CT2700
™
An Electronic Round
Programmable Thermostat
USER’S GUIDE
MERCURY
SWITCH
TYPICAL LOCATION OF A MERCURY
SWITCH IN A THERMOSTAT
M10614
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.
Programmable Heat and/or Cool
Low Voltage (20 to 30 Vac) Thermostat and Wallplate
Model CT2700
1
PREPARE FOR INSTALLATION
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.
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.
Your new thermostat will automatically control the tem-
perature 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.
®U.S. Registered Trademark
69-1085
Copyright © 1997 Honeywell Inc. •
•
All Rights Reserved
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CT2700 AN ELECTRONIC ROUND™ PROGRAMMABLE THERMOSTAT
Three Thermostat Wires
4
WIRE WALLPLATE TERMINALS
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.
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
COOLING
CONTACTOR
Y
W
3
MOUNT WALLPLATE
FAN
RELAY
HEATING
PRIMARY
IMPORTANT
Level for appearance only. The thermostat
1
CONTROL
L1
functions normally even when not mounted level.
(HOT)
24V
L2
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.
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
1
OVERLOAD PROTECTION AS REQUIRED.
M12525
Fig. 4. CT2700 wiring diagram,
4-wire heat/cool system.
WALL
T8700
R
G
Y
DECORATOR
PLASTIC SCREW
COVER PLATE
ANCHOR (2)
W
HEATING
RELAY AND
FAN COIL
1
WALLPLATE
24V
H
E
A
T
F
F
O
L
O
O
C
F
A
N
O
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
M12543
1
N
O
Fig. 5. CT2700 wiring diagram,
2-wire, heat-only system.
T8700
R
M12532
G
Y
Fig. 3. Mounting decorator cover plate and
wallplate to wall.
FAN
COIL
W
COOLING
CONTACTOR
COIL
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.
1
L1
(HOT)
24V
L2
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
M12544
1
Reposition the decorator cover plate and wallplate,
pulling wires through the wiring opening. Loosely
insert the mounting screws into the holes.
Fig. 6. CT2700 wiring diagram,
3-wire, cool-only system.
Level for appearance only; the thermostat functions
properly even when not level. Tighten the mounting
screws.
IMPORTANT
Use 18-gauge maximum wire to wire the
thermostat.
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3
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.
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 immedi-
ately with the heating or cooling equipment in a system
where the G terminal is connected.
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.
FUEL SWITCH
ROUTE WIRING AS
SHOWN THROUGH
ENTRANCE
ALTERNATE MOUNTING
SCREW HOLE
HOLE
MOUNTING
SCREW
HOLE
E
F
R
G
Y
W
M12531
ALTERNATE
MOUNTING
SCREW HOLE
Fig. 9. Fuel switch, rear view of thermostat.
MOUNTING
SCREW HOLE
M12529
WIRING ENTRANCE HOLE
Fig. 7. CT2700 wallplate wiring connections.
6
MOUNT THERMOSTAT TO
WALLPLATE
NOTE: To ensure proper mounting of the thermostat,
restrict all wiring to the left side of the terminals.
Align the tab and connector pins at the top of the
thermostat with the wallplate. See Fig. 10.
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.
DASHED LINES
INDICATE TABS
ON BACK OF
THERMOSTAT
Set
FOR WRAPAROUND, STRIP
7/16 INCHES (11 mm)
A ALIGN TABS/PINS AT TOP
OF THERMOSTAT WITH
WALLPLATE CONNECTOR.
FOR STRAIGHT INSERTION,
STRIP 5/16 INCHES (8 mm)
M12537
Fig. 8. CT2700 methods for wiring connection.
PRESS THERMOSTAT CASE
STRAIGHT ON TO LATCH.
B
Plug the hole in the wall with insulation to help
prevent drafts from adversely affecting thermostat
operation.
M12530
Fig. 10. Mounting thermostat to wallplate.
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4
CT2700 AN ELECTRONIC ROUND™ PROGRAMMABLE THERMOSTAT
Press the thermostat straight on to the wallplate to
latch.
3. Set WAKE
Temperature
SET
AM
a. Press
b. Press
.
NOTE: To remove the thermostat from the wallplate,
grasp the thermostat on both sides and pull the
thermostat straight out.
or
to set desired
WAKE temperature.
4. Set SLEEP Time
Restore power to the heating/cooling system.
a. Press
.
PM
b. Press
or
to set desired
SLEEP time.
7
PROGRAM YOUR THERMOSTAT
The thermostat is preprogrammed for your convenience
with the following time and temperature settings,
see Table 2.
5. Set SLEEP
SET
Temperature
a. Press
b. Press
PM
.
Table 2. Preprogrammed Time/Temperature Settings.
or
to set desired
SLEEP temperature.
Start
Time
Heating
Setpoint
Cooling
Setpoint
Period
6. Run Program
Press . End is
WAKE
6:00 AM
70°F (21°C)
78°F (25.5°C)
82°F (28°C)
SLEEP 10:00 PM 62°F (16.5°C)
displayed for five
seconds indicating the
end of programming.
The thermostat then
displays the current
time and room
WAKE is the time period you want the house at a comfort-
able temperature during the day.
PM
SLEEP is the time period you can set for an energy-
savings temperature while you are sleeping.
temperature.
NOTE: The heating and cooling program times are the
same. Changing your cooling WAKE time also
changes your heating WAKE time.
8
OPERATE YOUR THERMOSTAT
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.
Display Temperature Setting
a. Press
or
once
SET
to display present
temperature setting.
After approximately
five seconds, the
AM
NOTE: To exit the sequence at any time, press
until End is displayed.
thermostat displays the current time and room
temperature.
1. Set Current Time
a. Press
.
