 31