Programmable Thermostat
Low Voltage (20 to 30 Vac) Thermostat and Wallplate
Congratulations on the purchase of your new thermostat!
Over 100 years of Honeywell engineering expertise went
into the making of this thermostat in an effort to provide
you with a more comfortable and convenient living
environment.
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.
Programmable Heat and/or Cool
Model CT2700
CT2700
An Electronic Round
USER’S GUIDE
MERCURY
SWITCH
TYPICAL LOCATION OF A MERCURY
SWITCH IN A THERMOSTAT
RECYCLING
THERMOSTAT
If this thermostat is replacing a control that
contains mercury in a sealed tube, do not place
your old control in the trash. Contact your local
waste management authority for instructions
regarding recycling and the proper disposal of this
control, or of an old control containing mercury in a
sealed tube.
If you have questions, call Honeywell, Inc. at
1-800-468-1502.
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, Inc. at
1-800-468-1502.
M10614
™
®U.S. Registered Trademark
Copyright © 1997 Honeywell Inc. • • All Rights Reserved
X-XX UL
69-1085
CT2700 AN ELECTRONIC ROUND ™ PROGRAMMABLE THERMOSTAT
Table 1. Compatibility Chart
System Type Compatible With CT2700
Gas—Standing Pilot Yes
Gas—Electronic Ignition Ye s
Gas-Fired Boilers Yes
Gas—Millivolt No
Oil-Fired Boilers Yes
Oil-Fired Furnace Ye s
Electric Furnace Yes
Electric Air Conditioning Ye s
Baseboard Electric (120/240 Line Volt) No
Heat Pumps/Multistage Equipment No
Not compatible with any 120/240 volt circuit.
Not compatible with 2-wire White-Rodgers no. 1361 zone valves.
a
Not compatible with millivolt systems.
b
Compatible with 2-wire Honeywell zone valves. Isolating relay required for 3-wire thermostats zone valves
a
a,b
b
Acquire tools and items as needed. See Fig. 1.
CROSS-RECESSED
SCREWDRIVER
WIRE CUTTER/STRIPPER OR SHARP
KNIFE, IF NEEDED TO STRIP WIRES
LEVEL, IF NEEDED TO LEVEL
THERMOSTAT FOR APPEARANCE
HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED TO
DRILL HOLES IN WALL
MASKING TAPE, IF
NEEDED TO LABEL WIRES
AS DISCONNECTED FROM
OLD THERMOSTAT
M878B
Fig. 1. Required installation tools/supplies.
2 REMOVE OLD THERMOSTAT
Test to make certain that your heating and air
conditioning systems (where applicable) 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).
CAUTION
Be careful when handling wires during
installation.
Damage to heating/cooling system possible.
Disconnect power at furnace or at main breaker/
fuse box before starting operation.
Carefully unpack your new thermostat, wallplate,
and decorator cover 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, to wall and lift away.
Disconnect wires from 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 labeling. Wrap wires around a
pencil to keep them from falling back into the wall as
shown in Fig. 2.
WIRES THROUGH
WALL OPENING
M5136
Fig. 2. Wrapping wires around pencil.
Replacing Clock With C or C1
Clock Terminals
If you are replacing a Honeywell Chronotherm® Thermostat, you may find one or two wires that go to the C or C1
clock terminals on the Chronotherm®
wallplate. Do not allow them to touch, or you can damage
your transformer. Disconnect the wires and wrap them
separately using electrical tape; do not wrap them
together. Place the wires to avoid interfering with the new
thermostat operation. Record the colors and terminal
designation labels of the remaining wires.
Thermostat wiring
Six or More Wires
If there are six or more wires connected to the thermostat
(excluding clock wires attached to terminals), you probably
have a variation of a multistage heat pump or other
multistage system. The thermostat is not compatible with
such systems so return the product to your retailer. If you
would like information about which programmable
thermostats work with your system, call Honeywell
Customer Assistance Center at 1-800-468-1502.