Temporary Change
PM
b. Press
or
to set current
time.
a. Press
the desired tempera-
ture is displayed.
or
until
SET
AM
If you wish to change the preprogrammed time/ tempera-
ture 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.
b. TEMPORARY is
displayed.
The TEMPORARY
change is in effect
until the next program
period.
TEMPORARY
AM
2. Set WAKE Time
a. Press
b. Press
.
AM
or
NOTE: To cancel your TEMPORARY change, press
until End is displayed.
to set desired
WAKE time.
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5
CT2700 AN ELECTRONIC ROUND™ PROGRAMMABLE THERMOSTAT
Hold Function
10
CHECK OPERATION AFTER
INSTALLATION/PROGRAMMING
To hold the thermostat at one temperature indefinitely,
program both WAKE and SLEEP to the same
temperature.
Heating System
Slide the System switch to HEAT and the Fan switch
to AUTO.
9
SET FAN AND SYSTEM SWITCHES
Press and hold the
key to raise the temperature
Manually control fan and system settings using the
switches located at the top of the thermostat case. See
Fig. 11 for switch locations.
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.
SYSTEM SWITCH
TEMPERATURE DISPLAY
FAN SWITCH
Press the
below the room temperature. The heating equipment
should stop.
key to lower the temperature setting
L
Cooling System
CAUTION
PM
Operating at too low of an outdoor temperature
may cause compressor damage
Damage to compressor possible.
Do not operate cooling system if outdoor tempera-
ture is below 50°F (10°C). Refer to manufacturer
recommendations.
Set
IMPORTANT
Temporary protection delay protects compressor;
the thermostat allows the compressor to remain
off for five minutes before restarting.
DECREASE
SETTING
INCREASE
SETTING
M12523
Slide the System switch to COOL and the Fan
switch to AUTO.
Fig. 11. CT2700 time/temperature display and
system/fan switches.
Press the
key to lower the temperature setting
several degrees below the room temperature to start
the cooling equipment.
Fan Switch
Press the
above the room temperature. The cooling equipment
should shut down.
key to raise the temperature setting
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 equip-
ment. 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.
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 neces-
sary to change the heating cycle rate to match your
heating equipment; choose Fahrenheit (°F) or Celsius
(°C); and 12- or 24-hour clock.
Slide the switch on the thermostat to the desired fan
setting.
System Switch
To exit at any time, press
until End is displayed.
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.
1. Enter Installer Setup
a. Slide System switch to OFF position.
b. Use the or
SET
keys to set
the temperature
setpoint to 52°F
(11°C).
AM
Slide the System switch on the thermostat to the
desired system setting.
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6
CT2700 AN ELECTRONIC ROUND™ PROGRAMMABLE THERMOSTAT
c. After the
thermostat
b. Press
to
TEMPORARY
AM
display the
current °F or
°C setting.
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.
3. Fahrenheit - Celsius Temperature
a. Use
or
to
to choose between °C and °F.
b. Press
display the
current 12- or
24-hour clock
setting.
d. Press
within
five seconds.
The display
changes to
show current
cycle rate
setting.
4. Clock Format
a. Use
or
to choose either a 12- or 24-
hour clock format.
Press
once to exit the
2. Cycles Per Hour
Installer Setup. Upon exiting,
the temperature setting will
be at 52°F (11°C). Pressing
six times returns the
a. Use
or
to select 1, 3, 6, or 9 cycles per
hour (cph). Refer to Table 3.
Table 3. Heating Cycle Rates
thermostat to the normal
operational mode. End appears in the display.
System
Gas or oil forced air
Electric furnace
Program Setting (cph)
6
9
3
5. Slide system switch to desired position.
Hotwater baseboard, High
efficiency (90+) gas furnace
Steam, radiant floor heat,
gravity
1
TROUBLESHOOT YOUR THERMOSTAT
Symptom
Possible Cause
Corrective Action
Heating/cooling
equipment will not
operate
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.
Reset System switch.
System switch on
thermostat in wrong
position.
Thermostat minimum-off Wait five minutes or follow steps in Checkout section.
times operating for
cooling.
Incorrect wiring.
Check wiring.
Heating/cooling
Consult equipment manufacturer instructions.
equipment inoperative.
Partial display
No display
Inoperative thermostat.
Replace thermostat.
Still in installer setup
mode.
See Installer Setup section for exit instructions.
No power to thermostat.
Check power to thermostat.
Thermostat mounted
See installation instructions for correct mounting.
incorrectly on wallplate.
Temperature display
is incorrect
Thermostat is configured Reconfigure the display. See Installer Setup section for
for °F or °C.
instructions to change the display.
Cannot change
temperature setting
The upper or lower
temperature limits were
reached.
Check the temperature setpoints; temperature setting
range is 40°F (4°C) to 99°F (37°C).
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7
CT2700 AN ELECTRONIC ROUND™ PROGRAMMABLE THERMOSTAT
PERCENT OF HEATING
COSTSYOU CAN SAVE
SAVINGS FOR ONCE-A-DAY
10°F (5°C) DECREASE*
HEAT
6
9
TO
8%
TO 11%
12 TO 13%
14 TO 15%
16 TO 18%
PERCENT OF COOLING
COSTSYOU CAN SAVE
SAVINGS FOR ONCE-A-DAY
10°F (5°C) INCREASE*
COOL
7
TO
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.
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
Product Services ON15-FFE
155 Gordon Baker Road
Return Goods Department
1050 Berkshire Lane
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
Helping You Control Your World®
Home and Building Control
Honeywell Limited-Honeywell Limitée
155 Gordon Baker Road
North York, Ontario
P.O. Box 524
Minneapolis, MN 55408-0524
M2H 3N7
69-1085 R.T. 8-97 Printed in U.S.A.
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