69-1085
2
CT2700 AN ELECTRONIC ROUND ™ PROGRAMMABLE THERMOSTAT
1
1
W
Y
G
R
HEATING
RELAY AND
FAN COIL
24V
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
M12543
T8700
L1
(HOT)
L2
1
1
W
Y
G
R
FAN
COIL
COOLING
CONTACTOR
COIL
24V
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
M12544
T8700
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 will work only if you install an isolating relay on
these systems. For details, call Honeywell Customer
Assistance Center at 1-800-468-1502.
3 MOUNT WALLPLATE
IMPORTANT
Level for appearance only. The thermostat
functions normally even when not mounted level.
Position the decorator cover plate and wallplate on
the wall. Level the wallplate for appearance if
desired. Use a pencil to mark the two mounting holes that
best fit the application. See Fig. 3.
WALL
DECORATOR
COVER PLATE
WALLPLATE
E
A
H
T
F
F
O
L
O
O
C
F
A
N
O
N
A
U
T
O
PLASTIC SCREW
ANCHOR (2)
4 WIRE WALLPLATE TERMINALS
The CT2700 Thermostat is powered through the heating/
cooling system and is adaptable to most 4-wire, 18 to 30
Vac heating-cooling systems. Refer to Figs. 4 through 6 for
some typical system wiring diagrams.
T8700
R
G
Y
W
HEATING
1
L1
(HOT)
L2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
1
OVERLOAD PROTECTION AS REQUIRED.
Fig. 4. CT2700 wiring diagram,
Fig. 5. CT2700 wiring diagram,
PRIMARY
CONTROL
24V
4-wire heat/cool system.
2-wire, heat-only system.
FAN
RELAY
COOLING
CONTACTOR
M12525
Fig. 3. Mounting decorator cover plate and
Remove the decorator cover plate and wallplate
from the wall, and drill two 3/16-inch holes in the wall
(if drywall). For firmer wall material such as plaster or
wood, drill 7/32-inch holes. Gently tap provided anchors
into the drilled holes until flush with the wall.
Reposition the decorator cover plate and wallplate,
pulling wires through the wiring opening. Loosely
insert the mounting screws into the holes.
Level for appearance only; the thermostat functions
properly even when not level. Tighten the mounting
screws.
wallplate to wall.
M12532
IMPORTANT
3
Fig. 6. CT2700 wiring diagram,
3-wire, cool-only system.
Use 18-gauge maximum wire to wire the
thermostat.
69-1085
CT2700 AN ELECTRONIC ROUND ™ PROGRAMMABLE THERMOSTAT
All wiring must comply with local electrical codes and
ordinances. If unsure about household wiring procedures,
call your local heating and air conditioning contractor.
Refer to the masking tape labels you placed on wires
when you removed your old thermostat.
Match the letter of your old thermostat wire with the
terminal of the corresponding letter on your new
thermostat. Refer to Fig. 7.
ROUTE WIRING AS
SHOWN THROUGH
ENTRANCE
HOLE
F
O
L
O
O
C
T
A
E
H
F
R
G
Y
W
ALTERNATE MOUNTING
SCREW HOLE
F
A
MOUNTING
N
O
SCREW
N
A
U
T
O
HOLE
5 ADJUST FAN OPERATION SWITCH
The thermostat fan operation switch, labeled fuel switch in
Fig. 9, is set at the factory in the F (gas/oil fuel) position.
This is the correct setting for most systems. If this system
is an electric heat system, set the switch to the E (electric)
position. The E setting allows the fan to turn on immediately with the heating or cooling equipment in a system
where the G terminal is connected.
F
FUEL SWITCH
E
ALTERNATE
MOUNTING
MOUNTING
SCREW HOLE
WIRING ENTRANCE HOLE
SCREW HOLE
M12529
Fig. 7. CT2700 wallplate wiring connections.
NOTE: To ensure proper mounting of the thermostat,
restrict all wiring to the left side of the terminals.
Loosen the terminal screws and slip each wire
beneath its matching terminal. The shape of the
terminals permit insertion of straight or wraparound
connections. See Fig. 8. Tighten the terminals.
FOR WRAPAROUND, STRIP
7/16 INCHES (11 mm)
FOR STRAIGHT INSERTION,
STRIP 5/16 INCHES (8 mm)
Fig. 8. CT2700 methods for wiring connection.
Plug the hole in the wall with insulation to help
prevent drafts from adversely affecting thermostat
operation.
Fig. 9. Fuel switch, rear view of thermostat.
6 MOUNT THERMOSTAT TO
WALLPLATE
Align the tab and connector pins at the top of the
thermostat with the wallplate. See Fig. 10.
DASHED LINES
M12537
INDICATE TABS
ON BACK OF
THERMOSTAT
A
ALIGN TABS/PINS A T T OP
OF THERMOSTAT WITH
WALLPLATE CONNECTOR.
M12530
Fig. 10. Mounting thermostat to wallplate.
F
F
O
L
O
O
C
Set
M12531
T
A
F
E
A
H
N
O
N
A
U
T
O
T
A
F
E
A
H
F
F
O
L
O
O
C
PRESS THERMOSTAT CASE
B
STRAIGHT ON TO LATCH.
N
O
N
A
U
T
O
Set
69-1085
4
CT2700 AN ELECTRONIC ROUND ™ PROGRAMMABLE THERMOSTAT
AM
SET
Press the thermostat straight on to the wallplate to
latch.
NOTE: To remove the thermostat from the wallplate,
grasp the thermostat on both sides and pull the
thermostat straight out.
Restore power to the heating/cooling system.
7 PROGRAM YOUR THERMOSTAT
The thermostat is preprogrammed for your convenience
with the following time and temperature settings,
see Table 2.
Table 2. Preprogrammed Time/Temperature Settings.
Period
Start
Time
WAKE 6:00 AM 70°F (21°C) 78°F (25.5°C)
SLEEP 10:00 PM 62°F (16.5°C) 82°F (28°C)
WAKE is the time period you want the house at a comfortable temperature during the day.
SLEEP is the time period you can set for an energysavings temperature while you are sleeping.
NOTE: The heating and cooling program times are the
same. Changing your cooling WAKE time also
changes your heating WAKE time.
The following sequence uses the heating program as an
example; the System switch is in the HEAT position. To
change to the cooling program, move the System switch to
the COOL position and enter the cooling temperature
settings.
NOTE: To exit the sequence at any time, press
until End is displayed.
1. Set Current Time
a. Press .
b. Press or
to set current
time.
If you wish to change the preprogrammed time/ temperature settings, follow steps 2 through 6. If not, press the
key until End is displayed or the thermostat will
automatically return to normal operational mode within five
minutes.
2. Set WAKE Time
a. Press .
b. Press or
to set desired
WAKE time.
Heating
Setpoint
PM
AM
Cooling
Setpoint
3. Set WAKE
Temperature
a. Press .
b. Press or
to set desired
WAKE temperature.
4. Set SLEEP Time
a. Press .
b. Press or
to set desired
SLEEP time.
5. Set SLEEP
Temperature
a. Press .
b. Press or
to set desired
SLEEP temperature.
PM
SET
PM
6. Run Program
Press . End is
displayed for five
seconds indicating the
end of programming.
The thermostat then
displays the current
time and room
temperature.
PM
8 OPERATE YOUR THERMOSTAT
Display Temperature Setting
a. Press or once
to display present
temperature setting.
After approximately
five seconds, the
thermostat displays the current time and room
temperature.
Temporary Change
a. Press or until
the desired temperature is displayed.
b. TEMPORARY is
displayed.
The TEMPORARY
change is in effect
until the next program
period.
NOTE: To cancel your TEMPORARY change, press
until End is displayed.
SET
SET
TEMPORARY
AM
AM
AM
5
69-1085
CT2700 AN ELECTRONIC ROUND ™ PROGRAMMABLE THERMOSTAT
Hold Function
To hold the thermostat at one temperature indefinitely,
program both WAKE and SLEEP to the same
temperature.
9 SET FAN AND SYSTEM SWITCHES
Manually control fan and system settings using the
switches located at the top of the thermostat case. See
Fig. 11 for switch locations.
TEMPERATURE DISPLAY
T
A
E
H
F
F
O
L
O
O
C
PM
Set
DECREASE
SETTING
Fig. 11. CT2700 time/temperature display and
system/fan switches.
Fan Switch
The FAN switch settings are:
ON: The fan runs continuously. Use for improved air
circulation.
AUTO: Normal setting for most homes. In cooling,
the fan starts and stops with the cooling equipment. In heating, the fan is controlled directly by
the heating equipment and starts a few minutes
after the heating equipment turns on (on most
systems). When the thermostat fuel switch is set
to the E position for electric heat, the fan starts
and stops with the heating equipment.
Slide the switch on the thermostat to the desired fan
setting.
System Switch
The System switch settings control thermostat
operation as follows:
COOL: The thermostat controls the cooling system.
OFF: Both heating and cooling are off.
HEAT: The thermostat controls the heating system.
Slide the System switch on the thermostat to the
desired system setting.
69-1085
FAN SWITCHSYSTEM SWITCH
F
A
N
O
N
A
U
T
O
INCREASE
SETTING
M12523
10 CHECK OPERATION AFTER
INSTALLATION/PROGRAMMING
Heating System
Slide the System switch to HEAT and the Fan switch
to AUTO.
Press and hold the key to raise the temperature
several degrees above the room temperature to
start the heating equipment. When using the
thermostat with the fuel switch set to the E position
for electric heat, the fan starts immediately.
Press the key to lower the temperature setting
below the room temperature. The heating equipment
should stop.
Cooling System
CAUTION
Operating at too low of an outdoor temperature
may cause compressor damage
Damage to compressor possible.
Do not operate cooling system if outdoor temperature is below 50°F (10°C). Refer to manufacturer
recommendations.
IMPORTANT
Temporary protection delay protects compressor;
the thermostat allows the compressor to remain
off for five minutes before restarting.
Slide the System switch to COOL and the Fan
switch to AUTO.
Press the key to lower the temperature setting
several degrees below the room temperature to start
the cooling equipment.
Press the key to raise the temperature setting
above the room temperature. The cooling equipment
should shut down.
Fan
Slide the System switch to OFF and the Fan switch
to ON. The fan should run continuously.
CUSTOMIZE YOUR THERMOSTAT
The following instructions provide the information necessary to change the heating cycle rate to match your
heating equipment; choose Fahrenheit (°F) or Celsius
(°C); and 12- or 24-hour clock.
To exit at any time, press until End is displayed.
1. Enter Installer Setup
a. Slide System switch to OFF position.
b. Use the or
keys to
the temperature
setpoint to 52°F
(11°C).
6
set
SET
AM
CT2700 AN ELECTRONIC ROUND ™ PROGRAMMABLE THERMOSTAT
c. After the
thermostat
reverts back to
displaying room
temperature
(approximately five seconds), simultaneously
press and keys and hold for three
seconds. Release the keys after the display
changes.
d. Press within
five seconds.
The display
changes to
show current
cycle rate
setting.
TEMPORARY
AM
2. Cycles Per Hour
a. Use or to select 1, 3, 6, or 9 cycles per
hour (cph). Refer to Table 3.
Table 3. Heating Cycle Rates
System Program Setting (cph)
Gas or oil forced air 6
b. Press to
display the
current °F or
°C setting.
3. Fahrenheit - Celsius Temperature
a. Use or to choose between °C and °F.
b. Press to
display the
current 12- or
24-hour clock
setting.
4. Clock Format
a. Use or to choose either
hour clock format.
Press once to exit the
Installer Setup. Upon exiting,
the temperature setting will
be at 52°F (11°C). Pressing
six times returns the
thermostat to the normal
operational mode. End appears in the display.
5. Slide system switch to desired position.
Electric furnace 9
Hotwater baseboard, High
efficiency (90+) gas furnace
Steam, radiant floor heat,
gravity
3
1
TROUBLESHOOT YOUR THERMOSTAT
Symptom Possible Cause Corrective Action
Heating/cooling
equipment will not
operate
Partial display Inoperative thermostat. Replace thermostat.
No display No power to thermostat. Check power to thermostat.
Temperature display
is incorrect
Cannot change
temperature setting
No AC power to
thermostat.
Check power to heating/cooling equipment:
— On/Off switch
— Fuse or circuit breaker
— Loose 24V connection: At thermostat; at furnace/air
conditioner
— Incorrect wiring: check appropriate wiring diagram.
Thermostat inoperative. See checkout section.
System switch on
thermostat in wrong
position.
Thermostat minimum-off
times operating for
cooling.
Reset System switch.
Wait five minutes or follow steps in Checkout section.
Incorrect wiring. Check wiring.
Heating/cooling
equipment inoperative.
Still in installer setup
mode.
Thermostat mounted
incorrectly on wallplate.
Thermostat is configured
for °F or °C.
The upper or lower
temperature limits were
reached.
Consult equipment manufacturer instructions.
See Installer Setup section for exit instructions.
See installation instructions for correct mounting.
Reconfigure the display. See Installer Setup section for
instructions to change the display.
Check the temperature setpoints; temperature setting
range is 40°F (4°C) to 99°F (37°C).
7
a 12- or 24-
69-1085
CT2700 AN ELECTRONIC ROUND ™ PROGRAMMABLE THERMOSTAT
PERCENT OF HEATING
COSTS YOU CAN SAVE
SAVINGS FOR ONCE-A-DAY
10°F (5°C) DECREASE*
6TO 8%
9 TO 11%
12 TO 13%
14 TO 15%
16 TO 18%
PERCENT OF COOLING
COSTS YOU CAN SAVE
SAVINGS FOR ONCE-A-DAY
10°F (5°C) INCREASE*
7TO 9%
10 TO 11%
12 TO 14%
14 TO 19%
*
YOUR SAVINGS DEPENDS ON HOME SIZE AND
ACTUAL HEAT LOSS OR GAIN, GEOGRAPHIC
LOCATION, FREQUENCY OF TEMPERATURES
CHANGE, AND RANGE IN DEGREES OF CHANGE.
HEAT
COOL
M12545
Limited One-Year Warranty
Honeywell warrants this product 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 the 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,
(i) return it , with a bill of sale or other dated proof of purchase, to the retailer from which you purchased it, or
(ii) 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. in Canada: Honeywell, Limited/Honeywell Limitée
Return Goods Department Product Services ON15-FFE
1050 Berkshire Lane 155 Gordon Baker Road
Plymouth, MN 55441-4437 North York, Ontario M2H 3N7
This warranty does not cover removal of 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, expressed or implied, or any other failure of this product. Some states do not allow the exclusion or limitation or incidental
or consequential damages, so this limitation may not apply to you.
This warranty is the only expressed 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, Monday - Friday, 7:00 a.m. to 5:30 p.m., Central time. In Canada, write Retail Products ON15-02H,
Honeywell Limited/Honeywell Limitée, 155 Gordon Baker Road, North York, Ontario M2H 3N7.
Home and Building Control
Honeywell Inc.
Honeywell Plaza
P.O. Box 524
Minneapolis, MN 55408-0524
69-1085
69-1085 R.T. 8-97 Printed in U.S.A.
Home and Building Control
Honeywell Limited-Honeywell Limitée
155 Gordon Baker Road
North York, Ontario
M2H 3N7
8
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